MAX2820AETM-MAX2820AETM+-MAX2820AETM+T-MAX2820ETM-MAX2820ETM+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX2820ETM ,2.4GHz 802.11b Zero-IF TransceiversELECTRICAL CHARACTERISTICS(MAX2820/MAX2821 EV kit: V = +2.7V to +3.6V, RF_GAIN = V , 0V ≤ V ≤ +2.0V ..
MAX2820ETM+T ,2.4GHz 802.11b Zero-IF Transceiversapplications. Thebaseband filtering and Rx and Tx signal paths support♦ +2dBm Transmit Power (11Mbp ..
MAX2820ETM+TD ,2.4GHz 802.11b Zero-IF TransceiversELECTRICAL CHARACTERISTICS(MAX2820/MAX2821 EV kit: V = +2.7V to +3.6V, RF_GAIN = V , 0V ≤ V ≤ +2.0V ..
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MAX2830ETM+T ,2.4GHz to 2.5GHz 802.11g/b RF Transceiver with PA and Rx/Tx/Diversity Switchapplications. The MAX2830 completely integrates11Mbps CCK) all circuitry required to implement the ..
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MAX6102EUR-T ,Low-Cost / Micropower / Low-Dropout / High-Output-Current / SOT23 Voltage References
MAX6103EUR+T ,Low-Cost, Micropower, Low-Dropout, High-Output-Current, SOT23 Voltage References
MAX6103EUR-T ,Low-Cost / Micropower / Low-Dropout / High-Output-Current / SOT23 Voltage References
MAX6103EUR-T ,Low-Cost / Micropower / Low-Dropout / High-Output-Current / SOT23 Voltage References
MAX6120ESA ,Low-Cost / Micropower / Precision / 3-Terminal / 1.2V Voltage Reference

MAX2820AETM-MAX2820AETM+-MAX2820AETM+T-MAX2820ETM-MAX2820ETM+T
2.4GHz 802.11b Zero-IF Transceivers
General Description
The MAX2820/MAX2820A and MAX2821/MAX2821A
single-chip zero-IF transceivers are designed for the
802.11b (11Mbps) applications operating in the
2.4GHz to 2.5GHz ISM band. The transceivers are
nearly identical, except the MAX2821 and MAX2821A
also provide a low-power shutdown mode and an ana-
log voltage reference output. The MAX2820A/
MAX2821A are cost-reduced versions, virtually identi-
cal in pinout and performance to the MAX2820/
MAX2821. The transceivers include all the circuitry
required to implement an 802.11b RF-to-baseband
transceiver solution, providing a fully integrated
receive path, transmit path, VCO, frequency synthesis,
and baseband/control interface. Only a PA, RF switch,
RF BPF, and a small number of passive components are
needed to form the complete radio front-end solution.
The ICs eliminate the need for external IF and base-
band filters by utilizing a direct-conversion radio archi-
tecture and monolithic baseband filters for both
receiver and transmitter. They are specifically opti-
mized for 802.11b (11Mbps CCK) applications. The
baseband filtering and Rx and Tx signal paths support
the CCK modulation scheme for BER = 10-5 at the
required sensitivity levels.
The devices are suitable for the full range of 802.11b
data rates (1Mbps, 2Mbps, 5.5Mbps, and 11Mbps) and
also the higher-rate 22Mbps PBCCTMstandard. The
MAX2820 and MAX2821 are available in a 7mm ×7mm
48-lead QFN package. The MAX2820, MAX2821,
MAX2820A, and MAX2821A are available in a 48-lead
thin QFN package.
Applications
802.11b 11Mbps WLAN
802.11b+22Mbps PBCCHigh-Data-Rate WLAN
802.11a + b Dual-Band WLAN
2.4GHz ISM Band Radios
Features2.4GHz to 2.5GHz ISM Band Operation802.11b (11Mbps CCK and 22Mbps PBCC) PHY
CompatibleComplete RF-to-Baseband Transceiver
Direct-Conversion Upconverters and
Downconverters
Monolithic Low-Phase-Noise VCO
Integrated Baseband Lowpass Filters
Integrated PLL with 3-Wire Serial Interface
Digital Bias Control for External PA
Transmit Power Control (Range > 25dB)
Receive Baseband AGC (Range > 65dB)
Complete Baseband Interface
Digital Tx/Rx Mode Control
Analog Receive Level Detection-97dBm Rx Sensitivity at 1Mbps-87dBm Rx Sensitivity at 11Mbps+2dBm Transmit Power (11Mbps CCK)Single +2.7V to +3.6V SupplyLow-Current Shutdown Mode (MAX2821 only)Very Small 48-Pin QFN Package(s)
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
Ordering Information
19-2493; Rev 5; 5/05
PARTTEMP RANGEPIN-PACKAGE
MAX2820ETM-TD-40°C to +85°C48 Thin QFN
MAX2820ETM+TD-40°C to +85°CLead Free
MAX2820AETM-TD-40°C to +85°C48 Thin QFN
MAX2820AETM+TD-40°C to +85°CLead Free
MAX2821ETM-TD-40°C to +85°C48 Thin QFN
MAX2821ETM+TD-40°C to +85°CLead Free
MAX2821AETM-TD-40°C to +85°C48 Thin QFN
MAX2821AETM+TD-40°C to +85°CLead Free
Pin Configuration/Functional Diagram and Typical
Application Circuit appear at end of data sheet.
PBCC is a trademark of Texas Instruments, Inc.
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, RF_GAIN = VIH, 0V ≤VTX_GC≤+2.0V, 0V ≤VRX_AGC≤+2.0V, RBIAS = 12kΩ, no
input signals at RF and baseband inputs, all RF inputs and outputs terminated into 50Ω, receiver baseband outputs are open, trans-
mitter baseband inputs biased at +1.2V, registers set to default power-up settings, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at VCC= +2.7V, TA= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCPins to GND...................................................-0.3V to +4.2V
RF Inputs: RX_RFP, RX_RFN to GND.........-0.3V to (VCC+ 0.3V)
RF Outputs: TX_RFP, TX_RFN to GND..................-0.3V to +4.2V
Baseband Inputs: TX_BBIP, TX_BBIN, TX_BBQP,
TX_BBQN to GND...................................-0.3V to (VCC + 0.3V)
Baseband Outputs: RX_BBIP, RX_BBIN, RX_BBQP,
RX_BBQN to GND...................................-0.3V to (VCC+ 0.3V)
Analog Inputs: RX_AGC, TX_GC, TUNE, ROSCN,
ROSCP to GND.......................................-0.3V to (VCC+ 0.3V)
Analog Outputs: PA_BIAS, CP_OUT, VREF
to GND.....................................................-0.3V to (VCC+ 0.3V)
Digital Inputs: RX_ON, TX_ON, SHDNB, CSB, SCLK,
DIN, RF_GAIN, RX_1K to GND................-0.3V to (VCC+ 0.3V)
Bias Voltages: RBIAS, BYP..................................+0.9V to +1.5V
Short-Circuit Duration Digital Outputs: DOUT, RX_DET.........10s
RF Input Power: RX_RFN, RX_RFP.................................+10dBm
Continuous Power Dissipation (TA= +70°C)
48-Lead QFN (derate 27.0mW/°C above +70°C)...........2162mW
48-Lead Thin QFN (derate 38.5mW/°C
above +70°C)...................................................................3077mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSCONDITIONSMINTYPMAXUNITS
Supply Voltage2.73.6V
Shutdown-Mode Supply Current
(MAX2821 and MAX2821A)
SHDNB = VIL, RX_ON = VIL,
TX_ON = VILTA = -40°C to +85°C250µA
TA = +25°C2535Standby-Mode Supply CurrentSHDNB = VIH, RX_ON = VIL,
TX_ON = VILTA = -40°C to +85°C40mA
TA = +25°C80100Receive-Mode Supply CurrentSHDNB = VIH, RX_ON = VIH,
TX_ON = VILTA = -40°C to +85°C110mA
TA = +25°C7085Transmit-Mode Supply CurrentSHDNB = VIH, RX_ON = VIL,
TX_ON = VIHTA = -40°C to +85°C90mA
LOGIC INPUTS: SHDNB, RX_ON, TX_ON, SCLK, DIN, CSB, RF_GAIN
Digital Input Voltage High (VIH)VCC - 0.5V
Digital Input Voltage Low (VIL)0.5V
Digital Input Current High (IIH)-5+5µA
Digital Input Current Low (IIL)-5+5µA
LOGIC OUTPUTS: DOUT, RX_DET
Digital Output Voltage High (VOH)Sourcing 100µAVCC - 0.5V
Digital Output Voltage Low (VOL)Sinking 100µA0.5V
RX BASEBAND I/O
RX_AGC Input Resistance0V ≤ VRX_AGC ≤ +2.0V50kΩ
RX I/Q Common-Mode Voltage1.25V
RX I/Q Output DC Offsets15mV
VOLTAGE REFERENCE (MAX2821/MAX2821A)
Reference Voltage OutputTA = -40°C to +85°C, ILOAD = ±2mA1.11.21.3V
Output Impedance25Ω
CAUTION! ESD SENSITIVE DEVICE
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
DC ELECTRICAL CHARACTERISTICS (continued)
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, RF_GAIN = VIH, 0V ≤VTX_GC≤+2.0V, 0V ≤VRX_AGC≤+2.0V, RBIAS = 12kΩ, no
input signals at RF and baseband inputs, all RF inputs and outputs terminated into 50Ω, receiver baseband outputs are open, trans-
mitter baseband inputs biased at +1.2V, registers set to default power-up settings, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at VCC= +2.7V, TA= +25°C, unless otherwise noted.) (Note 1)
AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, fRFand fLO= 2400MHz to 2499MHz, fOSC= 22MHz or 44MHz, receive baseband
outputs = 500mVP-P, SHDNB = RX_ON = VIH, TX_ON = VIL, CSB = VIH, SCLK = DIN = VIL, RF_GAIN = VIH, 0V ≤VRX_AGC≤+2.0V,
RBIAS = 12kΩ, ICP= +2mA, BWPLL= 45kHz, differential RF input matched to 50Ω, registers set to default power-up settings, TA=
+25°C, unless otherwise noted. Typical values are at VCC= +2.7V, fLO= 2437MHz, fOSC= 22MHz, unless otherwise noted.) (Note 1)
PARAMETERSCONDITIONSMINTYPMAXUNITS
TX BASEBAND I/O
TX BB Input Common-Mode
Range1.01.21.4V
TX BBI and BBQ Input Bias
Current-10µA
TX BB Input ImpedanceDifferential resistance100kΩ
TX_GC Input Bias Current0V ≤ VTX_GC ≤ +2.0V10µA
TX_GC Input ImpedanceResistance250kΩ
REFERENCE OSCILLATOR INPUT
Reference Oscillator Input
Impedance20kΩ
PARAMETERCONDITIONSMINTYPMAXUNITS
RECEIVER CASCADE PERFORMANCE (RF INPUT TO BASEBAND OUTPUT)
RF Frequency Range24002499MHz
LO Frequency Range24002499MHz
TA = +25°C97105RF_GAIN = VIH,
VRX_AGC = 0VTA = -40°C to +85°C95
RF_GAIN = VIH,
VRX_AGC = +2.0VTA = +25°C33
RF_GAIN = VIL,
VRX_AGC = 0VTA = +25°C75
Voltage Gain (Note 2)
RF_GAIN = VIL,
VRX_AGC = +2.0VTA = +25°C2
RF Gain StepFrom RF_GAIN = VIH to RF_GAIN =VIL30dB
RF_GAIN = VIH, RX gain ≥ 80dB3.5
RF_GAIN = VIH, RX gain = 50dB4.5DSB Noise Figure (Note 3)
RF_GAIN = VIL, RX gain = 50dB34
Adjacent Channel RejectionRX gain = 70dB (Note 4)49dB
RF_GAIN = VIH, RX gain = 80dB-14Input Third-Order Intercept Point (Note 5)RF_GAIN = VIL, RX gain = 50dB18dBm
RF_GAIN = VIH, RX gain = 80dB22Input Second-Order Intercept Point (Note 6)RF_GAIN = VIL, RX gain = 50dB60dBm
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE (continued)
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, fRFand fLO= 2400MHz to 2499MHz, fOSC= 22MHz or 44MHz, receive baseband
outputs = 500mVP-P, SHDNB = RX_ON = VIH, TX_ON = VIL, CSB = VIH, SCLK = DIN = VIL, RF_GAIN = VIH, 0V ≤VRX_AGC≤+2.0V,
RBIAS = 12kΩ, ICP= +2mA, BWPLL= 45kHz, differential RF input matched to 50Ω, registers set to default power-up settings, TA=
+25°C, unless otherwise noted. Typical values are at VCC= +2.7V, fLO= 2437MHz, fOSC= 22MHz, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
LO Leakage-65dBm
Input Return LossWith external match15dB
RECEIVER BASEBAND
BASEBAND FILTER RESPONSE
MAX2820/
MAX2821
Default bandwidth setting
BW (2:0) = (010)7
-3dB Frequency
MAX2820A/
MAX2821A8
MHz
At 12.5MHz40
At 16MHz65
At 20MHz70
MAX2820/
MAX2821
At 30MHz85
At 12.5MHz28
At 16MHz52
At 20MHz70
Attenuation Relative to Passband
MAX2820A/
MAX2821A
At 30MHz85
dB
BASEBAND OUTPUT CHARACTERISTICS
RX I/Q Gain Imbalance-1+1 dB
RX I/Q Phase Quadrature Imbalance-5+5Degrees
RX I/Q Output 1dB CompressionDifferential voltage into 5kΩ1VP-P
RX I/Q Output THDVOUT = 500mVP-P at 5.5MHz, ZL = 5kΩ||5pF-35dBc
BASEBAND AGC AMPLIFIER
AGC RangeVRX_AGC = 0 to +2.0V70dB
AGC SlopePeak gain slope60dB/V
AGC Response Time20dB gain step, 80dB to 60dB,
settling to ±1dB2µs
BASEBAND RX PEAK LEVEL DETECTION (MAX2820/MAX2821 ONLY)
RF_GAIN = VIH,
RX_DET = VOL to VOH-49
RX Detector Trip Point (at RX_RF)CW signal
RF_GAIN = VIL,
RX_DET = VOH to VOL-54
dBm
RX Detector Hysteresis5dB
RX Detector Rise TimeWith 3dB overdrive1µs
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—TRANSMIT MODE
(MAX2820/MAX2821EV kit: VCC= +2.7V to +3.6V, fRFand fLO= 2400MHz to 2499MHz, fOSC= 22MHz or 44MHz, transmit baseband
inputs = 400mVP-P, SHDNB = TX_ON = VIH, RX_ON = VIL, CSB = VIH, 0V ≤VTX_GC≤+2.0V, RBIAS = 12kΩ, ICP= +2mA, BWPLL=
45kHz, differential RF output matched to 50Ωthrough a balun, baseband input biased at +1.2V, registers set to default power-up set-
tings, TA= +25°C, unless otherwise noted. Typical values are at VCC= +2.7V, fLO= 2437MHz, fOSC= 22MHz, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
TRANSMIT SIGNAL PATH: BASEBAND INPUT TO RF OUTPUT
RF Output Frequency Range24002499MHz
LO Output Frequency Range24002499MHz
TA = +25°C-1+3
TX RF Output PowerIN = 400mV P - P at
5.5M H z,TX _GC = 0V ,
I/Q C W si g nal (N ote 7)
TA = -40°C to
+85°C-2
dBm
-22MHz ≤ fOFFSET ≤ -11MHz,
11MHz ≤ fOFFSET ≤ 22MHz-37
TX RF ACPR (Note 8)
-33MHz ≤ fOFFSET < -22MHz,
22MHz < fOFFSET ≤ 33MHz-59
dBc
Unwanted sideband-40
LO signal-30In-Band Spurious Signals Relative to
Modulated Carrier
fRF = 2400MHz to
2483MHz
Spurs > ±22MHz-80
dBc
2 × fLO-40TX RF Harmonics3 × fLO-55dBm
fRF < 2400MHz-60
fRF = 2500MHz to 3350MHz-43
TX RF Spurious Signal Emissions
(Outside 2400MHz to 2483.5MHz)
Nonharmonic SignalsfRF > 3350MHz-45
dBm
TX RF Output NoisefOFFSET ≥ 22MHz, 0V ≤ VTX_GC ≤ +2.0V-135dBm/Hz
TX RF Output Return LossWith external match15dB
TX BASEBAND FILTER RESPONSE
-3dB Frequency10MHz
At 22MHz25Attenuation Relative to PassbandAt 44MHz50dB
TX GAIN-CONTROL CHARACTERISTICS
Gain-Control Range0V ≤ VTX_GC ≤ +2.0V30dB
Gain-Control SlopePeak gain slope40dB/V
Gain-Control Response TimeVTX_GC = +2.0V to 0V step0.3µs
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—SYNTHESIZER
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, fRFand fLO= 2400MHz to 2499MHz, fOSC= 22MHz or 44MHz, SHDNB = VIH,
CSB = VIH, RBIAS = 12kΩ, ICP= +2mA, BWPLL= 45kHz, registers set to default power-up settings, TA= +25°C, unless otherwise
noted. Typical values are at VCC= +2.7V, fLO= 2437MHz, fOSC= 22MHz, unless otherwise noted.) (Note 11)
PARAMETERCONDITIONSMINTYPMAXUNITS
FREQUENCY SYNTHESIZER
LO Frequency Range24002499MHz
R(0) = 022Reference FrequencyR(0) = 144MHz
Channel Spacing1MHz
ICP = 0±1MAX2820/MAX2821ICP = 1±2Charge-Pump Output Current
MAX2820A/MAX2821A±2
Charge-Pump Compliance Range0.4VCC - 0.4V
-11MHz ≤ fOFFSET ≤ 11MHz-41
-22MHz ≤ fOFFSET < -11MHz,
11MHz < fOFFSET ≤ 22MHz-75Reference Spur Level (Note 10)
fOFFSET < -22MHz, fOFFSET > 22MHz-90
dBc
fOFFSET = 10kHz-80Closed-Loop Phase NoisefOFFSET = 100kHz-87dBc/Hz
Closed-Loop Integrated Phase NoiseNoise integrated from 100Hz to 10MHz,
measured at the TX_RF output2.5°RMS
Reference Oscillator Input LevelAC-coupled sine wave input2006001000mVP-P
VOLTAGE-CONTROLLED OSCILLATOR
VCO Tuning Voltage Range0.42.3V
fLO = 2400MHz170VCO Tuning GainfLO = 2499MHz130MHz/V
AC ELECTRICAL CHARACTERISTICS—PA BIAS
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, SHDNB = VIH, TX_ON = VIH, CSB = VIH, PA_BIAS enabled, RBIAS = 12kΩ, regis-
ters set to default power-up settings, TA= +25°C, unless otherwise noted. Typical values are at VCC= +2.7V, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
Resolution4Bits
Full-Scale Output Current300µA
LSB Size20µA
Output Voltage Compliance Range(Note 11)1.01.21.3V
Settling Time
Relative to rising edge of CSB, zero to full-
scale step 0000 → 1111, settle to 1/2 LSB,
2pF load
1µs
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—SYSTEM TIMING
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, fRFand fLO= 2400MHz to 2499MHz, fOSC= 22MHz or 44MHz, SHDNB = VIH,
CSB = VIH, RBIAS = 12kΩ, ICP= +2mA, BWLOOP= 45kHz, registers set to default power-up settings, TA= +25°C, unless otherwise
noted. Typical values are at VCC= +2.7V, fLO= 2437MHz, fOSC= 22MHz, unless otherwise noted.) (Note 11)
PARAMETERCONDITIONSMINTYPMAXUNITS
Channel-Switching TimefLO = 2400MHz ↔ 2499MHz,
fLO settles to ±10kHz (Note 9)150200µs
RX to TX, output settles to within ±2dB of final value of
output power, relative to rising edge of TX_ON3
RX/TX Turnaround Time
(Note 11)TX to RX, output settles to within ±2dB of final value of
output power, relative to rising edge of RX_ON5
Standby-to-Transmit ModeStandby to TX, output settles to within ±2dB of final value
of output power, relative to rising edge of TX_ON (Note 11)3µs
Standby-to-Receive ModeStandby to RX, output settles to within ±2dB of final value
of output power, relative to rising edge of RX_ON (Note 11)5µs
AC ELECTRICAL CHARACTERISTICS—SERIAL INTERFACE TIMING
(MAX2820/MAX2821 EV kit: VCC= +2.7V to +3.6V, registers set to default power-up settings, TA= +25°C, unless otherwise noted.) (Note 11)
PARAMETERCONDITIONSMINTYPMAXUNITS
SERIAL INTERFACE TIMING (See Figure 1)
tCSOSCLK rising edge to CSB falling edge wait time5ns
tCSSFalling edge of CSB to rising edge of first SCLK time5ns
tDSData-to-serial clock setup time5ns
tDHData-to-clock hold time10ns
tCHSerial clock pulse-width high10ns
tCLClock pulse-width low10ns
tCSHLast SCLK rising edge to rising edge of CSB5ns
tCSWCSB high pulse width10ns
tCS1Time between the rising edge of CSB and the next rising edge of SCLK5ns
fCLKClock frequency50MHz
Note 1:Parameters are production tested at +25°C only. Min/max limits over temperature are guaranteed by design and characterization.
Note 2:Defined as the baseband differential RMS output voltage divided by the RMS input voltage (at the RF balun input).
Note 3:Noise-figure specification excludes the loss of the external balun. The external balun loss is typically ~0.5dB.
Note 4:CCK interferer at 25MHz offset. Desired signal equals -73dBm. Interferer amplitude increases until baseband output from
interferer is 10dB below desired signal. Adjacent channel rejection = Pinterferer- Pdesired.
Note 5:Measured at balun input. Two CW tones at -43dBm with 15MHz and 25MHz spacing from the MAX2820/MAX2821 channel
frequency. IP3 is computed from 5MHz IMD3 product measured at the RX I/Q output.
Note 6:Two CW interferers at -38dBm with 24.5MHz and 25.5MHz spacing from the MAX2820/MAX2821 channel frequency. IP2 is
computed from the 1MHz IMD2 product measured at the RX I/Q output.
Note 7:Output power measured after the matching and balun. TX gain is set to maximum.
Note 8:Adjacent and alternate channel power relative to the desired signal. TX gain is adjusted until the output power is -1dBm.
Power measured with 100kHz video BW and 100kHz resolution BW.
Note 9:Time required to reprogram the PLL, change the operating channel, and wait for the operating channel center frequency to
settle within ±10kHz of the nominal (final) channel frequency.
Note 10:Relative amplitude of reference spurious products appearing in the TX RF output spectrum relative to a CW tone at
0.5MHz offset from the LO.
Note 11:Min/max limits are guaranteed by design and characterization.
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
Typical Operating Characteristics
(MAX2820/MAX2821 EV kit, VCC= +2.7V, fBB= 1MHz, fLO= 2450MHz, receive baseband outputs = 500mVP-P, transmit base-
band inputs = 400mVP-P, ICP= +2mA, BWPLL= 45kHz, differential RF input/output matched to 50Ωthrough a balun, baseband
input biased at +1.2V, registers set to default power-up settings, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX2820 toc01
TEMPERATURE (°C)
ICC
(mA)3510-15
RECEIVE, VRF_GAIN = VIH
RECEIVE, VRF_GAIN = VILTRANSMIT
STANDBY
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2820 toc02
VCC (V)
ICC
(mA)
RECEIVE, VRF_GAIN = VIH
RECEIVE, VRF_GAIN = VILTRANSMIT
STANDBY
MAX2820 toc03
VRX_AGC (V)
RX VOLTAGE GAIN (dB)
RECEIVER VOLTAGE GAIN
vs. GAIN-CONTROL VOLTAGE
VOUT = 500mVP-P
fBB = 1MHz
fLO = 2450MHz
VRF_GAIN = VIH,
("A" VERSION)
VRF_GAIN = VIL,
("A" VERSION)
VRF_GAIN = VIH
VRF_GAIN = VIL
MAX2820 toc04
RF FREQUENCY (MHz)
RX VOLTAGE GAIN (dB)
RECEIVER VOLTAGE GAIN
vs. RF FREQUENCY
fBB = 1MHz
VRF_GAIN = VIL, VRX_AGC = 2.0V
VRF_GAIN = VIH, VRX_AGC = 2.0V
MAX2820 toc05
RX GAIN (dB)
NOISE FIGURE (dB)604020
RECEIVER NOISE FIGURE vs. GAIN
VRF_GAIN = VIL
fBB = 1MHz
fLO = 2450MHz
VRF_GAIN = VIH
MAX2820 toc06
PIN (dBm)
LOGIC LEVEL
RECEIVER DETECTOR HYSTERESIS
vs. INPUT POWER
HIGH-GAIN MODE
MAX2820/MAX2821 ONLY
LOW-GAIN MODE
HIGH
LOW
HIGH
LOW
MAX2820 toc07
FREQUENCY (kHz)
NORMALIZED RESPONSE (dB)
RECEIVER FILTER RESPONSE
(1kHz TO 1MHz)
RX_1K = VIH
RX_1K = VIH,
("A" VERSION)
RX_1K = VIL,
(BOTH VERSIONS)
MAX2820 toc08
FREQUENCY (MHz)
NORMALIZED RESPONSE (dB)
"A" VERSION
RECEIVER FILTER RESPONSE
(1MHz TO 100MHz)RECEIVER LEAKAGE SPECTRUM
MAX2820 toc09
FREQUENCY (GHz)
RECEIVER LEAKAGE POWER (dBm)
VRF_GAIN = VIH
fLO = 2400MHz
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
RECEIVER BASEBAND OUTPUT SPECTRUM
MAX2820 toc10
FREQUENCY (MHz)
BASEBAND OUTPUT POWER (dBm)405101525302035
VRF_GAIN = VIH
RX GAIN = 50dB
fBB = 5MHz
fLO = 2450MHz
MAX2820 toc11
FREQUENCY (MHz)
TX OUTPUT POWER (dBm)
TRANSMITTER OUTPUT POWER
vs. FREQUENCY
+25°C
("A" VERSION)
+85°C
("A" VERSION)
-40°C
("A" VERSION)
+85°C
+25°C
-40°C
VIN = 400mVP-P
VTX_GC = 0V
11Mbps CCK
MAX2820 toc12
VCC (V)
TX OUTPUT POWER (dBm)
TRANSMITTER OUTPUT POWER
vs. SUPPLY VOLTAGE
-40°C
+25°C
+85°C
-40°C ("A" VERSION)
+25°C ("A" VERSION)
+85°C ("A" VERSION)
VIN = 400mVP-P
VTX_GC = 0V
11Mbps CCK
TRANSMITTER OUTPUT SPECTRUM
MAX2820 toc13
FREQUENCY OFFSET FROM CARRIER (MHz)
TX OUTPUT POWER (dBm)
RBW = 100kHz
VIN = 400mVP-P
11Mbps CCK
POUT = -1dBm
TRANSMITTER OUTPUT SPECTRUM
MAX2820toc14
FREQUENCY (GHz)
TX OUTPUT POWER (dBm)
CW SIGNAL
fBB = 3.3MHz
fLO = 2450MHz
MAX2820 toc15
VTX_GC (V)
NORMALIZED GAIN (dB)
TRANSMITTER GAIN
vs. GAIN-CONTROL VOLTAGE
0dB = MAX POUT AT +25°C
VIN = 400mVP-P
11Mbps CCK
+25°C
-40°C
+85°C
-40°C ("A" VERSION)
+25°C ("A" VERSION)
+85°C ("A" VERSION)
Typical Operating Characteristics (continued)
(MAX2820/MAX2821 EV kit, VCC= +2.7V, fBB= 1MHz, fLO= 2450MHz, receive baseband outputs = 500mVP-P, transmit base-
band inputs = 400mVP-P, ICP= +2mA, BWPLL= 45kHz, differential RF input/output matched to 50Ωthrough a balun, baseband
input biased at +1.2V, registers set to default power-up settings, TA= +25°C, unless otherwise noted.)
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
10010k100k1k1M
CLOSED-LOOP PHASE NOISE
vs. OFFSET FREQUENCY
MAX2820 toc19
OFFSET FREQUENCY (Hz)
PHASE NOISE (dBc/Hz)
fLO = 2450MHz
BWLOOP = 45kHz
ICP = 2mA
φINT = 2.1°RMS
MAX2820/MAX2821
("A" VERSION)
MAX2820/MAX2821
VCO/PLL SETTING TIME
MAX2820 toc20
TIME (μs)
FREQUENCY ERROR (kHz)
BWLOOP = 45kHz
fLO = 2499MHz TO 2400MHz
Typical Operating Characteristics (continued)
(MAX2820/MAX2821 EV kit, VCC= +2.7V, fBB= 1MHz, fLO= 2450MHz, receive baseband outputs = 500mVP-P, transmit baseband
inputs = 400mVP-P, ICP= +2mA, BWPLL= 45kHz, differential RF input/output matched to 50Ωthrough a balun, baseband input
biased at +1.2V, registers set to default power-up settings, TA= +25°C, unless otherwise noted.)
TRANSMITTER BASEBAND FILTER RESPONSE
MAX2820 toc16
FREQUENCY (MHz)
NORMALIZED RESPONSE (dB)8070605040302010
fLO = 2450MHz
LO FREQUENCY vs. TUNING VOLTAGE
MAX2820 toc17
VTUNE (V)
LO FREQUENCY (GHz)
+25°C
+85°C
-40°C
OPEN-LOOP PHASE NOISE
vs. OFFSET FREQUENCY
MAX2820 toc18
OFFSET FREQUENCY (kHz)
PHASE NOISE (dBc/Hz)
fLO = 2450MHz
MEASURED AT
TX OUTPUT
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
Pin Configuration/Functional Diagram
VCC_DRVR14151617181920212223244746454443424140393837
VCC_LNA
VREF
(MAX2821/MAX2821A)
RF_GAIN
RX_RFN
RX_RFP
VCC_REF
RBIAS
TX_RFP
TX_RFN
PA_BIAS
TX_GC
VCC_TMX
TX_BBINTX_BBIP
TX_BBQP
TX_BBQN
VCC_TXFGND_DIGVCC_DIG
N.C.
ROSCPROSCN
DIN
SHDNB
VCC_RXF
VCC_LO
VCC_VCO
BYP
TUNE
GND_VCO
GND_CP
CP_OUT
VCC_CP
CSB
SCLK
RX_AGCTX_ONVCC_RMXRX_ONVCC_BUFRX_BBIPRX_BBINRX_BBQNRX_BBQPRX_1KDOUTRX_DET (MAX2820/MAX2821)N.C. (MAX2820A/MAX2821A)
MAX2820/MAX2821
PROGRAMMING AND
MODE CONTROLRX LEVEL
DETECTOR00
INTEGER-N
SYNTHESIZER
SERIAL
INTERFACE
VOS COMP
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
Pin Description
PINNAMEDESCRIPTIONVCC_LNASupply Voltage for LNA. Bypass with a capacitor as close to the pin as possible. Do not share the
bypass capacitor ground vias with other branches.
N.C.No Connection. Not internally connected (MAX2820/MAX2820A only).2VREFVoltage Reference Output (MAX2821/MAX2821A only).RF_GAINLNA Gain Select Logic Input. Logic high for LNA high-gain mode, logic low for LNA low-gain mode.RX_RFNReceiver LNA Negative Input. On-chip AC-coupling. Requires off-chip impedance match and
connection to 2:1 balun.RX_RFPReceiver LNA Positive Input. On-chip AC-coupling. Requires off-chip impedance match and
connection to 2:1 balun.VCC_REFSupply Voltage for Bias Circuitry and Autotuner. Bypass with a capacitor as close to the pin as
possible. Do not share the bypass capacitor ground vias with other branches.RBIASPrecision Bias Resistor Pin. Connect a 12kΩ precision resistor (≤2%) to GND.TX_RFPTransmit Driver Amplifier Positive Output. On-chip pullup choke to VCC. Requires off-chip impedance
match and connection to 4:1 balun.TX_RFNTransmit Driver Amplifier Negative Output. On-chip pullup choke to VCC. Requires off-chip
impedance match and connection to 4:1 balun.PA_BIASPower-Amplifier Bias-Current Control Signal. Analog output. High-impedance, open-drain current
source. Connect directly to bias-current control input on external PA.VCC_DRVRSupply Voltage for Transmit Driver. Bypass with a capacitor as close to the pin as possible. Do not
share the bypass capacitor ground vias with other branches.TX_GCTransmit Gain-Control Input. Analog high-impedance input. Connect directly to baseband IC DAC
output. See the Typical Operating Characteristics for Transmitter Gain vs. Gain-Control Voltage.VCC_TMXSupply Voltage for Transmit Mixer and VGA. Bypass with a capacitor as close to the pin as possible.
Do not share the bypass capacitor ground vias with other branches.TX_BBINTransmit Negative In-Phase Baseband Input. Analog high-impedance differential input. Connect
directly to baseband IC DAC voltage output. Requires a 1.2V common-mode voltage.TX_BBIPTransmit Positive In-Phase Baseband Input. Analog high-impedance differential input. Connect
directly to baseband IC DAC voltage output. Requires a 1.2V common-mode voltage.TX_BBQPTransmit Positive Quadrature Baseband Input. Analog high-impedance differential input. Connect
directly to baseband IC DAC voltage output. Requires a 1.2V common-mode voltage.TX_BBQNTransmit Negative Quadrature Baseband Input. Analog high-impedance differential input. Connect
directly to baseband IC DAC voltage output. Requires a 1.2V common-mode voltage.VCC_TXFSupply Voltage for Transmit Baseband Filter. Bypass with a capacitor as close to the pin as possible.
Do not share the bypass capacitor ground vias with other branches.GND_DIGDigital Ground
MAX2820/MAX2820A/MAX2821/MAX2821A
2.4GHz 802.11b Zero-IF Transceivers
Pin Description (continued)
PINNAMEDESCRIPTIONVCC_DIGSupply Voltage for Digital Circuitry. Bypass with a capacitor as close to the pin as possible. Do not
share the bypass capacitor ground vias with other branches.N.C.No Connection. Not internally connected.ROSCPReference Oscillator Positive Input. Analog high-impedance differential input. DC-coupled. Requires
external AC-coupling. Connect an external reference oscillator to this analog input.ROSCNReference Oscillator Negative Input. Analog high-impedance differential input. DC-coupled. Requires
external AC-coupling. Bypass this analog input to ground with a capacitor for single-ended operation.DIN3-Wire Serial-Interface Data Input. Digital high-impedance input. Connect directly to baseband IC
serial-interface CMOS output (SPI™/QSPI™/MICROWIRE™ compatible).SCLK3-Wire Serial-Interface Clock Input. Digital high-impedance input. Connect this digital input directly to
baseband IC serial-interface CMOS output (SPI/QSPI/MICROWIRE compatible).CSB3-Wire Serial-Interface Enable Input. Digital high-impedance input. Connect directly to baseband IC
serial-interface CMOS output (SPI/QSPI/MICROWIRE compatible).VCC_CPSupply Voltage for PLL Charge Pump. Bypass with a capacitor as close to the pin as possible. Do not
share the bypass capacitor ground vias with other branches.CP_OUTPLL Charge-Pump Output. Analog high-impedance output. Current source. Connect directly to the
PLL loop filter input.GND_CPPLL Charge-Pump Ground. Connect to PC board ground plane.GND_VCOVCO Ground. Connect to PC board ground plane.TUNEVCO Frequency Tuning Input. Analog high-impedance voltage input. Connect directly to the PLL loop
filter output.BYPVCO Bias Bypass. Bypass with a 2000pF capacitor to ground.VCC_VCO
Supply Voltage for VCO. Bypass with a capacitor as close to the pin as possible. Do not share the
bypass capacitor ground vias with other branches. Important note: Operate from separate regulated
supply voltage.VCC_LOSupply Voltage for VCO, LO Buffers, and LO Quadrature Circuitry. Bypass with a capacitor as close
to the pin as possible. Do not share the bypass capacitor ground vias with other branches.VCC_RXFSupply Voltage for Receiver Baseband Filter. Bypass with a capacitor as close to the pin as possible.
Do not share the bypass capacitor ground vias with other branches.SHDNB
Active-Low Shutdown Input. Digital high-impedance CMOS input. Connect directly to baseband IC
mode control CMOS output. Logic low to disable all device functions. Logic high to enable normal
chip operation.DOUTSerial-Interface Data Output. Digital CMOS output. Optional connection.RX_1K
Receiver 1kHz Highpass Bandwidth Control. Digital CMOS input. Connect directly to baseband IC
CMOS output. Controls receiver baseband highpass -3dB corner frequency; logic low for 10kHz,
logic high for 1kHz. See the Applications Information section for proper use of this function.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.

Partno	Mfg	Dc	Qty	Available	Descript
MAX2820ETM	MAXIM	N/a	20000	avai	2.4GHz 802.11b Zero-IF Transceivers
MAX2820ETM+T \|MAX2820ETMT	MAXIM	N/a	1116	avai	2.4GHz 802.11b Zero-IF Transceivers
MAX2820AETM	MAXIM	N/a	200	avai	2.4GHz 802.11b Zero-IF Transceivers
MAX2820AETM	MAX	N/a	7500	avai	2.4GHz 802.11b Zero-IF Transceivers
MAX2820AETM+ \|MAX2820AETM	MAXIM	N/a	650	avai	2.4GHz 802.11b Zero-IF Transceivers
MAX2820AETM+T	MAXIM	N/a	1953	avai	2.4GHz 802.11b Zero-IF Transceivers