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MAX2820ETM+T ,2.4GHz 802.11b Zero-IF Transceiversapplications. Thebaseband filtering and Rx and Tx signal paths support♦ +2dBm Transmit Power (11Mbp ..
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MAX6103EUR-T ,Low-Cost / Micropower / Low-Dropout / High-Output-Current / SOT23 Voltage References
MAX2820EGM-TD-MAX2820ETM+TD
2.4GHz 802.11b Zero-IF Transceivers
General DescriptionThe MAX2820/MAX2821 single-chip zero-IF transceivers
are designed for the 802.11b (11Mbps) applications
operating in the 2.4GHz to 2.5GHz ISM band. The trans-
ceivers are nearly identical, except the MAX2821 pro-
vides a low-power shutdown mode and an analog
voltage reference output feature and the MAX2820 does
not. The transceivers include all the circuitry required to
implement an 802.11b RF-to-baseband transceiver solu-
tion, 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/MAX2821 are available in the very small 7mm7mm 48-lead QFN package.
Applications802.11b 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/MAX2821
2.4GHz 802.11b Zero-IF Transceivers
Ordering Information19-2493; Rev 2; 11/03
Pin Configuration/Functional Diagram and Typical
Application Circuit appear at end of data sheet.PBCC is a trademark of Texas Instruments, Inc.
MAX2820/MAX2821
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.
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
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
MAX2820/MAX2821
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)
MAX2820/MAX2821
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)
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.)
MAX2820/MAX2821
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—TRANSMIT MODE (continued)(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.)
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.)
MAX2820/MAX2821
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)
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)
MAX2820/MAX2821
2.4GHz 802.11b Zero-IF Transceivers
AC ELECTRICAL CHARACTERISTICS—SYSTEM TIMING (continued)(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.)
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)
Note 1:Parameters are production tested at +25°C only. Min/max limits over temperature are guaranteed by design and charac-
terization.
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/MAX2821
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.)
MAX2820/MAX2821
2.4GHz 802.11b Zero-IF Transceivers
RECEIVER BASEBAND OUTPUT SPECTRUMMAX2820 toc10
FREQUENCY (MHz)
BASEBAND OUTPUT POWER (dBm)405101525302035
MAX2820 toc11
FREQUENCY (MHz)
TX OUTPUT POWER (dBm)
TRANSMITTER OUTPUT POWER
vs. FREQUENCY
MAX2820 toc12
VCC (V)
TX OUTPUT POWER (dBm)
TRANSMITTER OUTPUT POWER
vs. SUPPLY VOLTAGE
TRANSMITTER OUTPUT SPECTRUM
MAX2820 toc13
FREQUENCY OFFSET FROM CARRIER (MHz)
TX OUTPUT POWER (dBm)
TRANSMITTER OUTPUT SPECTRUM
MAX2820toc14
FREQUENCY (GHz)
TX OUTPUT POWER (dBm)
MAX2820 toc15
VTX_GC (V)
NORMALIZED GAIN (dB)
TRANSMITTER GAIN
vs. GAIN-CONTROL VOLTAGE
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/MAX2821
2.4GHz 802.11b Zero-IF Transceivers10010k100k1k1M
CLOSED-LOOP PHASE NOISE
vs. OFFSET FREQUENCYMAX2820 toc19
OFFSET FREQUENCY (Hz)
PHASE NOISE (dBc/Hz)
VCO/PLL SETTING TIMEMAX2820 toc20
TIME (µs)
FREQUENCY ERROR (kHz)
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.)
MAX2820/MAX2821
2.4GHz 802.11b Zero-IF Transceivers
Pin Configuration/Functional Diagram
MAX2820/MAX2821
2.4GHz 802.11b Zero-IF Transceivers
