MAX2685EEE ,Low-Cost / 900MHz / Low-Noise Amplifier and Downconverter MixerApplicationsMAX2685EEE -40°C to +85°C 16 QSOPCellular/Cordless Phones 900MHz ISM-Band RadiosWireles ..
MAX2685EEE-T ,Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter MixerApplicationsMAX2685EEE -40°C to +85°C 16 QSOPCellular/Cordless Phones 900MHz ISM-Band RadiosWireles ..
MAX268ACWG+ ,Pin-Programmable Universal and Bandpass FiltersELECTRICAL CHARACTERISTICS (Continued)
(v* Td." +5v, v- = -5v, CLK, = CLKB = , 5V, 1.5MHz, tas/to ..
MAX268BCNG ,Pin Programmable Universal and Bandpass FiltersELECTRICAL CHARACTERISTICS (Continued)
(v* Td." +5v, v- = -5v, CLK, = CLKB = , 5V, 1.5MHz, tas/to ..
MAX268BCNG ,Pin Programmable Universal and Bandpass FiltersELECTRICAL CHARACTERISTICS
(V+ = +5V, If" = AN, CLKA = CLK,3 = , 5V, 1.5MHz, fCLK/f0 = 197.92 for ..
MAX268BCNG+ ,Pin-Programmable Universal and Bandpass FiltersELECTRICAL CHARACTERISTICS (Continued)
(v* Td." +5v, v- = -5v, CLK, = CLKB = , 5V, 1.5MHz, tas/to ..
MAX603CPA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear RegulatorsFeatures' 500mA Output Current, with Foldback CurrentThe MAX603/MAX604 low-dropout, low quiescent c ..
MAX603CPA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear RegulatorsApplicationsMAX604EPA -40°C to +85°C 8 Plastic DIP5V and 3.3V RegulatorsMAX604ESA -40°C to +85°C 8 ..
MAX603CPA+ ,5V/3.3V or Adjustable, Low-Dropout, Low-IQ, 500mA Linear RegulatorsApplicationsMAX604EPA -40°C to +85°C 8 Plastic DIP5V and 3.3V RegulatorsMAX604ESA -40°C to +85°C 8 ..
MAX603CSA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear RegulatorsELECTRICAL CHARACTERISTICS(V = 6V (MAX603) or 4.3V (MAX604), C = C = 10µF, OFF = V , SET = GND, T = ..
MAX603CSA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear RegulatorsELECTRICAL CHARACTERISTICS (continued)(V = 6V (MAX603) or 4.3V (MAX604), C = C = 10µF, OFF = V , SE ..
MAX603CSA ,5V/3.3V or Adjustable, Low-Dropout, Low IQ, 500mA Linear RegulatorsGeneral Description ________
MAX2685EEE
Low-Cost / 900MHz / Low-Noise Amplifier and Downconverter Mixer
General DescriptionThe MAX2685’s low-noise amplifier (LNA) and down-
converter mixer comprise the major blocks of an RF
front-end receiver. Optimized for 900MHz operation,
the device’s low noise figure, high gain, and high linear-
ity make it ideal for cellular, cordless, and wireless data
applications. A low supply current of 8.5mA (high-gain
mode) and 3.8mA (low-gain mode) plus a low operating
supply voltage range of +2.7V to +5.5V make it suitable
for use in 3-cell NiCd or 1-cell lithium-ion (Li+) battery
applications. A low-power shutdown mode further
extends battery life by reducing supply current below
0.1µA.
The MAX2685 includes an LNA, LNA bypass switch,
downconverter mixer, and local-oscillator (LO) buffer.
The LNA has a low noise figure of 1.4dB, a high gain of
15dB, and an input third-order intercept point (IP3) of
-4dBm. The mixer has a noise figure of 13dB, a gain of
6dB, and an input IP3 of +7dBm. In addition, an LNA
bypass switch allows two levels of gain, reducing
power consumption when high gain is not needed.
The downconverter mixer has a single-ended RF input
port and differential IF output ports. Differential opera-
tion of the IF ports offers improved even-order harmonic
rejection and increased immunity to noise. An LO buffer
allows the LO port to be driven with only -8dBm of LO
power. The MAX2685 is offered in a space-saving 16-
pin QSOP package.
ApplicationsCellular/Cordless Phones900MHz ISM-Band Radios
Wireless Data868MHz European ISM Band
Features800MHz to 1000MHz RF Frequency Range+2.7V to +5.5V Single-Supply OperationIntegrated LNA + Mixer + LO Buffer Logic-Controlled LNA Bypass Switch Reduces
Supply CurrentLNA Performance (High/Low Gain)
Gain: +15dB/-12dB
NF: 1.4dB/12dB
Input IP3: -4dBm/+16dBmMixer Performance (High/Low Gain)
Gain: 6dB/4.6dB
NF: 13dB/12dB
Input IP3: +7dBm/-1.5dBmSupply Current
8.5mA (High Gain)
3.8mA (Low Gain)<0.1µA Supply Current in Shutdown Mode0.8µs Receiver Enable Time
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Functional Diagram
Pin Configuration
Ordering Information
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= +2.7V to +5.5V,VSHDN= +2V, VGAIN= +2V, LNAIN = LNAOUT = MIXIN = LO = unconnected, IFOUT+ = IFOUT- = VCC, TA
= -40°C to +85°C. Typical values are at TA= +25°C and VCC= +3V, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS(MAX2685 EV kit, VCC= VSHDN= +3V, fLNAIN= fMIXIN= 880MHz, fLO= 960MHz, PLNAIN = -30dBm, PLO= -8dBm, PMIXIN= -25dBm,
differential IFOUT operation, Zo= 50Ω, TA= +25°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.
VCCto GND..............................................................-0.3V to +6V
LNAIN Input Power (50Ωsource)...................................+10dBm
LO Input Power (50Ωsource)........................................+10dBm
MIXIN Input Power (50Ωsource)...................................+10dBm
IFOUT+, IFOUT- to GND..........................................-0.3V to +6V
LNAOUT to GND......................................................-0.3V to +6V
GAIN, SHDNto GND..................................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
AC ELECTRICAL CHARACTERISTICS (continued)(MAX2685 EV kit, VCC= VSHDN= +3V, fLNAIN= fMIXIN= 880MHz, fLO= 960MHz, PLNAIN = -30dBm, PLO= -8dBm, PMIXIN= -25dBm,
differential IFOUT operation, Zo= 50Ω, TA= +25°C, unless otherwise noted.)
Note 1:This is the recommended operating frequency range.
Note 2:Maximum and minimum limits are guaranteed by design and device characterization and are not production tested.
Note 3:Two tones at 880MHz and 880.1MHz, -30dBm per tone.
Note 4:Two tones at 880MHz and 880.1MHz, -10dBm per tone.
Note 5:Two tones at 880MHz and 880.1MHz, -25dBm per tone.
Note 6:Time from SHDN= high, until the cascaded receive gain is within 1dB of its final value. Measured with 47pF blocking
capacitors on LNAIN and LNAOUT. Matching network removed from IFOUT output.
Typical Operating Characteristics(MAX2685 EV kit, VCC= VSHDN= +3V, fLNAIN= fMIXIN= 880MHz, fLO= 960MHz, PLNAIN = -30dBm, PLO= -8dBm, PMIXIN= -25dBm,
differential IFOUT operation, Zo= 50Ω, TA= +25°C, unless otherwise noted.)
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Typical Operating Characteristics (continued)(MAX2685 EV kit, VCC= VSHDN= +3V, fLNAIN= fMIXIN= 880MHz, fLO= 960MHz, PLNAIN = -30dBm, PLO= -8dBm, PMIXIN= -25dBm,
differential IFOUT operation, Zo= 50Ω, TA= +25°C, unless otherwise noted.)
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Typical Operating Characteristics (continued)(MAX2685 EV kit, VCC= VSHDN= +3V, fLNAIN= fMIXIN= 880MHz, fLO= 960MHz, PLNAIN = -30dBm, PLO= -8dBm, PMIXIN= -25dBm,
differential IFOUT operation, Zo= 50Ω, TA= +25°C, unless otherwise noted.)
MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Pin DescriptionFigure 1. Typical Operating Circuit
