MAX2685 Maxim, MAX2685 Datasheet
MAX2685
Manufacturer Part Number
MAX2685
Description
Low-Cost / 900MHz / Low-Noise Amplifier and Downconverter Mixer
Manufacturer
Maxim
Datasheet
1.MAX2685.pdf
(10 pages)
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MAX2685EEE
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The 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.
19-1493; Rev 0; 7/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Cellular/Cordless Phones
Wireless Data
TOP VIEW
LNAIN
SHDN
GAIN
GND
GND
GND
V
CC
LO
________________________________________________________________ Maxim Integrated Products
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Low-Cost, 900MHz, Low-Noise Amplifier
General Description
MAX2685
QSOP
900MHz ISM-Band Radios
868MHz European ISM Band
Pin Configuration
Applications
16
15
14
13
12
11
10
9
LNAOUT
V
GND
MIXIN
GND
GND
IFOUT+
IFOUT-
CC
and Downconverter Mixer
MAX2685EEE
800MHz to 1000MHz RF Frequency Range
+2.7V to +5.5V Single-Supply Operation
Integrated LNA + Mixer + LO Buffer
Logic-Controlled LNA Bypass Switch Reduces
Supply Current
LNA Performance (High/Low Gain)
Mixer Performance (High/Low Gain)
Supply Current
<0.1µA Supply Current in Shutdown Mode
0.8µs Receiver Enable Time
Gain: +15dB/-12dB
NF: 1.4dB/12dB
Input IP3: -4dBm/+16dBm
Gain: 6dB/4.6dB
NF: 13dB/12dB
Input IP3: +7dBm/-1.5dBm
8.5mA (High Gain)
3.8mA (Low Gain)
LNAIN
SHDN
PART
GAIN
GND
V
CC
MANAGEMENT
POWER
TEMP. RANGE
-40°C to +85°C
MAX2685
LNA
Ordering Information
Functional Diagram
LNAOUT MIXIN
LNA BYPASS
BUFFER
LO
MIXER
LO
16 QSOP
PIN-PACKAGE
Features
IFOUT+
IFOUT-
1
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