MAX2685EEE+T Maxim Integrated Products, MAX2685EEE+T Datasheet

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MAX2685EEE+T

Manufacturer Part Number
MAX2685EEE+T
Description
RF Amplifier IC MIXER DOWN CONVERTER
Manufacturer
Maxim Integrated Products
Type
General Purpose Amplifierr
Datasheet
1.MAX2685EEE.pdf (10 pages)

Specifications of MAX2685EEE+T

Operating Frequency
1000 MHz
Noise Figure
1.4 dB at 880 MHz
Operating Supply Voltage
3 V, 5 V
Supply Current
8.5 mA
Maximum Power Dissipation
667 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
QSOP-16
Minimum Operating Temperature
- 40 C
Number Of Channels
1 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 1; 12/00
Cellular/Cordless Phones
Wireless Data
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
LNAIN
SHDN
GAIN
GND
GND
V
GND
CC
LO
________________________________________________________________ Maxim Integrated Products
1
2
6
3
4
5
7
8
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
GND
MIXIN
GND
GND
IFOUT+
IFOUT-
V
CC
and Downconverter Mixer
o 800MHz to 1000MHz RF Frequency Range
o +2.7V to +5.5V Single-Supply Operation
o Integrated LNA + Mixer + LO Buffer
o Logic-Controlled LNA Bypass Switch Reduces
o LNA Performance (High/Low Gain)
o Mixer Performance (High/Low Gain)
o Supply Current
o <0.1µA Supply Current in Shutdown Mode
o 0.8µs Receiver Enable Time
MAX2685EEE
Supply Current
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
V
GND
CC
MANAGEMENT
POWER
TEMP. RANGE
-40°C to +85°C
MAX2685
Ordering Information
LNA
Functional Diagram
LNAOUT MIXIN
LNA BYPASS
BUFFER
LO
MIXER
LO
16 QSOP
PIN-PACKAGE
Features
IFOUT+
IFOUT-
1

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MAX2685EEE+T Summary of contents

Page 1

... MAX2685 SHDN GND QSOP ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. and Downconverter Mixer o 800MHz to 1000MHz RF Frequency Range o +2.7V to +5.5V Single-Supply Operation o Integrated LNA + Mixer + LO Buffer o Logic-Controlled LNA Bypass Switch Reduces ...

Page 2

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC LNAIN Input Power (50Ω source)...................................+10dBm LO Input Power (50Ω source) ........................................+10dBm MIXIN Input Power (50Ω source) ...................................+10dBm IFOUT+, IFOUT- to GND ..........................................-0.3V to ...

Page 3

Low-Cost, 900MHz, Low-Noise Amplifier AC ELECTRICAL CHARACTERISTICS (continued) (MAX2685 EV kit +3V, f SHDN CC differential IFOUT operation 50Ω PARAMETER Mixer Conversion Gain Variation over Temperature Mixer Noise Figure (SSB) Mixer Input ...

Page 4

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer (MAX2685 EV kit +3V, f SHDN CC LNAIN differential IFOUT operation 50Ω LNA INPUT IP3 vs. SUPPLY VOLTAGE +25°C GAIN = LOW ...

Page 5

Low-Cost, 900MHz, Low-Noise Amplifier (MAX2685 EV kit +3V, f SHDN CC differential IFOUT operation 50Ω MIXER GAIN vs. IF FREQUENCY 8 6 GAIN = HIGH GAIN = LOW ...

Page 6

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer PIN NAME GND Ground. Connect to ground plane with a low-inductance connection. 11, 12 Input to LNA and LNA Bypass Switch. Requires an external matching network and a ...

Page 7

Low-Cost, 900MHz, Low-Noise Amplifier Detailed Description The MAX2685 consists of five major components: a low-noise amplifier (LNA), an LNA bypass switch, a downconverter mixer, a local-oscillator (LO) buffer, and a power-management block. Low-Noise Amplifier (LNA) The LNA is a wideband, ...

Page 8

Low-Cost, 900MHz, Low-Noise Amplifier and Downconverter Mixer Table 2. Mixer Typical S-Parameters (V RF FREQUENCY S11 (MHz) MAG High-Gain Mode (GAIN = 800 0.355 840 0.352 880 0.351 920 0.349 960 0.352 1000 0.353 Low-Gain Mode (GAIN ...

Page 9

Low-Cost, 900MHz, Low-Noise Amplifier Local-Oscillator Input The LO port is the high-impedance input of the local- oscillator buffer. It requires a series DC-blocking capacitor and a shunt resistor to ground to set the input impedance. See the Typical Operating Characteristics ...

Page 10

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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