MAX2685EEE+T Maxim Integrated Products, MAX2685EEE+T Datasheet - Page 6

• Manufacturer Part Number: MAX2685EEE+T
• Description: RF Amplifier IC MIXER DOWN CONVERTER
• Manufacturer: Maxim Integrated Products
• Type: General Purpose Amplifierr

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

Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Figure 1. Typical Operating Circuit
6
11, 12, 14
1, 3, 8,
5, 15
_______________________________________________________________________________________
PIN
10
13
16
2
4
6
7
9
*OPTIONAL FOR BROADBAND MATCH.
LNAOUT
880MHz
960MHz
IFOUT+
IFOUT-
NAME
LNAIN
SHDN
INPUT
INPUT
MIXIN
GAIN
GND
V
LNA
LO
SHUTDOWN
CC
LO
CONTROL
INPUT
INPUT
GAIN-
0.1µF
V
Ground. Connect to ground plane with a low-inductance connection.
RF Input to LNA and LNA Bypass Switch. Requires an external matching network and a series
DC-blocking capacitor.
Gain Control Logic-Level Input. Drive high to enable the LNA, open the LNA bypass switch, and
increase the receiver’s gain. Drive low to disable the LNA, close the LNA bypass switch, and reduce
the receiver’s gain.
Supply Voltage. Bypass V
Shutdown Control Logic-Level Input. Drive high or connect to V
place the device in low-power shutdown mode.
Local-Oscillator Input to Downconverter Mixer. Requires a series DC-blocking capacitor and an imped-
ance-setting resistor (typically 75Ω to ground).
Inverting Side to Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up induc-
tor to V
Noninverting Side of Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up
inductor to V
RF Input to Downconverter Mixer. Requires an external matching network and series DC-blocking
capacitor.
LNA Output. Internally matched to 50Ω. LNAOUT has an internal blocking capacitor.
CC
75Ω
CC
12nH
330pF
for proper biasing, as well as a matching network to ensure optimum output power.
CC
47pF
for proper biasing, as well as a matching network to ensure optimum output power.
1
2
3
4
5
6
7
8
CC
GND
GAIN
V
SHDN
LO
GND
LNAIN
GND
CC
to GND at each pin with a 47pF capacitor as close to the pin as possible.
MAX2685
LNAOUT
IFOUT+
IFOUT-
MIXIN
GND
GND
GND
V
CC
FUNCTION
16
15
14
13
12
11
10
9
R*
3.3pF
680nH
47pF
V
300pF
CC
6pF
CC
300pF
6pF
for normal operation. Drive low to
820nH
12pF
Pin Description
1000pF
LNA
OUTPUT
MIXER
INPUT
880MHz
IF
OUTPUT
80MHz
V
CC