400MHz to 2.5GHz, Low-Noise,
SiGe Downconverter Mixers
Typical Operating Characteristics (continued)
(Typical Operating Circuit, V CC = SHDN = +3.0V, P RFIN = -25dBm, P LO = -5dBm, T A = +25°C, unless otherwise noted.)
SHDN
2V/div
IFOUT
50mV/
div
MAX2680
TURN-OFF/ON CHARACTERISTICS
Z1 = 39pF
500ns/div
SHDN
2V/div
IFOUT
50mV/
div
MAX2681
TURN-OFF/ON CHARACTERISTICS
Z1 = 39pF
500ns/div
SHDN
2V/div
IFOUT
50mV/
div
MAX2682
TURN-OFF/ON CHARACTERISTICS
Z2 = 39pF
500ns/div
Pin Description
PIN
1
2
3
4
5
6
NAME
LO
GND
RFIN
IFOUT
V CC
SHDN
FUNCTION
Local-Oscillator Input. Apply a local-oscillator signal with an amplitude of -10dBm to 0 (50 ? source). AC-
couple this pin to the oscillator with a DC-blocking capacitor. Nominal DC voltage is V CC - 0.4V.
Mixer Ground. Connect to the ground plane with a low-inductance connection.
Radio Frequency Input. AC-couple to this pin with a DC-blocking capacitor. Nominal DC voltage is 1.5V.
See Applications Information section for details on impedance matching.
Intermediate Frequency Output. Open-collector output requires an inductor to V CC . AC-couple to this pin
with a DC-blocking capacitor. See Applications Information section for details on impedance matching.
Supply Voltage Input, +2.7V to +5.5V. Bypass with a capacitor to the ground plane. Capacitor value
depends upon desired operating frequency.
Active-Low Shutdown. Drive low to disable all device functions and reduce the supply current to less than
5μA. For normal operation, drive high or connect to V CC .
8
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