RF2642PCBA41X Ver la hoja de datos (PDF) - RF Micro Devices
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RF2642PCBA41X Datasheet PDF : 10 Pages
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RF2642
Pin
10
11
12
13
14
15
16
Pkg
Base
Function
IF-
IF+
GND
LO-
Description
Interface Schematic
Balanced IF Input Pin. This pin is internally DC-biased and should be
DC-blocked if connected to a device with a DC level present. For single- IF+
IF-
ended input operation, one pin is used as an input and the other IF
input is AC coupled to ground. The input impedance is 250Ω in both
the balanced and single-ended modes.
BIAS
Same as pin 10, except complementary input.
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
Balanced LO Input Pin. This pin is internally DC-biased and should be
DC-blocked if connected to a device with a DC level present. For single- LO+
LO
ended input operation, one pin is used as an input and the other LO
input is AC coupled to ground. The input impedance is 50Ω in both the
balanced and single-ended modes.
BIAS
LO+
VCC
GAIN
SELECT
GND
Same as pin 13, except complementary input.
Supply voltage for all bias circuits and logic circuits.
When GAIN SELECT is high: the driver amplifier is switched to high
gain mode; both amplifier stages are active; the gain is maximized;
and, the entire device draws approximately 51mA. When GAIN
SELECT is low, the second stage of the PA driver is turned off and
bypassed. This results in a device current of 26mA, which is approxi-
mately a 50% current reduction. The upconverting mixer remains on in
both the high and low gain modes to prevent VCO pulling.
Ground connection. The backside of the package should be soldered to
a top side ground pad which is connected to the ground plane with mul-
tiple vias.
PD
Gain
Select
Mixer
Amplifier
Amplifier
First Stage Second Stage
0
0
ON
OFF
OFF
0
1
ON
OFF
OFF
1
0
ON
ACTIVE
BYPASSED
1
1
ON
ACTIVE
ACTIVE
*See parameter specifications for conditions.
Gain
(dB)*
11.9
34.5
6-52
Rev A8 060925
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