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參數(shù)資料
| 型號(hào)： | RF9957PCBA |
| 廠商： | RF Micro Devices, Inc. |
| 英文描述： | CDMA/FM RECEIVE AGC AND DEMODULATOR |
| 中文描述： | 碼分多址/調(diào)頻接收AGC和解調(diào)器 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 169K |
| 代理商： | RF9957PCBA |
7-30
RF9957
Rev C11 010622
7
Q
D
Pin
14
Function
IN SEL
Description
Selects between CDMA and FM mode. This is a digitally controlled
input. A logic “high” (
≥
VCC-0.7V
DC
) selects CDMA mode. A logic “l(fā)ow”
(<0.5V
DC
) selects FM mode. In FM mode, ONLY the I mixer is active.
There is no Q output in FM mode. The impedance on this pin is 30k
.
Interface Schematic
15
Q OUT-
Balanced Baseband Output of Q Mixer. This pin is internally DC biased
and should be DC blocked externally. This output is active in CDMA
mode, but is NOT active in FM mode. The output can be used in a sin-
gle-ended configuration by leaving one of the two pins unconnected,
however half the output voltage will be lost. Each pin should be loaded
with 2.5k
. The balanced load should be 5k
. The single-ended output
impedance is 1k
, while the balanced output impedance is 2k
.
16
17
18
Q OUT+
GND
FL-
Same as pin 15, except complementary output.
See pin 15.
Same as pin 6.
Balanced AGC Output/Demod Input. This balanced node is pinned out
to allow shunt filtering of the AGC output signal as it enters the demod-
ulator. The basic configuration of the filter should consist of a shunt
inductor and shunt capacitor, both connected to the power supply, as
the internal circuitry requires this power supply connection through the
inductor to operate.
19
20
21
FL+
GND
I OUT+
Same as pin 18, except complementary.
See pin 18.
Same as pin 6.
Balanced Baseband Output of I Mixer. This pin is internally DC biased
and should be DC blocked externally. This output is active in both
CDMA and FM modes. The output can be used in a single-ended con-
figuration by leaving one of the two pins unconnected, however half the
output voltage will be lost. Each pin should be loaded with 2.5k
. The
balanced load should be 5k
. The single-ended output impedance is
1k
, while the balanced output impedance is 2k
.
22
23
I OUT-
GC
Same as pin 21, except complementary output.
See pin 22.
Analog Gain Control for AGC Amplifiers. The valid control range is from
0.5 to 2.5V
DC
. These voltages are valid for ONLY a 37k
source
impedance. The gain range for the AGC is 95dB.
60 k
BIAS
IN SEL
60 k
1 k
1 k
V
CC
V
CC
Q OUT+
Q OUT-
1.2 k
1.2 k
V
CC2
V
CC2
FL+
FL-
V
CC1
V
CC1
1 k
1 k
V
CC
V
CC
I OUT+
I OUT-
21 k
BIAS
40 k
GC
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