參數(shù)資料
型號: RF2667
廠商: RF MICRO DEVICES INC
元件分類: 無繩電話/電話
英文描述: RECEIVE AGC AND DEMODULATOR
中文描述: TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO24
封裝: PLASTIC, QSOP-24
文件頁數(shù): 4/10頁
文件大?。?/td> 129K
代理商: RF2667
7-4
RF2667
Rev A14 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. 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 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
1.2k
, while the balanced output impedance is 2.4k
.
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
1.2k
, while the balanced output impedance is 2.4k
.
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
1.2 k
1.2 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
1.2 k
1.2 k
V
CC
V
CC
I OUT+
I OUT-
21 k
BIAS
40 k
GC
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PDF描述
RF2668 CDMA/FM TRANSMIT MODULATOR, IF AGC, AND UPCONVERTER WITH INTEGRATED PLL
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RF2689 W-CDMA/GSM/DCS RECEIVE AGC AND DEMODULATOR
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