RF2667 RF Micro Devices, RF2667 Datasheet - Page 4

• Manufacturer Part Number: RF2667
• Description: RECEIVE AGC AND DEMODULATOR
• Manufacturer: RF Micro Devices

7
7-4
Pin
14
15
16
17
18
19
20
21
22
23
RF2667
Function
Q OUT+
Q OUT-
IN SEL
I OUT+
I OUT-
GND
GND
FL+
FL-
GC
Description
Selects between CDMA and FM mode. This is a digitally controlled
input. A logic “high” ( VCC-0.7V
(<0.5V
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 .
Same as pin 15, except complementary output.
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.
Same as pin 18, except complementary.
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 .
Same as pin 21, except complementary output.
Analog Gain Control for AGC Amplifiers. The valid control range is from
0.5 to 2.5V
impedance. The gain range for the AGC is 95dB.
DC
) selects FM mode. The impedance on this pin is 30k .
DC
. These voltages are valid for ONLY a 37k
DC
) selects CDMA mode. A logic “low”
source
Interface Schematic
See pin 15.
See pin 18.
See pin 22.
V
CC2
IN SEL
1.2 k
GC
V
V
CC
CC
V
1.2 k
1.2 k
CC2
1.2 k
BIAS
V
V
FL-
BIAS
CC
CC
60 k
Rev A14 010622
60 k
1.2 k
1.2 k
21 k
40 k
FL+
V
CC1
Q OUT+
Q OUT-
I OUT+
I OUT-
V
CC1