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IC, TB31224F
Pin No.
Pin Name
I/O
Description
TX-IN
VCC3
LO-1, LO-2
SIG OUT
CLK
DATA
STB
FIL-OUT
FIL-IN
COMP-OUT
C-NF
MIC-OUT
MIC-IN
PRE-IN
PRE-OUT
EXP-OUT
RECE-IN
RO1
RO2
BAT-ALM
RSS1
IF-OUT
GND1
DEC
IF-IN
VCC1
2ND MIX-OUT
I
—
O
O
I
I
I
O
I
O
—
O
I
I
O
O
I
O
O
O
O
I
I
I
O
—
I
I
—
O
Input terminal of TX VCO oscillation signal.
Power supply terminal.
LOCAL OSCILLATOR input and output terminals. Colpitts oscillator is formed by
internal emitter follower and external X’tal. And external injection is possible from pin
3.
Output terminal of detection signal. It is the open drain output.
Input terminal of clock.
Input terminal of serial data.
Input the serial data for controlling IC.
Input terminal of strobe signal.
Output of FILTER AMP.
Input of FILTER AMP.
Output of COMPRESSOR.
Feedback circuit of T type is formed by external capacitor with SUM AMP.
Output of MIC AMP and connected directly to input of SUM AMP.
Input terminal of MIC AMP.
Inverted input of PRE AMP.
Output of PRE AMP. Connected directly to EXPANDER.
Output of SUM AMP at EXPANDER. The signal from gain cell is gained by inverted
amp.
Inverted input of RECEIVER AMP.
Receiving output for a dynamic receiver.
Used for BTL output type with RO1 terminal when a ceramic receiver is used.
BATTERY ALARM terminals. When VCC decrease VBAT-L, This terminal outputs
“H” level. Detection voltage is controlled by data bit. This terminal is open collector
output.
This terminal outputs DC level according to input signal level to IF AMP. Dynamic
range is around 70dB.
Output terminal for wave form shaping. This terminal is open collector output.
DATA COMPARATOR input terminal. This terminal input demodulation signal of
DATA.
NOISE FILTER input and output terminals. BPF is composed of external capacitors
and resistors. Connected internally to rectifier circuit by coupling capacitor.
Demodulated signal output terminal. Carrier leak is small as LPF is built-in. Output
impedance is around 360
Ω
.
Phase shift signal input terminal of FM demodulator.
Output terminal of IF AMP.
GND terminal.
2nd IF input and decoupling for bias. Input impedance is around 1.5k
Ω
.
Power supply terminal.
MIX output terminal. Output impedance is around 1.5k
Ω
.
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