32
Pin No.
Pin Name
I/O
Description
35
36
37
38
39
40
41
42
43, 44
45
46
47
48
N-REC
2ND MIX-IN
E-RECT
1ST MIX-OUT
VREF
1ST MIX-IN
VCC2
VCO-CONT
VCO-1, VCO-2
C-RECT
RX-OUT
TX-OUT
GND2
O
I
O
O
—
I
—
I
I
—
O
O
—
After output of NOISE FILTER amplified around 20dB, noise signal is rectified by
external capacitor.
1st IF signal input terminal. Input impedance is around 4.7k
Ω
at 10.695MHz.
Connected capacitor for full-wave rectifier circuit of EXPANDER.
MIX output terminals. Externally connects filters. Output impedance is 330
Ω
. (Typ.)
Reference terminal through internal buffer of compander block.
MIX input terminal. Double-balance MIX.
Regulator terminal. Output voltage is 2.0V.
Voltage control terminal of RX-VCO.
They are resonance terminals of RX-VCO.
Terminal for rectifier of COMPRESSOR. Almost the same circuit as E-RECT
terminal.
Output terminal of CHARGE PUMP. CHARGE PUMP is constant current output
circuit, and output current is varied by input serial data.
GND terminal.
1. General description
TB31224F is controlled by serial parts pin 6, 7, 8, and makes all situations by these serial bits for RF part in 46/49MHz cordless
telephone such as intermittent receiving state.
Not only 46/49MHz cordless telephone but CT0 cordless phone that has frequency spec. between about 20MHz and 60MHz can
be also set up TB31224F.
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
