TA1274F
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA1274F
PIF / SIF SYNCHRONOUS DEMODULATOR IC
FEATURES
·
Compatible pin assignment to TA1267AF
PIF CIRCUIT
·
True synchronous PIF demodulator
·
3-stages gain controlled PIF amplifier
·
High speed response PIF AGC detector
·
Buzz reducer
·
Equalizer for video output
·
AFT detector without extra reference circuit
SIF CIRCUIT
·
Wide range gain controlled SIF amplifier
(control range : 70dB typ.)
·
Alignment-free PLL-FM demodulator
Weight: 0.27 g (typ.)
1
2002-12-20
TA1274F
BLOCK DIAGRAM
2
2002-12-20
TA1274F
TERMINAL FUNCTION
PIN
No.
NAME
FUNCTION
INTERFACE CIRCUIT
1
24
PIF input
Differential type inputs.
Typical input level is 85 dBµV.
2
RF AGC output
Open collector (PNP) type output.
Maximum output current is 0.5 mA.
3
AGC filter
Connect a capacitor (0.47 µF) between
GND.
4
5
EQ amplifier output
EQ filter
No.4 terminal is EQ amplifier output.
Maximum output current of this
terminal is 5 mA.
No.5 terminal is for EQ filter.
6
N.C.
―
7
Bias filter
Connect a capacitor (10 µF) between
GND.
3
2002-12-20
TA1274F
PIN
No.
NAME
FUNCTION
INTERFACE CIRCUIT
8
EQ amplifier input
EQ amplifier inputs.
9
APC filter
Connect a resister (330
Ω)
and a
capacitor (0.47 µF) between GND in
series. And connect a capacitor (1000
pF) between this terminal and GND.
Sensitivity of phase detector is 400 µA
/ rad (Typ.), and sensitivity of VCO is
1.8 MHz / V (Typ.).
10
Video output
Connect a resister (1 kΩ) between
GND.
Maximum output current is 10 mA.
11
2 nd SIF output
2 nd SIF signal is outputted from this
terminal.
12
FM demodulating filter
Connect a capacitor (2.2 µF) between
GND.
4
2002-12-20
TA1274F
PIN
No.
NAME
FUNCTION
INTERFACE CIRCUIT
13
RF AGC delay adj.
This terminal is for RF AGC delay
point adjustment.100 µA current is
outputted from this terminal. Connect
a resister (5.6 kΩ) and a volume (10
kΩ) between GND in series.
14
AFT Defeat SW
This terminal is AFT defeat switch.
To open this terminal, AFT function is
activate.
To connect GND this terminal, AFT
function is not activate. And terminal
No.20 goes to 1 / 2 V
CC
.
15
(No function)
This terminal must be connected to
V
CC
.
―
16
2 nd SIF input
This terminal 2nd SIF input.
This terminal must be decoupled
outer circuit on D.C.
17
AF output
Output resistance of this terminal is
7.5 kΩ.
18
19
VCO tank
Connect tank for VCO between these
terminals.
Capacitance of the VCO tank is 27 pF.
5
2002-12-20
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