TA2057N Datasheet PDF - Toshiba


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TA2057N
Toshiba

Part Number TA2057N
Description AM/FM IF+FM ST DET (FOR DIGITAL TUNING SYSTEM)
Page 19 Pages

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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2057N
AM / FM IF + FM St DET (for digital tuning system)
TA2057N
TA2057N is the AM / FM IF + FM St DET system IC, which is
designed for DTS radios.
This IC is included many functions and these can be used for
digital tuning system with IF counter.
Features
· Suitable for combination with digital tuning system which has
IF counter.
· One terminal type AM / FM IF count output (auto stop signal)
for IF counter of digitl tuning system.
· Builtin mute circuit for IF count output.
Weight: 1.2g (typ.)
· Adjustable for IF count output sensitivity by external resistance of pin(2) (AM), and pin(3) (FM).
· For adopting ceramic discriminator and ceramic resonator, it is not necessary to adjust the FM quad detector
circuit and FM st DET vco circuit.
· Builtin AM local oscillator buffer output circuit.
· Builtin AM IF buffer output circuit for AM stereo.
· Operating supply voltage range (Ta = 25°C): VCC = 3.5~14V
Handle with care to prevent devices from deteriorations by static electricity.
1 2002-10-30



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Block Diagram
TA2057N
2 2002-10-30



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TA2057N
Terminal Explanation (terminal voltage shows typical value at Ta = 25°C, VCC = 5V,
SW3 = off, SW9 = GND, and non-signal test circuit)
Pin
No. Characteristic
Internal Circuit
DC Voltage (V)
FM AM
1 AM RF in
1.95 1.95
AM ssens
AM IF count output sensitivity adjust
terminal
2 Bias terminal for AM IF / DET out
switch circuit
V2 = GND AM DET out (pin(19))
V2 = Vstb AM IF out (pin(19))
FM ssens
3 FM IF count output sensitivity
adjust terminal
0.5
(at SW9 =
Vstb1.45)
R2 = 10k
0.5
(at SW9 =
Vstb1.45)
R2 = 10k
00
R3 = 10kR3 = 10k
3 2002-10-30



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Pin
No. Characteristic
4 AM OSC
Internal Circuit
TA2057N
DC Voltage (V)
FM AM
1.95 1.95
5 AM OSC out
6 VCC
7 AGC
8 GND
IF out / REQ
IF count output terminal
9
IF count output / FM st DET mute circuit
control terminal
V9 = VCC on
V9 = open off
5.0 4.75
5.0 5.0
0.01 0.01
00
――
4 2002-10-30




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