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TDA3845T Datasheet

Quasi split-sound circuit and AM demodulator

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INTEGRATED CIRCUITS
DATA SHEET
TDA3845; TDA3845T
Quasi split-sound circuit and AM
demodulator
Objective specification
File under Integrated Circuits, IC02
January 1993


NXP Semiconductors Electronic Components Datasheet

TDA3845T Datasheet

Quasi split-sound circuit and AM demodulator

No Preview Available !

Philips Semiconductors
Quasi split-sound circuit and AM
demodulator
Objective specification
TDA3845; TDA3845T
FEATURES
Power supply from 5 V (200 mW) to 8 V source also an
alternative 12 V source (12 V not for TDA3845T)
Gain controlled wideband IF amplifier (AC coupled with
three stages)
High precision internal 90° phase shifter for quadrature
demodulator
Amplitude detector for gain control which operates as a
peak detector for FM sound and as a mean level
detector for AM sound (switchable)
In-phase wideband synchronous demodulator for AM
detection
Stabilizer circuit for ripple rejection and constant output
signals
ESD protection for all pins
Suitable for all FM standards and L as well as L-accent
standard
NICAM compatible.
GENERAL DESCRIPTION
The TDA3845 is a quasi split-sound IF circuit which is
designed to provide high performance television FM/AM
sound.
QUICK REFERENCE DATA
SYMBOL
VP1
VP2
IP
V1-16(RMS)
V12-13(RMS)
(S +W)/W
V6-13(RMS)
(S +W)/W
THD
Tamb
PARAMETER
positive supply voltage
pin 14
pin 11 (not for TDA3845T)
supply current
minimum IF input voltage (RMS value)
IF control range
intercarrier output voltage 5.5 MHz (RMS value)
signal-to-weighted-noise ratio
(relative to 1 kHz; 50 kHz deviation)
at 5.5 MHz for 2T/20T
at 5.742 MHz for 2T/20T
AF output voltage AM (RMS value)
signal-to-weighted-noise ratio; AM mode
total harmonic distortion; AM mode
operating ambient temperature
MIN.
4.5
10.8
60
70
440
0
TYP.
MAX.
UNIT
5.0 8.8 V
12.0 13.2 V
40
mA
70 100 µV
63
dB
100
mV
60
dB
58
dB
550 660 mV
56
dB
12%
+70 °C
ORDERING INFORMATION
EXTENDED
TYPE NUMBER
TDA3845
TDA3845T
PINS
16
16
Note
1. SOT38-1; 1996 November 28.
2. SOT109-1; 1996 November 28.
PIN POSITION
DIL
SO16
PACKAGE
MATERIAL
plastic
plastic
CODE
SOT38(1)
SOT109A(2)
January 1993
2


Part Number TDA3845T
Description Quasi split-sound circuit and AM demodulator
Maker NXP
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TDA3845T Datasheet PDF





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