TDA3845 Datasheet, PDF (2/18 Pages) NXP Semiconductors – Quasi split-sound circuit and AM demodulator

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
V_P1
V_P2
I_P
V_1-16(RMS)
V_12-13(RMS)
(S +W)/W
V_6-13(RMS)
(S +W)/W
THD
T_amb
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
1
2
%
−
+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