TDA3857 查看數據表（PDF） - Philips Electronics

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TDA3857

Quasi-split sound processor with two FM demodulators

Philips Electronics 

Philips Semiconductors

Quasi-split sound processor with two

FM demodulators

Product specification

TDA3857

FEATURES

• Quasi-split sound processor for all FM standards e. g. B/G

• Reducing of spurious video signals by tracking function and AFC for the vision carrier reference circuit; (recommended

for NICAM)

• Automatic muting of the AF2 signal by the input level

• Stereo matrix correction

• Layout-compatible with TDA3856 (24 pins) and TDA3858 (32 pins).

GENERAL DESCRIPTION

Symmetrical IF inputs. Gain controlled wideband IF amplifier.

AGC generation due to peak sync. Reference amplifier for the regeneration of the vision carrier. Optimized limiting

amplifier for AM suppression in the regenerated vision carrier signal and 90° phase shifter.

Intercarrier mixer for FM sound, output with low-pass filter.

Separate signal processing for 5.5 and 5.74 MHz intercarriers. Wide supply voltage range, only 300 mW power

dissipation at 5 V.

QUICK REFERENCE DATA

SYMBOL

VP

IP

Vi IF

Vo AF

THD

S/N (W)

PARAMETER

supply voltage (pin 19)

supply current

IF input sensitivity (−3 dB)

audio output signal (RMS value)

total harmonic distortion

weighted signal-to-noise ratio

MIN.

4.5

−

−

−

−

−

TYP.

5

60

70

1

0.5

68

MAX. UNIT

8.8 V

72

mA

100 µV

−

V

−

%

−

dB

ORDERING INFORMATION

EXTENDED

TYPE NUMBER

PINS

TDA3857

20

Note

1. SOT 146-1; 1996 November 28.

PIN

POSITION

DIL

PACKAGE

MATERIAL

plastic

CODE

SOT146(1)

June 1994

2

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