TDA4445B
Features
D D D D D D
Very high input sensitivity Excellent signal to noise ratio Fast averaged AGC IF amplifier can be switched off for VTR mode Output signal stabilized against VS variations Very few external ponents
TDA4445B additional
D Targeting bistandard applications (B/G and L) D Alignment free AM demodulator D Low AM distortion
Case: DIP16
Figure 1. Block diagram TDA4445A
Figure 2. Block diagram TDA4445B
Rev. A1: 14.09.1995
1 (8)
TDA4445A/TDA4445B
Pin Description
Pin 1- 16 3 8- 9 11 12 13 2, 4, 7, 10, 14, 15 Symbol Function IF input If AGC time constant Tuned circuit Supply voltage Sound-IF-output Ground not connected
TELEFUNKEN Semiconductors
Circuit Description
This circuit includes the following functions
D Three symmetrical and gain controlled wide band amplifier stages, which are extremely stable by quasi DC coupling without feedback
D Averaged AGC with discharge control circuit D AGC voltage generator
Quasi parallel sound operation
D High phase accuracy of the...
