TDA4445B (Quasi Parallel Sound Processor)
(1) Features
• 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 supply voltage variations
• Very few external components
• Targeting bistandard applications
• Low AM distortion
(2) General Description
The TDA4445B is quasi parallel sound processor with quadrature intercarrier demodulator.
(3)Block Diagram
(4)Pin Description
PIN
DESCRIPTION
1, 16
IF input
3
IF AGC time constant
8, 9
Tuned circuit
11
Supply voltage
12
Sound-IF-output
13
Ground
2,4,7,10
not be connected
14,15
5
Average capacitor
6
AF output
38