Audio Amplifier TNP107172 with STK4392
Tuner + if stages TNP107701
Teletext + A/V switch TNP107601
TDA3803A Stereo/dual TV sound decoder circuit
GENERAL DESCRIPTION
The TDA3803A is a stereo/dual TV sound decoder circuit with static switching for processing two AF signals in TV and
VCR equipment. The LOW/HIGH static switching signals control the AF output selector. Two operational amplifiers
perform bandpass filtering of the identification signals.
Features
· Amplification of the two AF input signals by integrated operational amplifiers
· Low distortion stereo de-matrix
· All operational amplifiers offset compensated
· De-emphasis with operational amplifiers, preferably applied to the output terminals
· Two output ports each with two channels for headphones and loudspeakers
· Dual sound information at one port, each port individually switchable from sound I to sound II and sound II to sound I
· Mute function; while mute is active, it is possible to connect an external mono AF input signal to pin 10 appearing at
pins 20 to 23.
· Identification without additional signals (horizontal etc.)
Supply voltage (pin 13) VP = V13-12 typ. 12 V
Supply current (pin 13) IP = I13 typ. 28 mA
Pilot carrier amplifier gain control range DGv > 40 dB
A.F. input signals; at Gv = 0 dB
(r.m.s. value) Vi(rms) = 1 V
LED output current ILED typ. 12 mA
Weighted signal-to-noise ratio
of the a.f. signal switches (CCIR468/2) (S+N)/N ³ 60 dB
Crosstalk in stereo mode aS > 40 dB
Crosstalk in dual sound mode a > 60 dB.
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