cxa2074q Sony Electronics, cxa2074q Datasheet - Page 24

• Manufacturer Part Number: cxa2074q
• Description: Us Audio Multiplexing Decoder
• Manufacturer: Sony Electronics

(6) Matrix, TVSW, PASSSW
(7) Sound processor block
(8) Others
Standard input and output levels
1
2
3
COMPIN
AUX1-L/AUX1-R
AUX2-L/AUX2-R
LPIN-L/LPIN-R
MONO, 25kHz Deviation, Pre-Em. off
MONO, 25kHz Deviation, Pre-Em. on
VOLUME MAX, BASS & TREBLE CENTER
The variable de-emphasis circuit transmittance and VCA gain are respectively controlled by Each of
effective value detection circuits. Each of the effective value detection circuits passes the input signal
through a predetermined filter for weighting before the effective value of the weighted signal is
detected to provide the control signal.
The signals (L + R, L – R, SAP) input to “MATRIX” become the outputs for the ST-L, ST-R, MONO and
SAP signals according to the BUS data and whether there is ST / SAP discrimination.
“TVSW” switches the “MATRIX” output signal, external input signal (input to AUX1-L, R), external input
signal (input to AUX2-L, R) and external forced MONO.
“PASSSW” switches the “TVSW” output signal and external input signal (input to LPIN-L, R).
The sound processor block contains, “BASS/TREBLE” tone control functions, and “VOLUME”.
“MVCA” is a VCA which adjusts the input signal level to the standard level of this IC.
“Bias” supplies the reference voltage and reference current to the other blocks. The current flowing to
the resistor connecting IREF (Pin 19 (Pin 16)) with GND become the reference current.
Input pin
BASS:
TREBLE: ±12dB (±1.7dB/STEP at 10kHz)
VOLUME: 0 to –80dB (–1.25dB/STEP)
±12dB (±1.7dB/STEP at 100Hz)
Pin No.
36/35
38/37
42/41
(14)
17
245mVrms
490mVrms
490mVrms
490mVrms
Input level
1
– 24 –
LPOUT output level
490mVrms
490mVrms
490mVrms
—
2
LSOUT output level
490mVrms
490mVrms
490mVrms
490mVrms
2
3
CXA2074Q/S