STV0056AF View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV0056AF' PDF : 27 Pages View PDF
STV0056AF
PIN INTERNAL CIRCUITRY (continued)
PK OUT R, PK OUT L
Figure 8
VDD 9V 3.4V
Clamp
Audio
1
Peak Detector
1
5kΩ
Pins 51 - 52
PK OUT R
PK OUT L
FC L, FC R
Ivar is controlled by the peak det audio level max.
±15µA (1VPP audio).
Figure 9
Pin 55 - 57
FC L - FC R
VDD 9V
1
1
Ivar
VOL OUT R, VOL OUT L
Audio output with volume and scart driver with
+12dB of gain for up to 2VRMS. The opamp has a
push-pull output stage.
Figure 10
Audio
2.4V Bias
30kΩ
30kΩ
15kΩ
Pins 62 - 3
VOL OUT R
VOL OUT L
4.8V
GND 0V
S2 OUT L, S2 OUT R, S3 OUT L, S3 OUT R
Same as above but with gain fixed at +6dB.
Figure 11
Audio
2.4V Bias
20kΩ
Pins 5 - 7 - 23 - 24
S2 OUT L
S2 OUT R
S3 OUT L
S3 OUT R
GND 0V
S2 RTN L, S2 RTN R, S3 RTN L, S3 RTN R
4.8V bias voltage is the same as the bias level on
the audio outputs.
Figure 12
Pins 17 - 18 - 20 - 21
S2 RTN L - S2 RTN R
S3 RTN L - S3 RTN R
4.8V
25kΩ
50µA
FM IN
The otherinput for each channelis internallybiased
in the same way via 10kΩ to the 2.4V VREF.
Figure 13
2.4V
FM IN 19
10kΩ
Left Channel
50µA
10kΩ
Right Channel
50µA
IREF
The optimum value if IREF is 50µA ±2% so an
external resistor of 47.5kΩ ±1% is required.
Figure 14
2.4V
1
50 IREF
I/O / 22kHz
The input is TTL compatible.
The output is tri-stateable.
Figure 15
MUX
22kHz
180µ/2µ
100µ/2µ
I/O/22kHz
25
205Ω
ESD
10µ/2µ
IIC Reg
91µ/2µ
SCL
This is the input to a Schmitt input buffer made with
a CMOS amplifier.
Figure 16
SCL 26
205Ω
ESD
24µ/4µ
15/27
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