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STV0056A View Datasheet(PDF) - STMicroelectronics

Part Name
Description
MFG CO.
STV0056A
ST-Microelectronics
STMicroelectronics ST-Microelectronics
'STV0056A' PDF : 26 Pages View PDF
STV0056A
PIN INTERNAL CIRCUITRY (continued)
VID IN
Figure 7
VREF 2.4V
10k
VID IN
6.5k
+
0.5pF
GND 0V
1
85µA
PK OUT R, PK OUT L
Figure 8
Audio
VDD 9V
1
3.4V
Peak Detector
1 5k
Clamp
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
VDD 9V
FC L
FC R
Ivar
1
1
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
30k
30k
4.8V
VOL OUT R
VOL OUT L
15k
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
20k
S2 OUT L
S2 OUT R
S3 OUT L
S3 OUT R
20k
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
S2 RTN L
S2 RTN R
S3 RTN L
S3 RTN R
4.8V
25k
1
50µA
FM IN
The other input for each channel is internally biased
in the same way via 10kto the 2.4V VREF.
Figure 13
FM IN
2.4V
10k
10k
Left Channel
1
Right Channel
50µA
1
50µA
IREF
The optimum value if IREF is 50µA ±2% so an
external resistor of 47.5k±1% is required.
Figure 14
2.4V
1
IREF
14/26
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