STV0042 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV0042' PDF : 24 Pages View PDF
STV0042A
PIN INTERNAL CIRCUITRY (continued)
FC L, FC R
Ivar is controlled by the peak det audio level max.
±15µA (1VPP audio).
Figure 9
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
4.8V
VOL OUT R
VOL OUT L
15kΩ
GND 0V
S2 OUT L, S2 OUT R
Same as above but with gain fixed at +6dB.
Figure 11
Audio
2.4V Bias
20kΩ
S2 OUT L
S2 OUT R
20kΩ
GND 0V
S2 RTN L, S2 RTN R
4.8V bias voltage is the same as the bias level on
the audio outputs.
Figure 12
25kΩ
S2 RTN L
4.8V
S2 RTN R
1
50µA
FM IN
The otherinput for each channelis internallybiased
in the same way via 10kΩ to the 2.4V VREF.
Figure 13
FM IN
2.4V
10kΩ
10kΩ
Right Channel
Left Channel
1
50µA
1
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
IREF
SCL
This is the input to a Schmitt input buffer made with
a CMOS amplifier.
Figure 15
205Ω
SCL
24µ/4µ
ESD
SDA
Input same as above. Output pull down only : relies
on external resistor for pull-up.
Figure 16
SDA 205Ω
600µ/2µ ESD
GND 0V
24µ/4µ
U75 L, U75 R
I1 - I2 = 2 x audio / 18kΩ. eg 1VPP audio : ±55µA.
The are internal switches to match the audio level
of the different standards.
Figure 17
I1
U75 L
U75 R
I2
13/24
Share Link: 
