ViewSonic VG720 - 17" LCD Monitor Service Manual page 20

PIN Function
TERMINAL
NO. NAME
AGND 9,10,26
AVcc 33
AV 29
DD
AV REF 7
DD
BSLN 13
BSLP 24
BSRN 48
BSRP 37
COSC 28
FADE 30
LINN 6
LINP 5
LOUTN 16,17
LOUTP 20,21
MUTE 34
NC 31,32,35
PGNDL 18,19
PGNDR 42,43
PVVCCL 14,15
PVVCCL 22,23
PVCCR 38,39
PVCCR 46,47
REFGND 12
RINP 3
RINN 2
ROSC 27
ROUTN 44,45
ROUTP 40,41
SD 1
VCLAMPL 25
VCLAMPR 36
VOLUME 11
VREF 8
V2P5 4
ViewSonic Corporation
I/O
-
Analog ground for digital/analog cells in core
-
High-voltage analog power supply (8.5V to 14V)
O
5-V Regulated output
O
5-V Reference output-provided for connection to adjacent VREF terminal.
I/O
Bootstrap I/O for left channel, negative high-side FET
I/O
Bootstrap I/O for left channel, positive high-side FET
I/O
Bootstrap I/O for right channel, negative high-side FET
I/O
Bootstrap I/O for right channel, positive high-side FET
I/O for charge/discharging currents onto capacitor for ramp generator triangle wave
I/O
biased at V2P5
Input for controlling volume ramp rate when cycling
I
low on this pin places the amplifier in fade mode. A logic
high on this pin allows a quick transition to the desired volume setting.
I
Negative differential audio input for left channel
I
Positive differential audio input for left channel
O
Class-D 1/2-H-bridge negative output for left channel
O
Class-D 1/2-H-bridge positive output for left channel
I
A logic high on this pin disables the outputs. A low on this pin enables the outputs.
-
Not internally connected
-
Power ground for left channel H-bridge
-
Power ground for right channel H-bridge
Power supply for left channel H-bridge(tied to pins 22 and 23 internally), not
-
connected to PVCCR or AVcc
Power supply for left channel H-bridge(tied to pins 14 and 15 internally), not
-
connected to PVCCR or AVcc
Power supply for right channel H-bridge(tied to pins 46 and 47 internally), not
-
connected to PVCCL or AVcc
Power supply for right channel H-bridge(tied to pins 38 and 39 internally), not
-
connected to PVCCL or AVcc
Ground for gain control circuitry. Connect to AGND. If using a DAC to control the
-
volume, connect the DAC ground to this terminal.
I
Positive differential audio input for right channel
I
Negative differential audio input for right channel
I/O
Current setting resistor for ramp generator. Nominally equal to 1/8*Vcc
O
Class-D 1/2-H-bridge negative output for right channel
O
Class-D 1/2-H-bridge positive output for right channel
Shutdown signal for IC (low=shutdown, high=operational). TTL logic levels with
I
compliance to Vcc.
-
Internally generated voltage supply for left channel bootstrap capacitors.
-
Internally generated voltage supply for right channel bootstrap capacitors.
I
DC voltage that sets the gain of the amplifier.
I
Analog reference for gain control section.
2.5-V Reference for analog cells, as well as reference for unused audio input when
O
using single-ended inputs.
DESCRIPTION
- 20 –
Confidential - Do Not Copy
SD or during power-up. A logic
VG720