PIN Function
TERMINAL
NO. NAME
I/O DESCRIPTION
AGND 9,10,26 -
Analog ground for digital/analog cells in core
AVcc 33 -
High-voltage analog power supply (8.5V to 14V)
AVDD 29 O
5-V Regulated output
AVDDREF 7 O
5-V Reference output-provided for connection to adjacent VREF terminal.
BSLN 13 I/O
Bootstrap I/O for left channel, negative high-side FET
BSLP 24 I/O
Bootstrap I/O for left channel, positive high-side FET
BSRN 48 I/O
Bootstrap I/O for right channel, negative high-side FET
BSRP 37 I/O
Bootstrap I/O for right channel, positive high-side FET
COSC 28 I/O
I/O for charge/discharging currents onto capacitor for ramp generator triangle wave
biased at V2P5
FADE 30 I
Input for controlling volume ramp rate when cycling SD or during power-up. A logic
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.
LINN 6 I
Negative differential audio input for left channel
LINP 5 I
Positive differential audio input for left channel
LOUTN 16,17 O
Class-D 1/2-H-bridge negative output for left channel
LOUTP 20,21 O
Class-D 1/2-H-bridge positive output for left channel
MUTE 34 I
A logic high on this pin disables the outputs. A low on this pin enables the outputs.
NC 31,32,35 -
Not internally connected
PGNDL 18,19 -
Power ground for left channel H-bridge
PGNDR 42,43 -
Power ground for right channel H-bridge
PVVCCL 14,15 -
Power supply for left channel H-bridge(tied to pins 22 and 23 internally), not
connected to PVCCR or AVcc
PVVCCL 22,23 -
Power supply for left channel H-bridge(tied to pins 14 and 15 internally), not
connected to PVCCR or AVcc
PVCCR 38,39 -
Power supply for right channel H-bridge(tied to pins 46 and 47 internally), not
connected to PVCCL or AVcc
PVCCR 46,47 -
Power supply for right channel H-bridge(tied to pins 38 and 39 internally), not
connected to PVCCL or AVcc
REFGND 12 -
Ground for gain control circuitry. Connect to AGND. If using a DAC to control the
volume, connect the DAC ground to this terminal.
RINP 3 I
Positive differential audio input for right channel
RINN 2 I
Negative differential audio input for right channel
ROSC 27 I/O
Current setting resistor for ramp generator. Nominally equal to 1/8*Vcc
ROUTN 44,45 O
Class-D 1/2-H-bridge negative output for right channel
ROUTP 40,41 O
Class-D 1/2-H-bridge positive output for right channel
SD 1 I
Shutdown signal for IC (low=shutdown, high=operational). TTL logic levels with
compliance to Vcc.
VCLAMPL 25 -
Internally generated voltage supply for left channel bootstrap capacitors.
VCLAMPR 36 -
Internally generated voltage supply for right channel bootstrap capacitors.
VOLUME 11 I
DC voltage that sets the gain of the amplifier.
VREF 8 I
Analog reference for gain control section.
V2P5 4 O
2.5-V Reference for analog cells, as well as reference for unused audio input when
using single-ended inputs.
ViewSonic Corporation VA503b-1_ VA503m-1
23
Confidential - Do Not Copy
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