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)
AV
DD
29
O
5-V Regulated output
AV
DD
REF 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
Содержание VA503b-1
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