Datasheet

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SLOS389A – NOVEMBER 2001– REVISED MAY 2002
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4
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O DESCRIPTION
AGND 2 Analog ground
AREF 5 O Connect 1 µF capacitor to ground for AREF voltage filtering
AVDD 1 I Analog power supply
COSC 4 I Connect capacitor to ground to set oscillation frequency (220 pF for 500 kHz, 1 nF for 100 kHz) when the internal
oscillator is selected; connect clock signal when an external oscillator is used
FAULT0 10 O Fault flag 0, low when active open drain output (see application information)
FAULT1 9 O Fault flag 1, high when active open drain output (see application information)
FREQ 32 I
Selects 500 kHz switching frequency when a TTL logic low is applied to this terminal; selects 100 kHz switching
frequency when a TTL logic high is applied
IN– 7 I Negative differential input
IN+ 6 I Positive differential input
INT/EXT 31 I Selects the internal oscillator when a TTL logic high is applied to this terminal; selects the use of an external oscil-
lator when a TTL logic low is applied to this terminal
OUT– 14, 15,
16, 17
O Negative bridge-tied load (BTL) output (4 pins)
OUT+ 24, 25,
26, 27
O Positive bridge-tied load (BTL) output (4 pins)
PGND 18, 19,
20, 21,
22, 23
High-current ground (6 pins)
PVDD 11, 12,
13, 28,
29, 30
I High-current power supply (6 pins)
ROSC 3 I Connect 120-kΩ resistor to AGND to set oscillation frequency (either 500 kHz or 100 kHz). Not needed if an
external clock is used.
SHUTDOWN 8 I Places the amplifier in shutdown mode when a TTL logic low is applied to this terminal; places the amplifier
in normal operation when a TTL logic high is applied