The ft690 is a mono Class-AB audio power amplifier
designed for demanding applications in mobile
phones and other portable media devices. It is
capable of delivering 1.25W of continuous output
power to an 8Ω BTL load with less than 1% distortion
(THD+N) from a 5VDC power supply.
The ft690 is specifically designed to provide high
quality output power with a minimal number of
external components. The ft690 does not require
output coupling capacitors or bootstrap capacitors,
and is therefore ideal for use in mobile phones and
other low voltage applications where minimal power
consumption is a primary requirement.
The ft690 features a low-power shutdown mode. In
the shutdown mode where a logic low is applied onto
the SD pin, the amplifier is completely turned off and
no supply current will flow through the device.
The ft690 also features advanced pop & click
circuitry which eliminates noise which would
otherwise ur during turn-on and turn-off
transitions.
The ft690 is unity-gain stable and can be configured
by external gain-setting resistors.
FEATURES
? Ultra low current in shutdown mode
? Low quiescent current
? Improved pop & click circuitry eliminates noise
during turn-on and turn-off transitions
? Supports both single-end and differential inputs
? Wide operating voltage range: 2.5 ~ 5.5V
? No output coupling capacitors, snubber networks
or bootstrap capacitors required
? Available in space-saving package
COL1.5X1.5-9L
MSOP-8L
KEY SPECIFICATIONS
? Improved PSRR at 217Hz : 66dB
? Power Output at 5V, 1% THD+N, 8Ω: 1.25W
? Power Output at 3V, 1% THD+N, 8Ω: 425mW
? Quiescent Current 1.6mA (VDD=3V)
APPLICATIONS
? Mobile phone
? PDA
? Portable electronic devices

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