Fangtek ft690, Инструкция

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690- 0502273076 www.fangtek.com 1
ft690
2W Mono BTL Audio Power Amplifier
General Description
The ft690 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other
portable communication device applications. It is capable
of delivering 1.25 watts of continuous average power to
an 8
Ω BTL load and 2 watts of continuous average
power (DFN only) to a 4 Ω BTL load with less than 1%
distortion (THD+N+N) from a 5VDC power supply.
The ft690 was designed specifically to provide high
quality output power with a minimal amount of external
components. The ft690 does not require output coupling
capacitors or bootstrap capacitors, and therefore is ideally
suited for mobile phone and other low voltage
applications where minimal power consumption is a
primary requirement.
The ft690 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by
either logic high or low depending on mode selection.
Driving the shutdown mode pin either high or low
enables the shutdown pin to be driven in a likewise
manner to enable shutdown.
The ft690 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during
turn-on and turn-off transitions.
The ft690 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
ƒ Improved PSRR at 217Hz & 1KHz 66dB
ƒ Power Output at 5.0V, 1% THD+N, 4 Ω (QFN only)
2W (typ)
ƒ Power Output at 5.0V, 1% THD+N, 8 Ω 1.25W (typ)
ƒ Power Output at 3.0V, 1% THD+N, 4 Ω 600mW (typ)
ƒ Power Output at 3.0V, 1% THD+N, 8 Ω 425mW (typ)
ƒ Shutdown Current 0.1 μ A (typ)
Features
ƒ Available in space-saving packages: DFN, MSOP,
WCSP
ƒ Ultra low current shutdown mode
ƒ Improved pop & click circuitry eliminates noise during
turn-on and turn-off transitions
ƒ 2.2 - 5.5V operation
ƒ No output coupling capacitors, snubber networks or
bootstrap capacitors required
ƒ Unity-gain stable
ƒ External gain configuration capability
ƒ User selectable shutdown High or Low logic Level
Applications
ƒ Mobile Phones
ƒ PDAs
ƒ Portable electronic device
Application Circuit
Figure 1.Typical Audio Amplifier Application Circuit (DFN)
Doc# ft690- 0502273076
December 15, 2006
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