2024年5月27日发(作者：洪蓉蓉)
ZI4890
1 Watt Audio Power Amplifier
DESCRIPTION
The ZI4890 is an audio power amplifier designed for
portable communication device applications such as
mobile phone applications. The ZI4890 is capable of
delivering 1.0W of continuous average power to an 8Ω
BTL and with less than 1% distortion (THD+N) from a
5.0V power supply, and 350mW to a 8Ω BTL load from a
3V power supply.
The ZI4890 provides high quality audio while requiring
few external components and minimal power consumption.
It features a low-power shutdown mode, which is achieved
by driving the pin with logic low.
SHUTDOWN
The ZI4890 contains circuitry to prevent from ”pop and
click” noise that would otherwise occur during turn-on and
turn-off transitions.
For maximum flexibility, the ZI4890 provides an externally
controlled gain (with resistors), as well as an externally
controlled turn-on and turn-off times (with the bypass
capacitor).
The ZI4890 is available in a MSOP-8 and a 3mm×3mm
QFN package.
FEATURES
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2.5-5.5V operation
65dB PSRR at 217Hz, V
DD
=5V
0.1µA ultra low current shutdown mode
Improved pop & click circuitry
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capability
BTL output can drive capacitive loads
RoHS compliant and 100% lead(Pb)-free
APPLICATIONS
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Mobile Phones
PDAs
Portable electronic devices
Block Diagram
Figure1.
1
ZI4890
Typical Application Circuit
Figure2. Audio Amplifier with Single –Ended Input
Figure3. Audio Amplifier with Differential Input
2
2024年5月27日发(作者：洪蓉蓉)
ZI4890
1 Watt Audio Power Amplifier
DESCRIPTION
The ZI4890 is an audio power amplifier designed for
portable communication device applications such as
mobile phone applications. The ZI4890 is capable of
delivering 1.0W of continuous average power to an 8Ω
BTL and with less than 1% distortion (THD+N) from a
5.0V power supply, and 350mW to a 8Ω BTL load from a
3V power supply.
The ZI4890 provides high quality audio while requiring
few external components and minimal power consumption.
It features a low-power shutdown mode, which is achieved
by driving the pin with logic low.
SHUTDOWN
The ZI4890 contains circuitry to prevent from ”pop and
click” noise that would otherwise occur during turn-on and
turn-off transitions.
For maximum flexibility, the ZI4890 provides an externally
controlled gain (with resistors), as well as an externally
controlled turn-on and turn-off times (with the bypass
capacitor).
The ZI4890 is available in a MSOP-8 and a 3mm×3mm
QFN package.
FEATURES
z
z
z
z
z
z
z
z
z
z
2.5-5.5V operation
65dB PSRR at 217Hz, V
DD
=5V
0.1µA ultra low current shutdown mode
Improved pop & click circuitry
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capability
BTL output can drive capacitive loads
RoHS compliant and 100% lead(Pb)-free
APPLICATIONS
z
z
z
Mobile Phones
PDAs
Portable electronic devices
Block Diagram
Figure1.
1
ZI4890
Typical Application Circuit
Figure2. Audio Amplifier with Single –Ended Input
Figure3. Audio Amplifier with Differential Input
2