ST公司的TS4999是帶3D環(huán)繞聲的D類全差分音頻功率放大器,輸出功率達2.8W.器件具有四種不同的增益(3.5, 6, 9.5 和12 dB)設(shè)定.工作電壓2.4V-5.5V,217Hz時的PSRR為63dB,5V時輸出2.8W時的THD+N為10%,3.6V輸出0.7W時的THD+N為1%.TS4999可用在手機,PDA和筆記本電腦.本文介紹了TS4999的主要特性, 典型應(yīng)用電路, 測試框圖和PSRR測試框圖以及單端輸入應(yīng)用電路圖.
TS4999: Filter-free stereo 2.8 W class D audio power amplifier with selectable 3D sound effects
The TS4999 is a stereo fully-differential class D power amplifier. It can drive up to 1.35 W into a 8 ohm load at 5 V per channel. The device has four different gain settings utilizing two discrete pins, G0 and G1.
Pop and click reduction circuitry provides low on/off switch noise while allowing the device to start within 8 ms. 3D enhancement effects are selected through one digital input pin that allows more amazing stereo audio sound.
Two standby pins (active low) allow each channel to be switched off separately.
The TS4999 is available in a flip chip, 18-bump, lead-free package.
TS4999主要特性:
Operates from VCC = 2.4 to 5.5 V
Dedicated standby mode active low/channel
Output power per channel: 2.8 W at 5 V into 4 ohm with 10% THD+N or 0.7 W at 3.6 V into 8 ohm with 1% THD+N max.
Selectable 3D sound effect
Four gain setting steps: 3.5, 6, 9.5 and 12 dB
Low current consumption
PSSR: 63 dB typical at 217 Hz.
Fast start up phase: 7.8 ms
Short-circuit and thermal shutdown protection
Flip chip 18-bump lead-free package
TS4999應(yīng)用:
Cellular phones
PDAs
Notebook PCs
圖1.TS4999典型應(yīng)用電路
圖2.TS4999測試框圖
圖3.TS4999 PSRR測試框圖
圖4.TS4999單端輸入應(yīng)用電路圖
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