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[原创] ADI SSM6322高保真低功耗立体声音频放大器解决方案

关键词:消费类电子 立体声音频放大器 蓝牙 手机 SSM6322

时间:2017-04-11 10:46:17       作者:ADI       来源:中电网

ADI公司的SSM6322是高保真低功耗立体声音频放大器,可直接和音频DAC/CODEC接口,具有杰出的音频性能和最小化功耗,从而延长手持设备电池寿命.1kHz时的THD+N为-121dB,输出电流100 mA rms,电源电压±3.3 V到±6 V,4 mm × 4 mm LFCSP封装,主要用在高保真耳机驱动器,手机,蓝牙扬声器和耳机,笔记本电脑和平板电脑A/V接收器,汽车娱乐系统.本文介绍了SSM6322主要特性,功能框图,以及评估板SSM6322CP-EBZ主要特性,电路图,材料清单和PCB设计图.

The SSM6322 is an integrated, dual-channel audio amplifiersolution that interfaces directly with audio DAC/CODEC,maximizing the fidelity of high fidelity audio signal chains. Thehighly efficient design of the SSM6322 delivers outstandingaudio performance while minimizing power dissipation formaximum battery life in portable applications.

The SSM6322 features −121 dB THD + N at 1 kHz, alongwith very low output noise from 20 Hz to 20 kHz. The low poweroperation, high peak output current, and high PSRR make theSSM6322 an ideal candidate for applications that require highfidelity audio, high dynamic range, precision, and low power. Thishighly integrated drive solution also reduces development timewhile reducing board space and minimizing external components.

The SSM6322 is available in a 24-lead LFCSP package. TheSSM6322 operates over the industrial temperature of −40°C to+85°C.

SSM6322主要特性:

Flexible architecture to interface with all digital-to-analogconverters (DACs)

Accepts differential current or voltage input (providessingle-ended voltage output)

High output current drive capability

Greater than 100 mA rms output current

Accurately reproduces large music transients into heavyloads (16 Ω to 32 Ω)

Excellent audio fidelity

−121 dB total harmonic distortion plus noise (THD + N) at1 kHz, 2 V rms output with ±5 V supply and 32 Ω load

Low output integrated noise (10 Hz to 22 kHz) of1.8 μVrms with A-weighted filter

Supply range: ±3.3 V to ±6 V (typical)

Low power operation

Enabled: 60 mW, VCC = +5 V, VEE = −5 V

Disabled/voice select: <30 μA

Low power disable mode with high output impedance

High-Z in power-down mode eliminating voice modeswitch from the high fidelity path

Greater than 87 dB power supply rejection ratio (PSRR) at20 kHz

Adjustable input common-mode voltage with resistorprogrammable reference voltage

1.45 V (typical) with no external components

Capable of two single-pole, low-pass filters in series2.2 nF maximum input capacitor

Second filter between the GAINx and FILTx pins

Pop and click noise suppression

Signal chain integration supports small printed circuit board(PCB) area

Compact 4 mm × 4 mm LFCSP package

SSM6322应用:

High fidelity headphone drivers

Mobile phones

Bluetooth speakers and headphones

Gaming notebooks and tablets

A/V receivers

Professional audio equipment

Audio test equipment

Automobile infotainment systems

图1.功能框图

评估板SSM6322CP-EBZ

 The SSM6322 evaluation board, the SSM6322CP-EBZ, evaluates the SSM6322, which is offered in a 24-lead LFCSP package. The SSM6322CP-EBZ evaluation board is a 4-layer printed circuit board (PCB) designed to quickly evaluate the performance of the device and reduce design time. The SSM6322CP-EBZ accepts SMA edge mounted connectors to test equipment or other circuitry.

Figure 1 shows the component side of the evaluation board, and Figure 2 shows the circuit side of the SSM6322CP-EBZ.

Complete specifications for the SSM6322 device are provided in the SSM6322 data sheet and should be consulted in conjunction with this user guide when using the evaluation board.

评估板SSM6322CP-EBZ主要特性:

Enables quick prototyping

Edge mounted SMA connector provisions

Easy connection to test equipment and other circuits

±5 V and +3.3 V to supply the external circuit

图2.评估板SSM6322CP-EBZ外形图(正面)

图3.评估板SSM6322CP-EBZ外形图(背面)

图4.评估板SSM6322CP-EBZ电路图(1)

图5.评估板SSM6322CP-EBZ电路图(2)

评估板SSM6322CP-EBZ材料清单:

图6.评估板SSM6322CP-EBZ PCB设计图(1)

图7.评估板SSM6322CP-EBZ PCB设计图(2)

图8.评估板SSM6322CP-EBZ PCB设计图(3)

图9.评估板SSM6322CP-EBZ PCB设计图(4)

图10.评估板SSM6322CP-EBZ PCB设计图(5)

详情请见:

http://www.analog.com/media/en/technical-documentation/data-sheets/SSM6322.pdf

http://www.analog.com/media/en/technical-documentation/user-guides/SSM6322CP-EBZ-UG-1097.pdf

SSM6322.pdf

SSM6322CP-EBZ-UG-1097.pdf

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