SSM6322ACPZ-R2

Overview

The SSM6322ACPZ-R2 is a high-fidelity, low-power integrated stereo audio amplifier manufactured by Analog Devices Inc. It operates within a supply range of ±3.3 V to ±6 V and features flexible architecture compatible with digital-to-analog converters (DACs). The device accepts differential current or voltage inputs and provides single-ended voltage outputs. Key electrical specifications include a gain bandwidth of 25 MHz, a slew rate of 18 V/μs at ±5 V, and an A-weighted output noise of 1.8 μV rms. It delivers greater than 100 mA rms output current into heavy loads and achieves −121 dB THD + N at 1 kHz with a 32 Ω load.

Feature Summary

• Flexible architecture supporting direct interface with all digital-to-analog converters via differential current or voltage input.
• High output current drive capability designed to accurately reproduce large music transients into heavy loads.
• Excellent audio fidelity characterized by very low total harmonic distortion plus noise and low output integrated noise.
• Low power operation with specific enabled and disabled modes to maximize battery life in portable applications.

Applications

• High fidelity headphone drivers
• Mobile phones
• Bluetooth speakers and headphones
• Gaming notebooks and tablets
• A/V receivers

Procurement Notes

Verify the exact ordering suffix R2 against the manufacturer's official documentation to confirm packaging and reel specifications. Ensure compatibility with the required LFCSP-24 footprint and thermal management requirements on the printed circuit board. Confirm that the supply voltage range and shutdown logic levels align with the system design constraints before finalizing procurement.

Selection Notes

Select this component for designs requiring high dynamic range and precision audio amplification with minimal external components. The integrated common-mode control loop simplifies interfacing with current-output DACs. Consider the compact 4 mm × 4 mm LFCSP package for space-constrained portable devices. Evaluate the power dissipation limits relative to the ambient temperature and PCB layout to ensure reliable operation within the specified industrial temperature range.

Part Context

The SSM6322 is part of Analog Devices' portfolio of high-performance audio integrated circuits. It utilizes a proprietary extra fast complementary bipolar (XFCB) process to achieve exceptionally low 1/f noise and high load drive capability. The device combines a difference amplifier configuration with a common-mode loop to maintain optimal operating conditions for connected DACs, reducing overall system complexity and board area compared to discrete solutions.

Replacement Considerations

Consult the manufacturer's datasheet for officially listed alternative part numbers or updated revisions. Verify pinout compatibility and electrical parameter equivalence if substituting with other audio amplifier models from different manufacturers.

FAQ

How does the SSM6322 handle common-mode signals from the DAC?

The device implements a common-mode loop that maintains a fixed common-mode input level regardless of the differential or common-mode currents, ensuring the DAC operates in optimal conditions for best distortion performance.

What is the function of the SD and SD2 pins?

The SD and SD2 pins are shutdown controls. Setting both to Logic 1 enables the entire device. Setting SD to Logic 0 and SD2 to Logic 1 enables the input stage while disabling the output buffer. Setting SD2 to Logic 0 disables the entire device with a quiescent current of 15 μA.

Can the SSM6322 drive capacitive loads directly?

Yes, the device can drive capacitive loads. With a 2.2 nF capacitive load, the frequency response remains flat without peaking when configured with a gain of 1.