High Fidelity, Low Power,

Integrated Stereo Audio Amplifier

Data Sheet

SSM6322

Rev. 0

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FEATURES

Flexible architecture to interface with all digital-to-analog

converters (DACs)

Accepts differential current or voltage input (provides

single-ended voltage output)

High output current drive capability

Greater than 100 mA rms output current

Accurately reproduces large music transients into heavy

loads (16 Ω to 32 Ω)

Excellent audio fidelity

−121 dB total harmonic distortion plus noise (THD + N) at

1 kHz, 2 V rms output with ±5 V supply and 32 Ω load

Low output integrated noise (10 Hz to 22 kHz) of

1.8 μV rms with A-weighted filter

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

Low power operation

Disabled/voice select: <30 μA

Low power disable mode with high output impedance

High-Z in power-down mode eliminating voice mode

switch from the high fidelity path

Greater than 87 dB power supply rejection ratio (PSRR) at

20 kHz

Adjustable input common-mode voltage with resistor

programmable reference voltage

1.45 V (typical) with no external components

Capable of two single-pole, low-pass filters in series

2.2 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

APPLICATIONS

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

FUNCTIONAL BLOCK DIAGRAM

SSM6322

GAIN1

VNFB1

REF1

GND1

VEE2

2

VP1

VN1

INPUT

VOUT1

OUTPUT

GAIN2

FILT1

FILT2

VP2

VN2

5

6

INPUT

VOUT2

VNFB2

OUTPUT

1

22

24

23

18

17

9

REF2

7

8

13

14

16

SD

SD2

3

4

10

21

GND2

GND3

GND4

11

12

VCC2

VEE1 VCC1

20

19

15

Figure 1.

GENERAL DESCRIPTION

The SSM6322 is an integrated, dual-channel audio amplifier

solution that interfaces directly with audio DAC/CODEC,

maximizing the fidelity of high fidelity audio signal chains. The

highly efficient design of the SSM6322 delivers outstanding

audio performance while minimizing power dissipation for

maximum battery life in portable applications.

The SSM6322 features −121 dB THD + N at 1 kHz, along

with very low output noise from 20 Hz to 20 kHz. The low power

operation, high peak output current, and high PSRR make the

SSM6322 an ideal candidate for applications that require high

fidelity audio, high dynamic range, precision, and low power. This

highly integrated drive solution also reduces development time

while reducing board space and minimizing external components.

The SSM6322 is available in a 24-lead LFCSP package. The

SSM6322 operates over the industrial temperature of −40°C to

+85°C.