SSM2211CP-R2 datasheet(14/24 Pages) AD

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SSM2211

Rev. D | Page 14 of 24

PRODUCT OVERVIEW

The SSM2211 is a low distortion speaker amplifier that can run

from a 2.7 V to 5.5 V supply. It consists of a rail-to-rail input

and a differential output that can be driven within 400 mV of

either supply rail while supplying a sustained output current of

350 mA. The SSM2211 is unity-gain stable, requiring no

external compensation capacitors, and can be configured for

gains of up to 40 dB. Figure 41 shows the simplified schematic.

SHUTDOWN

VO1

VDD

VIN

20k

50k

0.1

μF

SSM2211

50k

VO2

BIAS

CONTROL

Figure 41. Simplified Schematic

Pin 4 and Pin 3 are the inverting and noninverting terminals

to A1. An offset voltage is provided at Pin 2, which should be

connected to Pin 3 for use in single-supply applications. The

output of A1 appears at Pin 5. A second operational amplifier,

A2, is configured with a fixed gain of AV = −1 and produces an

inverted replica of Pin 5 at Pin 8. The SSM2211 outputs at Pin 5

and Pin 8 produce a bridged configuration output to which a

speaker can be connected. This bridge configuration offers the

advantage of a more efficient power transfer from the input to

the speaker. Because both outputs are symmetric, the dc bias at

Pin 5 and Pin 8 are exactly equal, resulting in zero dc differ-

ential voltage across the outputs. This eliminates the need for a

coupling capacitor at the output.

THERMAL PERFORMANCE—LFCSP

The addition of the LFCSP to the Analog Devices, Inc., package

portfolio offers the SSM2211 user even greater choice when

considering thermal performance criteria. For the 8-lead,

3 mm × 3 mm LFCSP, the θJA is 50°C/W. This is a significant

performance improvement over most other packaging options.

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