SSM2211_04 데이터 시트보기 (PDF) - Analog Devices

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SSM2211_04

Low Distortion 1.5 Watt Audio Power Amplifier

Analog Devices 

PRODUCT OVERVIEW

The SSM2211 is a low distortion speaker amplifier that can run

from a 1.7 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.

20kΩ

VDD

6

20kΩ

VIN

4

3

A1

SSM2211

5

VO1

50kΩ

50kΩ

50kΩ

2

A2

8

VO2

0.1µF

50kΩ

BIAS

CONTROL

7

1

SHUTDOWN

Figure 41. Simplified Schematic

SSM2211

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 op amp, A2, is config-

ured with a fixed gain of AV = −1 and produces an inverted

replica of Pin 5 at Pin 8. The SSM2211 outputs at Pins 5 and 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 Pins 5 and 8

are exactly equal, resulting in zero dc differential 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 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.

Rev. C | Page 13 of 20

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