SSM2211S Analog Devices Inc, SSM2211S Datasheet - Page 14

• Manufacturer Part Number: SSM2211S
• Description: IC AMP AUDIO PWR 1W MONO 8SOIC
• Manufacturer: Analog Devices Inc
• Type: Class ABr

Specifications of SSM2211S

• Rohs Status: RoHS non-compliant
• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1.5W x 1 @ 4 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Differential Inputs, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)

SSM2211
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.
IN–
0.1µF
20kΩ
4
3
2
20kΩ
Figure 41. Simplified Schematic
A1
50kΩ
50kΩ
V+
6
7
50kΩ
SSM2211
SHUTDOWN
CONTROL
A2
BIAS
50kΩ
1
5
8
V
V
OUT
OUT
A
B
Rev. E | Page 14 of 24
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 A
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 differential
voltage across the outputs. This eliminates the need for a coupling
capacitor at the output.
THERMAL PERFORMANCE—LFCSP
The LFCSP offers the SSM2211 user even greater choices when
considering thermal performance criteria. For the 8-lead,
3 mm × 3 mm LFCSP, the θ
performance improvement over most other packaging options.
JA
is 50°C/W. This is a significant
V
= −1 and produces an