SSM2211_15 Datasheet, PDF (1/24 Pages) Analog Devices – Low Distortion, 1.5 W Audio Power Amplifier

Data Sheet
FEATURES
1.5 W output with THD + N < 1%
Differential bridge-tied load output
Single-supply operation: 2.7 V to 5.5 V
Functions down to 1.75 V
Wide bandwidth: 4 MHz
Highly stable phase margin: >80°
Low distortion: 0.2% THD + N at 1 W output
Excellent power supply rejection
APPLICATIONS
Portable computers
Personal wireless communicators
Hands-free telephones
Speaker phones
Intercoms
Musical toys and talking games
GENERAL DESCRIPTION
The SSM2211¹ is a high performance audio amplifier that
delivers 1 W rms of low distortion audio power into a bridge-
connected 8 Ω speaker load (or 1.5 W rms into a 4 Ω load).
The SSM2211 operates over a wide temperature range and is
specified for single-supply voltages between 2.7 V and 5.5 V.
When operating from batteries, it continues to operate down to
1.75 V. This makes the SSM2211 the best choice for unregulated
applications, such as toys and games.
Featuring a 4 MHz bandwidth and distortion below 0.2% THD
+ N at 1 W, superior performance is delivered at higher power
or lower speaker load impedance than competitive units.
Furthermore, when the ambient temperature is at 25°C, THD +
N < 1%, and VS = 5 V on a four-layer PCB, the SSM2211
delivers a 1.5 W output.
Low Distortion, 1.5 W Audio
Power Amplifier
SSM2211
FUNCTIONAL BLOCK DIAGRAM
IN–
V_OUTA
IN+
BYPASS
SHUTDOWN
V_OUTB
BIAS
V– (GND)
Figure 1.
SSM2211
The low differential dc output voltage results in negligible
losses in the speaker winding and makes high value dc blocking
capacitors unnecessary. The battery life is extended by using
shutdown mode, which typically reduces quiescent current
drain to 100 nA.
The SSM2211 is designed to operate over the −40°C to +85°C
temperature range. The SSM2211 is available in 8-lead SOIC
(narrow body) and LFCSP (lead frame chip scale) surface-
mount packages. The advanced mechanical packaging of the
LFCSP models ensures lower chip temperature and enhanced
performance relative to standard packaging options.
Applications include personal portable computers, hands-free
telephones and transceivers, talking toys, intercom systems, and
other low voltage audio systems requiring 1 W output power.
1 _{Protected by U.S. Patent No. 5,519,576.}
Rev. F
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