SSM2211 Analog Devices, SSM2211 Datasheet

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SSM2211

Manufacturer Part Number
SSM2211
Description
Low Distortion, 1.5 Watt Audio Power Amplifier
Manufacturer
Analog Devices
Datasheet

Specifications of SSM2211

Case
SOP8
Dc
01+

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FEATURES
1.5 W output
Differential (BTL
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 degrees
Low distortion: 0.2% THD + N @ 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 SSM2211
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).
It operates over a wide temperature range and is specified for
single-supply voltages between 2.7 V and 5.5 V. When oper-
ating 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 @ 1 W,
superior performance is delivered at higher power or lower
speaker load impedance than competitive units.
The low differential dc output voltage results in negligible
losses in the speaker winding and makes high value dc blocking
capacitors unnecessary. Battery life is extended by using
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
1
3
is a high performance audio amplifier that
2
) output
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
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
2
3
At R
Bridge-tied load.
Protected by U.S. Patent No. 5,519,576.
SHUTDOWN
L
= 4 Ω, T
Low Distortion, 1.5 W Audio
BYPASS
IN–
IN+
A
FUNCTIONAL BLOCK DIAGRAM
= 25°C, THD + N < 1%, V
BIAS
©2006 Analog Devices, Inc. All rights reserved.
Figure 1.
V– (GND)
Power Amplifier
S
= 5 V, 4-layer PCB.
SSM2211
SSM2211
www.analog.com
V
V
OUT
OUT
A
B

Related parts for SSM2211

SSM2211 Summary of contents

Page 1

... Figure 1. 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 ...

Page 2

... Changes to Start-Up Popping Noise Section .............................. 17 Changes to Ordering Guide .......................................................... 20 Power Dissipation....................................................................... 16 Output Voltage Headroom........................................................ 17 Automatic Shutdown-Sensing Circuit..................................... 17 Shutdown-Circuit Design Example ......................................... 18 Start-Up Popping Noise............................................................. 18 SSM2211 Amplifier Design Example .................................. 18 Single-Ended Applications........................................................ 19 Driving Two Speakers Single Endedly..................................... 19 Evaluation Board ........................................................................ 20 LFCSP Printed Circuit Board Layout Considerations .......... 20 Outline Dimensions ....................................................................... 21 Ordering Guide .......................................................................... 21 10/02— ...

Page 3

... THD + 0.35 W into 8 Ω kHz Rev Page Min Typ Max 4 50 0.1 3.0 1.3 66 9.5 20 < +85°C 0 0.15 0.2 85 Min Typ Max 5 50 0.1 1.7 1 ≤ +85°C 5.2 20 ≤ +85°C 0 0.1 SSM2211 Unit mV Ω μA MHz Degrees % % nV√Hz Unit mV Ω μA % ...

Page 4

... SSM2211 25° Ω 0.1 μ Table 3. Parameter GENERAL CHARACTERISTICS Differential Output Offset Voltage Output Impedance SHUTDOWN CONTROL Input Voltage High Input Voltage Low POWER SUPPLY Supply Current Supply Current, Shutdown Mode AUDIO PERFORMANCE Total Harmonic Distortion = V /2, unless otherwise noted. ...

Page 5

... For the SOIC_N, θ 300°C circuit board. ESD CAUTION Rev Page SSM2211 θ 121 is measured with exposed lead frame soldered to the JA is measured with the device soldered to a 4-layer printed ...

Page 6

... Noninverting Input. 4 IN– Inverting Input Output A. OUT 6 V+ Positive Supply. 7 V– Negative Supply Output B. OUT OUT V– OUT Rev Page PIN 1 SHUTDOWN INDICATOR OUT BYPASS 2 7 V– SSM2211 IN TOP VIEW IN– (Not to Scale) OUT Figure 3. 8-Lead LFCSP_VD Pin Configuration (CP-8-2) ...

Page 7

... 0.01 20 10k 20k 0 25° (BTL 8Ω 0.01 20 10k 20k Rev Page SSM2211 0.1μF B 100 1k 10k 20k FREQUENCY (Hz) Figure 7. THD + N vs. Frequency 0.1μF B 100 1k 10k 20k FREQUENCY (Hz) Figure 8. THD + N vs. Frequency C = 0.1μ 1μF B 100 1k 10k 20k FREQUENCY (Hz) Figure 9 ...

Page 8

... SSM2211 25° (BTL 8Ω L FREQUENCY = 20Hz C = 0.1μ 0.1 0.01 20n 0.1 P (W) OUTPUT Figure 10. THD + N vs 25° (BTL 8Ω L FREQUENCY = 1kHz C = 0.1μ 0.1 0.01 20n 0.1 P (W) OUTPUT Figure 11. THD + N vs 25° (BTL 8Ω L FREQUENCY = 20kHz C = 0.1μ 0.1 ...

Page 9

... 250mW 0 25° 2. (BTL 8Ω 250mW L 0. Rev Page SSM2211 0.1μ 1μF 100 1k 10k FREQUENCY (Hz) Figure 19. THD + N vs. Frequency 0.1μ 1μ 25° 2. (BTL 8Ω 250mW L 100 1k 10k FREQUENCY (Hz) Figure 20. THD + N vs. Frequency C = 0.1μ 1μ ...

Page 10

... SSM2211 25° 2. (BTL 8Ω L FREQUENCY = 20Hz 1 0.1 0.01 20n 0.1 P (W) OUTPUT Figure 22. THD + N vs 25° 2. (BTL 8Ω L FREQUENCY = 1kHz 1 0.1 0.01 20n 0.1 P (W) OUTPUT Figure 23. THD + N vs 25° 2. (BTL 8Ω L FREQUENCY = 20kHz 1 0.1 0.01 20n 0.1 P (W) OUTPUT Figure 24. THD + N vs. P ...

Page 11

... Figure 31. Maximum Power Dissipation vs. Ambient Temperature 10k Figure 32. Supply Current vs. Shutdown Voltage at Pin Rev Page SSM2211 T = 150°C J,MAX FREE AIR, NO HEAT SINK SOIC θ = 121°C/W JA LFCSP θ = 50°C/W JA 8-LEAD LFCSP 8-LEAD SOIC 100 110 AMBIENT TEMPERATURE (° 25° ...

Page 12

... SSM2211 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 2. LOAD RESISTANCE (Ω) Figure 34. P vs. Load Resistance OUTPUT –20 –40 –60 –80 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 35. Gain and Phase Shift vs. Frequency (Single Amplifier 3. –20 180 20 135 –45 –90 4 –135 –180 0 10M 100M – ...

Page 13

... OUTPUT OFFSET VOLTAGE (mV) Figure 38. Output Offset Voltage Distribution 600 SAMPLE SIZE = 1,700 500 400 300 200 100 SUPPLY CURRENT (mA) Figure 39. Supply Current Distribution – ° –55 –60 –65 – Rev Page SSM2211 = 5V ± 100mV = 15 μ 100 1k 10k FREQUENCY (Hz) Figure 40. PSRR vs. Frequency 30k ...

Page 14

... 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 ...

Page 15

... Equation 3, as doubling the peak voltage results in four times the power delivered to the load typical application operating from supply, the maximum power that can be delivered by the SSM2211 Ω speaker in a single-ended configuration is 250 mW. By driving this speaker with a bridged output power can be delivered. This translates to a – ...

Page 16

... DISS Using Equation 9 and the power derating curve in Figure 31, the maximum ambient temperature can be found easily. This ensures that the SSM2211 does not exceed its maximum junction temperature of 150°C. The power dissipation for a (5) single-ended output application where the load is capacitively coupled is given by ∂ ...

Page 17

... Figure 47 shows a circuit that can be used to take the SSM2211 in and out of shutdown mode automatically. This circuit can be set to turn the SSM2211 on when an input signal of a certain amplitude is detected. The circuit also puts the device into low power shutdown mode if an input signal is not sensed within a certain amount of time ...

Page 18

... The input signal to the SSM2211 is also connected to the non- inverting terminal of A2. R1, R2, and R3 set the threshold voltage at which the SSM2211 taken out of shutdown mode. D1 half-wave rectifies the output of A2, discharging C1 to ground when an input signal greater than the set threshold voltage is detected ...

Page 19

... The extra supply voltage also allows the SSM2211 to reproduce peaks in excess without clipping the signal. With and Ω, Equation 9 shows that DD L the maximum power dissipation for the SSM2211 is 633 mW. From the power derating curve in Figure 31, the ambient temperature must be less than 73°C for the SOIC and 118°C for the LFCSP ...

Page 20

... I IN 20kΩ POT. 20kΩ 1µ 20kΩ C1 0.1µF Figure 50. Evaluation Board Schematic The voltage gain of the SSM2211 is given by Equation 20 × desired, the input signal may be attenuated by turning the 10 kΩ potentiometer in the CW (clockwise ) direction. C isolates the input common-mode voltage (V and Pin 3 ...

Page 21

... SSM2211CPZ-REEL7 –40°C to +85°C SSM2211S –40°C to +85°C SSM2211S-REEL –40°C to +85°C SSM2211S-REEL7 –40°C to +85°C 1 SSM2211SZ –40°C to +85°C 1 SSM2211SZ-REEL –40°C to +85°C 1 SSM2211SZ-REEL7 –40°C to +85°C SSM2211-EVAL Pb-free part; # denotes lead-free product may be top or bottom marked. ...

Page 22

... SSM2211 NOTES Rev Page ...

Page 23

... NOTES Rev Page SSM2211 ...

Page 24

... SSM2211 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00358-0-11/06(D) Rev Page ...

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