SSM2211-EVAL

Manufacturer Part NumberSSM2211-EVAL
DescriptionBOARD EVALUATION FOR SSM2211
ManufacturerAnalog Devices Inc
SSM2211-EVAL datasheet
 


Specifications of SSM2211-EVAL

Module/board TypeEvaluation BoardFor Use With/related ProductsSSM2211
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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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 @ 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
1
The SSM2211
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 @ 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 V
= 5 V on a four-layer PCB, the SSM2211
S
delivers a 1.5 W output.
1
Protected by U.S. Patent No. 5,519,576.
Rev. E
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.
Low Distortion, 1.5 W Audio
Power Amplifier
FUNCTIONAL BLOCK DIAGRAM
IN–
IN+
BYPASS
SHUTDOWN
BIAS
V– (GND)
Figure 1.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
SSM2211
V
A
OUT
V
B
OUT
SSM2211
www.analog.com

SSM2211-EVAL Summary of contents

  • Page 1

    ... 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 ...

  • Page 2

    ... Changes to Absolute Maximum Ratings ....................................... 5 Changes to Figure 41 ...................................................................... 14 Changes to Equation 7, Equation 8, and Equation 10 ............... 16 Changes to Figure 47 ...................................................................... 17 Changes to Automatic Shutdown-Sensing Circuit Section ...... 18 Changes to SSM2211Amplifier Design Example Section ......... 19 Changes to Driving Two Speakers Single Endedly Section ...... 20 Changes to Figure 50 ...................................................................... 20 Changes to Evaluation Board Section .......................................... 20 Changes to Figure 51 ...................................................................... 20 Changes to Ordering Guide .......................................................... 22 11/06— ...

  • Page 3

    ... THD + 0.35 W into 8 Ω kHz Rev Page Min Typ Max 4 50 0.1 3.0 1.3 66 ≤ +85°C 9 ≤ +85°C 0 0.15 0.2 85 Min Typ Max 5 50 0.1 1.7 1 ≤ +85°C 5 ≤ +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 LFCSP_VD, θ −65°C to +150°C 2 For the SOIC_N, θ −40°C to +85°C −65°C to +165°C 300°C ESD CAUTION Rev Page SSM2211 θ 121 is measured with exposed lead frame soldered to the PCB measured with the device soldered to a four-layer PCB. ...

  • Page 6

    ... B 8 OUT V– OUT Description Shutdown Enable. Bypass Capacitor. Noninverting Input. Inverting Input. Output A. Positive Supply. Negative Supply. Output B. 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 ...

  • 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 ...

  • 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. The diode, 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

    ... Using a 2.2 μ practical choice for C C The gain bandwidth product for each internal amplifier in the SSM2211 is 4 MHz. Because 4 MHz is much greater than 4.14 × 20 kHz, the design meets the upper frequency bandwidth criteria. The SSM2211 can also be configured for higher differential gains without running into bandwidth limitations ...

  • Page 20

    ... 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 can be attenuated by turning the 10 kΩ potentiometer in the CW (clockwise) direction. C isolates the input common-mode voltage (V Pin 2 and Pin 3 ...

  • Page 21

    ... Figure 53. 8-Lead Lead Frame Chip Scale Package [LFCSP_VD × Body, Very Thin, Dual Lead (CP-8-2) Dimensions shown in millimeters Rev Page 0.50 (0.0196) 45° 0.25 (0.0099) 1.27 (0.0500) 0.40 (0.0157) 0.50 0.40 0.30 PIN 1 INDICATOR 1 8 1.89 1.50 1.74 REF 1. 1.60 1.45 1.30 SSM2211 ...

  • Page 22

    ... SSM2211SZ 1 –40°C to +85°C 1 SSM2211SZ-REEL –40°C to +85°C 1 SSM2211SZ-REEL7 –40°C to +85°C SSM2211-EVAL 1 SSM2211-EVALZ RoHS Compliant Part; # denotes RoHS compliant product may be top or bottom marked. Package Description Package Option 8-Lead LFCSP_VD CP-8-2 8-Lead LFCSP_VD CP-8-2 8-Lead LFCSP_VD CP-8-2 ...

  • Page 23

    ... NOTES Rev Page SSM2211 ...

  • Page 24

    ... SSM2211 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00358-0-4/08(E) Rev Page ...