ssm2275s

Manufacturer Part Numberssm2275s
DescriptionRail-to-rail Output Audio Amplifiers
ManufacturerAnalog Devices, Inc.
ssm2275s datasheet
 


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FEATURES
Single or Dual-Supply Operation
Excellent Sonic Characteristics
Low Noise: 7 nV/ Hz
Low THD: 0.0006%
Rail-to-Rail Output
High Output Current:
50 mA
Low Supply Current: 1.7 mA/Amplifier
Wide Bandwidth: 8 MHz
High Slew Rate: 12 V/ s
No Phase Reversal
Unity Gain Stable
Stable Parameters Over Temperature
APPLICATIONS
Multimedia Audio
Professional Audio Systems
High Performance Consumer Audio
Microphone Preamplifier
MIDI Instruments
GENERAL DESCRIPTION
The SSM2275 and SSM2475 use the Butler Amplifier front
end, which combines both bipolar and FET transistors to offer
the accuracy and low noise performance of bipolar transistors
and the slew rates and sound quality of FETs. This product
family includes dual and quad rail-to-rail output audio amplifi-
ers that achieve lower production costs than the industry stan-
dard OP275 (the first Butler Amplifier offered by Analog
Devices). This lower cost amplifier also offers operation from a
single 5 V supply, in addition to conventional 15 V supplies.
The ac performance meets the needs of the most demanding au-
dio applications, with 8 MHz bandwidth, 12 V/ s slew rate and
extremely low distortion.
The SSM2275 and SSM2475 are ideal for application in high
performance audio amplifiers, recording equipment, synthesiz-
ers, MIDI instruments and computer sound cards. Where cas-
caded stages demand low noise and predictable performance,
SSM2275 and SSM2475 are a cost effective solution. Both are
stable even when driving capacitive loads.
The ability to swing rail-to-rail at the outputs (see Applications sec-
tion) and operate from low supply voltages enables designers to at-
tain high quality audio performance, even in single supply systems.
The SSM2275 and SSM2475 are specified over the extended
industrial (–40 C to +85 C) temperature range. The SSM2275 is
available in 8-lead plastic DIPs, SOICs, and microSOIC surface-
mount packages. The SSM2475 is available in narrow body
SOICs and thin shrink small outline (TSSOP) surface-mount
packages.
*Protected by U.S. Patent No. 5,101,126.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
Rail-to-Rail Output
Audio Amplifiers
SSM2275/SSM2475*
PIN CONFIGURATIONS
8-Lead Narrow Body SOIC
14-Lead Narrow Body SOIC
(SO-8)
1
8
OUT A
V+
OUT A
–IN A
2
7
OUT B
SSM2275
(Not to Scale)
3
6
–IN B
+IN A
4
5
+IN B
V–
OUT B
8-Lead microSOIC
(RM-8)
OUT A
OUT A
1
8
V+
–IN A
–IN A
OUT B
SSM2275
+IN A
+IN A
–IN B
V–
4
+IN B
5
+IN B
–IN B
OUT B
8-Lead Plastic DIP
(N-8)
OUT A
1
(Not to
Scale)
–IN A
2
+IN A
3
V–
4
SSM2275
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
(R-14)
1
14
OUT D
2
13
–IN A
–IN D
12
3
+IN D
+IN A
SSM2475
11
V–
V+
4
(Not to Scale)
10
+IN C
+IN B
5
9
6
–IN C
–IN B
8
7
OUT C
14-Lead TSSOP
(RU-14)
OUT D
1
14
–IN D
+IN D
SSM2475
V+
V–
+IN C
–IN C
7
8
OUT C
8
V+
7
OUT B
6
–IN B
5
+IN B
© Analog Devices, Inc., 1999

ssm2275s Summary of contents

  • Page 1

    ... D +IN A SSM2475 11 V– (Not to Scale) 10 + –IN C – OUT C 14-Lead TSSOP (RU-14) OUT –IN D +IN D SSM2475 V+ V– +IN C – OUT OUT B 6 – +IN B © Analog Devices, Inc., 1999 ...

  • Page 2

    SSM2275/SSM2475–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio A VO OUTPUT CHARACTERISTICS Output Voltage, High Output Voltage, Low Output Short Circuit Current Limit POWER SUPPLY Power Supply Rejection ...

  • Page 3

    ELECTRICAL CHARACTERISTICS Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio A VO OUTPUT CHARACTERISTICS Output Voltage, High Output Voltage, Low Output Short Circuit Current Limit POWER SUPPLY Supply Current/Amplifier DYNAMIC PERFORMANCE ...

  • Page 4

    ... For supplies less than 15 V, the input voltage and differential input voltage must be less than 15 V. Temperature Model Range SSM2275P – +85 C SSM2275S – +85 C SSM2275RM – +85 C SSM2475S – +85 C SSM2475RU – +85 C CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

  • Page 5

    FREQUENCY – Hz Figure 3. Phase/Gain vs. Frequency 100 –20 –40 10 100 1k 10k 100k FREQUENCY – Hz Figure 4. Phase/Gain ...

  • Page 6

    SSM2275/SSM2475 SSM2275/SSM2475–Typical Characteristics –100 –110 –120 –130 –140 –150 –160 FREQUENCY – kHz Figure 9. THD vs. Frequency (FFT) 0 20mV Figure 10. Small Signal Response 2 ...

  • Page 7

    Figure 15. Small Signal Response 2 + 100 mV p 20mV Figure 16. Small Signal Response 2 + ...

  • Page 8

    SSM2275/SSM2475–Typical Characteristics 0 20mV Figure 21. Small Signal Response + 100 mV p 20mV Figure 22. Small Signal Response +1, ...

  • Page 9

    THEORY OF OPERATION The SSM2275 and SSM2475 are low noise and low distortion rail-to-rail output amplifiers that are excellent for audio applica- tions. Based on the OP275 audiophile amplifier, the SSM2275/ SSM2475 offers many similar performance characteristics with the advantage ...

  • Page 10

    SSM2275/SSM2475 This phase reversal can be prevented by limiting the input cur- rent to +1 mA. This can be done by placing a resistor in series with the input terminal that is expected to be overdriven. The series resistance should ...

  • Page 11

    –110 100k –120 0dBV IN –130 –140 –150 –160 0 10 FREQUENCY – kHz –100 –110 A = – ...

  • Page 12

    SSM2275/SSM2475 Capacitive Loading The output of the SSM2275/SSM2475 can tolerate a degree of capacitive loading. However, under certain conditions, a heavy capacitive load could create excess phase shift at the output and put the device into oscillation. The degree of ...

  • Page 13

    Multimedia Soundcard Microphone Preamplifier The low distortion and low noise figures of the SSM2275 make it an excellent device for amplifying low level audio signals. Fig- ure 38 shows how the SSM2275 can be configured as a stereo microphone preamplifier ...

  • Page 14

    SSM2275/SSM2475 SPICE Macro-model The SPICE macro-model for the SSM2275 is shown in Listing 1 on the following page. This model is based on typical values for the device and can be downloaded from Analog Devices’ Internet site at www.analog.com. The ...

  • Page 15

    Listing 1: SSM2275 SPICE Macro-Model * SSM2275 SPICE Macro-Model Typical Values * 8/97, Ver TAM / ADSC * * Node assignments * non-inverting input * | inverting input * | | positive supply * | | | * ...

  • Page 16

    SSM2275/SSM2475 8-Lead SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80 0.1574 (4.00) 0.2440 (6.20 0.1497 (3.80) 0.2284 (5.80) PIN 1 0.0688 (1.75) 0.0098 (0.25) 0.0532 (1.35) 0.0040 (0.10) 0.0500 0.0192 (0.49) SEATING 0.0098 (0.25) (1.27) 0.0138 (0.35) PLANE ...