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PDF SSM2475 Data sheet ( Hoja de datos )
| Número de pieza | SSM2475 | |
| Descripción | (SSM2475 / SSM2275) Rail-to-Rail Output Audio Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Rail-to-Rail Output
Audio Amplifiers
SSM2275/SSM2475*
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/µs 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.
PIN CONFIGURATIONS
8-Lead Narrow Body SOIC 14-Lead Narrow Body SOIC
(SO-8)
(R-14)
OUT A 1
8 V+
–IN A 2 SSM2275 7 OUT B
(Not to Scale)
+IN A 3
6 –IN B
V– 4
5 +IN B
8-Lead microSOIC
(RM-8)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3
12 +IN D
V+ 4 SSM2475 11 V–
(Not to Scale)
+IN B 5
10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
14-Lead TSSOP
(RU-14)
OUT A
–IN A
+IN A
V–
18
SSM2275
45
V+
OUT B
–IN B
+IN B
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1 14
SSM2475
78
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
8-Lead Plastic DIP
(N-8)
OUT A 1
–IN A 2
(Not to
Scale)
8 V+
7 OUT B
+IN A 3
6 –IN B
V– 4
SSM2275
5 +IN B
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
© Analog Devices, Inc., 1999
1 page  
Typical Characteristics–SSM2275/SSM2475
100 225
VS = ؎15V
80
RL = 2k⍀
CL = 10pF
180
60 135
40 90
20 45
00
–20 –45
–40
10
–90
100 1k 10k 100k 1M 10M 40M
FREQUENCY – Hz
Figure 3. Phase/Gain vs. Frequency
60
VS = ؎15V
TA = ؉25؇C
50
40
30
20
10
0
10 100 1k 10k 100k
FREQUENCY – Hz
Figure 6. SSM2275 Voltage Noise Density (Typical)
100 225
VS = ؎15V
80
RL = 600⍀
CL = 10pF
180
60 135
40 90
20 45
00
–20 –45
–40
10
–90
100 1k 10k 100k 1M 10M 40M
FREQUENCY – Hz
Figure 4. Phase/Gain vs. Frequency
140
VS = ؎15V
TA = ؉25؇C
120
100
80
60
40
20
0
100 1k 10k 1M 10M 30M
FREQUENCY – Hz
Figure 7. Common-Mode Rejection vs. Frequency
2.0
VS = ؎15V
1.8 TA = ؉25؇C
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
10
100 1k
FREQUENCY – Hz
10k
Figure 5. SSM2275 Current Noise Density vs. Frequency
140
VS = ؎15V
TA = ؉25؇C
120
100
80
60
40
20
0
100 1k 10k 1M 10M
FREQUENCY – Hz
Figure 8. Power Supply Rejection vs. Frequency
REV. A
–5–
5 Page 
SSM2275/SSM2475
–100
–110
–120
–130
VSY = ؎5V
AV = ؉1
RL = 100k⍀
VIN = 0dBV
–140
–150
–160
0
–100
–110
–120
–130
10
FREQUENCY – kHz
VSY = ؉5V
AV = –1
RL = 100k⍀
VIN = 0dBV
20 22
–140
–150
–160
0
10
FREQUENCY – kHz
20 22
Figure 31. Spectral Graph of Amplifier Outputs
Settling Time
The high slew rate and wide gain-bandwidth product of the
SSM2275 and SSM2475 amplifiers result in fast settling times
(tS < 1 µs) that are suitable for 16- and 20-bit applications. The
test circuit used to measure the settling time of the SSM2275/
SSM2475 is shown in Figure 32. This test method has advan-
tages over false-sum node techniques of measuring settling times
in that the actual output of the amplifier is measured, instead of
an error voltage at the sum node. Common-mode settling ef-
fects are also taken into account in this circuit in addition to
slew rate and bandwidth factors.
The output waveform of the device under test is clamped by
Schottky diodes and buffered by the JFET source follower. The
signal is amplified by a factor of ten by the OP260 current feed-
back amplifier and then Schottky-clamped at the output to the
oscilloscope. The 2N2222 transistor sets up the bias current for
the JFET and the OP41 is configured as a fast integrator, pro-
viding overall dc offset nulling at the output.
10
8
؉0.1%
6
؉0.01%
4
2
0
–2
–4
–6
–0.01%
–8
–10
400 600 800 1000
SETTLING TIME – ns
Figure 33. Settling Time vs. Step Size
1200
Overdrive Recovery
The overdrive, or overload, recovery time of an amplifier is the time
required for the output voltage to return to a rated output voltage
from a saturated condition. This recovery time can be important in
applications where the amplifier must recover quickly after a large
transient event, or overload. The circuit in Figure 34 was used to
evaluate the recovery time for the SSM2275/SSM2475. Also shown
are the input and output voltages. It takes approximately 0.5 µs for
the device to recover from output overload.
VIN
2V p-p
10kHz
RS
909⍀
+5V
R1
1k⍀
–5V
RL
10k⍀
VOUT
RF
10k⍀
Figure 34. Overload Recovery Time Test Circuit
9V–15V
–+
0.1F
V+
DUT
V–
0.1F
+–
9V–15V
؎5V
RL
1k⍀
D1
+15V
1k⍀
2N4416 1/2 OP260AJ
D3
D2
RF
2k⍀
10k⍀
OUTPUT
(TO SCOPE)
D4
1F
10k⍀
IC2
RG
222⍀
2N2222A
750⍀
1N4148
15k⍀
–15V
SCHOTTKY DIODES D1–D4 ARE
HEWLETT-PACKARD HP5082-2835
IC1 IS 1/2 OP260AJ
IC2 IS PMI OP41EJ
Figure 32. Settling Time Test Fixture
REV. A
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SSM2475.PDF ] | |
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