ssm2275s Analog Devices, Inc., ssm2275s Datasheet - Page 11

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ssm2275s

Manufacturer Part Number
ssm2275s
Description
Rail-to-rail Output Audio Amplifiers
Manufacturer
Analog Devices, Inc.
Datasheet

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REV. A
Settling Time
The high slew rate and wide gain-bandwidth product of the
SSM2275 and SSM2475 amplifiers result in fast settling times
(t
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.
S
< 1 s) that are suitable for 16- and 20-bit applications. The
Figure 31. Spectral Graph of Amplifier Outputs
–100
–110
–120
–130
–140
–150
–160
–100
–110
–120
–130
–140
–150
–160
0
0
V
A
R
V
V
A
R
V
SY
IN
SY
IN
V
L
V
L
=
= 100k
= –1
= 100k
= 0dBV
= 0dBV
=
=
1
5V
5V
FREQUENCY – kHz
FREQUENCY – kHz
9V–15V
9V–15V
0.1 F
0.1 F
+
5V
10
10
+
DUT
V–
V+
1N4148
1k
Figure 32. Settling Time Test Fixture
R
L
D1
20
20
–15V
22
22
D2
15k
+15V
2N4416
2N2222A
–11–
222
1/2 OP260AJ
R
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 s for
the device to recover from output overload.
G
2k
R
F
Figure 34. Overload Recovery Time Test Circuit
–10
SCHOTTKY DIODES D1–D4 ARE
HEWLETT-PACKARD HP5082-2835
IC1 IS 1/2 OP260AJ
IC2 IS PMI OP41EJ
10
–2
–4
–6
–8
8
6
4
2
0
400
2V p-p
10kHz
750
1k
Figure 33. Settling Time vs. Step Size
10k
V
IN
10k
D3
0.1%
600
909
R
IC2
D4
1 F
S
1k
R1
SETTLING TIME – ns
OUTPUT
(TO SCOPE)
SSM2275/SSM2475
10k
+5V
–5V
800
R
F
0.01%
–0.01%
1000
R
10k
L
V
OUT
1200

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