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OP271 Datenblatt(PDF) 9 Page - Analog Devices

Teilenummer OP271
Bauteilbeschribung  High-Speed, Dual Operational Amplifier
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OP271 Datenblatt(HTML) 9 Page - Analog Devices

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REV. A
OP271
–9–
FREQUENCY RATIO – 1/
/
–7
0.001
0
0.01
0.005
0.005
0.1
1.0
0.5
–6
–5
–4
–3
–2
–1
SINGLE OP AMP,
CONVENTIONAL
DESIGN
CASCADED
(TWO STAGES)
LOW PHASE ERROR
AMPLIFIER
1/2
OP271FZ
1/2
OP271FZ
VIN
IOUT
11mA
R3
10k
R1
10k
IOUT =
VIN
RS
VIN
100
=
=10mA/V
R5
100
R2
10k
+15V
–15V
R4
10k
1
2
3
4
5
6
7
8
VOUTA
RFBB
VDD
–15V
0.1 F
AGND
10pF
10 F
VOUTB
+15V
10 F
0.1 F
10pF
IOUTA
IOUTB
RFBA
DGND
5V
10V
VREFA
VREFB
DAC A/DAC B
LDAC
WR
DAC
CONTROL
REFERENCE
VOLTAGE
DAC-8222EW
DAC A
DAC B
1/2
OP271EZ
1/2
OP271EZ
1
2
3
4
5
6
7
8
18
19
20
21
22
23
24
4
2
3
+
+
12-BIT DATABUS PINS 6–17
Figure 5. Phase Error Comparison
Figure 5 compares the phase error performance of the low
phase error amplifier with a conventional single op amp
amplifier and a cascaded two-stage amplifier. The low phase
error amplifier shows a much lower phase error, particularly for
frequencies where
T<0.1. For example, phase error of
-0.1 occurs at 0.002
T for the single op amplifier, but
at 0.11
T for the low phase error amplifier.
For more detailed information on the low phase error amplifier,
see Application Note AN-107.
Figure 6. Dual 12-Bit Voltage Output DAC
Dual 12-Bit Voltage Output DAC
The dual voltage output DAC shown in Figure 6 will settle to
12-bit accuracy from zero to full scale in 2
s typically. The
CMOS DAC-8222 utilizes a 12-bit, double-buffered input
structure allowing faster digital throughput and minimizing
digital feedback.
Fast Current Pump
Maximum output current of the fast current pump shown in
Figure 7 is
11 mA. Voltage compliance exceeds
10 V with
15 V supplies. The current pump has an output resistance
of over 3 M
and maintains 12-bit linearity over its entire
output range.
Figure 7. Fast Current Pump


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