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參數(shù)資料
| 型號(hào)： | AD797 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultralow Distortion, Ultralow Noise Op Amp |
| 中文描述： | 超低失真，超低噪聲運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 406K |
| 代理商： | AD797 |
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AD797
REV. C
–12–
0.47μF
250‰
0.47μF
4.26k
1k‰
100‰
1k‰
2x
HP2835
(VIA LESS THAN 1FT
50 COAXIAL CABLE)
V
ERROR
X 5
1k‰
20pF
51pF
NOTE:
USE CIRCUIT
BOARD
WITH GROUND
PLANE
1k‰
TEKTRONIX
CALIBRATION
FIXTURE
VIN
20pF
1M
TO TEKTRONIX
7A26
OSCILLOSCOPE
PREAMP INPUT
SECTION
A1
AD797
7
4
6
–VS
+VS
1μF
0.1μF
1μF
0.1μF
3
2
A2
AD829
7
4
6
–VS
+VS
3
2
2x
HP2835
226
Figure 40. Settling Time Test Circuit
DIST ORT ION RE DUCT ION
T he AD797 has distortion performance (T HD < –120 dB, @
20 kHz, 3 V rms, R
L
= 600
) unequaled by most voltage
feedback amplifiers.
At higher gains and higher frequencies T HD will increase due
to reduction in loop gain. However in contrast to most conven-
tional voltage feedback amplifiers the AD797 provides two effec-
tive means of reducing distortion, as gain and frequency are
increased; cancellation of the output stage’s distortion and gain
bandwidth enhancement by decompensation. By applying these
techniques gain bandwidth can be increased to 450 MHz at
G = 1000 and distortion can be held to –100 dB at 20 kHz for
G = 100.
T he unique design of the AD797 provides for cancellation of the
output stage’s distortion (patent pending). T o achieve this a ca-
pacitance equal to the effective compensation capacitance, usu-
ally 50 pF, is connected between Pin 8 and the output (C2 in
Figure 41). Use of this feature will improve distortion perfor-
mance when the closed loop gain is more than 10 or when fre-
quencies of interest are greater than 30 kHz.
Bandwidth enhancement via decompensation is achieved by
connecting a capacitor from Pin 8 to ground (C1 in Figure 41)
effectively subtracting from the value of the internal compensa-
tion capacitance (50 pF), yielding a smaller effective compensa-
tion capacitance and, therefore, a larger bandwidth. T he
benefits of this begin at closed loop gains of 100 and up. A
maximum value of
≈
33 pF at gains of 1000 and up is recom-
mended. At a gain of 1000 the bandwidth is 450 kHz.
T able IV and Figure 42 summarize the performance of the
AD797 with distortion cancellation and decompensation.
R1
V
IN
R2
50pF
AD797
2
8
3
6
a.
C1, SEE TABLE
C2 = 50pF – C1
R1
V
IN
R2
AD797
2
8
3
6
C1
C2
b.
Figure 41. Recommended Connections for Distortion
Cancellation and Bandwidth Enhancement
T able IV. Recommended E xternal Compensation
A/B
R1
A B
C1
C2
3 dB
(pF)
BW
R2
C1
C2 3 dB
(pF)
BW
G = 10
G = 100
G = 1000 10 k 10
909
1 k
100
10
0
0
0
50
50
50
6 MHz
1 MHz
110 kHz
0
15
33
50 6 MHz
33 1.5 MHz
15 450 kHz
–80
300k
–120
300
100
–110
–100
–90
100k
30k
10k
3k
1k
FREQUENCY – Hz
T
0.01
0.003
0.001
0.0003
0.0001
T
NOISE LIMIT, G=1000
NOISE LIMIT, G=100
G=1000
R
L
=10k
G=1000
R
L
=600
G=10
R
L
=600
G=100
R
L
=600
Figure 42. Total Harmonic Distortion (THD) vs. Frequency
@ 3 V rms for Figure 41b
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD797AN | Ultralow Distortion, Ultralow Noise Op Amp |
| AD797AR | Ultralow Distortion, Ultralow Noise Op Amp |
| AD797BN | Ultralow Distortion, Ultralow Noise Op Amp |
| AD797BR | Ultralow Distortion, Ultralow Noise Op Amp |
| AD797AR-REEL | Ultralow Distortion, Ultralow Noise Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD797_08 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Ultralow Distortion, Ultralow Noise Op Amp |
| AD797AN | 制造商:Analog Devices 功能描述:OP Amp Single GP 制造商:Rochester Electronics LLC 功能描述:ULTRA LOW NOISE OP AMP IC - Bulk 制造商:Analog Devices 功能描述:10V to 36V 1 8MHz IyAv 8PDIP Tube 制造商:Analog Devices 功能描述:IC OP AMP U-LOW NOISE DIP8 797 |
| AD797AN | 制造商:Analog Devices 功能描述:SEMICONDUCTORS LINEAR |
| AD797ANZ | 功能描述:IC OPAMP GP 110MHZ ULDIST 8DIP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:MicroAmplifier™ 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:5pA 電壓 - 輸入偏移:1500µV 電流 - 電源:220µA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 36 V，±2.25 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:剪切帶 (CT) 其它名稱(chēng):296-29363-1 |
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