VERROR × 5 –V
參數(shù)資料
型號(hào)： AD797BR-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/20頁(yè)
文件大小： 0K
描述： IC OPAMP GP 110MHZ ULDIST 8SOIC
標(biāo)準(zhǔn)包裝： 750
放大器類(lèi)型： 通用
電路數(shù)： 1
轉(zhuǎn)換速率： 20 V/µs
增益帶寬積： 110MHz
-3db帶寬： 8MHz
電流 - 輸入偏壓： 250nA
電壓 - 輸入偏移： 10µV
電流 - 電源： 8.2mA
電流 - 輸出 / 通道： 50mA
電壓 - 電源，單路/雙路(±)： ±5 V ~ 15 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
Data Sheet
AD797
Rev. J | Page 15 of 20
VERROR × 5
–VS
+VS
VIN
00
84
6-
0
43
TO TEKTRONIX
7A26
OSCILLOSCOPE
PREAMP INPUT
SECTION
(VIA LESS THAN 1FT
50 COAXIAL CABLE)
TEKTRONIX
CALIBRATION
FIXTURE
NOTES
USE CIRCUIT BOARD WITH GROUND PLANE.
2×
HP2835
2×
HP2835
1M
226
51pF
1k
100
250
0.47F
1F
0.1F
1F
0.1F
0.47F
4.26k
20pF
7
3
6
2
A2
AD829
A1
AD797
4
7
3
6
2
4
+
–
+
–
Figure 44. Settling Time Test Circuit
DISTORTION REDUCTION
The AD797 has distortion performance (THD < 120 dB,
at 20 kHz, 3 V rms, RL = 600 Ω) unequaled by most voltage
feedback amplifiers.
At higher gains and higher frequencies, THD increases due to a
reduction in loop gain. However, in contrast to most conven-
tional voltage feedback amplifiers, the AD797 provides two
effective means of reducing distortion as gain and frequency
are increased: cancellation of the distortion of the output stage
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.
The unique design of the AD797 provides cancellation of the
output stage’s distortion. To achieve this, a capacitance equal to
the effective compensation capacitance, usually 50 pF, is
connected between Pin 8 and the output (see C2 in Figure 45).
Use of this feature improves distortion performance when the
closed-loop gain is more than 10 or when frequencies of interest
are greater than 30 kHz.
Bandwidth enhancement via decompensation is achieved by
connecting a capacitor from Pin 8 to ground (see C1 in Figure 45).
Adding C1 results in subtracting from the value of the internal
compensation capacitance (50 pF), yielding a smaller effective
compensation capacitance and therefore a larger bandwidth.
The benefits of adding C1 are evident for closed-loop gains
of ≥100. A maximum value of ≈33 pF at gains of ≥1000 is
recommended. At a gain of 1000, the bandwidth is 450 kHz.
Table 8 and Figure 46 summarize the performance of the
AD797 with distortion cancellation and decompensation.
VIN
a.
b.
AD797
00
84
6-
0
44
50pF
R1
R2
C1, SEE TABLE
C2 = 50pF – C1
6
2
3
VIN
AD797
C2
C1
R1
6
2
3
8
VOUT
Figure 45. Recommended Connections for Distortion Cancellation
and Bandwidth Enhancement
Table 8. Recommended External Compensation for
Distortion Cancellation and Bandwidth Enhancement
A/B
A
B
Gain
R1
(Ω)
R2
(Ω)
C1
(pF)
C2
(pF)
3 dB
BW
C1
(pF)
C2
(pF)
3 dB
BW
10
909
100
0
50
6 MHz
0
50
6 MHz
100
1 k
10
0
50
1 MHz
15
33
1.5 MHz
1000
10 k
10
0
50
110 kHz
33
15
450 kHz
00
84
6-
0
45
–80
300k
–120
300
100
–110
–100
–90
100k
30k
10k
3k
1k
FREQUENCY (Hz)
TH
D
(
d
B
)
0.01
0.003
0.001
0.0003
0.0001
TH
D
(
%
)
NOISE LIMIT, G = +1000
NOISE LIMIT, G = +100
G = +1000
RL = 600
G = +1000
RL = 10k
G = +10
RL = 600
G = +100
RL = 600
Figure 46. Total Harmonic Distortion (THD) vs. Frequency at 3 V rms
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