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| 型號： | AD797AR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP 110MHZ ULDIST 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 放大器類型： | 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： | 25µV |
| 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： | 管件 |
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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| AD797AR-REEL | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| AD797AR-REEL7 | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| AD797ARZ | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:MicroAmplifier™ 放大器類型:通用 電路數(shù):4 輸出類型:- 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:296-29363-1 |
| AD797ARZ-REEL | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| AD797ARZ-REEL7 | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
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