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參數(shù)資料
| 型號： | AD797AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Ultralow Distortion, Ultralow Noise Op Amp |
| 中文描述： | OP-AMP, 180 uV OFFSET-MAX, 110 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 406K |
| 代理商： | AD797AR-REEL |
AD797
REV. C
–14–
100M
1k
100
100
0
60
20
40
80
10M
1M
100k
10k
FREQUENCY – Hz
V
μ
V
V
O
μ
A
–80
–30
–50
–70
–60
–40
NOISE
V
OUT
Figure 49. Total Integrated Voltage Noise & V
OUT
of
Amorphous Detector Preamp
Professional Audio Signal Processing—DAC Buffers
T he low noise and low distortion of the AD797 make it an ideal
choice for professional audio signal processing. An ideal I-to-V
converter for a current output DAC would simply be a resistor
to ground, were it not for the fact that most DACs do not oper-
ate linearly with voltage on their output. Standard practice is to
operate an op amp as an I-to-V converter creating a virtual
ground at its inverting input. Normally, clock energy and cur-
rent steps must be absorbed by the op amp’s output stage.
However, in the configuration of Figure 50, Capacitor C
F
shunts high frequency energy to ground, while correctly repro-
ducing the desired output with extremely low T HD and IMD.
C1
2000pF
C
F
82pF
3k
AD797
**
2
7
3
4
6
**
–V
S
+V
S
** USE POWER SUPPLY BYPASSING SHOWN IN FIGURE 32.
100
AD1862
DAC
Figure 50. A Professional Audio DAC Buffer
Figure 51. Offset Null Configuration
Ultrasound/Sonar Imaging Preamp
T he AD600 variable gain amplifier provides the time controlled
gain (T CG) function necessary for very wide dynamic range so-
nar and low frequency ultrasound applications. Under some cir-
cumstances, it is necessary to buffer the input of the AD600 to
preserve its low noise performance. T o optimize dynamic range
this buffer should have at most 6 dB of gain. T he combination
of low noise and low gain is difficult to achieve. T he input
buffer circuit shown in Figure 47 provides 1 nV/
√
Hz
noise per-
formance at a gain of two (dc to 1 MHz) by using 26.1
resistors
in its feedback path. Distortion is only –50 dBc @ 1 MHz at a
2 volt p-p output level and drops rapidly to better than
–70 dBc at an output level of 200 mV p-p.
26.1‰
INPUT
7
4
3
2
AD797
**
**
AD600
**
**
6
26.1‰
VOUT
V
S
= ±6Vdc
+V
S
–V
S
* USE POWER SUPPLY
** BYPASSING SHOWN IN FIGURE 32.
Figure 47. An Ultrasound Preamplifier Circuit
Amorphous (Photodiode) Detector
Large area photodiodes C
S
≥
500 pF and certain image detec-
tors (amorphous Si), have optimum performance when used in
conjunction with amplifiers with very low voltage rather than
very low current noise. Figure 48 shows the AD797 used with
an amorphous Si (C
S
= 1000 pF) detector. T he response is ad-
justed for flatness using capacitor C
L
, while the noise is domi-
nated by voltage noise amplified by the ac noise gain. T he 797’s
excellent input noise performance gives 27
μ
V rms total noise in
a 1 MHz bandwidth, as shown by Figure 49.
50pF
C
S
1000pF
I
S
10k
AD797
**
2
7
3
4
6
**
–V
S
+V
S
** USE POWER SUPPLY BYPASSING SHOWN IN FIGURE 32.
C
L
100
Figure 48. Amorphous Detector Preamp
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| 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 |
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| AD797BN | 制造商:Analog Devices 功能描述: |
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