参数资料
| 型号： | AD797ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 110MHZ ULDIST 8SOIC |
| 标准包装： | 98 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 转换速率： | 20 V/µs |
| 增益带宽积： | 110MHz |
| -3db带宽： | 8MHz |
| 电流 - 输入偏压： | 250nA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 8.2mA |
| 电流 - 输出 / 通道： | 50mA |
| 电压 - 电源，单路/双路(±)： | ±5 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 772 (CN2011-ZH PDF) |
Data Sheet
AD797
Rev. J | Page 17 of 20
Ultrasound/Sonar Imaging Preamp
The AD600 variable gain amplifier provides the time-controlled
gain (TCG) function necessary for very wide dynamic range
sonar and low frequency ultrasound applications. Under some
circumstances, it is necessary to buffer the input of the AD600
to preserve its low noise performance. To optimize dynamic
range, this buffer should have a maximum of 6 dB of gain. The
combination of low noise and low gain is difficult to achieve.
The input buffer circuit shown in Figure 51 provides 1 nV/√Hz
noise performance at a gain of 2 (dc to 1 MHz) by using 26.1 Ω
resistors in its feedback path. Distortion is only 50 dBc at
1 MHz for a 2 V p-p output level and drops rapidly to better
than 70 dBc at an output level of 200 mV p-p.
*
7
*
+VS
VS = ±6Vdc
VOUT
AD797
00846-
050
26.1
6
3
4
2
–VS
AD600
VIN
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 51. An Ultrasound Preamplifier Circuit
Amorphous (Photodiode) Detector
Large area photodiodes (CS ≥ 500 pF) and certain image
detectors (amorphous Si) have optimum performance when used
in conjunction with amplifiers with very low voltage (rather than
very low current noise). Figure 52 shows the AD797 used with
an amorphous Si (CS = 1000 pF) detector. The response is adjusted
for flatness using capacitor CL, and the noise is dominated by
voltage noise amplified by the ac noise gain. The AD797’s excellent
input noise performance gives 27 μV rms total noise in a 1 MHz
bandwidth, as shown by Figure 53.
*
7
*
+VS
IS
AD797
00846-
051
10k
100
CL
50pF
CS
1000pF
6
3
4
2
–VS
VOUT
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 52. Amorphous Detector Preamp
00846-
052
100M
1k
100
0
60
20
40
80
10M
1M
100k
10k
FREQUENCY (Hz)
VO
LT
AG
E
N
OIS
E
(mV
rms
(0.
1Hz
F
RE
Q
UE
NCY
))
V
O
UT
(d
B
Re
1V
/
A)
–80
–30
–50
–70
–60
–40
NOISE
VOUT
Figure 53. Total Integrated Voltage Noise and VOUT
of Amorphous Detector Preamp
Professional Audio Signal Processing—DAC Buffers
The 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 operate
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 current
steps must be absorbed by the op amp output stage. However, in
frequency energy to ground while correctly reproducing the
desired output with extremely low THD and IMD.
7
*
+VS
–VS
AD797
00846-
053
CF
82pF
6
2
C1
2000pF
4
100
3k
AD1862
DAC
3
VOUT
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 54. A Professional Audio DAC Buffer
VOUT
7
+VS
–VS
AD797
6
2
4
3
1
5
VOS ADJUST
00846-
054
–IN
+IN
20k
Figure 55. Offset Null Configuration
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相关代理商/技术参数 |
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|---|---|
| AD797ARZ-REEL | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD797ARZ-REEL7 | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:150 系列:- 放大器类型:音频 电路数:2 输出类型:- 转换速率:5 V/µs 增益带宽积:12MHz -3db带宽:- 电流 - 输入偏压:100nA 电压 - 输入偏移:500µV 电流 - 电源:6mA 电流 - 输出 / 通道:50mA 电压 - 电源，单路/双路(±):4 V ~ 32 V，±2 V ~ 16 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| AD797BN | 制造商:Analog Devices 功能描述: |
| AD797BR | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| AD797BR-REEL | 功能描述:IC OPAMP GP 110MHZ ULDIST 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
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