参数资料
| 型号： | AD797ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20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) |
AD797
Data Sheet
Rev. J | Page 14 of 20
The I-to-V converter is a special case of the follower configu-
ration. When the AD797 is used in an I-to-V converter, for
example as a DAC buffer, the circuit shown in Figure 40 should
be used. The value of CL depends on the DAC, and if CL is greater
than 33 pF, a 100 Ω series resistor is required. A bypassed balancing
resistor (RS and CS) can be included to minimize dc errors.
7
*
VOUT
+VS
–VS
AD797
00846-
039
R1
RS
IIN
CS
6
3
4
100
600
20pF TO 120pF
2
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 40. I-to-V Converter Connection
THE INVERTING CONFIGURATION
The inverting configuration (see Figure 41) presents a low input
impedance, R1, to the source. For this reason, the goals of both
low noise and input buffering are at odds with one another.
Nonetheless, the excellent dynamics of the AD797 makes
it the preferred choice in many inverting applications, and
with careful selection of feedback resistors, the noise penalties
are minimal. Some examples are presented in Table 7 and
7
*
VOUT
VIN
+VS
–VS
AD797
00846-
040
R2
RL
RS
R1
CL
6
3
4
2
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 41. Inverting Amplifier Connection
Table 7. Values for Inverting Circuit
Gain
R1
R2
CL
Noise
(Excluding RS)
1
1 kΩ
≈ 20 pF
3.0 nV/√Hz
1
300 Ω
≈ 10 pF
1.8 nV/√Hz
10
150 Ω
1500 Ω
≈ 5 pF
1.8 nV/√Hz
DRIVING CAPACITIVE LOADS
The capacitive load driving capabilities of the AD797 are
displayed in Figure 42. At gains greater than 10, usually no
special precautions are necessary. If more drive is desirable,
however, the circuit shown in Figure 43 should be used. For
example, this circuit allows a 5000 pF load to be driven cleanly
at a noise gain ≥2.
00846-
041
100nF
10nF
1pF
100
10
1
1k
1nF
100pF
10pF
CLOSED-LOOP GAIN
CA
P
ACI
T
IV
E
L
O
AD
DRI
V
E
CA
P
A
B
ILIT
Y
Figure 42. Capacitive Load Drive Capability vs. Closed-Loop Gain
7
*
VOUT
VIN
+VS
–VS
AD797
00846-
042
C1
20pF
200pF
6
3
4
2
33
100
1k
*USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35.
Figure 43. Recommended Circuit for Driving a High Capacitance Load
SETTLING TIME
The AD797 is unique among ultralow noise amplifiers in that it
settles to 16 bits (<150 μV) in less than 800 ns. Measuring this
performance presents a challenge. A special test circuit (see
Figure 44) was developed for this purpose. The input signal was
obtained from a resonant reed switch pulse generator, available
from Tektronix as calibration Fixture No. 067-0608-00. When
open, the switch is simply 50 Ω to ground and settling is purely
a passive pulse decay and inherently flat. The low repetition rate
signal was captured on a digital oscilloscope after being amplified
and clamped twice. The selection of plug-in for the oscilloscope
was made for minimum overload recovery.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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