参数资料
| 型号： | AD744AQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP BIFET 13MHZ PREC 8CDIP |
| 标准包装： | 48 |
| 放大器类型： | J-FET |
| 电路数： | 1 |
| 转换速率： | 75 V/µs |
| -3db带宽： | 13MHz |
| 电流 - 输入偏压： | 30pA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 3.5mA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-CERDIP |
| 包装： | 管件 |
REV. C
AD744
–8–
EXTERNAL FREQUENCY COMPENSATION
Even though the AD744 is useable without compensation in
most applications, it may be externally compensated for even
more flexibility. This is accomplished by connecting a capacitor
between Pins 5 and 8. Figure 28, a simplified schematic of the
AD744, shows where this capacitor is connected. This feature is
useful because it allows the AD744 to be used as a unity gain
voltage follower. It also enables the amplifier to drive capacitive
loads up to 2000 pF and greater.
5pF
+IN
300
–IN
NULL /
COMPENSATION
NULL /
DECOMPENSATION
300
COMPENSATION
2mA
400 A
+VS
OUTPUT
–VS
1k
8k
Figure 28. AD744 Simplified Schematic
The slew rate and gain bandwidth product of the AD744 are in-
versely proportional to the value of the compensation capacitor,
CCOMP. Therefore, when trying to maximize the speed of the
amplifier, the value of CCOMP should be minimized. CCOMP can
also be used to slow the amplifier to a point where the slew rate
is perfectly symmetrical and well controlled. Figure 29 sum-
marizes the effect of external compensation on slew rate and
bandwidth.
CCOMP – pF
2
0
GAIN
BANDWIDTH
–
MHz
20
0.02
0.2
10
100
1000
10
SLEW
RATE
–
V/
s
100
0.1
1.0
Figure 29. Gain Bandwidth and Slew Rate vs. CCOMP
The following section provides tables to show what CCOMP values
will provide the necessary compensation for given circuit configurations
and capacitive loads. In each case, the recommended CCOMP is a
minimum value. A larger CCOMP can always be used, but slew rate
and bandwidth performance will be degraded.
Figure 30 shows the AD744 configured as a unity gain voltage
follower. In this case, a minimum compensation capacitor of
5 pF is necessary for stable operation. Larger compensation ca-
pacitors can be used for driving larger capacitive loads. Table I
outlines recommended minimum values for CCOMP based on
the desired capacitive load. It also gives the slew rate and band-
width that will be achieved for each case.
AD744
1 F
0.1 F
–VS
CCOMP 5pF
1 F
0.1 F
+VS
VOUT
VIN
Figure 30. AD744 Connected as a Unity Gain
Voltage Follower
Table I. Recommended Values of CCOMP vs.
Various Capacitive Loads
Max
–3 dB
CLOAD
CCOMP
Slew Rate
Bandwidth
Gain
(pF)
(V/ s)
(MHz)
1
50
5
37
6.5
1
150
10
25
4.3
1
2000
25
12.5
2.0
Figures 31 and 32 show the AD744 as a voltage follower
with gain and as an inverting amplifier. In these cases, external
compensation is not necessary for stable operation. How-
ever, compensation may be applied to drive capacitive loads
above 50 pF. Table II gives recommended CCOMP values, along
with expected slew rates and bandwidths for a variety of load
conditions and gains for the circuits in Figures 31 and 32.
AD744
1 F
0.1 F
–VS
CCOMP
1 F
0.1 F
+VS
VOUT
VIN
OPTIONAL
R2*
CLEAD*
R1*
*SEE TABLE II
Figure 31. AD744 Connected as a Voltage Follower
Operating at Gains of 2 or Greater
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD744AQ/+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
| AD744AR | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision, 500 ns Settling BiFET Op Amp |
| AD744BQ | 功能描述:IC OPAMP BIFET 13MHZ PREC 8CDIP 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) |
| AD744BQ/+ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD744CH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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