参数资料
| 型号： | OP297EZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 500KHZ DUAL 8CDIP |
| 标准包装： | 48 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 转换速率： | 0.15 V/µs |
| 增益带宽积： | 500kHz |
| 电流 - 输入偏压： | 20pA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 525µA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 40 V，±2 V ~ 20 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 |
| 产品目录页面： | 774 (CN2011-ZH PDF) |
OP297
Rev. G | Page 12 of 16
NONLINEAR CIRCUITS
Due to its low input bias currents, the OP297 is an ideal log
amplifier in nonlinear circuits such as the square and square
squaring circuit of Figure 35 as an example, the analysis begins
by writing a voltage loop equation across Transistor Q1,
Transistor Q2, Transistor Q3, and Transistor Q4.
+
=
+
S4
REF
T4
S3
OUT
T3
S
IN
T2
S1
IN
T1
I
V
I
V
I
V
I
V
ln
2
All the transistors of the MAT04 are precisely matched and at
the same temperature, so the IS and VT terms cancel, where
2lnIIN = lnIOUT + lnIREF = ln(IOUT × IREF)
Exponentiating both sides of the equation leads to
()
REF
IN
OUT
I
2
=
Op Amp A2 forms a current-to-voltage converter, which gives
VOUT = R2 × IOUT. Substituting (VIN/R1) for IIN and the previous
equation for IOUT yields
2
=
R1
V
I
R2
V
IN
REF
OUT
A similar analysis made for the square root circuit of Figure 36
leads to its transfer function
()(
)
R1
I
V
R2
V
REF
IN
OUT =
7
6
5
–15V
1
2
3
V+
V–
Q3
Q1
Q2
Q4
13
14
12
8
9
10
4
8
6
5
7
2
3
1
MAT04E
–
+
1/2
OP297
–
+
1/2
OP297
VIN
R1
33k
C1
100pF
R3
50k
R4
50k
IREF
C2
100pF
R2
33k
VOUT
IOUT
003
00-
035
Figure 35. Squaring Amplifier
7
6
5
IOUT
–15V
1
2
3
V+
V–
Q1
7
9
10
4
8
3
1
MAT04E
8
Q3
5
6
Q4
13
12
14
Q2
R2
33k
C2
100pF
C1
100pF
R1
33k
R3
50k
R4
50k
VOUT
IREF
–
+
1/2
OP297
–
+
1/2
OP297
VIN
00300-
036
Figure 36. Square Root Amplifier
In these circuits, IREF is a function of the negative power supply.
To maintain accuracy, the negative supply should be well regu-
lated. For applications where very high accuracy is required, a
voltage reference can be used to set IREF.
An important consideration for the squaring circuit is that a
sufficiently large input voltage can force the output beyond the
operating range of the output op amp. Resistor R4 can be
changed to scale IREF or R1; R2 can be varied to keep the output
voltage within the usable range.
Unadjusted accuracy of the square root circuit is better than
0.1% over an input voltage range of 100 mV to 10 V. For a
similar input voltage range, the accuracy of the squaring circuit
is better than 0.5%.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OP-297EZ | 制造商:AD 制造商全称:Analog Devices 功能描述:DUAL LOW BIAS CURRENT PRECISION OPERATIONAL AMPLIFIER |
| OP297FAB | 制造商:TT Electronics / OPTEK Technology 功能描述:LED IR PLASTIC HP T-1 制造商:TT ELECTRONICS 功能描述:Bulk / LED Plastic T 1- 3/4 with High power LED Chip 制造商:TT Electronics / OPTEK Technology 功能描述:LED PLASTIC T 1- 3/4 WITH HIGH POWER LED CHIP |
| OP297FP | 制造商:Analog Devices 功能描述:OP Amp Dual GP 制造商:Rochester Electronics LLC 功能描述:DUAL PRECISION LOW IB OP - Bulk 制造商:Analog Devices 功能描述:OP AMP DUAL LOW BIAS DIP8 297 |
| OP-297FP | 制造商:AD 制造商全称:Analog Devices 功能描述:DUAL LOW BIAS CURRENT PRECISION OPERATIONAL AMPLIFIER |
| OP297FPZ | 功能描述:IC OPAMP GP 500KHZ DUAL 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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