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參數(shù)資料
| 型號(hào)： | AD8037 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps(低失真,寬帶電壓反饋鉗位放大器) |
| 中文描述： | 低失真，寬帶電壓反饋鉗放大器（低失真，寬帶電壓反饋鉗位放大器） |
| 文件頁(yè)數(shù)： | 17/24頁(yè) |
| 文件大小： | 585K |
| 代理商： | AD8037 |
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AD8036/AD8037
REV. 0
–17–
closed-loop gain at the output. For instance, to set an output
limit of
±
1 V for an AD8037 operating at a gain of 3.0, V
H
and
V
L
would need to be set to +0.333 V and –0.333 V, respectively.
The only restriction on using the AD8036’s and AD8037’s
+V
IN
, V
L
, V
H
pins as inputs is that the maximum voltage differ-
ence between +V
IN
and V
H
or V
L
should not exceed 6.3 V, and
all three voltages be within the supply voltage range. For ex-
ample, if V
L
is set at –3 V, then V
IN
should not exceed +3.3 V.
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
INPUT VOLTAGE – +V
IN
1.6
0.6
1.2
0.8
1.0
1.4
O
O
AD8036
OUTPUT CLAMP AMP
CLAMP ERROR – 25mV
AD8036
CLAMP ERROR – >200mV
OUTPUT CLAMP
Figure 73. Output Clamp Error vs. Input Clamp Error
AD8036/AD8037 APPLICATIONS
The AD8036 and AD8037 use a unique input clamping circuit
to perform the clamping function. As a result, they provide the
clamping function better than traditional output clamping de-
vices and provide additional flexibility to perform other unique
applications.
There are, however, some restrictions on circuit configurations;
and some calculations need to be performed in order to figure
the clamping level, as a result of clamping being performed at
the input stage.
The major restriction on the clamping feature of the AD8036/
AD8037 is that clamping occurs only when using the amplifiers
in the noninverting mode. To clamp in an inverting circuit, an
additional inverting gain stage is required. Another restriction is
that V
H
be greater than V
L
, and that each be within the output
voltage range of the amplifier (
±
3.9 V). V
H
can go below ground
and V
L
can go above ground as long as V
H
is kept higher than V
L
.
Unity Gain Clamping
The simplest circuit for calculating the clamp levels is a unity
gain follower as shown in Figure 74. In this case, the AD8036
should be used since it is compensated for noninverting unity
gain.
This circuit will clamp at an upper voltage set by V
H
(the voltage
applied to Pin 8) and a lower voltage set by V
L
(the voltage ap-
plied to Pin 5).
Clamping with Gain
Figure 75 shows an AD8037 configured for a noninverting gain
of two. The AD8037 is used in this circuit since it is compen-
sated for gains of two or greater and provides greater band-
width. In this case, the high clamping level at the output will
+5V
V
IN
R
F
130
V
OUT
10μF
AD8036
0.1μF
3
6
7
4
8
5
–5V
V
H
+
+
V
L
140
V
L
2
V
H
UNITY GAIN NONINVERTING CLAMP
0.1μF
0.1μF
0.1μF
10μF
Figure 74. Unity Gain Noninverting Clamp
occur at 2
×
V
H
and the low clamping level at the output will be
2
×
V
L
. The equations governing the output clamp levels in cir-
cuits configured for noninverting gain are:
V
CH
=
G
×
V
H
V
CL
=
G
×
V
L
where:
V
CH
is the high
output
clamping level
V
CL
is the low
output
clamping level
G is the gain of the amplifier configuration
V
H
is the high input clamping level (Pin 8)
V
L
is the low input clamping level (Pin 5)
*Amplifier offset is assumed to be zero.
+5V
V
IN
R
F
100
V
OUT
10μF
AD8037
0.1μF
3
6
7
4
8
5
–5V
V
H
+
+
V
L
274
V
L
2
V
H
0.1μF
274
R
G
49.9
GAIN OF TWO NONINVERTING CLAMP
0.1μF
10μF
0.1μF
Figure 75. Gain of Two Noninverting Clamp
Clamping with an Offset
Some op amp circuits are required to operate with an offset
voltage. These are generally configured in the inverting mode
where the offset voltage can be summed in as one of the inputs.
Since AD8036/AD8037 clamping does not function in the in-
verting mode, it is not possible to clamp with this configuration.
Figure 76 shows a noninverting configuration of an AD8037
that provides clamping and also has an offset. The circuit shows
the AD8037 as a driver for an AD9002, an 8-bit, 125 Msps
A/D converter and illustrates some of the considerations for us-
ing an AD8037 with offset and clamping.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8037AR-REEL7 | Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps |
| AD8036-EB | Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps |
| AD8037ACHIPS | Connector assemblies, Test RoHS Compliant: Yes |
| AD8037AN | Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps |
| AD8037AR | Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8037ACHIPS | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Distortion, Wide Bandwidth Voltage Feedback Clamp Amps |
| AD8037AN | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk ±6V 8-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:VLTG-FDBK, G= 2 CLAMP AMP - Bulk 制造商:Analog Devices 功能描述:IC AMP 240MHZ CLAMP 8037 DIP8 |
| AD8037ANZ | 功能描述:IC OPAMP VF ULDIST LN 70MA 8DIP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:CLAMPIN™ 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱(chēng):OP481GRUZ-REELCT |
| AD8037AR | 功能描述:IC OPAMP VF ULDIST LN 70MA 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:CLAMPIN™ 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類(lèi)型:J-FET 電路數(shù):1 輸出類(lèi)型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
| AD8037AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk ±6V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:VLTG-FDBK, G= 2 CLAMP AMP - Tape and Reel |
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