参数资料
| 型号： | AD624CDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/17页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST 25MHZ PREC LN 16CDIP |
| 标准包装： | 1 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 转换速率： | 5 V/µs |
| 增益带宽积： | 25MHz |
| -3db带宽： | 1MHz |
| 电流 - 输入偏压： | 15nA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 3.5mA |
| 电压 - 电源，单路/双路(±)： | ±6 V ~ 18 V |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-CDIP 侧面铜焊 |
| 包装： | 管件 |
| 产品目录页面： | 770 (CN2011-ZH PDF) |
REV. C
AD624
–10–
GROUNDING
Many data-acquisition components have two or more ground
pins which are not connected together within the device. These
grounds must be tied together at one point, usually at the sys-
tem power supply ground. Ideally, a single solid ground would
be desirable. However, since current flows through the ground
wires and etch stripes of the circuit cards, and since these paths
have resistance and inductance, hundreds of millivolts can be
generated between the system ground point and the data acqui-
sition components. Separate ground returns should be provided
to minimize the current flow in the path from the most sensitive
points to the system ground point. In this way supply currents
and logic-gate return currents are not summed into the same
return path as analog signals where they would cause measure-
ment errors (see Figure 34).
OUTPUT
REFERENCE
ANALOG
GROUND*
*IF INDEPENDENT, OTHERWISE RETURN AMPLIFIER REFERENCE
TO MECCA AT ANALOG P.S. COMMON
SIGNAL
GROUND
AD574A
DIGITAL
DATA
OUTPUT
+
1 F
0.1
F
1 F
DIG
COM
0.1
F
0.1
F
0.1
F
AD624
SAMPLE
AND HOLD
AD583
ANALOG P.S.
+15V C –15V
+5V
DIGITAL P.S.
C
Figure 34. Basic Grounding Practice
Since the output voltage is developed with respect to the poten-
tial on the reference terminal an instrumentation amplifier can
solve many grounding problems.
SENSE TERMINAL
The sense terminal is the feedback point for the instrument
amplifier’s output amplifier. Normally it is connected to the
instrument amplifier output. If heavy load currents are to be
drawn through long leads, voltage drops due to current flowing
through lead resistance can cause errors. The sense terminal can
be wired to the instrument amplifier at the load thus putting the
IxR drops “inside the loop” and virtually eliminating this error
source.
AD624
V+
OUTPUT
CURRENT
BOOSTER
V–
VIN+
VIN–
X1
RL
(REF)
(SENSE)
Figure 35. AD624 Instrumentation Amplifier with Output
Current Booster
Typically, IC instrumentation amplifiers are rated for a full
±10 volt output swing into 2 k. In some applications, how-
ever, the need exists to drive more current into heavier loads.
Figure 35 shows how a current booster may be connected
“inside the loop” of an instrumentation amplifier to provide the
required current without significantly degrading overall perfor-
mance. The effects of nonlinearities, offset and gain inaccuracies
of the buffer are reduced by the loop gain of the IA output
amplifier. Offset drift of the buffer is similarly reduced.
REFERENCE TERMINAL
The reference terminal may be used to offset the output by up
to
±10 V. This is useful when the load is “floating” or does not
share a ground with the rest of the system. It also provides a
direct means of injecting a precise offset. It must be remem-
bered that the total output swing is
±10 volts, from ground, to
be shared between signal and reference offset.
AD624
VIN+
VIN–
REF
SENSE
LOAD
AD711
–VS
+VS
VOFFSET
Figure 36. Use of Reference Terminal to Provide Output
Offset
When the IA is of the three-amplifier configuration it is neces-
sary that nearly zero impedance be presented to the reference
terminal. Any significant resistance, including those caused by
PC layouts or other connection techniques, which appears
between the reference pin and ground will increase the gain of
the noninverting signal path, thereby upsetting the common-
mode rejection of the IA. Inadvertent thermocouple connections
created in the sense and reference lines should also be avoided
as they will directly affect the output offset voltage and output
offset voltage drift.
In the AD624 a reference source resistance will unbalance the
CMR trim by the ratio of 10 k
/R
REF. For example, if the refer-
ence source impedance is 1
, CMR will be reduced to 80 dB
(10 k
/1 = 80 dB). An operational amplifier may be used to
provide that low impedance reference point as shown in Figure
36. The input offset voltage characteristics of that amplifier will
add directly to the output offset voltage performance of the
instrumentation amplifier.
An instrumentation amplifier can be turned into a voltage-to-
current converter by taking advantage of the sense and reference
terminals as shown in Figure 37.
AD624
+INPUT
REF
R1
+VX–
SENSE
LOAD
AD711
A2
IL
–INPUT
40.000
RG
1 +
IL =
=
VX
R1
VIN
R1
Figure 37. Voltage-to-Current Converter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD624S | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Instrumentation Amplifier |
| AD624SCHIPS | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Instrumentation Amplifier |
| AD624SD | 功能描述:IC AMP INST 25MHZ PREC LN 16CDIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:TS1854A View All Specifications 标准包装:50 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.25 V/µs 增益带宽积:630kHz -3db带宽:- 电流 - 输入偏压:16nA 电压 - 输入偏移:1000µV 电流 - 电源:162µA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 |
| AD624SD/883B | 功能描述:仪表放大器 LOW NOISE PRECISION IN AM RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| AD625 | 制造商:AD 制造商全称:Analog Devices 功能描述:Programmable Gain Instrumentation Amplifier |
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