参数资料
| 型号： | AD624CD |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST 25MHZ PREC LN 16CDIP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 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 |
REV. C
AD624
–11–
By establishing a reference at the “low” side of a current setting
resistor, an output current may be defined as a function of input
voltage, gain and the value of that resistor. Since only a small
current is demanded at the input of the buffer amplifier A2, the
forced current IL will largely flow through the load. Offset and
drift specifications of A2 must be added to the output offset and
drift specifications of the IA.
PROGRAMMABLE GAIN
Figure 38 shows the AD624 being used as a software program-
mable gain amplifier. Gain switching can be accomplished with
mechanical switches such as DIP switches or reed relays. It
should be noted that the “on” resistance of the switch in series
with the internal gain resistor becomes part of the gain equation
and will have an effect on gain accuracy.
A significant advantage in using the internal gain resistors in a
programmable gain configuration is the minimization of thermo-
couple signals which are often present in multiplexed data
acquisition systems.
If the full performance of the AD624 is to be achieved, the user
must be extremely careful in designing and laying out his circuit
to minimize the remaining thermocouple signals.
The AD624 can also be connected for gain in the output stage.
Figure 39 shows an AD547 used as an active attenuator in the
output amplifier’s feedback loop. The active attenuation pre-
sents a very low impedance to the feedback resistors therefore
minimizing the common-mode rejection ratio degradation.
Another method for developing the switching scheme is to use a
DAC. The AD7528 dual DAC which acts essentially as a pair of
switched resistive attenuators having high analog linearity and
symmetrical bipolar transmission is ideal in this application. The
multiplying DAC’s advantage is that it can handle inputs of
either polarity or zero without affecting the programmed gain.
The circuit shown uses an AD7528 to set the gain (DAC A) and
to perform a fine adjustment (DAC B).
VDD GND
225.3
124
4445.7
80.2
50
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
10k
20k
VB
20k
10k
50
–VS
+VS
1 F
35V
–IN
+IN
10k
INPUT
OFFSET
NULL
OUTPUT
OFFSET
NULL
10k
TO –V
(+INPUT)
(–INPUT)
VOUT
39.2k
WR
A4
A3
A2
A1
VSS
1k
10pF
+VS
28.7k
316k
1k
–VS
AD624
AD7590
AD711
Figure 39. Programmable Output Gain
225.3
124
4445.7
80.2
50
G = 100
K1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
10k
20k
VB
20k
10k
50
–VS
+VS
1 F
35V
–IN
+IN
R2
10k
R1
10k
INPUT
OFFSET
TRIM
OUTPUT
OFFSET
TRIM
RELAY
SHIELDS
G = 200
K2
G = 500
K3
D1
D2
D3
Y0
K2
K3
74LS138
DECODER
7407N
BUFFER
DRIVER
A
B
Y1
Y2
INPUTS
GAIN
RANGE
+5V
10 F
C1
C2
K1 – K3 =
THERMOSEN DM2C
4.5V COIL
D1 – D3 = IN4148
ANALOG
COMMON
GAIN TABLE
A
B
GAIN
0
100
0
1
500
1
0
200
11
1
LOGIC
COMMON
K1
OUT
10k
+5V
AD624
NC
Figure 38. Gain Programmable Amplifier
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相关代理商/技术参数 |
参数描述 |
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| AD624CDZ | 功能描述:IC AMP INST 25MHZ PREC LN 16CDIP 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 |
| 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 |
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