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| 型號： | AD624CD |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST 25MHZ PREC LN 16CDIP |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 5 V/µs |
| 增益帶寬積： | 25MHz |
| -3db帶寬： | 1MHz |
| 電流 - 輸入偏壓： | 15nA |
| 電壓 - 輸入偏移： | 25µV |
| 電流 - 電源： | 3.5mA |
| 電壓 - 電源，單路/雙路(±)： | ±6 V ~ 18 V |
| 工作溫度： | -25°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-CDIP（0.300"，7.62mm） |
| 供應商設備封裝： | 16-CDIP 側(cè)面銅焊 |
| 包裝： | 管件 |
REV. C
AD624
–11–
By establishing a reference at the “l(fā)ow” 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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| AD624CDZ | 功能描述:IC AMP INST 25MHZ PREC LN 16CDIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD624S | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Instrumentation Amplifier |
| AD624SCHIPS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Instrumentation Amplifier |
| AD624SD | 功能描述:IC AMP INST 25MHZ PREC LN 16CDIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有關文件:TS1854A View All Specifications 標準包裝:50 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.25 V/µs 增益帶寬積:630kHz -3db帶寬:- 電流 - 輸入偏壓:16nA 電壓 - 輸入偏移:1000µV 電流 - 電源:162µA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:管件 |
| AD624SD/883B | 功能描述:儀表放大器 LOW NOISE PRECISION IN AM RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
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