VB 50 20k 10k AD624 G = 100 G = 200 G = 500
參數(shù)資料
型號： AD624CDZ
廠商： Analog Devices Inc
文件頁數(shù)： 5/17頁
文件大?。?/td> 0K
描述： IC AMP INST 25MHZ PREC LN 16CDIP
標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝： 16-CDIP 側(cè)面銅焊
包裝： 管件
產(chǎn)品目錄頁面： 770 (CN2011-ZH PDF)
REV. C
AD624
–12–
225.3
124
4445.7
80.2
50
VB
50
20k
10k
AD624
G = 100
G = 200
G = 500
RG1
RG2
–INPUT
(+INPUT)
VOUT
20k
10k
+INPUT
(–INPUT)
AD7528
1/2
AD712
256:1
DATA
INPUTS
CS
WR
DAC A/DAC B
DB0
DB7
+VS
DAC A
DAC B
1/2
AD712
Figure 40. Programmable Output Gain Using a DAC
AUTOZERO CIRCUITS
In many applications it is necessary to provide very accurate
data in high gain configurations. At room temperature the offset
effects can be nulled by the use of offset trimpots. Over the
operating temperature range, however, offset nulling becomes a
problem. The circuit of Figure 41 shows a CMOS DAC operat-
ing in the bipolar mode and connected to the reference terminal
to provide software controllable offset adjustments.
AD624
–VS
+VS
VOUT
G = 100
G = 200
G = 500
RG1
RG2
+INPUT
–INPUT
DATA
INPUTS
CS
WR
MSB
LSB
+VS
AD7524
C1
OUT1
OUT2
1/2
AD712
RFB
+VS
R3
20k
R4
10k
R5
20k
–VS
R6
5k
–VS
GND
AD589
39k
VREF
1/2
AD712
Figure 41. Software Controllable Offset
In many applications complex software algorithms for autozero
applications are not available. For these applications Figure 42
provides a hardware solution.
AD624
–VS
+VS
VOUT
RG1
RG2
1k
12 11
910
0.1 F LOW
LEAKAGE
CH
15
16
14
13
VSS
VDD
GND
A1
A2
A3
A4
AD7510DIKD
200 s
ZERO PULSE
AD542
Figure 42. Autozero Circuit
The microprocessor controlled data acquisition system shown in
Figure 43 includes includes both autozero and autogain capabil-
ity. By dedicating two of the differential inputs, one to ground
and one to the A/D reference, the proper program calibration
cycles can eliminate both initial accuracy errors and accuracy
errors over temperature. The autozero cycle, in this application,
converts a number that appears to be ground and then writes
that same number (8 bit) to the AD624 which eliminates the
zero error since its output has an inverted scale. The autogain
cycle converts the A/D reference and compares it with full scale.
A multiplicative correction factor is then computed and applied
to subsequent readings.
RG1
RG2
AD624
1/2
AD712
AD583
AGND
VIN
VREF
AD574A
AD7507
EN A1
A2
A0
ADDRESS BUS
–VREF
5k
10k
20k
LATCH
20k
1/2
AD712
CONTROL
DECODE
AD7524
MICRO-
PROCESSOR
Figure 43. Microprocessor Controlled Data Acquisition
System
相關(guān)PDF資料
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