參數資料
型號: AD623BR
廠商: Analog Devices Inc
文件頁數: 8/24頁
文件大?。?/td> 0K
描述: IC AMP INST R-R LP 8SOIC
產品變化通告: Product Discontinuance 27/Oct/2011
標準包裝: 98
放大器類型: 儀表
電路數: 1
輸出類型: 滿擺幅
轉換速率: 0.3 V/µs
-3db帶寬: 800kHz
電流 - 輸入偏壓: 17nA
電壓 - 輸入偏移: 25µV
電流 - 電源: 375µA
電壓 - 電源,單路/雙路(±): 2.7 V ~ 12 V,± 2.5 V ~ 6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 8-SO
包裝: 管件
AD623
Rev. D | Page 16 of 24
APPLICATIONS INFORMATION
BASIC CONNECTION
Figure 42 and Figure 43 show the basic connection circuits for
the AD623. The +VS and VS terminals are connected to the
power supply. The supply can be either bipolar (VS = ±2.5 V to
±6 V) or single supply (VS = 0 V, +VS = 3.0 V to 12 V). Power
supplies should be capacitively decoupled close to the power pins of
the device. For the best results, use surface-mount 0.1 μF ceramic
chip capacitors and 10 μF electrolytic tantalum capacitors.
0
077
8-
0
42
RG
VIN
OUTPUT
VOUT
REF
RG
REF (INPUT)
+2.5V TO +6V
+VS
10F
0.1F
–2.5V TO –6V
–VS
10F
0.1F
Figure 42. Dual-Supply Basic Connection
00
77
8-
0
55
RG
VIN
OUTPUT
VOUT
REF
RG
REF (INPUT)
+3V TO +12V
+VS
10F
0.1F
Figure 43. Single-Supply Basic Connection
The input voltage, which can be either single-ended (tie either
IN or +IN to ground), or differential is amplified by the
programmed gain. The output signal appears as the voltage
difference between the OUTPUT pin and the externally applied
voltage on the REF input. For a ground-referenced output, REF
should be grounded.
GAIN SELECTION
The gain of the AD623 is resistor programmed by RG, or more
precisely, by whatever impedance appears between Pin 1 and
Pin 8. The AD623 is designed to offer accurate gains using 0.1%
to 1% tolerance resistors. Table 5 shows the required values of
RG for the various gains. Note that for G = 1, the RG terminals
are unconnected (RG = ∞). For any arbitrary gain, RG can be
calculated by
RG
= 100 kΩ/(G 1)
REFERENCE TERMINAL
The reference terminal potential defines the zero output voltage
and is especially useful when the load does not share a precise
ground with the rest of the system. It provides a direct means of
injecting a precise offset to the output. The reference terminal is
also useful when bipolar signals are being amplified because it
can be used to provide a virtual ground voltage. The voltage on
the reference terminal can be varied from VS to +VS.
Table 5. Required Values of Gain Resistors
Desired Gain
1% Standard Table Value of RG (Ω)
Calculated Gain Using 1% Resistors
2
100 k
2
5
24.9 k
5.02
10
11 k
10.09
20
5.23 k
20.12
33
3.09 k
33.36
40
2.55 k
40.21
50
2.05 k
49.78
65
1.58 k
64.29
100
1.02 k
99.04
200
499
201.4
500
200
501
1000
100
1001
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