VIN VOUT
參數資料
型號: AD706ARZ
廠商: Analog Devices Inc
文件頁數: 10/12頁
文件大?。?/td> 0K
描述: IC OPAMP GP DUAL PREC 15MA 8SOIC
標準包裝: 98
放大器類型: 通用
電路數: 2
轉換速率: 0.15 V/µs
-3db帶寬: 800kHz
電流 - 輸入偏壓: 50pA
電壓 - 輸入偏移: 30µV
電流 - 電源: 750µA
電流 - 輸出 / 通道: 15mA
電壓 - 電源,單路/雙路(±): 4 V ~ 36 V,±2 V ~ 18 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
產品目錄頁面: 773 (CN2011-ZH PDF)
REV. E
AD706
–7–
10k
+
AD706
+
0.1F
8
4
VIN
VOUT
+VS
10k
CL
1/2
0.1 F
RL
2.5k
SQUARE
WAVE
INPUT
–VS
Figure 5a. Unity Gain Inverter Connection
Figure 5b. Unity Gain Inverter Large
Signal Pulse Response, CL = 1,000 pF
Figure 5c. Unity Gain Inverter Small
Signal Pulse Response, CL = 100 pF
Figure 5d. Unity Gain Inverter Small
Signal Pulse Response, CL = 1000 pF
Figure 6 shows an in-amp circuit that has the obvious advantage
of requiring only one AD706, rather than three op amps, with
subsequent savings in cost and power consumption. The transfer
function of this circuit (without RG) is
VV
V
R
OUT
IN1
IN2
=
+
() 1
4
3
for R1 = R4 and R2 = R3.
Input resistance is high, thus permitting the signal source to
have an unbalanced output impedance.
+VS
0.1 F
1k
+
A1
AD706
1/2
RP*
1k
49.9k
R2
R3
R4
VIN1
RG (OPTIONAL)
R1
49.9k
A2
+
0.1 F
AD706
1/2
OUTPUT
*OPTIONAL INPUT PROTECTION RESISTOR FOR GAINS GREATER
THAN 100 OR INPUT VOLTAGES EXCEEDING THE SUPPLY VOLTAGE.
VOUT = (VIN1 – VIN2) (1+
) + (
)
FOR R1 = R4, R2 = R3
R4
R3
2R4
RG
–VS
RP*
VIN2
3
2
8
1
5
6
7
4
Figure 6. Two Op Amp Instrumentation Amplifier
Furthermore, the circuit gain may be fine trimmed using an
optional trim resistor, RG. Like the three op amp circuit, CMR
increases with gain, once initial trimming is accomplished—but
CMR is still dependent upon the ratio matching of Resistors R1
through R4. Resistor values for this circuit, using the optional
gain resistor, RG, can be calculated using
R1
= R4 = 49.9 k
R2
= R3 =
49.9 k
0.9 G
1
RG
=
99.8 k
0.06 G
where G = The desired circuit gain.
Table I provides practical 1% resistance values. Note that
without resistor RG, R2 and R3 = 49.9 k
/G–1.
Table I. Operating Gains of Amplifiers A1 and A2 and
Practical 1% Resistor Values for the Circuit of Figure 6
Circuit Gain
Gain of A1
Gain of A2
R2, R3
R1, R4
1.10
11.00
1.10
499 k
49.9 k
1.33
4.01
1.33
150 k
49.9 k
1.50
3.00
1.50
100 k
49.9 k
2.00
49.9 k
49.9 k
10.1
1.11
10.10
5.49 k
49.9 k
101.0
1.01
101.0
499
49.9 k
1001
1.001
1001
49.9
49.9 k
For a much more comprehensive discussion of in-amp applica-
tions, refer to the Instrumentation Amplifier Applications Guide
available free from Analog Devices, Inc.
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