AD706AR Analog Devices Inc, AD706AR Datasheet - Page 7

• Manufacturer Part Number: AD706AR
• Description: Operational Amplifier IC Number Of Amplifiers:2
• Manufacturer: Analog Devices Inc

Specifications of AD706AR

• Bandwidth: 0.8MHz
• Slew Rate: 0.15V/us
• Package/case: 8-SOIC
• Leaded Process Compatible: No
• Amplifier Type: Bias Current
• Mounting Type: Surface Mount
• Offset Voltage: 0.1mV
• Rohs Status: RoHS non-compliant
• Number Of Circuits: 2
• -3db Bandwidth: 800kHz
• Current - Input Bias: 50pA
• Voltage - Input Offset: 30µV
• Current - Supply: 750µA
• Current - Output / Channel: 15mA
• Voltage - Supply, Single/dual (±): 4 V ~ 36 V, ±2 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 5b. Unity Gain Inverter Large
Signal Pulse Response, C
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 R
for R1 = R4 and R2 = R3.
Input resistance is high, thus permitting the signal source to
have an unbalanced output impedance.
Furthermore, the circuit gain may be fine trimmed using an
optional trim resistor, R
increases with gain, once initial trimming is accomplished—but
REV. E
V
V
IN2
IN1
Figure 6. Two Op Amp Instrumentation Amplifier
*OPTIONAL INPUT PROTECTION RESISTOR FOR GAINS GREATER
49.9k
THAN 100 OR INPUT VOLTAGES EXCEEDING THE SUPPLY VOLTAGE.
R1
1k
R
1k
R
P
P
*
*
V
V
FOR R1 = R4, R2 = R3
2
3
OUT
OUT
+V
–
+
S
A1
= (V
8
AD706
1/2
R2
=
0.1 F
IN1
G
(
R
– V
V
. Like the three op amp circuit, CMR
G
1
IN1
(OPTIONAL)
IN2
L
) (1+
= 1,000 pF
−
V
R3
R4
R3
IN2
G
) is
) + (
) 1



2R4
R
G
5
6
+
)
V
–
+
–V
SQUARE
WAVE
INPUT
IN
49.9k
R
R
A2
Figure 5a. Unity Gain Inverter Connection
S
R4
1/2
AD706
4
4
3
Figure 5c. Unity Gain Inverter Small
Signal Pulse Response, C



10k
7
0.1 F
OUTPUT
+
–
AD706
1/2
+V
–V
10k
–7–
8
4
S
S
CMR is still dependent upon the ratio matching of Resistors R1
through R4. Resistor values for this circuit, using the optional
gain resistor, R
where G = The desired circuit gain.
Table I provides practical 1% resistance values. Note that
without resistor R
Circuit Gain
1.10
1.33
1.50
2.00
10.1
101.0
1001
For a much more comprehensive discussion of in-amp applica-
tions, refer to the Instrumentation Amplifier Applications Guide—
available free from Analog Devices, Inc.
0.1µF
+
Practical 1% Resistor Values for the Circuit of Figure 6
Table I. Operating Gains of Amplifiers A1 and A2 and
0.1 F
L
= 100 pF
2.5k
R
L
G
, can be calculated using
Gain of A1 Gain of A2 R2, R3
11.00
4.01
3.00
2.00
1.11
1.01
1.001
G
V
C
, R2 and R3 = 49.9 kΩ/G–1.
OUT
L
R1= R4 = 49.9 kΩ
R2 = R3 =
R
Figure 5d. Unity Gain Inverter Small
Signal Pulse Response, C
G
=
99.8 kΩ
0.06 G
1.10
1.33
1.50
2.00
10.10
101.0
1001
0.9 G −1
49.9 kΩ
499 kΩ
150 kΩ
100 kΩ
49.9 kΩ
5.49 kΩ
499 Ω
49.9 Ω
AD706
L
= 1000 pF
R1, R4
49.9 kΩ
49.9 kΩ
49.9 kΩ
49.9 kΩ
49.9 kΩ
49.9 kΩ
49.9 kΩ