AD822AR-REEL7 Analog Devices Inc, AD822AR-REEL7 Datasheet - Page 20

• Manufacturer Part Number: AD822AR-REEL7
• Description: IC OPAMP GP R-R 1.9MHZ LP 8SOIC
• Manufacturer: Analog Devices Inc
• Type: General Purpose Amplifierr

Specifications of AD822AR-REEL7

• Slew Rate: 3 V/µs
• Rohs Status: RoHS non-compliant
• Design Resources: 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0064)
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 1.9MHz
• -3db Bandwidth: 1.9MHz
• Current - Input Bias: 2pA
• Voltage - Input Offset: 400µV
• Current - Supply: 1.4mA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 3 V ~ 36 V, ±1.5 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: Low Power
• No. Of Amplifiers: 2
• Bandwidth: 1.8MHz
• Supply Voltage Range: ± 1.5V To ± 18V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Rail/rail I/o Type: Rail to Rail Output
• Number Of Elements: 2
• Unity Gain Bandwidth Product: 1.8MHz
• Common Mode Rejection Ratio: 66dB
• Input Offset Voltage: 0.8@5VmV
• Input Bias Current: 25pA
• Single Supply Voltage (typ): 9/12/15/18/24/28V
• Dual Supply Voltage (typ): ±3/±5/±9/±12V
• Voltage Gain In Db: 120dB
• Power Supply Rejection Ratio: 66dB
• Power Supply Requirement: Single/Dual
• Shut Down Feature: No
• Single Supply Voltage (min): 5V
• Single Supply Voltage (max): 30V
• Dual Supply Voltage (min): ±2.5V
• Dual Supply Voltage (max): ±15V
• Technology: BiFET
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / Rohs Status: Not Compliant
• Other names: AD822AR-REEL7TR

AD822
SINGLE-SUPPLY PROGRAMMABLE GAIN
INSTRUMENTATION AMPLIFIER
The AD822 can be configured as a single-supply instrumenta-
tion amplifier that is able to operate from single supplies down
to 3 V or dual supplies up to ±15 V. Using only one AD822 rather
than three separate op amps, this circuit is cost and power efficient.
The 2 pA bias currents of the AD822 FET inputs minimize
offset errors caused by high unbalanced source impedances.
An array of precision thin film resistors sets the in-amp gain to
be either 10 or 100. These resistors are laser trimmed to ratio
match to 0.01% and have a maximum differential TC of 5 ppm/°C.
Table 6. In-Amp Performance
Parameters
CMRR
Common-Mode Voltage Range
3 dB BW
t
Noise @ f = 1 kHz
I
SUPPLY
SETTLING
G = 10
G = 100
G = 10
G = 100
2 V Step
5 V Step
Figure 48. Pulse Response of In-Amp to a 500 mV p-p Input Signal;
(Total)
100
0%
10
90
. . . .
. . . .
. . . .
. . . .
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1V
V
S
= 5 V, 0 V; Gain = 0
. . . . . . . . . . . . . . . . . . .
V
74 dB
−0.2 V to +2 V
180 kHz
18 kHz
2 μs
270 nV/√Hz
2.2 μV/√Hz
1.10 mA
S
= 3 V, 0 V
5µs
V
80 dB
−5.2 V to +4 V
180 kHz
18 kHz
5 μs
270 nV/√Hz
2.2 μV/√Hz
1.15 mA
S
= ±5 V
Rev. I | Page 20 of 24
V
V
LOW DROPOUT BIPOLAR BRIDGE DRIVER
The AD822 can be used for driving a 350 Ω Wheatstone bridge.
Figure 50 shows one-half of the AD822 being used to buffer the
AD589, a 1.235 V low power reference. The output of 4.5 V can
be used to drive an analog-to-digital converter (ADC) front end.
The other half of the AD822 is configured as a unity-gain inverter
and generates the other bridge input of −4.5 V. Resistor R1 and
Resistor R2 provide a constant current for bridge excitation. The
AD620
the differential output voltage of the bridge. The gain of the AD620
is programmed using an external resistor R
IN1
IN2
V
REF
Figure 49. A Single-Supply Programmable Instrumentation Amplifier
10kΩ 1%
G
+1.235V
10kΩ 1%
+
49.9kΩ
–
+
–
1kΩ
AD589
R
low power instrumentation amplifier is used to condition

P
49
1kΩ
90kΩ
R
G = 10
R1
P
9 .
R
3
2
6
5
Figure 50. Low Dropout Bipolar Bridge Driver
G
(G = 10) V
(G = 100) V
+
–
–
+
AD822
AD822
k
2
3
25.4kΩ 1%
10kΩ 1%

1/2
1/2
–
AD822
+
8
V+
9kΩ
R2
V+
1/2

350Ω
350Ω
4
1
G = 100
OUT
OUT
1kΩ
0.1µF
R3
= (V
1
7
= (V
1
IN1
R1
20Ω
–4.5V
R2
20Ω
IN1
350Ω
350Ω
– V
1kΩ
G = 100
R4
– V
V–
IN2
TO A/D CONVERTER
REFERENCE INPUT
IN2
)
6
5
(
)
(
1+
R
–
+
9kΩ
AD822
1+
R5
G
R4 + R5
1/2
R5 + R6
GND
2
3
R6
V+
V–
G = 10
R4
–
+
4
0.1μF
0.1μF
90kΩ
G
AD620
R6
4
–V
and determined by
)
+V
7
)
S
+V
7
V
5
+V
S
+
+
REF
REF
REF
+
+
6
+
–
1μF
1μF
OHMTEK
PART # 1043
V
OUT
+5V
–5V