AD8276BRZ-RL Analog Devices Inc, AD8276BRZ-RL Datasheet - Page 13

• Manufacturer Part Number: AD8276BRZ-RL
• Description: Single G=1 LowPower,WideInputRange
• Manufacturer: Analog Devices Inc

Specifications of AD8276BRZ-RL

• Design Resources: High Precision, Low Cost Current Sources Using AD8276 and AD8603 (CN0099)
• Amplifier Type: Differential
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 1.1 V/µs
• Gain Bandwidth Product: 550kHz
• Voltage - Input Offset: 100µV
• Current - Supply: 200µA
• Current - Output / Channel: 15mA
• Voltage - Supply, Single/dual (±): 2 V ~ 36 V, ±2 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Current - Input Bias: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
CONFIGURATIONS
The AD8276 can be configured in several ways; see Figure 38
to Figure 42. All of these configurations have excellent gain
accuracy and gain drift because they rely on the internal
matched resistors. Note that Figure 39 shows the AD8276
as a difference amplifier with a midsupply reference voltage
at the noninverting input. This allows the AD8276 to be used
as a level shifter.
As with the other inputs, the reference must be driven with a
low impedance source to maintain the internal resistor ratio.
An example using the low power, low noise OP1177 as a
reference is shown in Figure 37.
Figure 39. Difference Amplifier, Gain = 1, Referenced to Midsupply
V
V
–IN
+IN
OUT
INCORRECT
Figure 38. Difference Amplifier, Gain = 1
Figure 40. Inverting Amplifier, Gain = −1
V
+IN
–IN
V
AD8276
IN
OUT
= V
Figure 37. Driving the Reference Pin
2
3
OUT
IN+
REF
40kΩ
40kΩ
1
= V
2
3
2
3
= –V
− V
IN+
40kΩ
40kΩ
40kΩ
40kΩ
40kΩ
IN−
IN
− V
IN−
40kΩ
40kΩ
40kΩ
40kΩ
40kΩ
V
5
6
1
V
+
OP1177
–
REF
5
6
5
6
1
CORRECT
OUT
= MIDSUPPLY
AD8276
OUT
OUT
REF
Rev. 0 | Page 13 of 16
DIFFERENTIAL OUTPUT
Certain systems require a differential signal for better perfor-
mance, such as the inputs to differential analog-to-digital
converters. Figure 43 shows how the AD8276 can be used to
convert a single-ended output from an
amplifier into a differential signal. The AD8276 internal matched
resistors at the inverting input maximize gain accuracy while
generating a differential signal. The resistors at the noninverting
input can be used as a divider to set and track the common-mode
voltage accurately to midsupply, especially when running on a
single supply or in an environment where the supply fluctuates.
The resistors at the noninverting input can also be shorted and
set to any appropriate bias voltage. Note that the V
node indicated in Figure 43 is internal to the AD8276 because
it is not pinned out.
The differential output voltage and common-mode voltage of
the AD8226 is shown in the following equations:
Refer to the AD8226 data sheet for additional information.
Figure 43. Differential Output With Supply Tracking on Common-Mode
V
V
DIFF_OUT
CM
= ( V
+IN
–IN
= V
S+
Figure 41. Noninverting Amplifier, Gain = 1
Figure 42. Noninverting Amplifier, Gain = 2
V
IN
V
− V
OUT
IN
OUT
+OUT
AD8226
V
S−
= V
= 2V
2
3
REF
2
1
3
)/2 = V
− V
IN
40kΩ
40kΩ
IN
40kΩ
40kΩ
40kΩ
R
R
Voltage Reference
−OUT
BIAS
AD8276
= Gain
40kΩ
40kΩ
40kΩ
V
AD8226
V
AD8226
6
1
5
S
S
5
6
+
–
R
R
V
× ( V
OUT
OUT
BIAS
instrumentation
= V
+IN
+OUT
–OUT
CM
– V
BIAS
AD8276
−IN
= V
)
CM