AD8295 Datasheet, PDF (1/28 Pages) Analog Devices – Precision Instrumentation Amplifier with Signal Processing Amplifiers

Precision Instrumentation Amplifier
with Signal Processing Amplifiers
AD8295
FEATURES
Saves board space
Includes precision in-amp, 2 op amps, and
2 matched resistors
4 mm × 4 mm LFCSP
No heat slug for more routing room
Differential output fully specified
In-amp specifications
Gain set with 1 external resistor (gain range: 1 to 1000)
8 nV/√Hz @ 1 kHz, maximum input voltage noise
90 dB minimum CMRR (G = 1)
0.8 nA maximum input bias current
1.2 MHz, −3 dB bandwidth (G = 1)
2 V/μs slew rate
Wide power supply range: ±2.3 V to ±18 V
1 ppm/°C, 0.03% resistor matching
APPLICATIONS
Industrial process controls
Wheatstone bridges
Precision data acquisition systems
Medical instrumentation
Strain gages
Transducer interfaces
Differential output
CONNECTION DIAGRAM
+V_S
OUT A2 +IN A2 –IN
16
15
14
13
AD8295
–IN 1
12 A2 OUT
A2
R_G 2
R_G 3
+IN 4
5
–V_S
11 A1 +IN
IA
10 A1 R1
R1
A1
20kΩ
R2
20kΩ
9 A1 –IN
6
REF
7
8
A1 OUT A1 R2
Figure 1.
Table 1. Instrumentation Amplifiers by Category
General Zero
Purpose Drift
Military Low
Grade
Power
High Speed
PGA
AD8220¹ AD8231¹ AD620
AD627¹ AD8250
AD8221 AD8553¹ AD621
AD623¹ AD8251
AD8222 AD8555¹ AD524
AD8223¹ AD8253
AD8224¹ AD8556¹ AD526
AD8228 AD8557¹ AD624
AD8295 AD8293¹
1 _{Rail-to-rail output.}
GENERAL DESCRIPTION
The AD8295 contains all the components necessary for a
precision instrumentation amplifier front end in one small
4 mm × 4 mm package. It contains a high performance
instrumentation amplifier, two general-purpose operational
amplifiers, and two precisely matched 10 kΩ resistors.
The AD8295 is designed to make PCB routing easy and
efficient. The AD8295 components are arranged in a logical
way so that typical application circuits have short routes and
few vias. Unlike most chip scale packages, the AD8295 does not
have an exposed metal pad on the back of the part, which frees
additional space for routing and vias. The AD8295 comes in a
4 mm × 4 mm LFCSP that requires half the board space of an
8-pin SOIC package.
The AD8295 includes a high performance, programmable gain
instrumentation amplifier. Gain is set from 1 to 1000 with a
single resistor. The low noise and excellent common-mode
rejection of the AD8295 enable the part to easily detect small
signals even in the presence of large common-mode interference.
For a similar instrumentation amplifier without the associated
signal conditioning circuitry, see the AD8221 or AD8222 data
sheet.
The AD8295 operates on both single and dual supplies and is
well suited for applications where ±10 V input voltages are
encountered. Performance is specified over the entire industrial
temperature range of −40°C to +85°C for all grades. The
AD8295 is operational from −40°C to +125°C; see the Typical
Performance Characteristics section for expected operation up
to 125°C.
Rev. 0
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