AD8295 데이터 시트보기 (PDF) - Analog Devices
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AD8295 Datasheet PDF : 28 Pages
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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)
Input voltage noise: 8 nV/√Hz maximum at 1 kHz
CMRR (G = 1): 90 dB minimum
Input bias current: 0.8 nA maximum
−3 dB bandwidth (G = 1): 1.2 MHz
Slew rate: 2 V/μs
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
+VS
OUT A2 +IN A2 –IN
16
15
14
13
AD8295
–IN 1
12 A2 OUT
A2
RG 2
RG 3
+IN 4
5
–VS
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 Category1
General- Zero
Purpose Drift
Military Low
Grade
Power
High Speed
PGA
AD8220 AD8231 AD620 AD8236 AD8250
AD8221 AD8553 AD621 AD627 AD8251
AD8222 AD8555 AD524 AD623 AD8253
AD8224 AD8556 AD526 AD8223
AD8228 AD8557 AD624 AD8226
AD8295 AD8293
AD8227
1 See www.analog.com for the latest selection of instrumentation amplifiers.
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 20 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 logical pin arrange-
ment and routing freedom enable the AD8295 to offer simple
pin-strapped solutions for complex systems in the equivalent
board space of a typical MSOP 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. A
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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