AD8235_16 Datasheet, PDF (1/21 Pages) Analog Devices – 40 μA Micropower Instrumentation Amplifier in WLCSP Package

Data Sheet
40 μA Micropower Instrumentation
Amplifier in WLCSP Package
AD8235
FEATURES
Low power
40 μA maximum supply current
6 nA shutdown current
Low input currents
50 pA input bias current
25 pA input offset current
High Common Mode Rejection Ratio (CMRR)
110 dB CMRR , G = 100
Space saving
WLCSP package
Zero input crossover distortion
Versatile
Rail-to-rail input and output
Shutdown
Gain set with single resistor (G = 5 to 200)
AD8236: μSOIC package version of AD8235
APPLICATIONS
Medical instrumentation
Low-side current sense
Portable electronics
GENERAL DESCRIPTION
The AD8235 is the smallest and lowest power instrumentation
amplifier in the industry. It is available in a 1.5 mm × 2.2 mm
wafer level chip scale package (WLCSP). The AD8235 draws
a maximum quiescent current of 40 μA. In addition, it draws a
maximum 500 nA of current during shutdown mode, making
it an excellent instrumentation amplifier for battery powered,
portable applications.
The AD8235 can operate on supply voltages as low as 1.8 V. The
input stage allows for wide rail-to-rail input voltage range without
the crossover distortion, common in other designs. The rail-to-
rail output enables easy interfacing to ADCs.
The AD8235 is an excellent choice for signal conditioning. Its
low input bias current of 50 pA and high CMRR of 110 dB
(G = 100) offer tremendous value for its size and low power.
It is specified over the extended industrial temperature range of
−40°C to 125°C.
Rev. A
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CONNECTION DIAGRAM
R_G
RG
B3
RG
+V_S
C3
A1
ESD
PROTECTION
ESD
PROTECTION
REF C1
ESD
PROTECTION _210kΩ
52.5kΩ
52.5kΩ
210kΩ
–V_S
D1
A2 SDN
NC B2
NC D2
OP AMP
A
OP AMP
B
ESD
PROTECTION
B1 V_OUT
ESD
PROTECTION
ESD
PROTECTION
A3
D3
–IN
+IN
Figure 1.
AD8235
PIN CONFIGURATION
BALL A1
INDICATOR
1
2
3
+V_S SDN –IN
A
V_{OUT NC RG}
B
REF
RG
C
–V_S NC +IN
D
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
NC = NO CONNECT
Figure 2. 11-Ball WLCSP (CB-11-1)
5.0
4.5
4.0
G=5
V_S = 5V
3.5
V_REF = 2.5V
3.0
2.5
2.0
1.5
G=5
1.0
V_S = 1.8V
V_REF = 0.9V
0.5
0
–0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT VOLTAGE (V)
Figure 3. Wide Common-Mode Voltage Range vs. Output Voltage
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