Datasheet AD8235 (Analog Devices)

40 μA Micropower Instrumentation Amplifier in WLCSP Package Data Sheet AD8235 FEATURES CONNECTION DIAGRAM Low power RG +V –V RG RG S S 40 μA maximum supply current B3 C3 A1 D1 6 nA shutdown current ESD ESD Low input currents PROTECTION PROTECTION A2 SDN 50 pA input bias current ESD REF C1 25 pA input offset current PROTECTION 210kΩ 52.5kΩ 52.5kΩ 210kΩ High Common Mode Rejection Ratio (CMRR) 110 dB CMRR , G = 100 OP AMP ESD NC B2 A OP AMP B1 VOUT Space saving PROTECTION B WLCSP package NC D2 ESD ESD Zero input crossover distortion PROTECTION PROTECTION AD8235 Versatile
1
A3 D3
-00
Rail-to-rail input and output –IN +IN
11 82 0
Shutdown
Figure 1.
Gain set with single resistor (G = 5 to 200) AD8236: μSOIC package version of AD8235 PIN CONFIGURATION BALL A1 APPLICATIONS INDICATOR 1 2 3 Medical instrumentation +V SDN –IN Low-side current sense S A Portable electronics VOUT NC RG GENERAL DESCRIPTION B REF RG
The AD8235 is the smallest and lowest power instrumentation
C
amplifier in the industry. It is available in a 1.5 mm × 2.2 mm
–VS NC +IN
wafer level chip scale package (WLCSP). The AD8235 draws 4 -00
D
1 1 a maximum quiescent current of 40 μA. In addition, it draws a 2 08
TOP VIEW
maximum 500 nA of current during shutdown mode, making
(BALL SIDE DOWN)
it an excellent instrumentation amplifier for battery powered,
Not to Scale NC = NO CONNECT
portable applications. Figure 2. 11-Ball WLCSP (CB-11-1) The AD8235 can operate on supply voltages as low as 1.8 V. The
5.0
input stage allows for wide rail-to-rail input voltage range without
4.5
the crossover distortion, common in other designs. The rail-to-
) V ( G = 5
rail output enables easy interfacing to ADCs.
E 4.0 G V A S = 5V 3.5 VREF = 2.5V
The AD8235 is an excellent choice for signal conditioning. Its
LT O V
low input bias current of 50 pA and high CMRR of 110 dB
3.0 E
(G = 100) offer tremendous value for its size and low power.
OD 2.5 -M ON
It is specified over the extended industrial temperature range of
2.0 M M
−40°C to 125°C.
O 1.5 C T G = 5 U 1.0 V P S = 1.8V V IN REF = 0.9V 0.5 0
2
–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
-00
OUTPUT VOLTAGE (V)
11 82 0 Figure 3. Wide Common-Mode Voltage Range vs. Output Voltage
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION CONNECTION DIAGRAM PIN CONFIGURATION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BASIC OPERATION GAIN SELECTION SHUTDOWN FEATURE LAYOUT RECOMMENDATIONS Pad Opening Pad Type Pad Finish Board Thickness Grounding REFERENCE TERMINAL POWER SUPPLY REGULATION AND BYPASSING INPUT BIAS CURRENT RETURN PATH INPUT PROTECTION RF INTERFERENCE COMMON-MODE INPUT VOLTAGE RANGE APPLICATIONS INFORMATION AC-COUPLED INSTRUMENTATION AMPLIFIER LOW POWER HEART RATE MONITOR OUTLINE DIMENSIONS ORDERING GUIDE