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LNDINA333A/B/C
INA333 Footprint Compatible Instrumentation
Amplifiers (INA) use 50% Less Current
GENERAL DESCRIPTION
The LNDINA333A/B/C are precision instrumentation
amplifiers designed to be footprint compatible with the TI
INA333. Although the LNDINA333 are footprint compatible
they offer similar performance to the INA333 with a 30%
reduction in power consumption (25uA typical and 30uA
maximum vs. 50uA typical and 80uA maximum for the
INA333). The LNDINA333A has a single ended output
replicating the INA333A while the outputs of LNDINA333B/C
are fully differential.
If an RG resistor is connected between the RG pins then the
differential current will be set by the external resistor. On the
other hand if the RG inputs remain high impedance then a
pulse on RG/DIG- will cause an internal resistor to decrement
in value, while a pulse on RG/DIG+ will cause the internal
resistor to increment in value. Default is half scale.
The LNDINA333C is an AC only instrumentation amplifier
which has a 5Hz 3dB high pass response. Integrators are
connected between the output and feedback nodes to form a
high pass response as shown in the block diagram below.
The LNDINA333A/B/C features 8kV HBM ESD protection
compared to 4kV with the INA333. The inputs are also RFI
filtered to reduce EMI susceptibility.
The LNDINA333A/B/C is available in a EPAD DFN-8 package
which has a 65°C/W thermal resistance.
FEATURES
Fully differential AC Only (LND
Instrumentation Amplifier
Single ended (LNDINA333A)
Fully differential (LNDINA333B)
Fully differential AC only (LNDINA333C)
+2.7V to +5.5V input range
25μA typ current consumption (INA333, 50μA)
35μA typ current (LNDINA333C)
350kHz typical bandwidth
25μV typical input offset voltage
100dB typical CMRR
100nV/√Hz typical input referred noise
RFI Filtered Inputs
External resistor or programmable gain
Minimum gain setting 100V/V
Input range: GND-0.1V to VDD+0.1V
Output range: GND+0.05V to VDD-0.05V
Low drift: 2μV/°C typical
+/-5pA typical input bias current
10mA short circuit current
8kV ESD Protection (vs. 4kV for INA333)
Temperature range: -40°C to 125°C
Footprint compatible with EPAD DFN-8
APPLICATIONS
Portable heart rate equipment
Portable fitness & wellness products
Non-critical diagnostics
Vibration measurement equipment
Instrumentation
Bridge amplifiers
Pressure sensors
Weigh scales
Sensor amplifiers
BLOCK DIAGRAM
RG/DIG+
INP
INM
GND
RG/DIG-
VDD
VOUT/VOP
REF/VOM
Figure 1
– LNDINA333C Equivalent Block Diagram
Linear Dimensions Semiconductor Inc.
22620 Ricardo Rd, Cupertino CA 95014 USA
tel 312.321.1810
fax 312.321.1830
EPAD
PACKAGE
RG/DIG+
INM
INP
GND
RG/DIG-
VDD
VOUT/VOP
REF/VOM
EPAD
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
