LTC2433-1_15 Datasheet, PDF (1/28 Pages) Linear Technology – Differential Input 16-Bit No Latency ADC

LTC2433-1
Differential Input
16-Bit No Latency ∆Σ ADC
FEATURES
s _{16-Bit Differential ADC in a Tiny MSOP}
s _{Low Supply Current: 200µA, 4µA in Autosleep}
s _{Rail-to-Rail Differential Input/Reference}
s _{0.12LSB INL, No Missing Codes}
s _{0.16LSB Full-Scale Error and 5µV Offset}
s _{1.45µV RMS Noise, Independent of VREF}
s _{Very Low Transition Noise: <0.02LSB}
s _{Operates with a Reference as Low as 100mV with}
16-Bit Resolution
s _{Internal Oscillator—No External Components}
Required
s _{87dB Min, Simultaneous 50Hz and 60Hz Notch Filter}
s _{Single Supply 2.7V to 5.5V Operation}
s _{Pin Compatible with the 20/24-Bit LTC2431/LTC2411}
s _{Available in 10-Lead MSOP Package}
U
APPLICATIO S
s _{Direct Sensor Digitizer}
s _{Weight Scales}
s _{Direct Temperature Measurement}
s _{Gas Analyzers}
s _{Strain-Gage Transducers}
s _{Instrumentation}
s _{Data Acquisition}
s _{Industrial Process Control}
DESCRIPTIO
The LTC^®2433-1 is a differential input micropower 16-bit
No Latency ∆Σ^TM analog-to-digital converter with an inte-
grated oscillator. It provides 0.12LSB INL and 1.45µV
RMS noise independent of V_REF. It uses delta-sigma
technology and provides single conversion settling of the
digital filter. Through a single pin, the LTC2433-1 can be
configured for better than 87dB input differential mode
rejection at 50Hz and 60Hz ±2%, or it can be driven by an
external oscillator for a user defined rejection frequency.
The internal oscillator requires no external frequency
setting components.
The converter accepts any external differential reference
voltage from 0.1V to V_CC for flexible ratiometric and
remote sensing measurement configurations. The full-
scale differential input range is from – 0.5 •␣ V_REF to 0.5 •
V_REF. The reference common mode voltage, V_REFCM, and
the input common mode voltage, V_INCM, may be indepen-
dently set anywhere between GND and V_CC. The DC
common mode input rejection is better than 140dB.
The LTC2433-1 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRE^TM protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
5V REF
1µF
4.9k
(100mV)
100Ω
1
V_CC
2 _REF+
4 _IN+
10
F_O
LTC2433-1
5 _IN–
9
SCK
3 _REF–
SDO ⁸
6
GND
CS ⁷
24331 TA01
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
3-WIRE
SPI INTERFACE
Minimum Resolvable Signal vs V_REF
90
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
V_REF (V)
24331 TA02
*FOR V_REF ≥ 0.5V THE RESOLUTION
IS LIMITED BY STEP SIZE
24331fa
1