LTC2433-1
Differential Input
16-Bit No Latency
∆Σ
ADC
FEATURES
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DESCRIPTIO
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16-Bit Differential ADC in a Tiny MSOP
Low Supply Current: 200µA, 4µA in Autosleep
Rail-to-Rail Differential Input/Reference
0.12LSB INL, No Missing Codes
0.16LSB Full-Scale Error and 5
µ
V Offset
1.45
µ
V RMS Noise, Independent of V
REF
Very Low Transition Noise: <0.02LSB
Operates with a Reference as Low as 100mV with
16-Bit Resolution
Internal Oscillator—No External Components
Required
87dB Min, Simultaneous 50Hz and 60Hz Notch Filter
Single Supply 2.7V to 5.5V Operation
Pin Compatible with the 20/24-Bit LTC2431/LTC2411
Available in 10-Lead MSOP Package
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.
APPLICATIO S
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Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
TYPICAL APPLICATIO
5V REF
1µF
4.9k
(100mV)
100Ω
1
2
4
V
CC
+
Minimum Resolvable Signal vs V
REF
90
MINIMUM RESOLVABLE SIGNAL (µV)*
80
70
60
50
40
30
20
10
0
0
5
4
3
2
V
REF
(V)
24331 TA02
*FOR V
REF
≥
0.5V THE RESOLUTION
IS LIMITED BY STEP SIZE
1
24331fa
F
O
10
REF
IN
+
LTC2433-1
IN
–
REF
–
GND
SCK
SDO
CS
9
8
7
24331 TA01
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
5
3
6
3-WIRE
SPI INTERFACE
U
U
U
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
