LTC2433-1
1
24331fa
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.
■
Direct Sensor Digitizer
■
Weight Scales
■
Direct Temperature Measurement
■
Gas Analyzers
■
Strain-Gage Transducers
■
Instrumentation
■
Data Acquisition
■
Industrial Process Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
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
Differential Input
16-Bit No Latency ∆Σ ADC
No Latency ∆Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
Minimum Resolvable Signal vs V
REF
V
CC
REF
+
F
O
IN
+
IN
–
SCK
REF
–
SDO
GND
CS
110
4
9
3
5
6
8
7
24331 TA01
2
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
3-WIRE
SPI INTERFACE
1µF
(100mV)
4.9k
100Ω
5V REF
LTC2433-1
V
REF
(V)
0
*FOR V
REF
≥ 0.5V THE RESOLUTION
IS LIMITED BY STEP SIZE
0
MINIMUM RESOLVABLE SIGNAL (µV)*
10
30
40
50
2
4
5
90
24331 TA02
20
13
60
70
80
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
