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LTC2430 Datasheet

  • LTC2430

  • 20-Bit No Latency Delta-Sigma ADCs with Differential Input a...

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LTC2430/LTC2431
20-Bit No Latency
鈭單?/div>
TM
ADCs
with Differential Input and
Differential Reference
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Low Supply Current (200碌A in Conversion Mode
and 4碌A in Autosleep Mode)
Differential Input and Differential Reference
with GND to V
CC
Common Mode Range
3ppm INL, No Missing Codes
10ppm Full-Scale Error and 1ppm Offset
0.56ppm Noise, 20.8 ENOBs
No Latency: Digital Filter Settles in a Single Cycle.
Each Conversion Is Accurate, Even After an
Input Step
Single Supply 2.7V to 5.5V Operation
Internal Oscillator鈥擭o External Components
Required
110dB Min, 50Hz/60Hz Notch Filter
Pin Compatible with 24-Bit LTC2410/LTC2411
The LTC
庐
2430/LTC2431 are 2.7V to 5.5V micropower
20-bit differential
鈭單?/div>
analog-to-digital converters with an
integrated oscillator, 3ppm INL and 0.56ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2430/LTC2431 can be configured for
better than 110dB differential mode rejection at 50Hz or
60Hz
卤2%,
or they can be driven by an external oscillator
for a user-defined rejection frequency. The internal oscil-
lator requires no external frequency setting components.
The converters accept 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 鈥?0.5V
REF
to 0.5V
REF
.
The reference common mode voltage, V
REFCM
, and the
input common mode voltage, V
INCM
, may be indepen-
dently set anywhere within GND to V
CC
. The DC common
mode input rejection is better than 120dB.
The LTC2430/LTC2431 communicate through a flexible
3-wire digital interface that is compatible with SPI and
MICROWIRE
TM
protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
鈭單?/div>
is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
s
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gauge Transducers
Instrumentation
Data Acquisition
Industrial Process Control
DVMs and Meters
TYPICAL APPLICATIO S
(V
OUT
+ 0.25V) TO 20V
V
OUT
3V TO 5V
4.7碌F
6
LT1790
1
2
4
0.1碌F
V
CC
TUE (ppm OF V
REF
)
V
CC
0.1碌F
F
O
LTC2431
REF
+
SCK
REF
鈥?/div>
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
ANALOG INPUT RANGE
鈥?.5V
REF
TO 0.5V
REF
IN
+
IN
鈥?/div>
GND
SDO
CS
24301 TA01
3-WIRE
SPI INTERFACE
U
Total Unadjusted Error
(V
CC
= 5V, V
REF
= 5V)
5
V
CC
= 5V
4 V
REF
= 5V
V
INCM
= V
INCM
= 2.5V
3 F = GND
O
2
1
0
鈥?
鈥?
鈥?
鈥?
鈥?
鈥?.5 鈥? 鈥?.5 鈥? 鈥?0.5 0 0.5 1 1.5
INPUT VOLTAGE (V)
2
2.5
鈥?5掳C
25掳C
85掳C
24301 G01
U
U
24301f
1

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