LTC2411/LTC2411-1
1
The LTC
2411/LTC2411-1 are 2.7V to 5.5V micropower
24-bit differential
Σ analog-to-digital converters with an
integrated oscillator, 2ppm INL and 0.29ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2411 can be configured for better than
110dB differential mode rejection at 50Hz or 60Hz
±2%,
and the LTC2411-1 can provide better than 87dB input
differential mode rejection over the range of 49Hz to
61.2Hz, or they can be driven by an external oscillator for
a user-defined rejection frequency. The LTC2411 and
LTC2411-1 are identical when driven by an external
oscillator. The internal oscillator requires no external
frequency setting components.
The converters accept any external differential reference
voltage from 0.1V to VCC for flexible ratiometric and
remote sensing measurement configurations. The full-
scale differential input range is from – 0.5VREF to 0.5VREF.
The reference common mode voltage, VREFCM, and the
input common mode voltage, VINCM, may be indepen-
dently set anywhere within the GND to VCC range of the
LTC2411/LTC2411-1. The DC common mode input rejec-
tion is better than 140dB.
The LTC2411/LTC2411-1 communicate through a flexible
3-wire digital interface that is compatible with SPI and
MICROWIRE
TM protocols.
s
Direct Sensor Digitizer
s
Weight Scales
s
Direct Temperature Measurement
s
Gas Analyzers
s
Strain Gauge Transducers
s
Instrumentation
s
Data Acquisition
s
Industrial Process Control
s
6-Digit DVMs
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
24-Bit ADC in an MS10 Package
s
Low Supply Current (200
A in Conversion Mode
and 4
A in Autosleep Mode)
s
Differential Input and Differential Reference
with GND to VCC Common Mode Range
s
2ppm INL, No Missing Codes
s
4ppm Full-Scale Error and 1ppm Offset
s
0.29ppm Noise
s
No Latency: Digital Filter Settles in a Single Cycle.
Each Conversion Is Accurate, Even After an
Input Step
s
Single Supply 2.7V to 5.5V Operation
s
Internal Oscillator—No External Components
Required
s
110dB Min, Pin Selectable 50Hz/60Hz Notch Filter
(LTC2411)
s
Simultaneous 50Hz/60Hz Rejection (LTC2411-1)
24-Bit No Latency
ΣTM ADC
with Differential Input and
Reference in MSOP
No Latency
Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
VCC
FO
REF+
REF
SCK
IN+
IN
SDO
GND
CS
110
2
3
9
4
5
8
6
7
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
= INTERNAL OSC/50Hz REJECTION (LTC2411)
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION (LTC2411)
= SIMULTANEOUS 50Hz/60Hz REJECTION (LTC2411-1)
3-WIRE
SPI INTERFACE
1
F
2.7V TO 5.5V
LTC2411/
LTC2411-1
2411 TA01
VCC
LTC2411/
LTC2411-1
IN+
REF+ VCC
REF
VCC
GND
FO
IN
1
F
SCK
3-WIRE
SPI
INTERFACE
SDO
2411 TA02
CS
9
2
1
610
4
5
3
8
7
BRIDGE
IMPEDANCE
100
TO 10k
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