鈭單?/div>
analog-to-digital converter with an inte-
grated oscillator, 4ppm INL and 0.29ppm RMS noise. It
uses delta-sigma technology and provides 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
鹵2%,
or it can be driven by an external oscillator for a user
defined rejection frequency. The internal oscillator re-
quires 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 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 the GND to V
CC
range of the
LTC2411. The DC common mode input rejection is better
than 140dB.
The LTC2411 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
鈭單?/div>
is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
s
s
s
s
s
s
s
s
24-Bit ADC in an MS10 Package
Low Supply Current (200碌A(chǔ) in Conversion Mode
and 4碌A(chǔ) in Autosleep Mode)
Differential Input and Differential Reference
with GND to V
CC
Common Mode Range
2ppm INL, No Missing Codes
4ppm Full-Scale Error and 1ppm Offset
0.29ppm Noise
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
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
6-Digit DVMs
TYPICAL APPLICATIO
2.7V TO 5.5V
1碌F
1
V
CC
LTC2411
REFERENCE
VOLTAGE
0.1V TO V
CC
ANALOG INPUT RANGE
鈥?.5V
REF
TO 0.5V
REF
2
3
4
5
6
REF
+
REF
鈥?/div>
IN
+
V
CC
F
O
10
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
SCK
9
3-WIRE
SPI INTERFACE
BRIDGE
IMPEDANCE
100鈩?TO 10k鈩?/div>
SDO
CS
8
7
2411 TA01
IN
鈥?/div>
GND
U
U
U
V
CC
1碌F
2
4
5
1
REF
+
V
CC
鈥?/div>
9 SDO
8 SCK
7 CS
3-WIRE
SPI
INTERFACE
IN
+
IN
3
LTC2411
F
O
10
REF
next
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