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LTC2418 Datasheet

  • LTC2418

  • 2-Channel Differential Input 24-Bit No Latency DS ADC

  • 409.52KB

  • 36頁(yè)

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LTC2412
2-Channel Differential Input
24-Bit No Latency
鈭單?/div>
ADC
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
2-Channel Differential Input with Automatic
Channel Selection (Ping-Pong)
Low Supply Current: 200碌A(chǔ), 4碌A(chǔ) in Autosleep
Differential Input and Differential Reference with
GND to V
CC
Common Mode Range
2ppm INL, No Missing Codes
2.5ppm Full-Scale Error and 0.1ppm Offset
0.16ppm Noise, 22.5 Effective Number of Bits
No Latency: Digital Filter Settles in a Single Cycle and
Each Channel Conversion is Accurate
Internal Oscillator鈥擭o External Components
Required
110dB Min, 50Hz or 60Hz Notch Filter
Narrow SSOP-16 Package
Single Supply 2.7V to 5.5V Operation
The LTC
廬
2412 is a 2-channel differential input micropower
24-bit No Latency
鈭單?/div>
TM
analog-to-digital converter with
an integrated oscillator. It provides 2ppm INL and 0.16ppm
RMS noise over the entire supply range. The two differen-
tial channels are converted alternately with channel ID
included in the conversion results. It uses delta-sigma
technology and provides single conversion settling of the
digital filter. Through a single pin, the LTC2412 can be
configured for better than 110dB input 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 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 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
. The DC
common mode input rejection is better than 140dB.
The LTC2412 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.
APPLICATIO S
s
s
s
s
s
s
s
s
s
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
6-Digit DVMs
TYPICAL APPLICATIO
2.7V TO 5.5V
1碌F
1
2
4
V
CC
1.5
V
CC
F
O
14
REF
+
CH0
+
LTC2412
CH0
鈥?/div>
REF
鈥?/div>
CH1
+
CH1
鈥?/div>
GND
2412 TA01
TUE (ppm OF V
REF
)
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
1.0
0.5
0
V
CC
= 5V
REF
+
= 5V
REF
鈥?/div>
= GND
V
REF
= 5V
V
INCM
= 2.5V
F
O
= GND
T
A
= 90擄C
T
A
= 25擄C
T
A
= 鈥?5擄C
5
THERMOCOUPLE
3
6
7
8, 9, 10, 15, 16
SCK
SDO
CS
13
12
11
3-WIRE
SPI INTERFACE
鈥?.5
鈥?.0
鈥?.5
鈥?.5 鈥? 鈥?.5 鈥? 鈥?.5 0 0.5
V
IN
(V)
U
Total Unadjusted Error vs Input
1 1.5
2
2.5
2412f
2412 TA02
U
U
1

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