Linear Technology LTC2400CS8, 24-Bit Delta Sigma ADC (req DC590) DC573A DC573A データシート
製品コード
DC573A
1
LTC2400
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
24-Bit
µ
Power
No Latency
∆Σ
TM
ADC in SO-8
■
Weight Scales
■
Direct Temperature Measurement
■
Gas Analyzers
■
Strain-Gage Transducers
■
Instrumentation
■
Data Acquisition
■
Industrial Process Control
■
6-Digit DVMs
Total Unadjusted Error vs Output Code
■
24-Bit ADC in SO-8 Package
■
4ppm INL, No Missing Codes
■
4ppm Full-Scale Error
■
Single Conversion Settling Time
for Multiplexed Applications
for Multiplexed Applications
■
0.5ppm Offset
■
0.3ppm Noise
■
Internal Oscillator—No External Components
Required
Required
■
110dB Min, 50Hz/60Hz Notch Filter
■
Reference Input Voltage: 0.1V to V
CC
■
Live Zero—Extended Input Range Accommodates
12.5% Overrange and Underrange
12.5% Overrange and Underrange
■
Single Supply 2.7V to 5.5V Operation
■
Low Supply Current (200
µ
A) and Auto Shutdown
The LTC
®
2400 is a 2.7V to 5.5V micropower 24-bit
converter with an integrated oscillator, 4ppm INL and
0.3ppm RMS noise. It uses delta-sigma technology and
provides single cycle settling time for multiplexed appli-
cations. Through a single pin the LTC2400 can be config-
ured for better than 110dB rejection at 50Hz or 60Hz
0.3ppm RMS noise. It uses delta-sigma technology and
provides single cycle settling time for multiplexed appli-
cations. Through a single pin the LTC2400 can be config-
ured for better than 110dB rejection at 50Hz or 60Hz
±
2%,
or it can be driven by an external oscillator for a user
defined rejection frequency in the range 1Hz to 120Hz.
The internal oscillator requires no external frequency
setting components.
defined rejection frequency in the range 1Hz to 120Hz.
The internal oscillator requires no external frequency
setting components.
The converter accepts any external reference voltage from
0.1V to V
0.1V to V
CC
. With its extended input conversion range of
–12.5% V
REF
to 112.5% V
REF
, the LTC2400 smoothly
resolves the offset and overrange problems of preceding
sensors or signal conditioning circuits.
sensors or signal conditioning circuits.
The LTC2400 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRE
digital interface which is compatible with SPI and
MICROWIRE
TM
protocols.
V
CC
F
O
V
REF
SCK
V
IN
SDO
GND
CS
REFERENCE
VOLTAGE
0.1V TO V
CC
ANALOG
INPUT RANGE
–0.12V
REF
TO 1.12V
REF
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
SPI INTERFACE
1
µ
F
2.7V TO 5.5V
LTC2400
2400 TA01
V
CC
OUTPUT CODE (DECIMAL)
0
8,338,608
16,777,215
LINEARITY ERROR (ppm)
2400 TA02
10
8
6
4
2
0
–2
–4
–6
–8
–10
V
CC
= 5V
V
REF
= 5V
T
A
= 25
°
C
F
O
= LOW
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
∆Σ
is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.