LTC2400_15 Datasheet, PDF (1/40 Pages) Linear Technology – 24-Bit Power No Latency ADC in SO-8

LTC2400
24-Bit µPower
No Latency ∆Σ^TM ADC in SO-8
FEATURES
s _{24-Bit ADC in SO-8 Package}
s _{4ppm INL, No Missing Codes}
s _{4ppm Full-Scale Error}
s _{Single Conversion Settling Time}
for Multiplexed Applications
s _{0.5ppm Offset}
s _{0.3ppm Noise}
s _{Internal Oscillator—No External Components}
Required
s _{110dB Min, 50Hz/60Hz Notch Filter}
s _{Reference Input Voltage: 0.1V to VCC}
s _{Live Zero—Extended Input Range Accommodates}
12.5% Overrange and Underrange
s _{Single Supply 2.7V to 5.5V Operation}
s _{Low Supply Current (200µA) and Auto Shutdown}
U
APPLICATIO S
s _{Weight Scales}
s _{Direct Temperature Measurement}
s _{Gas Analyzers}
s _{Strain-Gage Transducers}
s _{Instrumentation}
s _{Data Acquisition}
s _{Industrial Process Control}
s _{6-Digit DVMs}
DESCRIPTIO
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 ±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.
The converter accepts any external reference voltage from
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.
The LTC2400 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 ∆Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
2.7V TO 5.5V
1µF
V_CC
F_O
REFERENCE
VOLTAGE
0.1V TO V_CC
ANALOG
INPUT RANGE
–0.12V_REF TO 1.12V_REF
LTC2400
V_REF
SCK
V_IN
SDO
GND
CS
V_CC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
2400 TA01
Total Unadjusted Error vs Output Code
10
8
V_CC = 5V
V_REF = 5V
6 ^{TA = 25°C}
F_O = LOW
4
2
0
–2
–4
–6
–8
–10
0
8,338,608
OUTPUT CODE (DECIMAL)
16,777,215
2400 TA02
1