LTC2402 Datasheet, PDF (1/32 Pages) Linear Technology – 1-/2-Channel 24-Bit mPower No Latency DSTMADCs in MSOP-10

LTC2401/LTC2402
1-/2-Channel 24-Bit µPower
No Latency ∆Σ^TMADCs in MSOP-10
FEATURES
DESCRIPTIO
s _{24-Bit ADCs in Tiny MSOP-10 Packages}
s _{4ppm INL, No Missing Codes}
s _{4ppm Full-Scale Error}
s _{0.5ppm Offset}
s _{0.6ppm Noise}
s _{Single Conversion Settling Time for}
Multiplexed Applications
s _{1- or 2-Channel Inputs}
s _{Automatic Channel Selection (Ping-Pong) (LTC2402)}
s _{Zero Scale and Full Scale Set for Reference}
and Ground Sensing
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 Gauge Transducers}
s _{Instrumentation}
s _{Data Acquisition}
s _{Industrial Process Control}
The LTC^®2401/LTC2402 are 1- and 2-channel 2.7V to 5.5V
micropower 24-bit analog-to-digital converters with an
integrated oscillator, 4ppm INL and 0.6ppm RMS noise.
These ultrasmall devices use delta-sigma technology and
a new digital filter architecture that settles in a single cycle.
This eliminates the latency found in conventional ∆Σ
converters and simplifies multiplexed applications.
Through a single pin, the LTC2401/LTC2402 can be
configured for better than 110dB rejection at 50Hz or
60Hz ±2%, or 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 fre-
quency setting components.
These converters accept an external reference voltage
from 0.1V to V_CC. With an extended input conversion
range of –12.5% V_REF to 112.5% V_REF (V_REF = FS_SET –
ZS_SET), the LTC2401/LTC2402 smoothly resolve the off-
set and overrange problems of preceding sensors or
signal conditioning circuits.
The LTC2401/LTC2402 communicate through a 2- or
3-wire digital interface that 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
REFERENCE VOLTAGE
ZS_SET + 0.1V TO V_CC
ANALOG INPUT RANGE
ZS_SET – 0.12V_REF TO
FS_SET + 0.12V_REF
(V_REF = FS_SET – ZS_SET)
0V TO FS_SET – 100mV
1
V_CC
10
F_O
LTC2402
2
FS_SET
9
SCK
3
CH1
SDO ⁸
4
CH0
7
CS
5
6
ZS_SET GND
V_CC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
24012 TA01
Pseudo Differential Bridge Digitizer
1
V_CC
2 ^LTC2402
FS_{SET SCK} 9
4
CH0
8
SDO
3
CH1
CS ⁷
2.7V TO 5.5V
3-WIRE
SPI INTERFACE
5
ZS_SET
GND
6
10
F_O
INTERNAL OSCILLATOR
60Hz REJECTION
24012TA02
1