LTC2402I LINER [Linear Technology], LTC2402I Datasheet

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LTC2402I

Manufacturer Part Number
LTC2402I
Description
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
24-Bit ADC in Tiny MSOP-10 Package
1- or 2-Channel Inputs
Automatic Channel Selection (Ping-Pong) (LTC2402)
Zero Scale and Full Scale Set for Reference
and Ground Sensing
4ppm INL, No Missing Codes
4ppm Full-Scale Error
0.5ppm Offset
0.6ppm Noise
Internal Oscillator—No External Components Required
110dB Min, 50Hz/60Hz Notch Filter
Single Conversion Settling Time for
Multiplexed Applications
Reference Input Voltage: 0.1V to V
Live Zero—Extended Input Range Accommodates
12.5% Overrange and Underrange
Single Supply 2.7V to 5.5V Operation
Low Supply Current (200 A) and Auto Shutdown
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
–0.12V
(V
REF
REFERENCE VOLTAGE
0V TO FS
ZS
= FS
REF
SET
INPUT RANGE
TO 1.12V
SET
+ 0.1V TO V
SET
ANALOG
– ZS
– 100mV
SET
1 F
REF
2.7V TO 5.5V
)
CC
U
1
2
3
4
5
V
FS
CH1
ZS
CH0
CC
SET
SET
LTC2402
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SDO
GND
SCK
CS
F
O
10
9
8
7
6
U
CC
3-WIRE
SPI INTERFACE
V
CC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
No Latency
24012 TA01
1-/2-Channel 24-Bit Power
DESCRIPTIO
The LTC
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 technol-
ogy and a new digital filter architecture that settles in a
single cycle. This eliminates the latency found in conven-
tional
tions.
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
range of –12.5% V
ZS
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
No Latency
MICROWIRE is a trademark of National Semiconductor Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
SET
), the LTC2401/LTC2402 smoothly resolve the off-
®
is a trademark of Linear Technology Corporation.
2401/LTC2402 are 1- and 2-channel 2.7V to
converters and simplifies multiplexed applica-
TM
protocols.
CC
Pseudo Differential Bridge Digitizer
TM
. With an extended input conversion
U
REF
ADC in MSOP-10
1
2
4
3
5
Final Electrical Specifications
to 112.5% V
V
FS
CH0
ZS
CH1
LTC2401/LTC2402
CC
SET
SET
LTC2402
GND
6
SDO
SCK
CS
F
O
9
8
7
10
2.7V TO 5.5V
REF
3-WIRE
SPI INTERFACE
January 2000
INTERNAL OSCILLATOR
60Hz REJECTION
(V
REF
= FS
24012TA02
SET
1

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LTC2402I Summary of contents

Page 1

FEATURES 24-Bit ADC in Tiny MSOP-10 Package 1- or 2-Channel Inputs Automatic Channel Selection (Ping-Pong) (LTC2402) Zero Scale and Full Scale Set for Reference and Ground Sensing 4ppm INL, No Missing Codes 4ppm Full-Scale Error 0.5ppm Offset 0.6ppm Noise Internal ...

Page 2

... Power Supply Rejection, 60Hz 2% FS SET Power Supply Rejection, 50Hz 2% FS SET 2 U RATINGS (Notes 1, 2) Operating Temperature Range + 0.3V) LTC2401/LTC2402C ................................ LTC2401/LTC2402I ............................ – 0.3V 0.3V) Storage Temperature Range ................. – 150 C CC Lead Temperature (Soldering, 10 sec).................. 300 C + 0.3V LTC2401CMS V 1 ...

Page 3

ALOG I PUT A D REFERE CE temperature range, otherwise specifications are at T SYMBOL PARAMETER V Input Voltage Range IN FS Full-Scale Set Range SET ZS Zero-Scale Set Range SET C Input Sampling Capacitance S(IN) ...

Page 4

LTC2401/LTC2402 CHARACTERISTICS range, otherwise specifications are at T SYMBOL PARAMETER f External Oscillator Frequency Range EOSC t External Oscillator High Period HEO t External Oscillator Low Period LEO t Conversion Time CONV f Internal SCK ...

Page 5

PIN FUNCTIONS V (Pin 1): Positive Supply Voltage. Bypass to GND CC (Pin 4) with tantalum capacitor in parallel with 0.1 F ceramic capacitor as close to the part as possible. FS (Pin 2): ...

Page 6

LTC2401/LTC2402 U U APPLICATIO S I FOR ATIO Output Data Format The LTC2401/LTC2402 serial output data stream is 32 bits long. The first 4 bits represent status information indicat- ing the sign, selected channel, input range and conversion state. The ...

Page 7

U U APPLICATIO S I FOR ATIO falling edge of SCK. The final data bit (Bit 0) is shifted out on the falling edge of the 31st SCK and may be latched on the rising edge of the 32nd SCK ...

Page 8

LTC2401/LTC2402 U U APPLICATIO S I FOR ATIO removed by the FS input to the ADC. The absolute full- SET scale output of the ADC (data out = FFFFFF see Figure 4. Similarly, ...

Page 9

U U APPLICATIO S I FOR ATIO is alternated. Embedded within the serial data output is a status bit indicating which channel corresponds to the conversion result. If the conversion was performed on CH0, this bit (Bit 30) is LOW ...

Page 10

LTC2401/LTC2402 U U APPLICATIO S I FOR ATIO The LTC2402’s single ended rejection of line frequencies ( 2%) and harmonics is better than 110dB. Since the device performs two independent single ended conver- sions each with > 110dB rejection, the ...

Page 11

U U APPLICATIO S I FOR ATIO for the forward and return paths (R1 = R2), the auxiliary channel on the LTC2402 can measure this drop. These errors are then removed with simple digital correction. The result of the first ...

Page 12

LTC2401/LTC2402 U W PACKAGE I FOR ATIO 0.007 (0.18) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH ...

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