LTC2401 Linear Technology, LTC2401 Datasheet

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LTC2401

Manufacturer Part Number
LTC2401
Description
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10
Manufacturer
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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LTC2401 Summary of contents

Page 1

... This eliminates the latency found in conven- tional converters and simplifies multiplexed applica- 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 ...

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

... – 800 A (Note 10 1.6mA (Note 10) O The denotes specifications which apply over the full operating temperature range, CONDITIONS (Note 12 (Note 12) CC LTC2401/LTC2402 MIN TYP MAX UNITS – 0.125 • V 1.125 • V REF REF 0 SET – ...

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 Frequency ISCK D Internal SCK Duty Cycle ISCK f External SCK Frequency Range ...

Page 5

... REF absolute maximum rating of – 0. sions are performed alternately between CH0 and CH1 for the LTC2402. Pin Connect (NC) on the LTC2401. ZS (Pin 5): Zero-Scale Set Input. This pin defines the SET zero-scale input value. When V ...

Page 6

... 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 next 24 bits are the conversion result, MSB first. ...

Page 7

... R as shown in Figure 2. The voltage drop across these parasitic resistors leads to systematic offset and full-scale errors. In order to eliminate the errors associated with these parasitic resistors, the LTC2401/LTC2402 include a full- scale set input (FS ( shown in Figure 3, the FS SET ...

Page 8

... and V . The wide dynamic input SET SET IN range (– 300mV to 5.3V) and low noise (0.6ppm RMS) enable the LTC2401 or the LTC2402 to directly digitize the output of the bridge sensor ...

Page 9

... LTC2402. Direct Connection to a Full Bridge The LTC2402 interfaces directly 6-wire bridge, as shown in Figure 7. Like the LTC2401, the LTC2402 in- cludes a FS voltage directly across the bridge. This eliminates errors due to excitation currents flowing through parasitic resis- tors ...

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 overall common mode and differential rejection is much better than the 80dB rejection typically found in other differential input delta-sigma converters ...

Page 11

... TANT 2 ST2 V A CC2 B LTC1535 LOGIC COMMON FLOATING COMMON 2 BARRIER T1 = COILTRONICS CTX02-14659 OR SIEMENS B78304-A1477-A3 LTC2401/LTC2402 pull-down to until the LT1761’s CC1 10V TANT 10 F CERAMIC 2 LTC2402 SCK FS SET SDO CH1 CS CH0 GND ...

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 OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ...

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