LTC2402I 반도체 회로 부품 판매점
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10
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 Linear Technology |
Final Electrical Specifications
LTC2401/LTC2402
1-/2-Channel 24-Bit µPower
No Latency ∆ΣTMADC in MSOP-10
FEATURES
DESCRIPTIO
January 2000
s 24-Bit ADC in Tiny MSOP-10 Package
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 4ppm INL, No Missing Codes
s 4ppm Full-Scale Error
s 0.5ppm Offset
s 0.6ppm Noise
s Internal Oscillator—No External Components Required
s 110dB Min, 50Hz/60Hz Notch Filter
s Single Conversion Settling Time for
Multiplexed Applications
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
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 technol-
ogy and a new digital filter architecture that settles in a
single cycle. This eliminates the latency found in conven-
tional ∆Σ 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. The internal oscillator requires no external fre-
quency setting components.
These converters accept an external reference voltage
from 0.1V to VCC. With an extended input conversion
range of –12.5% VREF to 112.5% VREF (VREF = FSSET –
ZSSET), 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
MICROWIRETM 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
ZSSET + 0.1V TO VCC
ANALOG
INPUT RANGE
–0.12VREF TO 1.12VREF
(VREF = FSSET – ZSSET)
0V TO FSSET – 100mV
1
VCC
10
FO
LTC2402
2
FSSET
9
SCK
3
CH1
SDO 8
4
CH0
7
CS
56
ZSSET GND
VCC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
24012 TA01
Pseudo Differential Bridge Digitizer
1
VCC
2 LTC2402
FSSET SCK 9
4
CH0
8
SDO
3
CH1
CS 7
2.7V TO 5.5V
3-WIRE
SPI INTERFACE
5
ZSSET
GND
6
10
FO
INTERNAL OSCILLATOR
60Hz REJECTION
24012TA02
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.
1
LTC2401/LTC2402
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltage (VCC) to GND .......................– 0.3V to 7V
Analog Input Voltage to GND ....... – 0.3V to (VCC + 0.3V)
Reference Input Voltage to GND .. – 0.3V to (VCC + 0.3V)
Digital Input Voltage to GND ........ – 0.3V to (VCC + 0.3V)
Digital Output Voltage to GND ..... – 0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2401/LTC2402C ................................ 0°C to 70°C
LTC2401/LTC2402I ............................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER INFORMATION
VCC 1
FSSET 2
VIN 3
NC 4
ZSSET 5
TOP VIEW
10 FO
9 SCK
8 SDO
7 CS
6 GND
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 130°C/W
Consult factory for Military grade parts.
ORDER PART NUMBER
LTC2401CMS
LTC2401IMS
MS10 PART MARKING
LTMB
LTMC
VCC 1
FSSET 2
CH1 3
CH0 4
ZSSET 5
TOP VIEW
10 FO
9 SCK
8 SDO
7 CS
6 GND
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 130°C/W
ORDER PART NUMBER
LTC2402CMS
LTC2402IMS
MS10 PART MARKING
LTMD
LTME
CONVERTER CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VREF = FSSET – ZSSET. (Notes 3, 4)
PARAMETER
Resolution
No Missing Codes Resolution
Integral Nonlinearity
Offset Error
Offset Error Drift
Full-Scale Error
Full-Scale Error Drift
Total Unadjusted Error
Output Noise
Normal Mode Rejection 60Hz ±2%
Normal Mode Rejection 50Hz ±2%
Power Supply Rejection, DC
Power Supply Rejection, 60Hz ±2%
Power Supply Rejection, 50Hz ±2%
CONDITIONS
0.1V ≤ FSSET ≤ VCC, ZSSET = 0V (Note 5)
FSSET = 2.5V, ZSSET = 0V (Note 6)
FSSET = 5V, ZSSET = 0V (Note 6)
2.5V ≤ FSSET ≤ VCC, ZSSET = 0V
2.5V ≤ FSSET ≤ VCC, ZSSET = 0V
2.5V ≤ FSSET ≤ VCC, ZSSET = 0V
2.5V ≤ FSSET ≤ VCC, ZSSET = 0V
FSSET = 2.5V, ZSSET = 0V
FSSET = 5V, ZSSET = 0V
VIN = 0V (Note 13)
(Note 7)
(Note 8)
FSSET = 2.5V, ZSSET = 0V, VIN = 0V
FSSET = 2.5V, ZSSET = 0V, VIN = 0V, (Note 7)
FSSET = 2.5V, ZSSET = 0V, VIN = 0V, (Note 8)
MIN TYP MAX
q 24
q 24
q 2 10
q 4 15
q 0.5 2
0.01
q 4 10
0.04
5
10
3
q 110
130
q 110
130
100
110
110
UNITS
Bits
Bits
ppm of VREF
ppm of VREF
ppm of VREF
ppm of VREF/°C
ppm of VREF
ppm of VREF/°C
ppm of VREF
ppm of VREF
µVRMS
dB
dB
dB
dB
dB
2
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관련 데이터시트
LTC2402
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10 - Linear Technology
LTC2402C
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10 - Linear Technology
LTC2402CMS
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10 - Linear Technology
LTC2402I
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10 - Linear Technology
LTC2402IMS
1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10 - Linear Technology