LTC2420I LINER [Linear Technology], LTC2420I Datasheet

no-image

LTC2420I

Manufacturer Part Number
LTC2420I
Description
20-Bit uPower No Latency ADC in SO-8
Manufacturer
LINER [Linear Technology]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC2420IS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC2420IS8#PBF
Manufacturer:
Linear
Quantity:
1 200
Part Number:
LTC2420IS8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
20-Bit ADC in SO-8 Package
8ppm INL, No Missing Codes at 20 Bits
4ppm Full-Scale Error
0.5ppm Offset
1.2ppm Noise
Digital Filter Settles in a Single Cycle. Each
Conversion Is Accurate, Even After an Input Step.
Internal Oscillator—No External Components
Required
Fast Mode: 16-Bit Noise, 12 Bits TUE at 100sps
110dB Min, 50Hz/60Hz Notch Filter
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
Pin Compatible with 24-Bit LTC2400
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
4-Digit DVMs
–0.12V
REF
INPUT RANGE
0.1V TO V
TO 1.12V
REFERENCE
VOLTAGE
ANALOG
1 F
2.7V TO 5.5V
REF
CC
U
1
2
3
4
V
V
V
GND
CC
REF
IN
LTC2420
SDO
SCK
CS
F
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.
O
8
7
6
5
U
CC
3-WIRE
SPI INTERFACE
V
CC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
No Latency
2420 TA01
DESCRIPTIO
The LTC
an integrated oscillator, 8ppm INL and 1.2ppm RMS
noise that operates from 2.7V to 5.5V. It uses delta-sigma
technology and provides a digital filter that settles in a
single cycle for multiplexed applications. Through a single
pin, the LTC2420 can be configured 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 800Hz. The internal oscillator requires
no external frequency setting components.
The converter accepts any external reference voltage from
0.1V to V
–12.5% V
resolves the offset and overrange problems of preceding
sensors or signal conditioning circuits.
The LTC2420 communicates through a flexible 3-wire
digital interface which 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.
®
is a trademark of Linear Technology Corporation.
2420 is a micropower 20-bit A/D converter with
CC
REF
. With its extended input conversion range of
TM
to 112.5% V
protocols.
Total Unadjusted Error vs Output Code
–10
10
–2
–4
–6
–8
8
6
4
2
0
0
U
V
V
T
F
O
CC
REF
A
= 25 C
= LOW
= 5V
Final Electrical Specifications
= 5V
OUTPUT CODE (DECIMAL)
TM
20-Bit Power
REF
ADC in SO-8
524,288
, the LTC2420 smoothly
January 2000
LTC2420
2420 TA02
1,048,575
1

Related parts for LTC2420I

LTC2420I Summary of contents

Page 1

FEATURES 20-Bit ADC in SO-8 Package 8ppm INL, No Missing Codes at 20 Bits 4ppm Full-Scale Error 0.5ppm Offset 1.2ppm Noise Digital Filter Settles in a Single Cycle. Each Conversion Is Accurate, Even After an Input Step. Internal Oscillator—No External ...

Page 2

... Reference Input Voltage to GND .. – 0. Digital Input Voltage to GND ........ – 0. Digital Output Voltage to GND ..... – 0. Operating Temperature Range LTC2420C ............................................... LTC2420I ............................................ – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C U CONVERTER CHARACTERISTICS ...

Page 3

ALOG I PUT A D REFERE CE temperature range, otherwise specifications are at T SYMBOL PARAMETER V Input Voltage Range IN V Reference Voltage Range REF C Input Sampling Capacitance S(IN) C Reference Sampling Capacitance S(REF) ...

Page 4

LTC2420 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. V (Pin 2): ...

Page 6

LTC2420 U U APPLICATIO S I FOR ATIO CS SCK SDO EOC = 1 CONVERSION Figure 1. LTC2420 Compatible Timing with the LTC2400 Bit 21 (third output bit) is the conversion result sign indi- cator (SIG >0, ...

Page 7

U U APPLICATIO S I FOR ATIO CS BIT 23 BIT 22 SDO EOC Hi-Z SCK 1 SLEEP Table 2. LTC2420 Output Data Format Bit 23 Bit 22 Input Voltage EOC DMY V > 9/8 • ...

Page 8

LTC2420 U U APPLICATIO S I FOR ATIO output data rate (ODR) and the frequency applied to the F pin (F ) is: O ODR = F /20480 O For output data rates samples/second, the total unadjusted ...

Page 9

U U APPLICATIO S I FOR ATIO As shown in Figure 8, the LTC2420 can capture transient data with 90dB of dynamic range (with a 300mV signal at 2Hz). The exceptional DC performance of the LTC2420 enables signals to be ...

Page 10

LTC2420 U U APPLICATIO S I FOR ATIO Single-Chip Instrumentation Amplifier for the LTC2420 The circuit in Figure simple solution for processing differential signals in pressure transducer, weigh scale or strain gauge applications that can operate on ...

Page 11

U U APPLICATIO S I FOR ATIO Table 3. Typical Performance of the LTC2420 ADC When Used with the LT1920 Instrumentation Amplifiers in Figure 9’s Differential Digitizing Circuit PARAMETER Differential Input Voltage Range Zero Error Maximum Input Current Nonlinearity Noise ...

Page 12

LTC2420 U W PACKAGE I FOR ATIO 0.010 – 0.020 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 (0.406 – 1.270) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER ...

Related keywords