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LTC2428CG#TR

Description
IC adc 20bit 8ch micropwr 28ssop
Categorysemiconductor    Analog mixed-signal IC   
File Size410KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC2428CG#TR Overview

IC adc 20bit 8ch micropwr 28ssop

LTC2424/LTC2428
4-/8-Channel 20-Bit
µPower
No Latency
∆Σ
TM
ADCs
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Pin Compatible 4-/8-Channel 20-Bit ADCs
8ppm INL, No Missing Codes at 20 Bits
4ppm Full-Scale Error and 0.5ppm Offset
1.2ppm Noise
Digital Filter Settles in a Single Cycle. Each
Conversion is Accurate, Even After Changing
Channels
Fast Mode: 16-Bit Noise, 12-Bit TUE at 100sps
Internal Oscillator—No External Components
Required
110dB Min, 50Hz/60Hz Notch Filter
Reference Input Voltage: 0.1V to V
CC
Live Zero—Extended Input Range Accommodates
12.5% Overrange and Underrange
Single Supply 2.7V to 5.5V Operation
Low Supply Current (200µA) and Auto Shutdown
Can Be Interchanged with 24-Bit LTC2404/LTC2408
if ZS
SET
Pin is Grounded
The LTC
®
2424/LTC2428 are 4-/8-channel 2.7V to 5.5V
micropower 20-bit A/D converters with an integrated
oscillator, 8ppm INL and 1.2ppm RMS noise. They use
delta-sigma technology and provide single cycle digital
filter settling time (no latency delay) for multiplexed
applications. The first conversion after the channel is
changed is always valid. Through a single pin the LTC2424/
LTC2428 can be configured for better than 110dB rejec-
tion at 50Hz or 60Hz
±2%,
or 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 converters accept any external reference voltage from
0.1V to V
CC
. With their extended input conversion range of
–12.5% V
REF
to 112.5% V
REF
(V
REF
= FS
SET
– ZS
SET
) the
LTC2424/LTC2428 smoothly resolve the offset and
overrange problems of preceding sensors or signal con-
ditioning circuits.
The LTC2424/LTC2428 communicate through a flexible
4-wire digital interface which 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.
APPLICATIO S
s
s
s
s
s
s
s
s
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
4-Digit DVMs
TYPICAL APPLICATIO
7
MUXOUT
9 CH0
10 CH1
11 CH2
ANALOG
INPUTS
–0.12V
REF
TO
1.12V
REF
12 CH3
4-/8-CHANNEL
13 CH4*
MUX
14 CH5*
15 CH6*
17 CH7*
5 ZS
SET
4
ADCIN
0.1V TO V
CC
3
2, 8
FS
SET
V
CC
CSADC
CSMUX
20-BIT
∆Σ
ADC
SCK
CLK
D
IN
SDO
23
20
25
19
21
24
V
CC
2.7V TO 5.5V
1µF
SERIAL DATA LINK
MICROWIRE AND
SPI COMPATABLE
ERROR (ppm)
+
MPU
LTC2424/LTC2428
GND
F
O
24248 TA01
26
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
1, 6, 16, 18, 22, 27, 28
*THESE PINS ARE NO CONNECTS ON THE LTC2404
U
Total Unadjusted Error (3V Supply)
10
8
6
4
2
0
–2
–4
–6
–8
–10
0
0.5
1.5
2.0
1.0
INPUT VOLTAGE (V)
2.5
24248 G01
U
U
V
CC
= 3V
V
REF
= 2.5V
T
A
= –55°C, –45°C, 25°C, 90°C
1
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