ltc2428 Linear Technology Corporation, ltc2428 Datasheet
ltc2428
Manufacturer Part Number
ltc2428
Description
4-/8-channel 20-bit ?power No Latency Delta-sigma Adc
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC2428.pdf
(36 pages)
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Part Number:
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
–0.12V
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
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
Can Be Interchanged with 24-Bit LTC2404/LTC2408
if ZS
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
4-Digit DVMs
1.12V
ANALOG
INPUTS
REF
REF
TO
SET
*THESE PINS ARE NO CONNECTS ON THE LTC2404
10
11
12
13
14
15
17
9
5 ZS
Pin is Grounded
CH0
CH1
CH2
CH3
CH4*
CH5*
CH6*
CH7*
SET
4-/8-CHANNEL
U
MUX
MUXOUT
1, 6, 16, 18, 22, 27, 28
7
4
ADCIN
+
LTC2424/LTC2428
0.1V TO V
–
U
20-BIT
GND
ADC
3
FS
CC
SET
CC
V
CC
2, 8
CSMUX
CSADC
24248 TA01
SDO
SCK
CLK
D
IN
F
O
23
20
25
19
21
24
26
V
1 F
CC
SERIAL DATA LINK
SPI COMPATABLE
MICROWIRE AND
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
2.7V TO 5.5V
MPU
4-/8-Channel 20-Bit Power
DESCRIPTIO
The LTC
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
–12.5% V
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
No Latency
MICROWIRE is a trademark of National Semiconductor Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
®
CC
is a trademark of Linear Technology Corporation.
2424/LTC2428 are 4-/8-channel 2.7V to 5.5V
REF
. With their extended input conversion range of
TM
to 112.5% V
protocols.
U
LTC2424/LTC2428
Total Unadjusted Error (3V Supply)
–10
10
–2
–4
–6
–8
REF
8
6
4
2
0
0
V
V
CC
REF
(V
= 3V
= 2.5V
0.5
REF
T
INPUT VOLTAGE (V)
A
= –55 C, –45 C, 25 C, 90 C
= FS
1.0
TM
SET
1.5
– ZS
ADCs
2.0
24248 G01
SET
2.5
) the
1
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