AS1538_1 Datasheet, PDF (1/20 Pages) ams AG – 8/4-Channel, 12-Bit I2C Analog-to-Digital Converter

AS1538/AS1540
8/4-Channel, 12-Bit I²C Analog-to-Digital Converter
Data Sheet
1 General Description
The AS1538/AS1540 are single-supply, low-power, 12-
bit data acquisition devices featuring a serial I²C inter-
face and an 8-channel (AS1538) or 4-channel (AS1540)
multiplexer.
The analog-to-digital (A/D) converters features a sam-
ple-and-hold amplifier an internal asynchronous clock
and an internal reference.
The combination of an I²C serial, 2-wire interface and
micropower consumption makes the AS1538 and
AS1540 ideal for applications requiring the A/D con-
verter to be close to the input source in remote locations
and for applications requiring isolation.
The device is available in a TSSOP-16 or TQFN 4x4 16-
pin package.
2 Key Features
! Single Supply: 2.7 to 5.25V
! 8-Channel Multiplexer (AS1538)
! 4-Channel Multiplexer (AS1540)
! Sampling Rate: 50kSPS
! No Missing Codes
! Internal Reference: 2.5V
! High Speed I²C Interface at 3.4MHz
! <1.5µA Full Shutdown Current
! TSSOP-16 or TQFN 4x4 16-pin Package
3 Applications
The device is ideal for voltage-supply monitoring, iso-
lated data acquisition, transducer interfaces, battery-
operated systems, remote data acquisition or any other
analog-to-digital conversion application.
Figure 1. Block Diagram
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
REFIN/OUT
8-Channel
MUX
Sample/
Hold
Amp
Successive Approximation Register
AS1538/AS1540
CDAC
Comparator
Serial
Interface
SDA
SCL
A0
A1
Buffer
Internal
2.5V
Reference
GND
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