AS1539/AS1541
8 / 4 - C h a n n e l , 1 0 - B i t I ² C A n a l o g - t o - D i g i ta l C o n v e r t e r
D a ta S he e t
1 General Description
The AS1539/AS1541 are single-supply, low-power,
10-bit data acquisition devices featuring a serial I²C
interface and an 8-channel (AS1539) or 4-channel
(AS1541) 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 I C serial, 2-wire interface and
micropower consumption makes the AS1539 and
AS1541 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.
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2 Key Features
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Single Supply: 2.7 to 5.25V
8-Channel Multiplexer (AS1539)
4-Channel Multiplexer (AS1541)
Sampling Rate: 50kSPS
No Missing Codes
Internal Reference: 2.5V
High Speed I C Interface at 3.4MHz
<1.5µA Full Shutdown Current
TSSOP-16 or TQFN 4x4 16-pin Package
2
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
AS1539 only
CH6
CH7
COM
8-Channel
MUX
Sample/
Hold
Amp
Successive Approximation Register
Serial
Interface
SDA
SCL
A0
A1
AS1539/AS1541
CDAC
Comparator
REF
IN/OUT
Buffer
Internal
2.5V
Reference
GND
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