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AS1542 Datasheet Preview

AS1542 Datasheet

12-Bit ADC

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AS1542
16-Channel, 1 Msps, 12-Bit ADC with Sequencer
Data Sheet
1 General Description
The AS1542 is a 12-bit high-speed, low-power, 16-chan-
nel, successive-approximation ADC that operates from
a single 2.7 to 5.25V supply. The device features high
throughput rates (1Msps) and a low-noise, wide-band-
width track-and-hold amplifier that can handle input fre-
quencies in excess of 1 MHz.
The AS1542 features 16 single-ended or 8 fully differen-
tial analog inputs with a channel sequencer to allow a
programmed selection of channels to be converted
sequentially. The conversion time is determined by the
SCLK frequency (also used as the master clock to con-
trol the conversion).
The conversion process and data acquisition are con-
trolled using a chip select pin and a serial clock signal,
allowing the device to easily interface with microproces-
sors or DSPs. The input signal is sampled on the falling
edge of CSN and conversion is also initiated at this
point. There are no pipeline delays associated with the
device.
The AS1542 uses advanced design techniques to
achieve very low power dissipation at high throughput
rates. At maximum throughput rates, the AS1542 con-
sumes just 2.8mA (@3.6V), and 3.5mA (@5.25V).
By using internal control register, single-ended or fully-
differential conversion mode with different input ranges
can be used with either straight binary or twos comple-
ment output coding.
The device is available in a TSSOP-28 pin package.
Figure 1. Typical Application
2 Key Features
! Single Supply Operation with VDRIVE Function:
2.7 to 5.25V
! Fast Throughput Rate: 1 Msps
! Sequencer & Channel Counter
! Software-Configurable Analog Input Types:
- 16-Channel Single-Ended
- 8-Channel Fully-Differential
! Software-Configurable Input Range
! Low Power Consumption at Max Throughput Rates:
- 10.1mW @ 1Msps (3.6V Supply)
- 18.4mW @ 1Msps (5.25V Supply)
! Shutdown Mode Current: 0.5µA
! Flexible Power/Serial Clock Speed Management
! Wide Input Bandwidth: 71dB SNR @ 50 kHz Input
Frequency
! No Pipeline Delays
! High Speed SPI/QSPI/Microwire/DSP Interface
! TSSOP-28 Package
3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion and data-logging devices, pen-digitizers, process
control, or any other space-limited A/D application with
low power-consumption requirements.
VDD
REFIN
VIN0:15
16
Multiplexer
Track/
Hold
AGND
GND
Sequencer
AS1542
12-Bit
ADC
Control
Logic
DGND
SCLK
DOUT
DIN
CSN
VDRIVE
www.austriamicrosystems.com
Revision 1.00
1 - 29




austriamicrosystems AG

AS1542 Datasheet Preview

AS1542 Datasheet

12-Bit ADC

No Preview Available !

AS1542
Data Sheet
1 General Description ................................................................................................................................ 1
2 Key Features .......................................................................................................................................... 1
3 Applications ............................................................................................................................................ 1
4 Pinout ..................................................................................................................................................... 3
Pin Assignments ..................................................................................................................................................... 3
Pin Descriptions ..................................................................................................................................................... 3
5 Absolute Maximum Ratings .................................................................................................................... 4
6 Electrical Characteristics ........................................................................................................................ 5
Timing Specifications .............................................................................................................................................. 8
7 Typical Operating Characteristics ........................................................................................................... 9
8 Detailed Description ............................................................................................................................. 12
Converter Operation ............................................................................................................................................. 12
Analog Input ......................................................................................................................................................... 13
Track/Hold ..................................................................................................................................................... 13
Control Register ................................................................................................................................................... 14
Analog Input Configuration ............................................................................................................................ 15
Input Channel Selection ................................................................................................................................ 15
Transfer Functions ........................................................................................................................................ 16
Two’s Complement Transfer Function ........................................................................................................... 16
Power Mode Selection .................................................................................................................................. 17
Sequencer Operation .................................................................................................................................... 17
Shadow Register .................................................................................................................................................. 18
Direct Conversion (SEQ = 0, SHADOW = 0) ................................................................................................ 18
Shadow Register Conversion (SEQ = 0, SHADOW = 1) .............................................................................. 19
Channel Counter Conversion (SEQ = 1, SHADOW = 1) ............................................................................... 20
Serial Interface ..................................................................................................................................................... 20
Power Modes ....................................................................................................................................................... 22
Normal Mode (PM1 = 1, PM0 = 1) ................................................................................................................ 22
Auto Shutdown (PM1 = 0, PM0 = X) ............................................................................................................. 23
Power vs. Throughput Rate .................................................................................................................................. 23
VDRIVE ................................................................................................................................................................ 24
External Reference ............................................................................................................................................... 24
9 Application Information ......................................................................................................................... 25
Initialisation ........................................................................................................................................................... 25
Grounding and Layout Considerations ................................................................................................................. 26
10 Package Drawings and Markings ....................................................................................................... 27
11 Ordering Information .......................................................................................................................... 28
www.austriamicrosystems.com
Revision 1.00
2 - 29


Part Number AS1542
Description 12-Bit ADC
Maker austriamicrosystems AG
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AS1542 Datasheet PDF






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