AS1534 Datasheet, PDF (1/2 Pages) ams AG – 12-bit, 8-Channel, Low-Power, 200ksps A/D Converter

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AS1534
Product Brief
12-bit, 8-Channel, Low-Power, 200ksps A/D Converter
1 General Description
The AS1534 is a low-power, 8-channel, 200ksps, 12-bit
analog-to-digital (A/D) converter specifically designed to
operate with single-supply devices. Superior AC charac-
teristics, very low power-consumption, and highly-reli-
able packaging make the AS1534 perfect for battery-
powered remote-sensor and data-acquisition devices.
The successive-approximation register (SAR), high-
speed sampling, high-bandwidth track/hold circuitry, and
configurable inputs combine to make the AS1534 highly-
flexible and configurable.
Internal registers are used to control the AS1534 fea-
tures, report on the status of the device, and hold the
A/D conversion results.
The device requires very low supply-current at the
200ksps max sampling speed, and features flexible
power-down modes to reduce power consumption at
slower throughput rate.
The AS1534 operates from a single +3 to +3.6V supply
and contains an internal 2.5V reference and integrated
reference buffer. The device also supports an external
reference.
Data accesses are made via the fast 8-/16-bit parallel
interface in support of a wide range of microprocessors.
The AS1534 is available in a 44-pin PQFP package.
Figure 1. Block Diagram
2 Key Features
! Sampling Rate: 200ksps
! 8- and 16-Bit Parallel Interface
! Analog Input Types:
- 8-Channel Single-Ended
- 4-Channel Pseudo-Differential
- 4-Channel Fully-Differential
! Software-Configurable Unipolar or Bipolar Inputs
! Internal +2.5V Reference
! External Reference: 1.2V to VDD
! Low-Power Operation:
- 7.5mW (VDD = 3 V)
- 1.5mW (Using Automatic Power-Down after Con-
version; VDD = 3 V, 10ksps)
! Single-Supply Operation: +3 to +3.6V
! 44-pin PQFP Package
3 Applications
The device is ideal for remote sensors, data-acquisition
and data-logging devices, pen-digitizers, process con-
trol, or any other space-limited A/D application with low
power-consumption requirements.
8:15
AIN0:AIN7
4
AVDD
5
AGND
3
REFIN/
REFOUT
6
CREF1
7
CREF2
I/P
MUX
Track/
Hold
150kΩ
+2.5V
REF
Buffer
Charge
Redistribution
DAC
AS1534
Comp-
arator
12-Bit SAR
and A/D
Conversion
Control
Parallel Interface
Controller Register
27
DVDD
28
DGND
39
CLKIN
41
CONVSTN
40
BUSY
18
SLEEPN
29
DB8/HBEN
DB0:DB15
43 RDN 44 CSN 42 WRN 2 WBN
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Revision 1.03
1-2