AS1545
Dual, 12-Bit, 1MSPS, SAR ADC
D a ta S he e t
1 General Description
The AS1545 is a dual, 12-bit, 6-channel, 1 MSPS, high
speed, successive approximation (SAR) analog-to-
digital converters (ADCs). The AS1545 is designed to
operate with a single +2.7V to +5.25V supply and a
sampling rate of up to 1 MSPS.
The device contains two ADCs, each preceded by a 6-
channel multiplexer and a high-bandwidth track/hold
amplifier. Data access is made via standard control
inputs in support of wide range of microprocessors and
DSPs.
The device requires very low supply-current at the
1MSPS maximum sampling speed, and features flexible
power-down modes to reduce power consumption at
slower throughput rate.
The AS1545 contains an internal 2.5V reference and
integrated reference buffer that can be over driven when
an external reference is required.
Superior AC characteristics, low power consumption,
and highly reliable packaging makes the AS1545 perfect
for portable battery-powered remote sensors and data-
acquisition devices.
The AS1545 is available in a 32-lead TQFN package.
2 Key Features
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Sampling Rate: 1MSPS per ADC
Dual 12-bit serial interface
Software Configurable Analog Input Types:
- 12-Channel Single-Ended
- 6-Channel Pseudo-Differential
- 6-Channel Fully Differential
Internal +2.5V Reference or External: 1V to V
DD
Rail to Rail Common Mode Input Range
Low-Power Consumption
- 15mW max. at 1MSPS with 2.7V supplies
- 37mW max. at 1MSPS with 5.25V supplies
Dual conversion with read at 20 MHz SCLK
Single-Supply Operation: +2.7V to +5.25V
Motor Control Registers: Difference of Inputs,
Quadrature Signal Phases, Direction and Step
Down Counter
32-lead TQFN Package
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3 Applications
The device is ideal for motor control like encoder feed-
back or current sense, motion control such as robotics,
sonar, or for any other radio frequency identification.
Figure 1. Block Diagram
REF_SELECT
REF
AIN 0
AIN 1
AIN 2
AIN 3
AIN 4
AIN 5
MUX
T/H
BUF
REFA
AVDD
DVDD
System
Control
Registers
12-Bit
SAR and A/D
Conversion
Control
OutPut
Drivers
DOUTA
SCLK
CSN
RANGE
SGL/DIFF
A0
A1
A2
VDRIVE
Control Logic
and
System Control
Registers
BIN 0
BIN 1
BIN 2
BIN 3
BIN 4
BIN 5
BUF
AGND
AGND
AGND
REFB
DGND
DGND
MUX
T/H
12-Bit
SAR and A/D
Conversion
Control
OutPut
Drivers
DOUTB
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