AS1545_1 Datasheet, PDF (1/34 Pages) ams AG – Dual, 12-Bit, 1MSPS, SAR ADC

Datasheet
AS1545
Dual, 12-Bit, 1MSPS, SAR ADC
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.
Figure 1. AS1545 - Block Diagram
2 Key Features
! 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 VDD
! 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
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.
REF_SELECT
REFA
AVDD
DVDD
AIN 0
AIN 1
AIN 2
AIN 3
AIN 4
AIN 5
BIN 0
BIN 1
BIN 2
BIN 3
BIN 4
BIN 5
REF
BUF
MUX
T/H
MUX
T/H
BUF
12-Bit
SAR and A/D
Conversion
Control
Control Logic
and
System Control
Registers
12-Bit
SAR and A/D
Conversion
Control
System
Control
Registers
OutPut
Drivers
OutPut
Drivers
DOUTA
SCLK
CSN
RANGE
SGL/DIFF
A0
A1
A2
VDRIVE
DOUTB
AS1545
AGND AGND AGND REFB
DGND
DGND
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