AS1545_1 AMSCO [austriamicrosystems AG], AS1545_1 Datasheet

AS1545_1

Manufacturer Part Number

AS1545_1

Description

Dual, 12-Bit, 1MSPS, SAR ADC

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1545_1.pdf (34 pages)

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Da t a s h eet

A S 1 5 4 5

D u a l , 1 2 - B i t , 1 M S P S , S A R A D C

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

www.austriamicrosystems.com

AIN 1

BIN 3

AIN 0

BIN 0

BIN 1

BIN 2

BIN 4

BIN 5

AIN 2

AIN 3

AIN 4

AIN 5

AGND

REF_SELECT

MUX

REF

AGND

BUF

T/H

BUF

T/H

Revision 1.01

REFA

REFB

System Control

SAR and A/D

Control Logic

Conversion

Registers

2 Key Features

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.

Control

12-Bit

and

AVDD

- 12-Channel Single-Ended

- 6-Channel Pseudo-Differential

- 6-Channel Fully Differential

- 15mW max. at 1MSPS with 2.7V supplies

- 37mW max. at 1MSPS with 5.25V supplies

Sampling Rate: 1MSPS per ADC

Dual 12-bit serial interface

Software Configurable Analog Input Types:

Internal +2.5V Reference or External: 1V to V

Rail to Rail Common Mode Input Range

Low-Power Consumption

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

DGND

AS1545

DVDD

Registers

System

Control

OutPut

Drivers

OutPut

Drivers

DGND

DOUTA

SCLK

CSN

SGL/DIFF

RANGE

DOUTB

VDRIVE

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Related parts for AS1545_1

AS1545_1 Summary of contents

AS1545 Datasheet Contents 1 General Description ................................................................................................................................................ 1 2 Key Features ........................................................................................................................................................... 1 3 Applications ............................................................................................................................................................. 1 4 Pinout ...................................................................................................................................................................... 3 Pin Assignment .................................................................................................................................................... 3 Pin Description .................................................................................................................................................... 3 5 Absolute Maximum Ratings .................................................................................................................................... 5 6 Electrical Characteristics ......................................................................................................................................... 6 ...

Page 3

AS1545 Datasheet - Pinout Pin Assignment Figure 2. Pin Assignments (Top View) DGND REF_SELECT AVDD REFA AGND AGND AIN 0 AIN 1 Pin Description Table 1. Pin Description Pin Number Pin Name 1, ...

Page 4

AS1545 Datasheet - Table 1. Pin Description Pin Number Pin Name BIN0 to BIN5 21 RANGE 22 SGL/DIFF CSN 27 SCLK 28 ...

Page 5

AS1545 Datasheet - Absolute Maximum Ratings Stresses beyond those listed in Table 2 and functional operation of ...

Page 6

AS1545 Datasheet - Electrical Characteristics 2.7V to 5.25V ...

Page 7

AS1545 Datasheet - Table 3. Electrical Characteristics (Continued) Symbol Parameter Twos Complement Output Coding Positive ...

Page 8

AS1545 Datasheet - Table 3. Electrical Characteristics (Continued) Symbol Parameter Floating State Leakage Current Floating ...

Page 9

AS1545 Datasheet - Timing Characteristics 2.7V to 5.25V ...

Page 10

AS1545 Datasheet - Typical Operating Characteristics V = 5.25V, ...

Page 11

AS1545 Datasheet - Figure 10. Supply Current vs. Sampling Rate; ...

Page 12

AS1545 Datasheet - Figure 16. Part. Power-Down vs. Temperature; 500 ...

Page 13

AS1545 Datasheet - Figure 22. ENOB vs. ReferenceVoltage; 12 11.8 ...

Page 14

AS1545 Datasheet - Figure 28. SNR vs. Input Frequency, Single-Ended; ...

Page 15

AS1545 Datasheet - Terminology Acquisition Time The Acquisition time is the time needed by the ADC to accurately acquire the analog input voltage in the internal sampling capacitor. During ...

Page 16

AS1545 Datasheet - Zero Code Error The Zero Code Error is the deviation of the midscale transition (all 0xFFFh to all 0x000h in 2’s complement output coding) from the ideal ...

Page 17

AS1545 Datasheet - Total Harmonic Distortion (THD) The Total Harmonic Distortion is the ratio between the RMS value of the fundamental (input signal) to the RMS value of the first ...

Page 18

AS1545 Datasheet - Detailed Description The AS1545 is a dual, 6-channel (six single-ended, three pseudo-differential or three fully-differential for each ...

Page 19

AS1545 Datasheet - Figure 34. Typical Application + 10Ω - 10Ω + 10Ω - 10Ω Analog Input Composition The equivalent circuit ...

Page 20

AS1545 Datasheet - Analog Input Modes Table 5. Address Map Address Map SGL DIFF ...

Page 21

AS1545 Datasheet - Single-Ended Mode The AS1545 consists of 12 single-ended analog input channels with range that can be programmed to ...

Page 22

AS1545 Datasheet - Figure 38. Definition of Fully Differential Input RANGE = 0 0 < VCM < VDD VIN 0 < ...

Page 23

AS1545 Datasheet - Analog-to-Digital Conversion The analog inputs of the AS1545 can be configured as single-ended pseudo-differential or fully differential via ...

Page 24

AS1545 Datasheet - Figure 42. Straight Binary Transfer Function for Single-Ended, RANGE = 0 Full Scale = V REF Full Scale ...

Page 25

AS1545 Datasheet - Application Information Operation Modes The operation mode of the AS1545 is selected by controlling ...

Page 26

AS1545 Datasheet - Figure 47. Exiting Partial Power-Down Mode The part begins to power-up CSN 1 SCLK D ...

Page 27

AS1545 Datasheet - enter partial power-down mode, the conversion process must be interrupted by bringing CSN high ...

Page 28

AS1545 Datasheet - Power vs. Throughput Rate The power consumption of the AS1545 varies with throughput rate. When ...

Page 29

AS1545 Datasheet - Figure 52. Reading Data from Both ADCs on One D CSN t CSS 1 2 ...

Page 30

AS1545 Datasheet - top of the difference calculator, the ADC also provide us with information regarding input ...

Page 31

AS1545 Datasheet - Application Hints Grounding and Layout The analog and digital supplies to the AS1545 are independent and separately pinned out to ...

Page 32

AS1545 Datasheet - Package Drawings and Markings Figure 55. 32-lead TQFN Package D ...

Page 33

AS1545 Datasheet - Ordering Information The device is available as the standard products shown in Table 9. Ordering Information Ordering ...

Page 34

AS1545 Datasheet Copyrights Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright ...

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