AS1545

AS1545 Datasheet

AS1545

Part	Datasheet
AS1545	AS1545 (pdf)

PDF Datasheet Preview
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-todigital 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 6channel 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 dataacquisition devices. The AS1545 is available in a 32-lead TQFN package. Figure 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 feedback 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 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 REFB DGND DGND 1 - 34 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 Timing Characteristics 9 7 Typical Operating Characteristics 10 8 Terminology 15 9 Detailed Description 18 12 Package Drawings and Markings 32 13 Ordering Information 33 2 - 34 AS1545 Datasheet - Pinout 4 Pinout Pin Assignment Figure Pin Assignments Top View DVDD VDRIVE DOUTA DGND DOUTB SCLK CSN A0 32 31 30 29 28 27 26 25 DGND 1 24 A1 REF_SELECT 2 23 A2 AVDD 3 REFA 4 AS1545 22 SGL/DIFF 21 RANGE AGND 5 20 REFB AGND 6 19 AGND AIN 0 7 AIN 1 8 33 Exp. Pad 18 BIN 0 17 BIN 1 9 10 11 12 13 14 15 16 AIN 2 AIN 3 AIN 4 AIN 5 BIN 5 BIN 4 BIN 3 BIN 2 Pin Description Table Pin Description Pin Number Pin Name 1, 29 DGND 2 3 4, 20 REF_SELECT AVDD REFA, REFB 5 6, 19 7 to 12 AGND AIN0 to AIN5 Digital Ground. Ground reference point for the digital portion of the AS1545. Reference select pin. Internal/External Reference Selection. Logic input. If this pin is tied to DGND, the on-chip 2.5V reference is used as the reference source for both ADC A and ADC B. In addition, Pin REFA and Pin REFB must be tied to decoupling capacitors. If the REF SELECT pin is tied to a logic high, an external reference can be supplied to the AS1545 through the REFA or REFB pins. Analog Supply Voltage. 2.7V to 5.25V. Reference Input/Output. These pins are connected to the internal reference through a series resistor and is the reference source for the AS1545. The nominal reference voltage is 2.5V and appears at the pin. This pin can be over-driven by an external reference or can be taken as high as AVDD. Decoupling capacitors uF recommended are connected to these pins to decouple the reference buffer for each respective ADC. Analog Ground. Decouple point for AVDD. Ground reference for track/hold, reference, and DAC circuits. Datasheet - Ordering Information 13 Ordering Information The device is available as the standard products shown in Table Table Ordering Information Ordering Code Marking AS1545-BQFT Dual, 12-Bit, 1MSPS, SAR ADC AS1545 Delivery Form T&R Package 32-lead TQFN Note All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: For further information and requests, please contact us or find your local distributor at 33 - 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 owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 34 - 34

PDF Datasheet Preview

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-todigital 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 6channel 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 dataacquisition devices. The AS1545 is available in a 32-lead TQFN package.

Figure 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 feedback 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
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 REFB

DGND

DGND
1 - 34

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

Timing Characteristics 9 7 Typical Operating Characteristics 10 8 Terminology 15 9 Detailed Description 18
12 Package Drawings and Markings 32 13 Ordering Information 33
2 - 34

AS1545

Datasheet - Pinout
4 Pinout

Pin Assignment

Figure Pin Assignments Top View

DVDD VDRIVE DOUTA DGND DOUTB SCLK CSN A0
32 31 30 29 28 27 26 25

DGND 1
24 A1

REF_SELECT 2
23 A2

AVDD 3 REFA 4

AS1545
22 SGL/DIFF 21 RANGE

AGND 5
20 REFB

AGND 6
19 AGND

AIN 0 7 AIN 1 8
33 Exp. Pad
18 BIN 0 17 BIN 1
9 10 11 12 13 14 15 16

AIN 2 AIN 3 AIN 4 AIN 5 BIN 5 BIN 4 BIN 3 BIN 2

Pin Description

Table Pin Description

Pin Number

Pin Name
1, 29

DGND
2 3 4, 20

REF_SELECT AVDD

REFA, REFB
5 6, 19 7 to 12

AGND AIN0 to AIN5

Digital Ground. Ground reference point for the digital portion of the AS1545.

Reference select pin. Internal/External Reference Selection. Logic input. If this pin is tied to DGND, the on-chip 2.5V reference is used as the reference source for both ADC A and ADC B. In addition, Pin REFA and Pin REFB must be tied to decoupling capacitors. If the REF SELECT pin is tied to a logic high, an external reference can be supplied to the AS1545 through the REFA or REFB pins.

Analog Supply Voltage. 2.7V to 5.25V.

Reference Input/Output. These pins are connected to the internal reference through a series resistor and is the reference source for the AS1545. The nominal reference voltage is 2.5V and appears at the pin. This pin can be over-driven by an external reference or can be taken as high as AVDD. Decoupling capacitors uF recommended are connected to these pins to decouple the reference buffer for each respective ADC.

Analog Ground. Decouple point for AVDD. Ground reference for track/hold, reference, and DAC circuits.
Datasheet - Ordering Information
13 Ordering Information

The device is available as the standard products shown in Table
Table Ordering Information
Ordering Code

Marking

AS1545-BQFT

Dual, 12-Bit, 1MSPS, SAR ADC

AS1545

Delivery Form T&R

Package 32-lead TQFN

Note All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect:

For further information and requests, please contact us or find your local distributor at
33 - 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 owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.

Disclaimer

Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.

Contact Information

Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
34 - 34

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AS1545 Datasheet file may be downloaded here without warranties.

Datasheet ID: AS1545 519648