AD73360ASU Analog Devices Inc, AD73360ASU Datasheet

AD73360ASU

Manufacturer Part Number

AD73360ASU

Description

IC ANALOG FRONT END 6CH 44-TQFP

Manufacturer

Analog Devices Inc

Datasheets

1.AD73360LARZ-REEL.pdf (35 pages)

2.AD73360LARZ-REEL.pdf (2 pages)

Specifications of AD73360ASU

Number Of Channels

Rohs Status

RoHS non-compliant

Number Of Bits

Power (watts)

80mW

Voltage - Supply, Analog

Voltage - Supply, Digital

Package / Case

44-TQFP, 44-VQFP

Analog Front End Type

General Purpose

Analog Front End Category

General Purpose

Interface Type

Serial (6-Wire)

Sample Rate

64KSPS

Input Voltage Range

1.64375V

Operating Supply Voltage (min)

4.5V

Operating Supply Voltage (typ)

Operating Supply Voltage (max)

5.5V

Resolution

16b

Number Of Adc's

Power Supply Type

Analog/Digital

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Package Type

TQFP

For Use With

EVAL-AD73360LEB - BOARD EVAL FOR AD73360L

Lead Free Status / RoHS Status

Not Compliant

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Price

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Current page: 1 of 2
Download datasheet (26Kb)

A. This document details the limitations of the cascading option of the AD73360 due to a bug in the current silicon.

B. Analog Devices Inc. is committed, through future silicon revisions to continuously improve silicon functionality.

Analog Devices Inc. will use its best endeavors to ensure that these future silicon revisions remain compatible with your

present software/systems implementing the recommended work-arounds outlined in this document.

Background

The AD73360 has the option of being cascaded allowing additional analog input channels to be easily be added as re-

quired. Due to a bug in the present silicon there are limitations on how many devices can be cascaded together and is

also dependent on the sample rate and serial clock rate used.

Issue Description

When a number of AD73360s are cascaded together they each output ADC channel data in a time-division multiplexed

(TDM) format. For a cascade of N devices with all channels enabled the output sequence read by a DSP or Micro-con-

troller would be

Device N – Channel 1, Device N-1 - Channel 1… Device 1 - Channel 1,

Device N - Channel 2, Device N-1 – Channel 2 … Device 1 – Channel 2…,

… ,

Device N – Channel 6, Device N-1 – Channel6 …, Device 1 – Channel 6

As each device is programmed with the number of devices in the cascade it should therefore allow sufficient SCLKs for

all other devices to transmit the ADC result of one channel before starting to transmit the next. For example in a cascade

of two devices, Device 1 will transmit its Channel 1 result to Device 2 in 16 SCLK cycles. At the same time Device 2 is

transmitting its Channel 1 result to the DSP or Microcontroller. Device 1 will then allow 16 SCLKs, when it does not

transmit anything, allowing Device 2 to transmit the Channel 1 data from Device 1 to the DSP. An additional SCLK

cycle is added to allow the next channels data to begin being transmitted on the falling edge of the SDOFS pulse. Figure

1 shows the timing for a two device cascade.

Rev.A 6-2000

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

For cascades of more than two devices the AD73360 will leave too many SCLKs between transmitting channel

information. This increases the time it takes to transmit the ADC data and since a DSP or microcontroller must

read data from all the ADCs in the cascade in one sample period the number of devices which can be cascaded

will be limited. Figure 2 shows the effect the additional SCLKs have on a cascade of three devices.

4 5

DE V ICE 2 - CHA NNE L 1

6 7

8 9

10 11 12 13 14 15 16 1

Figure 1. Cascade Timing for a Two-Device Cascade

4 5

DE V ICE 1 - CHA NNE L 1

6 7

8 9

One Technology Way, P .O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

10 11 12 13 14 15 16 17

DE V ICE 2 - CHA NNE L 2

World Wide Web Site: http://www.analog.com

Errata Document

4 5

6 7

AD73360 Rev. 1

Analog Devices, Inc., 2000

Related parts for AD73360ASU

AD73360ASU Summary of contents

Page 1

... A. This document details the limitations of the cascading option of the AD73360 due to a bug in the current silicon. B. Analog Devices Inc. is committed, through future silicon revisions to continuously improve silicon functionality. Analog Devices Inc. will use its best endeavors to ensure that these future silicon revisions remain compatible with your present software/systems implementing the recommended work-arounds outlined in this document. ...

Page 2

ERRATA DOCUMENT vice ...

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