ad7472bru-reel7 Analog Devices, Inc., ad7472bru-reel7 Datasheet

ad7472bru-reel7

Manufacturer Part Number

ad7472bru-reel7

Description

1.75 Msps, 4 Mw 10-bit /12-bit Parallel Adcs

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD7472BRU-REEL7.pdf (20 pages)

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GENERAL DESCRIPTION

The AD7470/AD7472 are 10-bit/12-bit high speed, low power,

successive approximation ADCs. The parts operate from a single

2.7 V to 5.25 V power supply and feature throughput rates up to

1.5 MSPS for the 12-bit AD7472 and up to 1.75 MSPS for the

10-bit AD7470. The parts contain a low noise, wide bandwidth

track-and-hold amplifier that can handle input frequencies in

excess of 1 MHz.

The conversion process and data acquisition are controlled

using standard control inputs, allowing easy interfacing to

microprocessors or DSPs. The input signal is sampled on the

falling edge of CONVST, and conversion is also initiated at

this point. BUSY goes high at the start of conversion and

goes low 531.66 ns after falling edge of CONVST (AD7472

with a clock frequency of 26 MHz) to indicate that the con-

version is complete. There are no pipeline delays associated

with the parts. The conversion result is accessed via standard

CS and RD signals over a high speed parallel interface.

The AD7470/AD7472 use advanced design techniques to

achieve very low power dissipation at high throughput rates. With

3 V supplies and 1.5 MSPS throughput rates, the AD7470

typically consumes, on average, just 1.1 mA. With 5 V supplies

and 1.75 MSPS, the average current consumption is typically

1.6 mA. The part also offers flexible power/throughput rate

management. Operating the AD7470 with 3 V supplies and

500 kSPS throughput reduces the current consumption to 713 µA.

At 5 V supplies and 500 kSPS, the part consumes 944 µA.

REV. B

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 that

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

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

FEATURES

Specified for V

1.75 MSPS for AD7470 (10-Bit)

1.5 MSPS for AD7472 (12-Bit)

Low Power

Wide Input Bandwidth

70 dB Typ SNR at 500 kHz Input Frequency

Flexible Power/Throughput Rate Management

No Pipeline Delays

High Speed Parallel Interface

Sleep Mode: 50 nA Typ

24-Lead SOIC and TSSOP Packages

AD7470: 3.34 mW Typ at 1.5 MSPS with 3 V Supplies

AD7472: 3.54 mW Typ at 1.2 MSPS with 3 V Supplies

7.97 mW Typ at 1.75 MSPS with 5 V Supplies

8.7 mW Typ at 1.5 MSPS with 5 V Supplies

of 2.7 V to 5.25 V

It is also possible to operate the parts in an auto sleep mode,

where the part wakes up to do a conversion and automatically

enters sleep mode at the end of conversion. This method allows

very low power dissipation numbers at lower throughput rates.

In this mode, the AD7472 can be operated with 3 V supplies at

100 kSPS, and consume an average current of just 124 µA. At

5 V supplies and 100 kSPS, the average current consumption is

171 µA.

The analog input range for the part is 0 V to REF IN. The 2.5 V

reference is applied externally to the REF IN pin. The conver-

sion rate is determined by the externally-applied clock.

PRODUCT HIGHLIGHTS

1. High Throughput with Low Power Consumption. The

2. Flexible Power/Throughput Rate Management. The conver-

3. No Pipeline Delay. The part features a standard successive

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

Tel: 781/329-4700

Fax: 781/326-8703

CONVST

AD7470 offers 1.75 MSPS throughput and the AD7472

offers 1.5 MSPS throughput rates with 4 mW power

consumption.

sion rate is determined by an externally-applied clock allow-

ing the power to be reduced as the conversion rate is reduced.

The part also features an auto sleep mode to maximize power

efficiency at lower throughput rates.

approximation ADC with accurate control of the sampling

instant via a CONVST input and once off conversion control.

10-Bit/12-Bit Parallel ADCs

AD7470 IS A 10-BIT PART WITH DB0 TO DB9 AS OUTPUTS.

AD7472 IS A 12-BIT PART WITH DB0 TO DB11 AS OUTPUTS.

AD7470/AD7472

FUNCTIONAL BLOCK DIAGRAM

T/H

APPROXIMATION

SUCCESSIVE

CONTROL

10-/12-BIT

LOGIC

REF IN

ADC

AD7470/AD7472

AGND

1.75 MSPS, 4 mW

DGND

DRIVERS

OUTPUT

DRIVE

www.analog.com

DB9 (DB11)

DB0

CLK IN

BUSY

Related parts for ad7472bru-reel7

ad7472bru-reel7 Summary of contents

Page 1

... No Pipeline Delay. The part features a standard successive approximation ADC with accurate control of the sampling instant via a CONVST input and once off conversion control. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. V DRIVE DB9 (DB11) OUTPUT DRIVERS ...

Page 2

AD7470/AD7472 AD7470–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ACCURACY ...

Page 3

AD7472–SPECIFICATIONS Parameter A Version DYNAMIC PERFORMANCE 5 V Signal to Noise + Distortion (SINAD Signal-to-Noise Ratio (SNR Total Harmonic Distortion (THD) –83 –83 –75 Peak Harmonic or Spurious Noise (SFDR) –86 –86 –76 Intermodulation Distortion (IMD) ...

Page 4

AD7470/AD7472 AD7472–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to Noise + Distortion (SINAD) Signal-to-Noise Ratio (SNR) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise (SFDR) Intermodulation Distortion (IMD) Second-Order Terms Third-Order Terms Aperture Delay Aperture Jitter Full Power Bandwidth DC ACCURACY ...

Page 5

TIMING SPECIFICATIONS Limit at T Parameter AD7470 CLK 30 t 436.42 CONVERT t 1 WAKEUP ...

Page 6

... Industrial (Y Version –40°C to +125°C Storage Temperature Range . . . . . . . . . . . –65°C to +150°C Model AD7470ARU AD7470ARU-REEL AD7470ARU-REEL7 AD7472AR AD7472AR-REEL AD7472AR-REEL7 AD7472ARU AD7472ARU-REEL AD7472ARU-REEL7 AD7472BR AD7472BR-REEL AD7472BRU AD7472BRU-REEL AD7472BRU-REEL7 AD7472YR AD7472YR-REEL AD7472YRU AD7472YRU-REEL AD7472YRU-REEL7 2 EVAL-AD7470CB 2 EVAL-AD7472CB 3 EVAL CONTROL BRD2 NOTES SOIC TSSOP. 2 This can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes ...

Page 7

DB7 1 DB8 2 (MSB) DB9 REF IN 5 AD7470 TOP VIEW (Not to Scale) AGND CONVST 10 CLKIN 11 BUSY CONNECT Mnemonic Function ...

Page 8

AD7470/AD7472 Mnemonic Function DGND Digital Ground. This is the ground reference point for all digital circuitry on the AD7470 and AD7472. The DGND and AGND voltages should ideally be at the same potential and must not be more than 0.3 ...

Page 9

TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The end- points of the transfer function are zero scale, a point 1/2 LSB below the first code transition, ...

Page 10

AD7470/AD7472 CIRCUIT DESCRIPTION CONVERTER OPERATION The AD7470/AD7472 are 10-bit/12-bit successive approxima- tion analog-to-digital converters based around a capacitive DAC. The AD7470/AD7472 can convert analog input signals in the range Figure 2 shows a very simplified ...

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ad7472bru-reel7 Analog Devices, Inc., ad7472bru-reel7 Datasheet

ad7472bru-reel7

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