HSC-INTERFACEBOARD AD [Analog Devices], HSC-INTERFACEBOARD Datasheet

HSC-INTERFACEBOARD

Manufacturer Part Number

HSC-INTERFACEBOARD

Description

1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs

Manufacturer

AD [Analog Devices]

Datasheet

1.HSC-INTERFACEBOARD.pdf (16 pages)

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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.

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 band-

width track/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. The 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 conversion is

complete. There are no pipelined delays associated with the part.

The conversion result is accessed via standard CS and RD sig-

nals over a high speed parallel interface.

The AD7470/AD7472 uses advanced design techniques to

achieve very low power dissipation at high throughput rates. With

3 V supplies and 1.5 MSPS throughput rate, the AD7470 typi-

cally 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. A

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

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

Tel: 781/329-4700

Fax: 781/326-8703

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. Using this method

allows very low power dissipation numbers at lower throughput

rates. In this mode, the AD7472 can be operated with 3 V sup-

plies 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 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-

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

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

APPROXIMATION

SUCCESSIVE

CONTROL

10-/12-BIT

LOGIC

REF IN

ADC

AD7470/AD7472

AGND

1.75 MSPS, 4 mW

DGND

DRIVERS

OUTPUT

DRIVE

DB9 (DB11)

DB0

CLK IN

BUSY

Related parts for HSC-INTERFACEBOARD

HSC-INTERFACEBOARD Summary of contents

Page 1

FEATURES Specified for 1.75 MSPS for AD7470 (10-Bit) 1.5 MSPS for AD7472 (12-Bit) Low Power AD7470: 3.34 mW Typ at 1.5 MSPS with 3 V Supplies 7.97 mW Typ at 1.75 ...

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 ...

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

Page 5

... AD7472BRU 2 EVAL-AD7470CB 2 EVAL-AD7472CB 3 EVAL-CONTROL BOARD HSC-INTERFACE BOARD NOTES SOIC TSSOP. 2 This can be used as a stand-alone evaluation board or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes. 3 This board is a complete unit allowing control and communicate with all Analog Devices evaluation boards ending in the CB designators. ...

Page 6

AD7470/AD7472 Pin Mnemonic Function CS Chip Select. Active low logic input used in conjunction with RD to access the conversion result. The conversion result is placed on the data bus following the falling edge of both CS and RD. CS ...

Page 7

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 8

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

Page 9

ADC TRANSFER FUNCTION The output coding of the AD7470/AD7472 is straight binary. The designed code transitions occur at successive integer LSB values (i.e., 1 LSB, 2 LSB, etc.). The LSB size is = (REF IN)/ 4096 for the AD7472 and ...

Page 10

AD7470/AD7472 PARALLEL INTERFACE The parallel interface of the AD7470 and AD7472 is 10-bits and 12-bits wide respectively. The output data buffers are acti- vated when both CS and RD are logic low. At this point the contents of the data ...

Page 11

CONVERT CONVST BUSY CS RD DBx OPERATING MODES The AD7470 and AD7472 have two possible modes of opera- tion depending on the state of the CONVST pulse at the end of a conversion, Mode 1 and Mode 2. There ...

Page 12

AD7470/AD7472 Mode 1 Figure 14 shows the AD7472 conversion sequence in Mode 1 using a throughput rate of 500 kSPS and a clock frequency of 26 MHz supply the current consumption for the part when converting is ...

Page 13

CODE Figure 19. Typical DNL for 2. +25 ° AD7472 + AD7470 +3V ...

Page 14

AD7470/AD7472 V IN AD780 0 OUT GROUNDING AND LAYOUT The analog and digital power supplies are independent and separately pinned out to minimize coupling between analog and digital sections within the device. To complement the excellent noise performance ...

Page 15

Internal are decoded into MS ADDR , these lines are then asserted 25–24 3-0 as chip selects. The DMAR (DMA Request 1) is used in this 1 setup as the interrupt to ...

Page 16

AD7470/AD7472 PIN 1 0.0118 (0.30) 0.0040 (0.10) PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead SOIC (R-24) 0.6141 (15.60) 0.5985 (15.20 0.2992 (7.60) 0.2914 (7.40) 0.4193 (10.65 ...

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