EVAL-CONTROLBRD2 AD [Analog Devices], EVAL-CONTROLBRD2 Datasheet

EVAL-CONTROLBRD2

Manufacturer Part Number

EVAL-CONTROLBRD2

Description

Differential Input, 1MSPS, 12-Bit ADC in ?SO-8 and S0-8

Manufacturer

AD [Analog Devices]

Datasheet

1.EVAL-CONTROLBRD2.pdf (24 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.

REV. PrJ 27/02/02

FEATURES

Fast Throughput Rate: 1MSPS

Specified for V

Low Power at max Throughput Rate:

Fully Differential Analog Input

Wide Input Bandwidth:

Flexible Power/Serial Clock Speed Management

No Pipeline Delays

High Speed Serial Interface - SPI

Powerdown

8 Pin µSOIC and SOIC Packages

APPLICATIONS

Transducer Interface

Battery Powered Systems

Data Acquisition Systems

Portable Instrumentation

Motor Control

Communications

MicroWire is a trademark of National Semiconductor Corporation.

SPI and QSPI are trademarks of Motorola, Inc.

GENERAL DESCRIPTION

The AD7450 is a 12-bit, high speed, low power, succes-

sive-approximation (SAR) analog-to-digital converter

featuring a fully differential analog input. It operates from

a single 3 V or 5 V power supply and features throughput

rates up to 833kSPS or 1MSPS respectively.

This part contains a low-noise, wide bandwidth, differen-

tial track and hold amplifier (T/H) which can handle

input frequencies in excess of 1MHz with the -3dB point

being 20MHz typically. The reference voltage for the

AD7450 is applied externally to the V

varied from 100 mV to 2.5 V depending on the power

supply and to suit the application. The value of the refer-

ence voltage determines the common mode voltage range

of the part. With this truly differential input structure and

variable reference input, the user can select a variety of

input ranges and bias points.

The conversion process and data acquisition are controlled

using

face with Microprocessors or DSPs. The input signals are

sampled on the falling edge of

also initiated at this point.

Preliminary Technical Data

70dB SINAD at 300kHz Input Frequency

3 mW typ at 833kSPS with 3 V Supplies

8 mW typ at 1MSPS with 5 V Supplies

MicroWire

and the serial clock allowing the device to inter-

Mode: 1µA max

of 3 V and 5 V

/ DSP Compatible

PRELIMINARY TECHNICAL DATA

and the conversion is

REF

/QSPI

pin and can be

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

Tel: 781/329-4700

Fax: 781/326-8703

The SAR architecture of this part ensures that there are

no pipeline delays.

The AD7450 uses advanced design techniques to achieve

very low power dissipation at high throughput rates.

PRODUCT HIGHLIGHTS

1.Operation with either 3 V or 5 V power supplies.

2.High Throughput with Low Power Consumption.

3.Fully Differential Analog Input.

4.Flexible Power/Serial Clock Speed Management.

5.Variable Voltage Reference Input.

6.No Pipeline Delay.

7.Accurate control of the sampling instant via a

8. ENOB > 8 bits typ with 100mV Reference

V REF

V IN+

V IN-

and once off conversion control.

With a 3V supply, the AD7450 offers 3mW typ power

consumption for 833kSPS throughput.

The conversion rate is determined by the serial clock,

allowing the power to be reduced as the conversion time

is reduced through the serial clock speed increase. This

part also features a shutdown mode to maximize power

efficiency at lower throughput rates.

12-Bit ADC in µSO-8 and S0-8

FUNCTIONAL BLOCK DIAGRAM

AD7450

Differential Input, 1MSPS,

GND

V DD

T/H

12-BIT SUCCESSIVE

APPROXIMATION

CONTROL

LOGIC

ADC

AD7450

www.analog.com

SDATA

SCLK

input

Related parts for EVAL-CONTROLBRD2

EVAL-CONTROLBRD2 Summary of contents

Page 1

PRELIMINARY TECHNICAL DATA Preliminary Technical Data FEATURES Fast Throughput Rate: 1MSPS Specified for and Low Power at max Throughput Rate typ at 833kSPS with 3 V Supplies 8 mW typ at ...

PRELIMINARY TECHNICAL DATA AD7450 - SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to (Noise + Distortion) Ratio 2 (SINAD) Total Harmonic Distortion (THD) Peak Harmonic or Spurious Noise Intermodulation Distortion (IMD) Second Order Terms Third Order Terms 3 Aperture Delay 3 Aperture ...

Page 3

PRELIMINARY TECHNICAL DATA Parameter POWER REQUIREMENTS Normal Mode(Static) Normal Mode (Operational) Full Power-Down Mode Power Dissipation Normal Mode (Operational) Full Power-Down Temperature ranges as ...

Page 4

... This can be used as a stand-alone evaluation board or in conjunction with the EVALUATION BOARD CONTROLLER for evaluation/demonstration purposes. 3 EVALUATION BOARD CONTROLLER. This board is a complete unit allowing control and communicate with all Analog Devices evaluation boards ending in the CB designators SOIC µSOIC CAUTION ESD (electrostatic discharge) sensitive device ...

Page 5

PRELIMINARY TECHNICAL DATA Pin No. Pin Mnemonic Function 1 V Reference Input for the AD7450. An external reference must be applied to this input. For a REF 5 V power supply, the reference is 2.5 V (±1%) and for a ...

Page 6

PRELIMINARY TECHNICAL DATA AD7450 TERMINOLOGY Signal to (Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the ...

Page 7

PRELIMINARY TECHNICAL DATA PERFORMANCE CURVES TPC 1 and TPC 2 show the typical FFT plots for the AD7450 with and 3V, 1MHz and 833kHz sam- DD pling frequency respectively and an input frequency of 300kHz. 0 8192 ...

Page 8

PRELIMINARY TECHNICAL DATA AD7450 TPC 5 and TPC 6 show typical DNL plots for the AD7450 with and 3V, 1MHz and 833kHz DD sampling frequency respectively and an input frequency of 300kHz. 1 0.8 0.6 0.4 0.2 ...

Page 9

PRELIMINARY TECHNICAL DATA TPC 9 and TPC 10 show the change in DNL versus V for and 3.3V respectively Positive DNL 0.5 0 -0.5 Negative DNL -1 0 0.5 1 VREF TPC 9.Change in DNL ...

Page 10

PRELIMINARY TECHNICAL DATA AD7450 TPC 13 shows the change in Zero Code Error versus the Reference Voltage for and 3.3V VDD = 1MSPS -1 VDD = 3 ...

Page 11

PRELIMINARY TECHNICAL DATA TPC 17 shows the Common Mode Rejection Ratio versus supply ripple frequency for the AD7450 for both V 5V and 3 V. Here a 200mV p-p sine wave is coupled onto the Common Mode Voltage of V ...

Page 12

PRELIMINARY TECHNICAL DATA AD7450 1LSB = 2xV REF /4096 011...111 011...110 000...001 000...000 111...111 100...010 100...001 100...000 +V REF - 1LSB -V REF + 1LSB 0LSB ANALOG INPUT (V IN IN- ) Figure 5. AD7450 Ideal Transfer Characteristic ...

Page 13

PRELIMINARY TECHNICAL DATA TITLE Figure 8. Input Common Mode Range (CM) versus V (Vdd = 5V and V (max) = 2.5V) REF 0.75 1 1.25 1.5 ...

Page 14

PRELIMINARY TECHNICAL DATA AD7450 IN IN Figure 11. Equivalent Analog Input Circuit. Conversion Phase - Switches Open Track Phase - Switches Closed When no amplifier is used to ...

Page 15

PRELIMINARY TECHNICAL DATA The AD8138 is specified with and ±5 V power supplies but the best results are obtained when it is supplied by ± lower cost device that could also be used in ...

Page 16

PRELIMINARY TECHNICAL DATA AD7450 3.75V 2.5V 1.25V IN IN- R 3.75V 2.5V 1.25V Figure 16. Using an RF Transformer to Generate Differential Inputs REFERENCE SECTION An external reference source is required to supply the reference ...

Page 17

PRELIMINARY TECHNICAL DATA R +2.5V +2. -2.5V R 0.1µF EXTERNAL V REF (2.5V) Figure 18. Applying a Bipolar Single Ended Input to the AD7450 SERIAL INTERFACE Figure 19 shows a detailed timing diagram for the ...

Page 18

PRELIMINARY TECHNICAL DATA AD7450 t 2 10ns SCLK This 664ns satisfies the requirement of 275ns for t From Figure 20, t comprises of: ACQ 2.5(1 SCLK 8 QUIET where t = 45ns. ...

Page 19

PRELIMINARY TECHNICAL DATA In order to exit this mode of operation and power the AD7450 up again, a dummy conversion is performed. the falling edge of the device will begin to power up, and will continue to power up as ...

Page 20

PRELIMINARY TECHNICAL DATA AD7450 quired to change mode, then neither is a dummy cycle required to place the track and hold into track. POWER VERSUS THROUGHPUT RATE By using the power-down mode on the AD7450 when not converting, the average ...

Page 21

PRELIMINARY TECHNICAL DATA MICROPROCESSOR AND DSP INTERFACING The serial interface on the AD7450 allows the part to be directly connected to a range of different microproces- sors. This section explains how to interface the AD7450 with some of the more ...

Page 22

PRELIMINARY TECHNICAL DATA AD7450 AD7450* SCLK SDATA *ADDITIONAL PINS OMITTED FOR CLARITY Figure 27. Interfacing to the MC68HC16 AD7450 to DSP56xxx The connection diagram in figure 28 shows how the AD7450 can be connected to the SSI (Synchronous Serial Interface) ...

Page 23

... PC via the EVALUATION BOARD CONTROLLER. The EVALUATION BOARD CON- TROLLER can be used in conjunction with the AD7450 evaluation board, as well as many other Analog Devices’ evaluation boards ending with the CB designator, to dem- onstrate/evaluate the ac and dc performance of the AD7450. ...

Page 24

PRELIMINARY TECHNICAL DATA AD7450 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-lead SOIC (SO- 968 (5 890 (4 574 (4.00 440 (6.20 ...

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