AD7863BR-3 Analog Devices Inc, AD7863BR-3 Datasheet

AD7863BR-3

Manufacturer Part Number

AD7863BR-3

Description

IC ADC 14BIT DUAL 2CH 28-SOIC

Manufacturer

Analog Devices Inc

Datasheet

1.AD7863ARZ-3.pdf (24 pages)

Specifications of AD7863BR-3

Rohs Status

RoHS non-compliant

Number Of Bits

Sampling Rate (per Second)

175k

Data Interface

Parallel

Number Of Converters

Power Dissipation (max)

94.5mW

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

28-SOIC (0.300", 7.50mm Width)

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FEATURES

Two fast 14-bit ADCs

Four input channels

Simultaneous sampling and conversion

5.2 μs conversion time

Single supply operation

Selection of input ranges

High speed parallel interface

Low power, 70 mW typical

Power saving mode, 105 μW maximum

Overvoltage protection on analog inputs

14-bit lead compatible upgrade to AD7862

GENERAL DESCRIPTION

The AD7863 is a high speed, low power, dual 14-bit analog-to-

digital converter that operates from a single 5 V supply.

The part contains two 5.2 μs successive approximation ADCs, two

track/hold amplifiers, an internal 2.5 V reference and a high speed

parallel interface. Four analog inputs are grouped into two channels

(A and B) selected by the A0 input. Each channel has two inputs

simultaneously, thus preserving the relative phase information of

the signals on both analog inputs. The part accepts an analog input

range of ±10 V (AD7863-10), ±2.5 V (AD7863-3), and 0 V to

2.5 V (AD7863-2). Overvoltage protection on the analog inputs

for the part allows the input voltage to go to ±17 V, ±7 V, or +7 V

respectively, without causing damage.

A single conversion start signal ( CONVST ) simultaneously places

both track/holds into hold and initiates conversion on both

channels. The BUSY signal indicates the end of conversion and at

this time the conversion results for both channels are available to be

read. The first read after a conversion accesses the result from V

or V

depending on whether the multiplexer select (A0) is low or high,

respectively. Data is read from the part via a 14-bit parallel data bus

with standard CS and RD signals. In addition to the traditional dc

accuracy specifications such as linearity, gain, and offset errors, the

part is also specified for dynamic performance parameters

including harmonic distortion and signal-to-noise ratio.

The AD7863 is fabricated in the Analog Devices, Inc. linear

compatible CMOS (LC

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. Specifications subject to change without notice. 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.

±10 V for AD7863-10

±2.5 V for AD7863-3

0 V to 2.5 V for AD7863-2

and V

, and the second read accesses the result from V

or V

and V

MOS) process, a mixed technology

) that can be sampled and converted

or V

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

Tel: 781.329.4700

Fax: 781.461.3113

process that combines precision bipolar circuits with low power

CMOS logic. It is available in 28-lead SOIC_W and SSOP.

PRODUCT HIGHLIGHTS

The AD7863 features two complete ADC functions

allowing simultaneous sampling and conversion of two

channels. Each ADC has a two-channel input mux. The

conversion result for both channels is available 5.2 μs after

initiating conversion.

The AD7863 operates from a single 5 V supply and

consumes 70 mW typical. The automatic power-down

mode, where the part goes into power-down once

conversion is complete and wakes up before the next

conversion cycle, makes the AD7863 ideal for battery-

powered or portable applications.

The part offers a high speed parallel interface for easy

connection to microprocessors, microcontrollers, and

digital signal processors.

The part is offered in three versions with different analog

input ranges. The AD7863-10 offers the standard industrial

input range of ±10 V; the AD7863-3 offers the common

signal processing input range of ±2.5 V, while the AD7863-2

can be used in unipolar 0 V to 2.5 V applications.

The part features very tight aperture delay matching

between the two input sample and hold amplifiers.

SCALING

Dual 175 kSPS 14-Bit ADC

SIGNAL

FUNCTIONAL BLOCK DIAGRAM

Simultaneous Sampling

REF

CONTROL LOGIC

MUX

CONVERSION

2kΩ

BUSY

REFERENCE

TRACK/

CONVST

Figure 1.

HOLD

2.5V

14-BIT

ADC

AGND

CLOCK

AGND

AD7863

www.analog.com

OUTPUT

LATCH

DGND

DB0

DB13

Related parts for AD7863BR-3

AD7863BR-3 Summary of contents

Page 1

FEATURES Two fast 14-bit ADCs Four input channels Simultaneous sampling and conversion 5.2 μs conversion time Single supply operation Selection of input ranges ±10 V for AD7863-10 ±2.5 V for AD7863 2.5 V for AD7863-2 High speed ...

Page 2

AD7863 TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Characteristics ................................................................ 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and ...

Page 3

SPECIFICATIONS ± 5%, AGND = DGND = 0 V, REF = Internal. All specifications T DD Table 1. Parameter SAMPLE AND HOLD −3 dB Small Signal Bandwidth 2 Aperture Delay 2 Aperture Jitter 2 Aperture Delay ...

Page 4

AD7863 Parameter REFERENCE INPUT/OUTPUT REF IN Input Voltage Range REF IN Input Current REF OUT Output Voltage REF OUT Error @ 25°C REF OUT Error MIN MAX REF OUT Temperature Coefficient LOGIC INPUTS Input High Voltage, V ...

Page 5

TIMING CHARACTERISTICS ± 5%, AGND = DGND = 0 V, REF = Internal. All specifications T DD Table Parameter A, B Versions t 5.2 CONV t 0.5 ACQ Parallel Interface ...

Page 6

AD7863 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V to AGND DGND DD Analog Input Voltage to AGND AD7863-10 AD7863-3 AD7863-2 Reference Input Voltage to AGND Digital Input Voltage to DGND ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description DB12 to DB7 Data Bit 12 to Data Bit 7. Three-state TTL outputs. 7 DGND Digital Ground. Ground reference for digital circuitry. 8 ...

Page 8

AD7863 TERMINOLOGY Signal-to-(Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the analog-to-digital converter. The signal is the rms amplitude of the fundamental. Noise is the rms sum of all ...

Page 9

CONVERTER DETAILS The AD7863 is a high speed, low power, dual 14-bit analog-to- digital converter that operates from a single 5 V supply. The part contains two 5.2 μs successive approximation ADCs, two track-and-hold amplifiers, an internal 2.5 V reference, ...

Page 10

AD7863 CIRCUIT DESCRIPTION ANALOG INPUT SECTION The AD7863 is offered as three part types: the AD7863-10, which handles a ±10 V input voltage range, the AD7863-3, which handles input voltage range ±2.5 V and the AD7863-2, which handles a 0 ...

Page 11

Gain error can be adjusted at either the first code transition (ADC negative full scale) or the last code transition (ADC positive full scale). The trim procedures for both cases are as follows: Positive Full-Scale Adjust (−10 Version) Apply a ...

Page 12

AD7863 Read Options Apart from the read operation previously described and displayed in Figure 7, other CS and RD combinations can result in different channels/inputs being read in different combinations. Suitable combinations are shown in Figure 8, Figure 9, and ...

Page 13

OPERATING MODES MODE 1 OPERATION Normal Power, High Sampling Performance The timing diagram in Figure 7 is for optimum performance in operating Mode 1 where the falling edge of CONVST starts conversion and puts the track-and-hold amplifiers into their hold ...

Page 14

AD7863 AD7863 DYNAMIC SPECIFICATIONS The AD7863 is specified and tested for dynamic performance as well as traditional dc specifications such as integral and differential nonlinearity. These ac specifications are required for the signal processing applications such as phased array sonar, ...

Page 15

TOTAL HARMONIC DISTORTION (THD) Total harmonic distortion (THD) is the ratio of the rms sum of harmonics to the rms value of the fundamental. For the AD7863, THD is defined ...

Page 16

AD7863 POWER CONSIDERATIONS In the automatic power-down mode the part can be operated at a sample rate that is considerably less than 175 kHz. In this case, the power consumption is reduced and depends on the sample rate. Figure 18 ...

Page 17

MICROPROCESSOR INTERFACING The AD7863 high speed bus timing allows direct interfacing to DSP processors as well as modern 16-bit microprocessors. Suitable microprocessor interfaces are shown in Figure 19 through Figure 23. AD7863 TO ADSP-2100 INTERFACE Figure 19 shows an interface ...

Page 18

AD7863 A15 ADDRESS BUS A0 TMS320C25 ADDRESS DECODE IS EN INTn STRB R/W READY MSC DMD15 DATA BUS DMD0 *ADDITIONAL PINS OMITTED FOR CLARITY. Figure 21. AD7863 to TMS320C25 Interface Some applications may require that the conversion be initiated by ...

Page 19

Vector control motor involves controlling the phase in addition to drive and current frequency. Controlling the phase of the motor requires feedback information on the position of the rotor relative to the rotating magnetic field in the ...

Page 20

AD7863 APPLICATIONS HINTS PC BOARD LAYOUT CONSIDERATIONS The AD7863 is optimally designed for lowest noise performance, both radiated and conducted noise. To complement the excellent noise performance of the AD7863 it is imperative that great care be given to the ...

Page 21

OUTLINE DIMENSIONS 28 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 2.00 MAX 0.05 MIN COPLANARITY 0.10 18.10 (0.7126) 17.70 (0.6969) 15 7.60 (0.2992) 7.40 (0.2913) 1 10.65 (0.4193) 14 10.00 (0.3937) 2.65 (0.1043) 2.35 (0.0925) SEATING 0.51 (0.0201) 1.27 (0.0500) PLANE ...

Page 22

... AD7863AR-3REEL ±2.5 V AD7863AR-3REEL7 ±2 AD7863ARZ-3 ±2.5 V AD7863ARS-3 ±2.5 V AD7863ARS-3REEL ±2.5 V AD7863ARS-3REEL7 ±2 AD7863ARSZ-3 ±2 AD7863ARSZ-3REEL ±2 AD7863ARSZ-3REEL7 ±2.5 V AD7863BR-3 ±2.5 V AD7863BR-3REEL ±2.5 V AD7863BR-3REEL7 ±2 AD7863BRZ-3 ±2.5 V AD7863AR 2.5 V AD7863AR-2REEL 2.5 V AD7863AR-2REEL7 2 AD7863ARZ 2 AD7863ARZ-2REEL 2 AD7863ARZ-2REEL7 2.5 V AD7863ARS 2.5 V AD7863ARS-2REEL 2.5 V AD7863ARS-2REEL7 2.5 V ...

Page 23

NOTES Rev Page AD7863 ...

Page 24

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