AD7865BSZ-1 Analog Devices Inc, AD7865BSZ-1 Datasheet

4 CH. SIMULTANEOUS BIPOLAR,14-B ADC I.C.

AD7865BSZ-1

Manufacturer Part Number

AD7865BSZ-1

Description

4 CH. SIMULTANEOUS BIPOLAR,14-B ADC I.C.

Manufacturer

Analog Devices Inc

Datasheet

1.AD7865AS-2REEL.pdf (19 pages)

Specifications of AD7865BSZ-1

Number Of Bits

Sampling Rate (per Second)

350k

Data Interface

Parallel

Number Of Converters

Power Dissipation (max)

160mW

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

44-MQFP, 44-PQFP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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AD7865BSZ-1REEL

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GENERAL DESCRIPTION

The AD7865 is a fast, low power, four-channel simultaneous

sampling 14-bit A/D converter that operates from a single 5 V

supply. The part contains a 2.4 µs successive approximation

ADC, four track/hold amplifiers, 2.5 V reference, on-chip clock

oscillator, signal conditioning circuitry and a high speed parallel

interface. The input signals on four channels are sampled simul-

taneously thus preserving the relative phase information of the

signals on the four analog inputs. The part accepts analog input

ranges of ± 10 V, ± 5 V, ± 2.5 V, 0 V to 2.5 V and 0 V to 5 V.

The part allows any subset of the four channels to be converted

in order to maximize the throughput rate on the selected sequence.

The channels to be converted can be selected either via hard-

ware (channel select input pins) or via software (programming

the channel select register).

A single conversion start signal (CONVST) simultaneously places

all the track/holds into hold and initiates conversion sequence

for the selected channels. The EOC signal indicates the end of

each individual conversion in the selected conversion sequence.

The BUSY signal indicates the end of the conversion sequence.

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

standard CS and RD signals. Maximum throughput for a single

channel is 350 kSPS. For all four channels the maximum through-

put is 100 kSPS.

The AD7865 is available in a small (0.3 sq. inch area) 44-lead

PQFP.

PRODUCT HIGHLIGHTS

1. The AD7865 features four Track/Hold amplifiers and a fast

2. The AD7865 operates from a single 5 V supply and con-

3. The part offers a high speed parallel interface for easy con-

4. The part is offered in three versions with different analog

5. The part features very tight aperture delay matching between

FRSTDATA

(2.4 µs) ADC allowing simultaneous sampling and then con-

version of any subset of the four channels.

sumes only 115 mW typ, making it ideal for low power and

portable applications.

nection to microprocessors, microcontrollers and digital

signal processors.

input ranges. The AD7865-1 offers the standard industrial

ranges of ± 10 V and ± 5 V; the AD7865-2 offers a unipolar

range of 0 V to 2.5 V or 0 V to 5 V and the AD7865-3 offers

the common signal processing input range of ± 2.5 V.

the four input sample and hold amplifiers.

STBY

BUSY

EOC

IN1B

IN2A

IN2B

IN3A

IN3B

IN4A

IN4B

IN1A

Four-Channel, Simultaneous

Sampling, Fast, 14-Bit ADC

CONVST

SCALING

SIGNAL

FUNCTIONAL BLOCK DIAGRAM

TRACK/HOLD

CONTROL LOGIC

CONVERSION

SL3 SL4 H/S

MUX

REF

SEL

14-BIT

ADC

CLK IN

/SL1

CHANNEL

REFAGND

SELECT

INT/EXT

CLOCK

REFERENCE

CLK/SL2

INT/EXT

+2.5V

OUTPUT

AD7865

LATCH

AD7865

DB0–DB3

AGND

CLOCK

INT

DRIVE

AGND

DB13

DB0

DGND

AGND

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