AD7484BST Analog Devices Inc, AD7484BST Datasheet

AD7484BST

Manufacturer Part Number

AD7484BST

Description

IC ADC 14BIT SAR 3MSPS 48-LQFP

Manufacturer

Analog Devices Inc

Datasheets

1.AD7484BSTZ.pdf (20 pages)

2.AD7484BST.pdf (12 pages)

Specifications of AD7484BST

Rohs Status

RoHS non-compliant

Number Of Bits

Sampling Rate (per Second)

Data Interface

Parallel

Number Of Converters

Power Dissipation (max)

90mW

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

48-LQFP

For Use With

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FEATURES

Fast throughput rate: 3 MSPS

Wide input bandwidth: 40 MHz

No pipeline delays with SAR ADC

Excellent DC accuracy performance

Two parallel interface modes

Low power: 90 mW (full power) and 2.5 mW (NAP mode)

Standby mode: 2 µA max

Single 5 V supply operation

Internal 2.5 V reference

Full-scale overrange mode (using 15th bit)

System offset removal via user access offset register

Nominal 0 V to 2.5 V input with shifted range capability

Pin compatible upgrade of 12-Bit AD7482

GENERAL DESCRIPTION

The AD7484 is a 14-bit, high speed, low power, successive

approximation ADC. The part features a parallel interface

with throughput rates up to 3 MSPS. The part contains a low

noise, wide bandwidth track-and-hold that can handle input

frequencies in excess of 40 MHz.

The conversion process is a proprietary algorithmic successive

approximation technique that results in no pipeline delays.

The input signal is sampled and a conversion is initiated on

the falling edge of the CONVST signal. The conversion process

is controlled via an internally trimmed oscillator. Interfacing

is via standard parallel signal lines, making the part directly

compatible with microcontrollers and DSPs.

The AD7484 provides excellent ac and dc performance

specifications. Factory trimming ensures high dc accuracy

resulting in very low INL, offset, and gain errors.

The part uses advanced design techniques to achieve very low

power dissipation at high throughput rates. Power consumption

in the normal mode of operation is 90 mW. There are two

Rev. A

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.

power saving modes: NAP mode, which keeps the reference

circuitry alive for a quick power-up while consuming 2.5 mW,

and standby mode, which reduces power consumption to a

mere 10 µW.

The AD7484 features an on-board 2.5 V reference but can also

accommodate an externally provided 2.5 V reference source.

The nominal analog input range is 0 V to 2.5 V, but an offset shift

capability allows this nominal range to be offset by ±200 mV. This

allows the user considerable flexibility in setting the bottom end

reference point of the signal range, a useful feature when using

single-supply op amps.

The AD7484 also provides the user with an 8% overrange

capability via a 15th bit. Therefore, if the analog input range

strays outside the nominal range by up to 8%, the user can still

accurately resolve the signal by using the 15th bit.

The AD7484 is powered by a 4.75 V to 5.25 V supply. The part

also provides a V

levels for the digital interface lines. The range for this V

is from 2.7 V to 5.25 V. The part is housed in a 48-lead LQFP

package and is specified over a −40°C to +85°C temperature

range.

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

Tel: 781.329.4700

Fax: 781.326.8703

REFSEL

CONVST

MODE1

MODE2

RESET

STBY

CLIP

NAP

VIN

FUNCTIONAL BLOCK DIAGRAM

3 MSPS, 14-Bit SAR ADC

DRIVE

REFERENCE

AD7484

T/H

AGND

2.5V

pin that allows the user to set the voltage

LOGIC AND I/O

REGISTERS

CONTROL

BIAS

Figure 1.

ALGORITHMIC

14-BIT

BU F

SAR

DRIVE

DGND

www.analog.com

AD7484

REFOUT

REFIN

D14

D13

D12

D11

D10

DRIVE

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