AD7895BR-2 Analog Devices Inc, AD7895BR-2 Datasheet

AD7895BR-2

Manufacturer Part Number

AD7895BR-2

Description

IC ADC 12BIT SRL 5V 8-SOIC

Manufacturer

Analog Devices Inc

Datasheet

1.AD7895ARZ-10REEL.pdf (12 pages)

Specifications of AD7895BR-2

Rohs Status

RoHS non-compliant

Number Of Bits

Sampling Rate (per Second)

192k

Data Interface

Serial

Number Of Converters

Power Dissipation (max)

20mW

Voltage Supply Source

Single Supply

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (0.154", 3.90mm Width)

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GENERAL DESCRIPTION

The AD7895 is a fast 12-bit ADC that operates from a single

+5 V supply and is housed in a small 8-pin mini-DIP and 8-pin

SOIC. The part contains a 3.8 s successive approximation A/D

converter, an on-chip track/hold amplifier, an on-chip clock and

a high speed serial interface.

Output data from the AD7895 is provided via a high speed,

serial interface port. This two-wire serial interface has a serial

clock input and a serial data output with the external serial clock

accessing the serial data from the part.

In addition to the traditional dc accuracy specifications such as

linearity and full-scale and offset errors, the AD7895 is specified

for dynamic performance parameters, including harmonic

distortion and signal-to-noise ratio.

The part accepts an analog input range of 10 V (AD7895-10),

from a single +5 V supply, consuming only 20 mW max.

The AD7895 features a high sampling rate mode and, for low

power applications, a proprietary automatic power-down mode

where the part automatically goes into power down once

conversion is complete and “wakes up” before the next conver-

sion cycle.

The part is available in a small, 8-pin, 0.3" wide, plastic dual-in-

line package (mini-DIP) and in an 8-pin, small outline IC (SOIC).

REV. 0

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.

2.5 V (AD7895-3), 0 V to 2.5 V (AD7895-2) and operates

FEATURES

Fast 12-Bit ADC with 3.8 s Conversion Time

8-Pin Mini-DlP and SOIC

Single 5 V Supply Operation

High Speed, Easy-to-Use, Serial Interface

On-Chip Track/Hold Amplifier

Selection of Input Ranges

High Input Impedance

Low Power: 20 mW max

14-Bit Pin Compatible Upgrade (AD7894)

0 V to +2.5 V for AD7895-2

10 V for AD7895-10

2.5 V for AD7895-3

PRODUCT HIGHLIGHTS

1. Fast, 12-Bit ADC in 8-Pin Package

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

Tel: 617/329-4700

Fax: 617/326-8703

2. Low Power, Single Supply Operation

3. High Speed Serial Interface

The AD7895 contains a 3.8 s ADC, a track/hold amplifier,

control logic and a high speed serial interface, all in an 8-pin

package. This offers considerable space saving over alterna-

tive solutions.

The AD7895 operates from a single +5 V supply and

consumes only 20 mW. 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 AD7895 ideal for battery-powered or portable

applications.

The part provides high speed serial data and serial clock lines

allowing for an easy, two-wire serial interface arrangement.

CONVST

FUNCTIONAL BLOCK DIAGRAM

5 V, 12-Bit, Serial 3.8 s

*AD7895-10, AD7895-3

AD7895

ADC in 8-Pin Package

SCALING*

GND

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

SIGNAL

TRACK/HOLD

BUSY

REF IN

SCLK

OUTPUT

AD7895

12-BIT

ADC

SDATA

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AD7895BR-2 Summary of contents

Page 1

FEATURES Fast 12-Bit ADC with 3.8 s Conversion Time 8-Pin Mini-DlP and SOIC Single 5 V Supply Operation High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier Selection of Input Ranges 10 V for AD7895-10 2.5 V for AD7895-3 0 ...

Page 2

AD7895–SPECIFICATIONS Parameter 2 DYNAMIC PERFORMANCE 3 Signal to (Noise + Distortion) Ratio @ + MIN MAX 3 Total Harmonic Distortion (THD) 3 Peak Harmonic or Spurious Noise 3 Intermodulation Distortion (IMD) 2nd Order Terms 3rd Order ...

Page 3

... SOIC Package, Power Dissipation . . . . . . . . . . . . . . . 450 mW Thermal Impedance . . . . . . . . . . . . . . . . . . . . 170 C/W JA Lead Temperature, Soldering Vapor Phase (60 sec +215 C Infrared (15 sec +220 C Model Temperature Range AD7895AN-2 – +85 C AD7895AR-2 – +85 C AD7895BR-2 – +85 C AD7895AN-10 – +85 C AD7895AR-10 – +85 C AD7895BR-10 – +85 C AD7895AN-3 – +125 C AD7895AR-3 – + Plastic DIP SOIC ...

Page 4

AD7895 Pin Pin No. Mnemonic Description 1 REF IN Voltage Reference Input. An external reference source should be connected to this pin to provide the refer- ence voltage for the AD7895’s conversion process. The REF IN input is buffered on ...

Page 5

TERMINOLOGY Signal to (Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the A/D converter. The signal is the rms amplitude of the fundamental. Noise is the rms sum of ...

Page 6

AD7895 CONVERTER DETAILS The AD7895 is a fast, 12-bit single supply A/D converter. It provides the user with signal scaling, track/hold, A/D converter and serial interface logic functions on a single chip. The A/D converter section of the AD7895 consists ...

Page 7

The track/hold amplifier acquires an input signal to 12-bit accuracy in less than 0.3 s. The operation of the track/hold is essentially transparent to the user. With the high sampling operating mode, the track/hold amplifier goes from its tracking mode ...

Page 8

AD7895 than the 9.8 s shown in diagram from the rising edge of CONVST. This is because the Track/Hold amplifier goes into its hold mode on the falling edge of CONVST, and the conver- sion will not be complete for ...

Page 9

MICROPROCESSOR/MICROCONTROLLER INTERFACE The AD7895 provides a three-wire serial interface that can be used for connection to the serial ports of DSP processors and microcontrollers. Figures 6 through 9 show the AD7895 interfaced to a number of different microcontrollers and DSP ...

Page 10

AD7895 IRQ2 RFS1 ADSP-2103/5 SCLK1 DR1 Figure 8. AD7896 to ADSP-2103 /5 Interface The timing relationship between the SCLK1 and RFS1 outputs of the ADSP-2103/5 are such that the delay between the rising edge of the SCLK1 and the rising ...

Page 11

Dynamic Performance (Mode 1 Only) With a combined conversion and acquisition time of 4.1 s, the AD7895 is ideal for wide bandwidth signal processing applica- tions. These applications require information on the ADC’s effect on the spectral content of the ...

Page 12

AD7895 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 ...

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