AD7893BR-5 Analog Devices, AD7893BR-5 Datasheet

AD7893BR-5

Manufacturer Part Number

AD7893BR-5

Description

LC2MOS 12-Bit/ Serial 6 us ADC in 8-Pin Package

Manufacturer

Analog Devices

Datasheet

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GENERAL DESCRIPTION

The AD7893 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 6 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 AD7893 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 traditional dc accuracy specifications such as lin-

earity, full-scale and offset errors, the AD7893 is also specified

for dynamic performance parameters, including harmonic dis-

tortion and signal-to-noise ratio.

The part accepts an analog input range of 10 V (AD7893-10),

(AD7893-2) and operates from a single +5 V supply, consuming

only 25 mW typical.

The AD7893 is fabricated in Analog Devices’ Linear Compat-

ible CMOS (LC

that combines precision bipolar circuits with low power CMOS

logic. The part is available in a small, 8-pin, 0.3" wide, plastic or

hermetic dual-in-line package (mini-DIP) and in an 8-pin, small

outline IC (SOIC).

REV. E

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 (AD7893-3), 0 V to +5 V (AD7893-5) or 0 V to +2.5 V

FEATURES

Fast 12-Bit ADC with 6 s Conversion Time

8-Pin Mini-DlP and SOIC

Single Supply Operation

High Speed, Easy-to-Use, Serial Interface

On-Chip Track/Hold Amplifier

Selection of Input Ranges

Low Power: 25 mW typ

0 V to +2.5 V for AD7893-2

0 V to +5 V for AD7893-5

10 V for AD7893-10

2.5 V for AD7893-3

MOS) process, a mixed technology process

PRODUCT HIGHLIGHTS

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

Tel: 617/329-4700

Fax: 617/326-8703

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

2. Low Power, Single Supply Operation

3. High Speed Serial Interface

The AD7893 contains a 6 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 AD7893 operates from a single +5 V supply and con-

sumes only 25 mW. This low power, single supply operation

makes it 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

*AD7893-5, AD7893-10, AD7893-3

FUNCTIONAL BLOCK DIAGRAM

AGND

MOS 12-Bit, Serial 6 s

SCALING*

AD7893

SIGNAL

ADC in 8-Pin Package

DGND

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

TRACK/

HOLD

REF IN

SCLK

AD7893

OUTPUT

12-BIT

ADC

SDATA

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AD7893BR-5 Summary of contents

Page 1

... IC (SOIC). REV. E 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 ...

Page 2

AD7893–SPECIFICATIONS A Parameter Versions DYNAMIC PERFORMANCE 2 Signal to (Noise + Distortion) Ratio @ + Total Harmonic Distortion (THD) –80 2 Peak Harmonic or Spurious Noise –80 2 Intermodulation Distortion (IMD) 2nd Order Terms –80 3rd Order ...

Page 3

TIMING CHARACTERISTICS A, B Parameter Versions 100 NOTES 1 Sample tested at + ensure compliance. All input signals are measured with ...

Page 4

... Positive supply voltage Model AD7893AN-2 AD7893BN-2 AD7893AR-2 AD7893BR-2 AD7893SQ-2 AD7893AN-5 AD7893BN-5 AD7893AR-5 AD7893BR-5 AD7893SQ-5 AD7893AN-10 – +85 C AD7893BN-10 – +85 C AD7893AR-10 – +85 C AD7893BR-10 – +85 C AD7893SQ-10 – +125 C AD7893AR Plastic DIP Cerdip SOIC. PIN FUNCTION DESCRIPTION 5%. ...

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

AD7893 CONVERTER DETAILS The AD7893 is a fast, 12-bit single supply A/D converter. It provides the user with signal scaling (AD7893-10), track/hold, A/D converter and serial interface logic functions on a single chip. The A/D converter section of the AD7893 ...

Page 7

Track/Hold Section The track/hold amplifier on the analog input of the AD7893 allows the ADC to accurately convert an input sine wave of full- scale amplitude to 12-bit accuracy. The input bandwidth of the track/hold is greater than the Nyquist ...

Page 8

AD7893 CONVST SCLK CONVERSION IS INITIATED AND TRACK/HOLD GOES INTO HOLD This scheme limits the throughput rate minimum; how- ever, depending on the response time of the microprocessor to the interrupt signal and the time taken by ...

Page 9

The AD7893 counts the serial clock edges to know which bit from the output register should be placed on the SDATA out- put. To ensure that the part does not lose synchronization, the serial clock counter is reset on the ...

Page 10

AD7893 AD7893–ADSP-2105 Interface An interface circuit between the AD7893 and the ADSP-2105 DSP processor is shown in Figure 8. In the interface shown, the RFS1 output from the ADSP-2105’s SPORT1 serial port is used to gate the serial clock (SCLK1) ...

Page 11

The same data is presented in Figure Figure 10 except that, in this case, the output data read for the device occurs dur- ing conversion. This has the effect of injecting noise onto the die while bit ...

Page 12

AD7893 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N- 0.280 (7.11) PIN 1 0.240 (6.10 0.325 (8.25) 0.430 (10.92) 0.300 (7.62) 0.348 (8.84) 0.060 (1.52) 0.210 0.015 (0.38) (5.33) MAX 0.130 0.015 (0.381) ...

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