AD7893BR-10REEL7

AD7893BR-10REEL7 Datasheet

V for AD7893-10 V for AD7893-3 0 V to V for AD7893-2 0 V to +5 V for AD7893-5 Low Power 25 mW typ

Part	Datasheet
AD7893BR-10REEL7	AD7893BR-10REEL7 (pdf)

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FEATURES Fast 12-Bit ADC with 6 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 V for AD7893-10 V for AD7893-3 0 V to V for AD7893-2 0 V to +5 V for AD7893-5 Low Power 25 mW typ LC2MOS 12-Bit, Serial 6 ADC in 8-Pin Package AD7893 FUNCTIONAL BLOCK DIAGRAM REF IN AD7893 TRACK/ SIGNAL SCALING* HOLD 12-BIT ADC CONVST OUTPUT REGISTER AGND DGND AD7893-5, AD7893-10, AD7893-3 SCLK SDATA 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 µs 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 linearity, full-scale and offset errors, the AD7893 is also specified for dynamic performance parameters, including harmonic distortion and signal-to-noise ratio. The part accepts an analog input range of ± 10 V AD7893-10 , ± V AD7893-3 , 0 V to +5 V AD7893-5 or 0 V to V AD7893-2 and operates from a single +5 V supply, consuming only 25 mW typical. The AD7893 is fabricated in Analog Devices’ Linear Compatible CMOS LC2MOS process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a small, 8-pin, wide, plastic or hermetic dual-in-line package mini-DIP and in an 8-pin, small outline IC SOIC . PRODUCT HIGHLIGHTS Fast, 12-Bit ADC in 8-Pin Package The AD7893 contains a 6 µs 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 alternative solutions. Low Power, Single Supply Operation The AD7893 operates from a single +5 V supply and consumes only 25 mW. This low power, single supply operation makes it ideal for battery powered or portable applications. High Speed Serial Interface The part provides high speed serial data and serial clock lines, allowing for an easy, two-wire serial interface arrangement. 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel 617/329-4700 World Wide Web Site: Fax 617/326-8703 Analog Devices, Inc., 1997 AD7893 Product Page Quick Links Last Content Update 08/30/2016 Comparable Parts View a parametric search of comparable parts Documentation Application Notes • AN-381 Obtaining the Best Performance from the AD7893, 12-Bit Serial A/D Converter Data Sheet • AD7893 Military Data Sheet • AD7893 12-Bit, Serial 6µs ADC in 8-Pin Package Data Sheet Product Highlight • 8- to 18-Bit SAR ADCs From the Leader in High Performance Analog Reference Materials Analog Dialogue • Interfacing to Serial Converters • Low-Power, Low-Voltage IC Choices for ECG System Requirements Technical Articles • MS-2210 Designing Power Supplies for High Speed ADC ORDERING GUIDE Model Temperature Range Linearity Package Error SNR Options* AD7893AN-2 AD7893BN-2 AD7893AR-2 AD7893BR-2 AD7893SQ-2 to +85°C to +85°C to +85°C to +85°C to +125°C ± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB 70 dB 72 dB 70 dB 72 dB 70 dB N-8 N-8 SO-8 SO-8 Q-8 AD7893AN-5 AD7893BN-5 AD7893AR-5 AD7893BR-5 AD7893SQ-5 to +85°C to +85°C to +85°C to +85°C to +125°C ± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB 70 dB 72 dB 70 dB 72 dB 70 dB N-8 N-8 SO-8 SO-8 Q-8 AD7893AN-10 AD7893BN-10 AD7893AR-10 AD7893BR-10 AD7893SQ-10 to +85°C to +85°C to +85°C to +85°C to +125°C ± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB 70 dB 72 dB 70 dB 72 dB 70 dB N-8 N-8 SO-8 SO-8 Q-8 AD7893AR-3 to +85°C ± 1 LSB 70 dB SO-8 *N = Plastic DIP, Q = Cerdip, SO = SOIC. AD7893 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 all nonfundamental signals up to half the sampling frequency fS/2 , excluding dc. The ratio is dependent upon the number of quantization levels in the digitization process the more levels, the smaller the quantization noise. The theoretical signal to noise + distortion ratio for an ideal N-bit converter with a sine wave input is given by: Signal to Noise + Distortion = N + dB Thus for a 12-bit converter, this is 74 dB. Total Harmonic Distortion Total harmonic distortion THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7893, it is defined as: THD dB = 20 log where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5 and V6 are the rms amplitudes of the second through the sixth harmonics. Peak Harmonic or Spurious Noise Peak harmonic or spurious noise is defined as the ratio of the rms value of the next largest component in the ADC output spectrum up to fS/2 and excluding dc to the rms value of the fundamental. Normally, the value of this specification is determined by the largest harmonic in the spectrum, but for parts where the harmonics are buried in the noise floor, it will be a noise peak. Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products at sum and difference frequencies of mfa ± nfb where m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for which neither m nor n are equal to zero. For example, the second order terms include fa + fb and fa fb , while the third order terms include 2 fa + fb , 2 fa fb , fa + 2 fb and fa 2 fb . The AD7893 is tested using the CCIF standard where two input frequencies near the top end of the input bandwidth are used. In this case, the second and third order terms are of different significance. The second order terms are usually distanced in frequency from the original sine waves, while the third order terms are usually at a frequency close to the input frequencies. As a result, the second and third order terms are specified separately. The calculation of the intermodulation distortion is per the THD specification where it is the ratio of the rms sum of the individual distortion products to the rms amplitude of the fundamental expressed in dBs. Relative Accuracy Relative accuracy or endpoint nonlinearity is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Positive Full-Scale Error AD7893-10 This is the deviation of the last code transition 01 110 to 01 111 from the ideal 4 x REF IN 1 LSB AD7893-10 ±10 V range after the Bipolar Zero Error has been adjusted out. Positive Full-Scale Error AD7893-3 This is the deviation of the last code transition 01 110 to 01 111 from the ideal REF IN 1 LSB after the Bipolar Zero Error has been adjusted out. Positive Full-Scale Error AD7893-5 This is the deviation of the last code transition 11 110 to 11 111 from the ideal 2 x REF IN 1 LSB after the Unipolar Offset Error has been adjusted out. Positive Full-Scale Error AD7893-2 This is the deviation of the last code transition 11 110 to 11 111 from the ideal REF IN 1 LSB after the Unipolar Offset Error has been adjusted out. Bipolar Zero Error AD7893-10, V AD7893-3, V This is the deviation of the midscale transition all 0s to all 1s from the ideal 0 V AGND . Unipolar Offset Error AD7893-2, AD7893-5 This is the deviation of the first code transition 00 000 to 00 001 from the ideal 1 LSB.

PDF Datasheet Preview

FEATURES Fast 12-Bit ADC with 6 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

V for AD7893-10 V for AD7893-3 0 V to V for AD7893-2 0 V to +5 V for AD7893-5 Low Power 25 mW typ

LC2MOS 12-Bit, Serial 6 ADC in 8-Pin Package

AD7893

FUNCTIONAL BLOCK DIAGRAM

REF IN

AD7893

TRACK/

SIGNAL SCALING*

HOLD
12-BIT ADC

CONVST

OUTPUT REGISTER

AGND DGND *AD7893-5, AD7893-10, AD7893-3

SCLK SDATA

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 µs 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 linearity, full-scale and offset errors, the AD7893 is also specified for dynamic performance parameters, including harmonic distortion and signal-to-noise ratio.

The part accepts an analog input range of ± 10 V AD7893-10 , ± V AD7893-3 , 0 V to +5 V AD7893-5 or 0 V to V AD7893-2 and operates from a single +5 V supply, consuming only 25 mW typical.

The AD7893 is fabricated in Analog Devices’ Linear Compatible CMOS LC2MOS process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a small, 8-pin, wide, plastic or hermetic dual-in-line package mini-DIP and in an 8-pin, small outline IC SOIC .

PRODUCT HIGHLIGHTS Fast, 12-Bit ADC in 8-Pin Package

The AD7893 contains a 6 µs 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 alternative solutions.

Low Power, Single Supply Operation The AD7893 operates from a single +5 V supply and consumes only 25 mW. This low power, single supply operation makes it ideal for battery powered or portable applications.

High Speed Serial Interface The part provides high speed serial data and serial clock lines, allowing for an easy, two-wire serial interface arrangement.

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.

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

Tel 617/329-4700 World Wide Web Site:

Fax 617/326-8703

Analog Devices, Inc., 1997

AD7893* Product Page Quick Links

Last Content Update 08/30/2016

Comparable Parts

View a parametric search of comparable parts

Documentation

Application Notes
• AN-381 Obtaining the Best Performance from the

AD7893, 12-Bit Serial A/D Converter Data Sheet
• AD7893 Military Data Sheet
• AD7893 12-Bit, Serial 6µs ADC in 8-Pin Package Data

Sheet Product Highlight
• 8- to 18-Bit SAR ADCs From the Leader in High

Performance Analog

Reference Materials

Analog Dialogue
• Interfacing to Serial Converters
• Low-Power, Low-Voltage IC Choices for ECG System

Requirements Technical Articles
• MS-2210 Designing Power Supplies for High Speed ADC
ORDERING GUIDE

Model

Temperature Range

Linearity

Package

Error SNR Options*

AD7893AN-2 AD7893BN-2 AD7893AR-2 AD7893BR-2 AD7893SQ-2
to +85°C to +85°C to +85°C to +85°C to +125°C
± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB
70 dB 72 dB 70 dB 72 dB 70 dB

N-8 N-8 SO-8 SO-8 Q-8

AD7893AN-5 AD7893BN-5 AD7893AR-5 AD7893BR-5 AD7893SQ-5
to +85°C to +85°C to +85°C to +85°C to +125°C
± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB
70 dB 72 dB 70 dB 72 dB 70 dB

N-8 N-8 SO-8 SO-8 Q-8

AD7893AN-10 AD7893BN-10 AD7893AR-10 AD7893BR-10 AD7893SQ-10
to +85°C to +85°C to +85°C to +85°C to +125°C
± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB
70 dB 72 dB 70 dB 72 dB 70 dB

N-8 N-8 SO-8 SO-8 Q-8

AD7893AR-3 to +85°C ± 1 LSB 70 dB SO-8
*N = Plastic DIP, Q = Cerdip, SO = SOIC.

AD7893

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 all nonfundamental signals up to half the sampling frequency fS/2 , excluding dc. The ratio is dependent upon the number of quantization levels in the digitization process the more levels, the smaller the quantization noise. The theoretical signal to noise + distortion ratio for an ideal N-bit converter with a sine wave input is given by:

Signal to Noise + Distortion = N + dB

Thus for a 12-bit converter, this is 74 dB.

Total Harmonic Distortion Total harmonic distortion THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7893, it is defined as:

THD dB = 20 log
where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5 and V6 are the rms amplitudes of the second through the sixth harmonics.

Peak Harmonic or Spurious Noise Peak harmonic or spurious noise is defined as the ratio of the rms value of the next largest component in the ADC output spectrum up to fS/2 and excluding dc to the rms value of the fundamental. Normally, the value of this specification is determined by the largest harmonic in the spectrum, but for parts where the harmonics are buried in the noise floor, it will be a noise peak.

Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products at sum and difference frequencies of mfa ± nfb where m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for which neither m nor n are equal to zero. For example, the second order terms include fa + fb and fa fb , while the third order terms include 2 fa + fb , 2 fa fb , fa + 2 fb and fa 2 fb .

The AD7893 is tested using the CCIF standard where two input frequencies near the top end of the input bandwidth are used. In this case, the second and third order terms are of different significance. The second order terms are usually distanced in frequency from the original sine waves, while the third order terms are usually at a frequency close to the input frequencies. As a result, the second and third order terms are specified separately. The calculation of the intermodulation distortion is per the THD specification where it is the ratio of the rms sum of the individual distortion products to the rms amplitude of the fundamental expressed in dBs.

Relative Accuracy Relative accuracy or endpoint nonlinearity is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function.

Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC.

Positive Full-Scale Error AD7893-10 This is the deviation of the last code transition 01 110 to 01 111 from the ideal 4 x REF IN 1 LSB AD7893-10 ±10 V range after the Bipolar Zero Error has been adjusted out.

Positive Full-Scale Error AD7893-3 This is the deviation of the last code transition 01 110 to 01 111 from the ideal REF IN 1 LSB after the Bipolar Zero Error has been adjusted out.

Positive Full-Scale Error AD7893-5 This is the deviation of the last code transition 11 110 to 11 111 from the ideal 2 x REF IN 1 LSB after the Unipolar Offset Error has been adjusted out.

Positive Full-Scale Error AD7893-2 This is the deviation of the last code transition 11 110 to 11 111 from the ideal REF IN 1 LSB after the Unipolar Offset Error has been adjusted out.

Bipolar Zero Error AD7893-10, V AD7893-3, V This is the deviation of the midscale transition all 0s to all 1s from the ideal 0 V AGND .

Unipolar Offset Error AD7893-2, AD7893-5 This is the deviation of the first code transition 00 000 to 00 001 from the ideal 1 LSB.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AD7893BR-10REEL7 Datasheet file may be downloaded here without warranties.

Datasheet ID: AD7893BR-10REEL7 517744