AD7871JP-REEL

AD7871JP-REEL Datasheet

AD7871/AD7872

Part	Datasheet
AD7871JP-REEL	AD7871JP-REEL (pdf)

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Data Sheet LC2MOS Complete 14-Bit, Sampling ADCs AD7871/AD7872 Complete monolithic 14-bit ADC Twos complement coding Parallel, byte, and serial digital interface 80 dB SNR at 10 kHz input frequency 57 ns data access time Low power 50 mW typ 83 kSPS throughput rate Digital signal processing High speed modems Speech recognition and synthesis Spectrum analysis DSP servo control The AD7871/AD7872 are fast, complete, 14-bit analog-todigital converters ADC . They consist of a track-and-hold amplifier, successive approximation ADC, 3 V buried Zener reference, and versatile interface logic. The ADC features a selfcontained, laser trimmed internal clock, so no external clock timing components are required. The on-chip clock may be overridden to synchronize ADC operation to the digital system for minimum noise. The AD7871 offers a choice of three data output formats a single, parallel, 14-bit word two 8-bit bytes or a 14-bit serial data stream. The AD7872 is a serial output device only. The two parts are capable of interfacing to all modern microprocessors and digital signal processors. The AD7871/AD7872 operate from ±5 V power supplies, accept bipolar input signals of ±3 V and can convert full power signals up to kHz. In addition to the traditional dc accuracy specifications, the AD7871/AD7872 are also fully specified for dynamic performance parameters including distortion and signal-tonoise ratio. 12889-001 FUNCTIONAL BLOCK DIAGRAMS AGND 22 CREF 23 REF OUT VIN VDD 21 TRACK- AND-HOLD 3V REFERENCE 14-BIT DAC COMP CLK 5 CLOCK 14/8/CLK 28 CONVST 1 CONTROL LOGIC SAR + COUNTER PARALLEL AND SERIAL INTERFACE AD7871 CS RD BUSY/INT DB13 DB0 DGND VSS Figure AGND 12 CREF 11 REF OUT VIN TRACKAND-HOLD 3V REFERENCE 14-BIT DAC COMP CLK 3 CONTROL 1 CONVST 2 CLOCK CONTROL LOGIC Data Sheet Unipolar Offset And Full-Scale Adjustment 10 Timing and Control 11 Data Output 11 Mode 1 12 Mode 2 13 Dynamic Specifications 14 Microprocessor Interface 15 StandAlone 16 Application 17 Layout 17 Noise 17 Data Acquisition Board 17 Interface Connections 18 Power Supply Connections 18 Shorting Plug Options 18 Outline Dimensions 21 Ordering Guide 24 Data Sheet AD7871/AD7872 SPECIFICATIONS VDD = +5 V ± 5%, VSS = −5 V ± 5%, AGND = DGND = 0 V, fCLK = 2 MHz external, fSAMPLE = 83 kHz, all specifications TMIN to TMAX unless otherwise noted. Table Parameter DYNAMIC PERFORMANCE2 Signal-to-Noise Ratio3 SNR at +25°C TMIN to TMAX Total Harmonic Distortion THD J, A Versions1 80 −86 Peak Harmonic or Spurious Noise −86 Intermodulation Distortion IMD Second-Order Terms −86 Third-Order Terms −86 Track/Hold Acquisition Time DC ACCURACY Resolution Minimum Resolution for Which No Missing Codes Are Guaranteed Integral Nonlinearity at +25°C Integral Nonlinearity Bipolar Zero Error Positive Gain Error4 Negative Gain Error4 ANALOG INPUT Voltage Range Input Current REFERENCE OUTPUT REF OUT at +25°C ±12 ±12 ±12 ±3 ±500 TMIN to TMAX REF OUT Tempco Reference Load Sensitivity LOGIC INPUTS Input High Voltage, VINH Input Low Voltage, VINL Input Current, IIN ±10 Input Current 14/8/CLK Input ±10 Only Input Capacitance, CIN5 Version1 −88 −85 −88 −85 −88 −85 −88 −85 ±12 ±12 ±12 ORDERING GUIDE Model1, 2, 3, 4 AD7871JN AD7871JNZ AD7871JP-REEL AD7871JPZ-REEL AD7871KNZ AD7871KPZ AD7871TQ AD7872AN AD7872ANZ AD7872BR AD7872BRZ-REEL AD7872JNZ AD7872JRZ-REEL AD7872KNZ AD7872KRZ-REEL AD7872TQ Temperature Range 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C to +125°C to +85°C to +85°C to +85°C to +85°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C to +125°C Package Description 28-Lead PDIP 28-Lead PDIP 28-Lead PLCC 28-Lead PLCC 28-Lead PLCC 28-Lead PDIP 28-Lead PLCC 28-Lead CERDIP 16-Lead PDIP 16-Lead PDIP 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead PDIP 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead PDIP 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead CERDIP 1 Z = RoHS Compliant Part. 2 To order MIL-STD-883, Class B, processed parts, add /883B to part number. Contact local sales office for military data sheet. 3 Contact local sales office for LCCC availability. 4 The AD787xTQ models are available to /883B processing only. Data Sheet Package Option N-28-3 N-28-3 P-28 P-28 P-28 N-28-3 P-28 Q-28-2 N-16 N-16 RW-16 RW-16 RW-16 N-16 RW-16 RW-16 N-16 RW-16 RW-16 Q-16 2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D12889-0-1/15 E

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Data Sheet

LC2MOS Complete 14-Bit, Sampling ADCs

AD7871/AD7872

Complete monolithic 14-bit ADC Twos complement coding Parallel, byte, and serial digital interface 80 dB SNR at 10 kHz input frequency 57 ns data access time Low power 50 mW typ 83 kSPS throughput rate

Digital signal processing High speed modems Speech recognition and synthesis Spectrum analysis DSP servo control

The AD7871/AD7872 are fast, complete, 14-bit analog-todigital converters ADC . They consist of a track-and-hold amplifier, successive approximation ADC, 3 V buried Zener reference, and versatile interface logic. The ADC features a selfcontained, laser trimmed internal clock, so no external clock timing components are required. The on-chip clock may be overridden to synchronize ADC operation to the digital system for minimum noise.

The AD7871 offers a choice of three data output formats a single, parallel, 14-bit word two 8-bit bytes or a 14-bit serial data stream. The AD7872 is a serial output device only. The two parts are capable of interfacing to all modern microprocessors and digital signal processors.

The AD7871/AD7872 operate from ±5 V power supplies, accept bipolar input signals of ±3 V and can convert full power signals up to kHz.

In addition to the traditional dc accuracy specifications, the AD7871/AD7872 are also fully specified for dynamic performance parameters including distortion and signal-tonoise ratio.
12889-001

FUNCTIONAL BLOCK DIAGRAMS

AGND 22

CREF 23

REF OUT VIN

VDD 21

TRACK-

AND-HOLD
3V REFERENCE
14-BIT DAC

COMP

CLK 5

CLOCK
14/8/CLK 28 CONVST 1

CONTROL LOGIC

SAR + COUNTER

PARALLEL AND SERIAL INTERFACE

AD7871

CS RD BUSY/INT

DB13 DB0 DGND VSS

Figure

AGND 12

CREF 11

REF OUT VIN

TRACKAND-HOLD
3V REFERENCE
14-BIT DAC

COMP

CLK 3

CONTROL 1 CONVST 2

CLOCK

CONTROL LOGIC
Data Sheet
Unipolar Offset And Full-Scale Adjustment 10 Timing and Control 11 Data Output 11 Mode 1 12 Mode 2 13 Dynamic Specifications 14 Microprocessor Interface 15 StandAlone 16 Application 17 Layout 17 Noise 17 Data Acquisition Board 17 Interface Connections 18 Power Supply Connections 18 Shorting Plug Options 18 Outline Dimensions 21 Ordering Guide 24

Data Sheet

AD7871/AD7872

SPECIFICATIONS

VDD = +5 V ± 5%, VSS = −5 V ± 5%, AGND = DGND = 0 V, fCLK = 2 MHz external, fSAMPLE = 83 kHz, all specifications TMIN to TMAX unless otherwise noted.

Table

Parameter DYNAMIC PERFORMANCE2

Signal-to-Noise Ratio3 SNR at +25°C

TMIN to TMAX Total Harmonic Distortion THD

J, A Versions1
80 −86

Peak Harmonic or Spurious Noise −86

Intermodulation Distortion IMD

Second-Order Terms
−86

Third-Order Terms
−86

Track/Hold Acquisition Time DC ACCURACY

Resolution Minimum Resolution for Which No Missing Codes Are Guaranteed Integral Nonlinearity at +25°C Integral Nonlinearity Bipolar Zero Error Positive Gain Error4 Negative Gain Error4 ANALOG INPUT Voltage Range Input Current REFERENCE OUTPUT REF OUT at +25°C
±12 ±12 ±12 ±3 ±500

TMIN to TMAX

REF OUT Tempco

Reference Load Sensitivity

LOGIC INPUTS

Input High Voltage, VINH

Input Low Voltage, VINL

Input Current, IIN
±10

Input Current 14/8/CLK Input ±10

Only

Input Capacitance, CIN5

Version1
−88
−85 −88
−85
−88
−85 −88
−85
±12
±12
±12
ORDERING GUIDE

Model1, 2, 3, 4 AD7871JN AD7871JNZ AD7871JP-REEL AD7871JPZ-REEL AD7871KNZ AD7871KPZ AD7871TQ AD7872AN AD7872ANZ AD7872BR AD7872BRZ-REEL AD7872JNZ AD7872JRZ-REEL AD7872KNZ AD7872KRZ-REEL AD7872TQ

Temperature Range 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C to +125°C to +85°C to +85°C to +85°C to +85°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C to +125°C

Package Description 28-Lead PDIP 28-Lead PDIP 28-Lead PLCC 28-Lead PLCC 28-Lead PLCC 28-Lead PDIP 28-Lead PLCC 28-Lead CERDIP 16-Lead PDIP 16-Lead PDIP 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead PDIP 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead PDIP 16-Lead SOIC_W 16-Lead SOIC_W 16-Lead CERDIP
1 Z = RoHS Compliant Part. 2 To order MIL-STD-883, Class B, processed parts, add /883B to part number. Contact local sales office for military data sheet. 3 Contact local sales office for LCCC availability. 4 The AD787xTQ models are available to /883B processing only.

Data Sheet

Package Option N-28-3 N-28-3 P-28 P-28 P-28 N-28-3 P-28 Q-28-2 N-16 N-16 RW-16 RW-16 RW-16 N-16 RW-16 RW-16 N-16 RW-16 RW-16 Q-16
2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

D12889-0-1/15 E

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Datasheet ID: AD7871JP-REEL 517743