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AD7851

14-Bit 333 kSPS Serial A/D Converter

Analog Devices 

AD7851

ABSOLUTE MAXIMUM RATINGS1

(TA = 25°C, unless otherwise noted.)

AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V

DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V

AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V

Analog Input Voltage to AGND . . . . . –0.3 V to AVDD + 0.3 V

Digital Input Voltage to DGND . . . . –0.3 V to DVDD + 0.3 V

Digital Output Voltage to DGND . . . –0.3 V to DVDD + 0.3 V

REFIN/REFOUT to AGND . . . . . . . . . . –0.3 V to AVDD + 0.3 V

Input Current to Any Pin Except Supplies2 . . . . . . . . . ± 10 mA

Operating Temperature Range

Commercial (A, K Versions) . . . . . . . . . . . –40°C to +125°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C

PDIP Package, Power Dissipation . . . . . . . . . . . . . . . . 450 mW

θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 105°C/W

θJC Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 34.7°C/W

Lead Temperature, (Soldering, 10 secs) . . . . . . . . . . 260°C

SOIC, SSOP Package, Power Dissipation . . . . . . . . . 450 mW

θJA Thermal Impedance . . 75°C/W (SOIC), 122.28°C/W (SSOP)

θJC Thermal Impedance . . . 25°C/W (SOIC), 31.25°C/W (SSOP)

Lead Temperature, Soldering

Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . 215°C

Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C

ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >1.5 kV

NOTES

1Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those listed in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

2Transient currents of up to 100 mA will not cause SCR latch-up.

PINOUT FOR DIP, SOIC, AND SSOP

CONVST 1

24 SYNC

BUSY 2

SLEEP 3

23 SCLK

22 CLKIN

REFIN/REFOUT 4

AVDD 5

AGND 6

CREF1 7

CREF2 8

AIN(+) 9

21 DIN

AD7851

TOP VIEW

(Not to Scale)

20 DOUT

19 DGND

18 DVDD

17 CAL

16 SM2

AIN(–) 10

15 SM1

NC 11

14 POLARITY

AGND 12

13 AMODE

ORDERING GUIDE1

NC = NO CONNECT

Model

Temperature

Range

Linearity

Error Throughput

(LSB)2 Rate (kSPS)

Throughput

at 125؇C (kSPS) Description

Package

Options3

AD7851AN

–40°C to +85°C ± 2

333

238

AD7851KN

0°C to 85°C

±1

285

238

AD7851AR

–40°C to +85°C ± 2

333

238

AD7851AR-REEL

–40°C to +85°C ± 2

333

238

AD7851ARZ3

–40°C to +85°C ± 2

333

238

AD7851ARZ-REEL3

–40°C to +85°C ± 2

333

238

AD7851KR

0°C to 85°C

±1

285

238

AD7851KR-REEL

0°C to 85°C

±1

285

238

AD7851KRZ3

0°C to 85°C

±1

285

238

AD7851KRZ-REEL3

0°C to 85°C

±1

285

238

AD7851ARS

–40°C to +85°C ± 2

333

238

AD7851ARS-REEL

–40°C to +85°C ± 2

333

238

EVAL-AD7851CB4

EVAL-CONTROL BRD25

PDIP

PDIP

SOIC

SOIC

SOIC

SOIC

SOIC

SOIC

SOIC

SOIC

SSOP

SSOP

Evaluation Board

Controller Board

N-24

N-24

R-24

R-24

R-24

R-24

R-24

R-24

R-24

R-24

RS-24

RS-24

NOTES

1Both A and K Grades are guaranteed up to 125°C, but at a lower throughput of 238 kHz (5 MHz).

2Linearity error refers to the integral linearity error.

3Z = Pb-free part.

4This can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BOARD for evaluation/demonstration purposes.

5This board is a complete unit allowing a PC to control and communicate with all Analog Devices, Inc. evaluation boards ending in the CB designators. To order a

complete evaluation kit, the particular ADC evaluation board needs to be ordered, e.g., EVAL-AD7851CB, the EVAL-CONTROL BRD2, and a 12 V ac trans-

former. See the Evaluation Board application note for more information.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although the

AD7851 features proprietary ESD protection circuitry, permanent damage may occur on devices

subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended

to avoid performance degradation or loss of functionality.

REV. B

–7–

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