Datasheet AD7851 (Analog Devices) - 8

AD7851 ABSOLUTE MAXIMUM RATINGS1
Lead Temperature, Soldering (TA = 25°C, unless otherwise noted.) Vapor Phase (60 secs) . 215°C AV Infrared (15 secs) . 220°C DD to AGND . –0.3 V to +7 V DV ESD . >1.5 kV DD to DGND . –0.3 V to +7 V AV NOTES DD to DVDD . –0.3 V to +0.3 V 1 Analog Input Voltage to AGND . –0.3 V to AV Stresses above those listed under Absolute Maximum Ratings may cause perma- DD + 0.3 V nent damage to the device. This is a stress rating only; functional operation of the Digital Input Voltage to DGND . –0.3 V to DVDD + 0.3 V device at these or any other conditions above those listed in the operational Digital Output Voltage to DGND . –0.3 V to DVDD + 0.3 V sections of this specification is not implied. Exposure to absolute maximum rating REFIN/REFOUT to AGND . –0.3 V to AVDD + 0.3 V conditions for extended periods may affect device reliability. Input Current to Any Pin Except Supplies2 . ± 10 mA 2Transient currents of up to 100 mA will not cause SCR latch-up. Operating Temperature Range
PINOUT FOR DIP, SOIC, AND SSOP
Commercial (A, K Versions) . –40°C to +125°C Storage Temperature Range . –65°C to +150°C Junction Temperature . 150°C
CONVST 1 24 SYNC
PDIP Package, Power Dissipation . 450 mW
BUSY 2 23 SCLK
θJA Thermal Impedance . 105°C/W
SLEEP 3 22 CLKIN
θJC Thermal Impedance . .34.7°C/W
REF 4 21 DIN IN/REFOUT
Lead Temperature, (Soldering, 10 secs) . 260°C
AV 5 20 DD AD7851 DOUT
SOIC, SSOP Package, Power Dissipation . 450 mW
AGND 6 TOP VIEW 19 DGND
θ
(Not to Scale)
JA Thermal Impedance . 75°C/W (SOIC), 122.28°C/W (SSOP)
C 7 18 DV
θ
REF1 DD
JC Thermal Impedance . 25°C/W (SOIC), 31.25°C/W (SSOP)
C 8 17 CAL REF2 AIN(+) 9 16 SM2 AIN(–) 10 15 SM1 NC 11 14 POLARITY AGND 12 13 AMODE NC = NO CONNECT ORDERING GUIDE1 Linearity Temperature Error Throughput Throughput Package Model Range (LSB)2 Rate (kSPS) at 125
ⴗ
C (kSPS) Description Options3
AD7851AN –40°C to +85°C ±2 333 238 PDIP N-24 AD7851KN 0°C to 85°C ±1 285 238 PDIP N-24 AD7851AR –40°C to +85°C ±2 333 238 SOIC R-24 AD7851AR-REEL –40°C to +85°C ±2 333 238 SOIC R-24 AD7851ARZ3 –40°C to +85°C ±2 333 238 SOIC R-24 AD7851ARZ-REEL3 –40°C to +85°C ±2 333 238 SOIC R-24 AD7851KR 0°C to 85°C ±1 285 238 SOIC R-24 AD7851KR-REEL 0°C to 85°C ±1 285 238 SOIC R-24 AD7851KRZ3 0°C to 85°C ±1 285 238 SOIC R-24 AD7851KRZ-REEL3 0°C to 85°C ±1 285 238 SOIC R-24 AD7851ARS –40°C to +85°C ±2 333 238 SSOP RS-24 AD7851ARS-REEL –40°C to +85°C ±2 333 238 SSOP RS-24 EVAL-AD7851CB4 Evaluation Board EVAL-CONTROL BRD25 Controller Board 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– Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS SPECIFICATIONS TIMING SPECIFICATIONS TYPICAL TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS PINOUT FOR DIP, SOIC, AND SSOP ORDERING GUIDE TERMINOLOGY Integral Nonlinearity Differential Nonlinearity Total Unadjusted Error Unipolar Offset Error Positive Full-Scale Error Negative Full-Scale Error Bipolar Zero Error Track-and-Hold Acquisition Time Signal-to-(Noise + Distortion) Ratio Total Harmonic Distortion Peak Harmonic or Spurious Noise Intermodulation Distortion Power Supply Rejection Ratio (PSRR) Full Power Bandwidth (FPBW) PIN FUNCTION DESCRIPTIONS AD7851 ON-CHIP REGISTERS Addressing the On-Chip Registers Writing Reading CONTROL REGISTER STATUS REGISTER CALIBRATION REGISTERS Addressing the Calibration Registers Writing to/Reading from the Calibration Registers Adjusting the Offset Calibration Register Adjusting the Gain Calibration Register CIRCUIT INFORMATION CONVERTER DETAILS TYPICAL CONNECTION DIAGRAM ANALOG INPUT Acquisition Time DC/AC Applications Input Ranges Transfer Functions REFERENCE SECTION AD7851 PERFORMANCE CURVES POWER-DOWN OPTIONS POWER-UP TIMES Using an External Reference Using the Internal (On-Chip) Reference POWER VS. THROUGHPUT RATE CALIBRATION SECTION Calibration Overview Automatic Calibration on Power-On Self-Calibration Description Self-Calibration Timing System Calibration Description System Gain and Offset Interaction System Calibration Timing SERIAL INTERFACE SUMMARY Resetting the Serial Interface DETAILED TIMING SECTION Mode 1 (2-Wire 8051 Interface) Mode 2 (3-Wire SPI/QSPI Interface Mode) Mode 3 (QSPI Interface Mode) MODE 4 and 5 (Self-Clocking Modes) CONFIGURING THE AD7851 AD7851 as a Read-Only ADC Writing to the AD7851 Interface Modes 2 and 3 Configuration Interface Mode 1 Configuration Interface Modes 4 and 5 Configuration MICROPROCESSOR INTERFACING AD7851 to 8XC51/PIC17C42 Interface AD7851 to 68HC11/16/L11/PIC16C42 Interface AD7851 to ADSP-21xx Interface AD7851 to DSP56000/1/2/L002 Interface AD7851 to TMS320C20/25/5x/LC5x Interface APPLICATION HINTS Grounding and Layout Evaluating the AD7851 Performance AD785x Family OUTLINE DIMENSIONS Revision History