ADC AD-95 Manuel d'utilisateur

4-Channel, 12-/10-/8-Bit ADC with I2C-Compatible Interface in 8-Lead SOT-23 AD7991/AD7995/AD7999 Rev. B Information furnished by Analog Devices is

AD7991/AD7995/AD7999 Rev. B | Page 10 of 28 Limit at tMIN, tMAX Parameter Conditions Min Typ Max Unit Description t10 Standard mode

AD7991/AD7995/AD7999 Rev. B | Page 11 of 28 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 6. Parameter Rating VDD to GND −0.3

AD7991/AD7995/AD7999 Rev. B | Page 12 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 06461-003SCL1SDA2VIN03VIN14VDD8GND7VIN3/VREF6VIN25AD7991/AD

AD7991/AD7995/AD7999 Rev. B | Page 13 of 28 TYPICAL PERFORMANCE CHARACTERISTICS DNL ERROR (LSB)CODE0 500 1000 1500 2000 2500 3000 3500 4000–1.0–0.8

AD7991/AD7995/AD7999 Rev. B | Page 14 of 28 DNL ERROR (LSB)CODE0 500 1000 1500 2000 2500 3000 3500 4000–1.0–0.8–0.6–0.4–0.200.20.40.60.81.006461-01

AD7991/AD7995/AD7999 Rev. B | Page 15 of 28 06461-032300SCL FREQUENCY (kHz)POWER (mW)500 1000 150021VDD = 5VVDD = 3V –120–100–80–60–40–2000 5 10 15

AD7991/AD7995/AD7999 Rev. B | Page 16 of 28 TERMINOLOGY Signal-to-Noise and Distortion (SINAD) Ratio The measured ratio of signal-to-noise and dist

AD7991/AD7995/AD7999 Rev. B | Page 17 of 28 THEORY OF OPERATION The AD7991/AD7995/AD7999 are low power, 12-/10-/8-bit, single-supply, 4-channel ADC

AD7991/AD7995/AD7999 Rev. B | Page 18 of 28 TYPICAL CONNECTION DIAGRAM Figure 22 shows the typical connection diagram for the AD7991/AD7995/AD7999.

AD7991/AD7995/AD7999 Rev. B | Page 19 of 28 For ac applications, removing high frequency components from the analog input signal is recommended by

AD7991/AD7995/AD7999 Rev. B | Page 2 of 28 TABLE OF CONTENTS Features ...

AD7991/AD7995/AD7999 Rev. B | Page 20 of 28 INTERNAL REGISTER STRUCTURE CONFIGURATION REGISTER The configuration register is an 8-bit write-only re

AD7991/AD7995/AD7999 Rev. B | Page 21 of 28 SAMPLE DELAY AND BIT TRIAL DELAY It is recommended that no I2C bus activity occur while a conversion is

AD7991/AD7995/AD7999 Rev. B | Page 22 of 28 SERIAL INTERFACE Control of the AD7991/AD7995/AD7999 is accomplished via the I2C-compatible serial bus.

AD7991/AD7995/AD7999 Rev. B | Page 23 of 28 WRITING TO THE AD7991/AD7995/AD7999 By default, each part operates in read-only mode and all four chan-

AD7991/AD7995/AD7999 Rev. B | Page 24 of 28 READING FROM THE AD7991/AD7995/AD7999 Reading data from the conversion result register is a 2-byte oper

AD7991/AD7995/AD7999 Rev. B | Page 25 of 28 PLACING THE AD7991/AD7995/AD7999 INTO HIGH SPEED MODE High speed mode communication commences after the

AD7991/AD7995/AD7999 Rev. B | Page 26 of 28 MODE OF OPERATION The AD7991/AD7995/AD7999 powers up in shutdown mode. After the master addresses the A

AD7991/AD7995/AD7999 Rev. B | Page 27 of 28 OUTLINE DIMENSIONS COMPLIANT TO JEDEC STANDARDS MO-178-BA121608-A8°4°0°SEATINGPLANE1.95BSC0.65 BSC0.60B

AD7991/AD7995/AD7999 Rev. B | Page 28 of 28 NOTES ©2007–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are

AD7991/AD7995/AD7999 Rev. B | Page 3 of 28 SPECIFICATIONS AD79911 The temperature range of the Y version is −40°C to +125°C. Unless otherwise noted

AD7991/AD7995/AD7999 Rev. B | Page 4 of 28 Y Version Parameter Min Typ Max Unit Test Conditions/Comments LOGIC INPUTS (SDA, SCL)

AD7991/AD7995/AD7999 Rev. B | Page 5 of 28 AD79951 The temperature range for the Y version is −40°C to +125°C. Unless otherwise noted, VDD = 2.7 V

AD7991/AD7995/AD7999 Rev. B | Page 6 of 28 A Version2 Y Version Parameter Min Typ Max Min Typ Max Unit Test Conditions/Comments LOGIC

AD7991/AD7995/AD7999 Rev. B | Page 7 of 28 AD79991 The temperature range for the Y version is −40°C to +125°C. Unless otherwise noted, VDD = 2.7 V

AD7991/AD7995/AD7999 Rev. B | Page 8 of 28 A Version2 Y Version Parameter Min Typ Max Min Typ Max Unit Test Conditions/Comments LOGIC INPU

AD7991/AD7995/AD7999 Rev. B | Page 9 of 28 I2C TIMING SPECIFICATIONS Guaranteed by initial characterization. All values were measured with the inpu