AD7171 Analog Devices, AD7171 Datasheet
AD7171
Specifications of AD7171
Available stocks
Related parts for AD7171
AD7171 Summary of contents
Page 1
... The AD7171 operates with a power supply from 2 5. available in a 10-lead LFCSP package. The AD7170 is a 12-bit version of the AD7171. It has the same feature set as the AD7171 and is pin-for-pin compatible. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. ...
Page 2
... AD7171 TABLE OF CONTENTS Features .............................................................................................. 1 Interface ............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Characteristics ..................................................................... 5 Timing Diagrams .......................................................................... 5 Absolute Maximum Ratings ............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution .................................................................................. 6 Pin Configuration and Function Descriptions ............................. 7 Typical Performance Characteristics ............................................. 8 Output Noise and Resolution Specifications ................................ 9 ADC Circuit Information .............................................................. 10 REVISION HISTORY 10/09— ...
Page 3
... GND − 0. 0.03 DD 400 ±0.15 110 64 − 0.4 0.8 1.8 2.4 100 140 ±2 5 Rev Page AD7171 Unit Test Conditions/Comments Hz Settling time = 3/f ADC Bits Bits INx REF DD Bits INx REF DD μ INx REF ...
Page 4
... Power Supply Currents I Current DD I (Power-Down/Reset Mode Temperature range is –40°C to +105°C. 2 Specification is not production tested but is supported by characterization data at initial product release. 3 Digital inputs equal GND AD7171B Min Typ Max V − 0 0.4 0.4 ±2 5 Offset binary 2.7 5.25 110 ...
Page 5
... I = INPUT OUTPUT Figure 3. Read Cycle Timing Diagram PDRST ( DOUT/RDY ( INPUT OUTPUT Figure 4. Resetting the AD7171 Rev Page (10 and timed from a voltage level of 1 limits 5V, ...
Page 6
... AD7171 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V to GND DD Analog Input Voltage to GND Reference Input Voltage to GND Digital Input Voltage to GND Digital Output Voltage to GND V /Digital Input Current INx Operating Temperature Range Storage Temperature Range Maximum Junction Temperature ...
Page 7
... Connect the exposed pad to ground. SCLK AD7171 DOUT/RDY 2 9 PDRST AIN(+) 3 TOP VIEW (Not to Scale) AIN(– GND REFIN(+) 5 6 REFIN(–) NOTES CONNECT. 2. CONNECT EXPOSED PAD TO GROUND. Figure 5. Pin Configuration Rev Page AD7171 Figure 13 for further details ...
Page 8
... REF REF –40 – TEMPERATURE (°C) Figure 6. AD7171 RMS Noise vs. Temperature 0.266 0.200 0.133 0.066 0 –0.066 –0.133 –0.200 –3 –2 – (V) IN Figure 7. Integral Nonlinearity (V 180 160 140 120 –40 – ...
Page 9
... OUTPUT NOISE AND RESOLUTION SPECIFICATIONS Table 6 shows the rms noise of the AD7171. The numbers given are for and reference. These numbers are typical and are generated with a differential input voltage The corres- ponding p-p resolution is also listed along with the effective resolution (ENOB) ...
Page 10
... This resets the logic, the digital filter, and the analog modulator. PDRST must be held low for 100 ns minimum to initiate the reset function (see When PDRST is taken high, the AD7171 is taken out of power- down mode. When the on-chip clock has powered up (1 ms, typically), the modulator then begins sampling the analog input. ...
Page 11
... An error occurs when the analog input is outside range. ID1, ID0: ID bits. These bits indicate the ID number for the AD7171. Bit ID1 is set to 0 and bit ID0 is set to 1 for the AD7171. PAT2, PAT1, PAT0: status pattern bits. They are set to 101 by DD default ...
Page 12
... The ground plane of the AD7171 should be allowed to run under the AD7171 to prevent noise coupling. The power supply lines to the AD7171 should use as wide a trace as possible to provide low impedance paths and reduce the effects of glitches on the power supply line. Fast switching signals such as clocks ...
Page 13
... REFIN(–) Figure 13. Temperature System Using the AD7171 SIGNAL CONDITIONING CIRCUIT Figure 14 shows the AD7171 used in a signal conditioning circuit for a single-ended analog input low side shunt current monitor, a low resistance shunt resistor converts the current to voltage. The resulting voltage is amplified and applied to the AD7171. 1kΩ ...
Page 14
... AD7171 OUTLINE DIMENSIONS PIN 1 INDEX AREA 0.80 0.75 0.70 SEATING PLANE ORDERING GUIDE Temperature Model Range 1 AD7171BCPZ-REEL7 –40°C to +105°C 1 AD7171BCPZ-500RL7 –40°C to +105° RoHS Compliant Part. 0.30 3.00 0.23 BSC SQ 0. EXPOSED (BOTTOM VIEW) 0.50 0.40 5 0.30 TOP VIEW 0.80 MAX 0.55 NOM 0.05 MAX 0.02 NOM 0.20 REF * FOR PROPER CONNECTION OF THE EXPOSED PAD PLEASE REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET ...
Page 15
... NOTES Rev Page AD7171 ...
Page 16
... AD7171 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08417-0-10/09(0) Rev Page ...