Datasheet AD6644 (Analog Devices) - 9

AD6644 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ) B S M CC D DRY D13 ( D12 D11 D10 D9 D8 D7 D6 DV GN D5 D4 52 51 50 49 48 47 46 45 44 43 42 41 40 DV 1 CC 39 D3 PIN 1 GND 2 IDENTIFIER 38 D2 V 3 REF 37 D1 GND 4 36 D0 (LSB) ENCODE 5 35 DMID ENCODE 6 AD6644 34 GND GND 7 TOP VIEW 33 DV (Not to Scale) CC AV 8 CC 32 OVR AV 9 CC 31 DNC GND 10 30 AVCC AIN 11 29 GND AIN 12 28 AVCC GND 13 27 GND 14 15 16 17 18 19 20 21 22 23 24 25 26 DNC = DO NOT CONNECT D D D D D D CC CC CC C1 CC C2 CC
03 0
AV GN AV GN AV GN GN AV GN GN AV
71- 09 0 Figure 3. Pin Configuration
Table 8. Pin Function Descriptions Pin Number Mnemonic Description
1, 33, 43 DVCC 3.3 V Power Supply (Digital), Output Stage Only. 2, 4, 7, 10, 13, 15, 17, 19, 21, 23, 25, 27, 29, GND Ground. 34, 42 3 VREF 2.4 V (Analog Reference). Bypass to ground with 0.1 μF microwave chip capacitor. 5 ENCODE Encode Input. Conversion initiated on rising edge. 6 ENCODE Complement of ENCODE. Differential input. 8, 9, 14, 16, 18, 22, 26, 28, 30 AVCC 5 V Analog Power Supply. 11 AIN Analog Input. 12 AIN Complement of AIN. Differential analog input. 20 C1 Internal Voltage Reference. Bypass to ground with 0.1 μF microwave chip capacitor. 24 C2 Internal Voltage Reference. Bypass to ground with 0.1 μF microwave chip capacitor. 31 DNC Do not connect this pin. 32 OVR Overrange Bit. High indicates analog input exceeds ±FS. 35 DMID Output Data Voltage Midpoint. Approximately equal to DVCC/2. 36 D0 (LSB) Digital Output Bit (Least Significant Bit). Twos complement. 37 to 41, 44 to 50 D1 to D5, D6 to Digital Output Bits in Twos Complement. D12 51 D13 (MSB) Digital Output Bit (Most Significant Bit). Twos complement. 52 DRY Data Ready Output. Rev. D | Page 8 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS DC SPECIFICATIONS DIGITAL SPECIFICATIONS SWITCHING SPECIFICATIONS AC SPECIFICATIONS TIMING DIAGRAM ABSOLUTE MAXIMUM RATINGS EXPLANATION OF TEST LEVELS Test Level THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS EQUIVALENT CIRCUITS TERMINOLOGY THEORY OF OPERATION APPLYING THE AD6644 Encoding the AD6644 Analog Input Power Supplies Digital Outputs Layout Information Jitter Considerations EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE