Datasheet AD6645 (Analog Devices) - 9

AD6645 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SB) M CC ND DRY D13 ( D12 D11 D10 D9 D8 D7 D6 DV G 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 VREF 3 37 D1 GND 4 36 D0 (LSB) ENCODE 5 35 DMID ENCODE 6 AD6645 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 CC ND CC ND CC ND C1 ND CC ND C2 ND CC AV G AV G AV G G AV G G AV NOTES 1. DNC = DO NOT CONNECT.
003
2. EXPOSED PAD. CONNECT THE EXPOSED PAD TO GND.
02647- Figure 3. Pin Configuration
Table 7. 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, GND Ground. 27, 29, 34, 42 3 VREF 2.4 V Reference. Bypass to ground with a 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 a 0.1 µF chip capacitor. 24 C2 Internal Voltage Reference. Bypass to ground with a 0.1 µF chip capacitor. 31 DNC Do not connect this pin. 32 OVR Overrange Bit. A logic level 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 D12 Digital Output Bits in Twos Complement. 51 D13 (MSB) Digital Output Bit (Most Significant Bit); Twos Complement. 52 DRY Data-Ready Output. 53 (EPAD) Exposed Paddle (EPAD) Exposed Pad. Connect the exposed pad to GND. Rev. E | Page 8 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY SPECIFICATIONS DC SPECIFICATIONS DIGITAL SPECIFICATIONS AC SPECIFICATIONS SWITCHING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE EXPLANATION OF TEST LEVELS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS EQUIVALENT CIRCUITS TERMINOLOGY THEORY OF OPERATION APPLYING THE AD6645 Encoding the AD6645 Driving the Analog Inputs Power Supplies Digital Outputs Grounding LAYOUT INFORMATION JITTER CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE