Datasheet AD9235 (Analog Devices) - 9

AD9235 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS T B DD ND ND DD F F OTR 1 28 D11 (MSB) IN– IN+ AV AG V V AG AV RE RE MODE 2 27 D10 32 31 30 29 28 27 26 25 SENSE 3 26 D9 VREF 4 25 D8 DNC 1 24 VREF CLK 2 23 SENSE REFB 5 AD9235 24 DRVDD DNC 3 22 MODE TOP VIEW REFT 6 23 DGND PDWN AD9235 4 21 OTR (Not to Scale) TOP VIEW AVDD 7 22 D7 DNC 5 20 D11 (MSB) (Not to Scale) DNC 6 19 D10 AGND 8 21 D6 D0 (LSB) 7 18 D9 VIN+ 9 20 D5 D1 8 17 D8 VIN– 10 19 D4 9 AGND 11 18 D3 10 11 12 13 14 15 16 AVDD 12 17 D2 D2 D3 D4 D5 D6 D7 ND DD CLK 13 16 D1 DG DRV PDWN 14 15 D0 (LSB) NOTES 1. DNC = DO NOT CONNECT.
02461-003 004
2. IT IS RECOMMENDED THAT THE EXPOSED PADDLE BE SOLDERED TO THE GROUND PLANE.
02461- Figure 3. 28-Lead TSSOP Pin Configuration Figure 4. 32-Lead LFCSP Pin Configuration
Table 6. Pin Function Descriptions Pin No. Pin No. 28-Lead TSSOP 32-Lead LFCSP Mnemonic Description
1 21 OTR Out-of-Range Indicator. 2 22 MODE Data Format and Clock Duty Cycle Stabilizer (DCS) Mode Selection. 3 23 SENSE Reference Mode Selection. 4 24 VREF Voltage Reference Input/Output. 5 25 REFB Differential Reference (−). 6 26 REFT Differential Reference (+). 7, 12 27, 32 AVDD Analog Power Supply. 8, 11 28, 31 AGND Analog Ground. 9 29 VIN+ Analog Input Pin (+). 10 30 VIN– Analog Input Pin (−). 13 2 CLK Clock Input Pin. 14 4 PDWN Power-Down Function Selection (Active High). 15 to 22, 25 to 28 7 to 14, 17 to 20 D0 (LSB) to D11 (MSB) Data Output Bits. 23 15 DGND Digital Output Ground. 24 16 DRVDD Digital Output Driver Supply. Must be decoupled to DGND with a minimum. 0.1 µF capacitor. Recommended decoupling is 0.1 µF in parallel with 10 µF. 1, 3, 5, 6 DNC Do Not Connect. EP EPAD Exposed Pad. It is recommended that the exposed paddle be soldered to the ground plane. There is an increased reliability of the solder joints and maxi- mum thermal capability of the package is achieved with exposed paddle soldered to the customer board. Rev. D | Page 8 of 40 Document Outline Specifications DC Specifications Digital Specifications Switching Specifications AC Specifications Absolute Maximum Ratings Explanation of Test Levels ESD Caution Pin Configurations and Function Descriptions Definitions of Specifications Equivalent Circuits Typical Performance Characteristics Applying the AD9235 Theory of Operation Analog Input Differential Input Configurations Single-Ended Input Configuration Clock Input Considerations Power Dissipation and Standby Mode Digital Outputs Timing Voltage Reference Internal Reference Connection External Reference Operation Operational Mode Selection TSSOP Evaluation Board LFCSP Evaluation Board Outline Dimensions Ordering Guide