Datasheet AD7693 (Analog Devices) - 8

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Data Sheet AD7693 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS REF 1 10 VIO VDD 2 9 SDI AD7693 IN+ 3 8 SCK TOP VIEW IN– 4 (Not to Scale) 7 SDO REF GND 5 6 CNV 1 10 VIO VDD 2 9 SDI AD7693 NOTES IN+ 3 8 SCK TOP VIEW 1. THE EXPOSED PAD IS CONNECTED IN– 4 (Not to Scale) 7 SDO
5
TO GND. THIS CONNECTION IS NOT
006 00
REQUIRED TO MEET THE ELECTRICAL GND 5 6 CNV
4- 793- 39
PERFORMANCES.
05 06 Figure 5. 10-Lead MSOP Pin Configuration Figure 6. 10-Lead LFCSP Pin Configuration
Table 6. Pin Function Descriptions Pin No. Mnemonic Type1 Description
1 REF AI Reference Input Voltage. The REF range is from 0.5 V to VDD. It is referred to the GND pin. This pin should be decoupled closely to the pin with a 10 μF capacitor. 2 VDD P Power Supply. 3 IN+ AI Differential Positive Analog Input. 4 IN− AI Differential Negative Analog Input. 5 GND P Power Supply Ground. 6 CNV DI Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions and selects the interface mode of the part: chain or CS mode. In chain mode, the data should be read when CNV is high. In CS mode, the SDO pin is enabled when CNV is low. 7 SDO DO Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK. 8 SCK DI Serial Data Clock Input. When the part is selected, the conversion result is shifted out by this clock. 9 SDI DI Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as follows: Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital data level on SDI is output on SDO with a delay of 16 SCK cycles. CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can enable the serial output signals when low and if SDI or CNV is low when the conversion is complete, the busy indicator feature is enabled. 10 VIO P Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V, 2.5 V, 3 V, or 5 V). EPAD Exposed Pad. The exposed pad is connected to GND. This connection is not required to meet the electrical performances. The exposed pad is only on the 10-Lead LFCSP. 1AI = analog input, DI = digital input, DO = digital output, and P = power. Rev. B | Page 7 of 24 Document Outline Features Applications Application Diagram General Description Table of Contents Revision History Specification Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Theory of Operation Circuit Information Converter Operation Transfer Functions Typical Connection Diagram Analog Inputs Driver Amplifier Choice Single-Ended-to-Differential Driver Voltage Reference Input Power Supply Supplying the ADC from the Reference Digital Interface /CS Mode, 3-Wire Without Busy Indicator /CS Mode, 3-Wire with Busy Indicator /CS Mode, 4-Wire Without Busy Indicator /CS Mode, 4-Wire with Busy Indicator Chain Mode Without Busy Indicator Chain Mode with Busy Indicator Application Hints Layout Evaluating the AD7693 Performance Outline Dimensions Ordering Guide