Datasheet AD7940 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 3 mW, 100 kSPS, 14-Bit ADC in 6-Lead SOT-23 |
| 页数 / 页 | 21 / 8 — AD7940. PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS. SOT-23. MSOP. … |
| 修订版 | A |
| 文件格式/大小 | PDF / 395 Kb |
| 文件语言 | 英语 |
AD7940. PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS. SOT-23. MSOP. AD7490. GND. SDATA. TOP VIEW. SCLK. (Not to Scale). NC = NO CONNECT
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AD7940 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS SOT-23 MSOP V 8 CS V 6 CS DD 1 DD 1 AD7490 GND 7 SDATA GND AD7940 2 2 5 SDATA TOP VIEW TOP VIEW GND 6 NC V 3 4 SCLK IN 3 (Not to Scale) (Not to Scale) V 5 SCLK
03305-0-023
IN 4
Figure 3. SOT-23 Pin Configuration
NC = NO CONNECT
03305-0-003 Figure 4. MSOP Pin Configuration
Table 5. Pin Function Descriptions Pin No. Pin No. SOT-23 MSOP Mnemonic Function
1 1 V range for the AD7940 is from 2.5 V to 5.5 V. DD Power Supply Input. The VDD 2 2, 3 GND Analog Ground. Ground reference point for all circuitry on the AD7940. All analog input signals should be referred to this GND voltage. 3 4 V Analog Input. Single-ended analog input channel. The input range is 0 V to V . IN DD 4 5 SCLK Serial Clock. Logic input. SCLK provides the serial clock for accessing data from this part. This clock input is also used as the clock source for the AD7940's conversion process. 5 7 SDATA Data Out. Logic output. The conversion result from the AD7940 is provided on this output as a serial data stream. The bits are clocked out on the falling edge of the SCLK input. The data stream from the AD7940 consists of two leading zeros followed by 14 bits of conversion data that are provided MSB first. This will be followed by four trailing zeroes if CS is held low for a total of 24 SCLK cycles. See the Serial Interface section. 6 8 CS Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7940 and framing the serial data transfer. N/A 6 NC No Connect. This pin should be left unconnected. Rev. A | Page 7 of 20 Document Outline Table of Contents Specifications1F Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Terminology Typical Performance Characteristics Circuit Information Converter Operation Analog Input ADC Transfer Function Typical Connection Diagram Digital Inputs Modes of Operation Normal Mode Power-Down Mode Power vs. Throughput Rate Serial Interface Microprocessor Interfacing AD7940 to TMS320C541 AD7940 to ADSP-218x AD7940 to DSP563xx Application Hints Grounding and Layout Evaluating the AD7940 Performance Outline Dimensions Ordering Guide
AD7940 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS SOT-23 MSOP V 8 CS V 6 CS DD 1 DD 1 AD7490 GND 7 SDATA GND AD7940 2 2 5 SDATA TOP VIEW TOP VIEW GND 6 NC V 3 4 SCLK IN 3 (Not to Scale) (Not to Scale) V 5 SCLK
03305-0-023
IN 4
Figure 3. SOT-23 Pin Configuration
NC = NO CONNECT
03305-0-003 Figure 4. MSOP Pin Configuration
Table 5. Pin Function Descriptions Pin No. Pin No. SOT-23 MSOP Mnemonic Function
1 1 V range for the AD7940 is from 2.5 V to 5.5 V. DD Power Supply Input. The VDD 2 2, 3 GND Analog Ground. Ground reference point for all circuitry on the AD7940. All analog input signals should be referred to this GND voltage. 3 4 V Analog Input. Single-ended analog input channel. The input range is 0 V to V . IN DD 4 5 SCLK Serial Clock. Logic input. SCLK provides the serial clock for accessing data from this part. This clock input is also used as the clock source for the AD7940's conversion process. 5 7 SDATA Data Out. Logic output. The conversion result from the AD7940 is provided on this output as a serial data stream. The bits are clocked out on the falling edge of the SCLK input. The data stream from the AD7940 consists of two leading zeros followed by 14 bits of conversion data that are provided MSB first. This will be followed by four trailing zeroes if CS is held low for a total of 24 SCLK cycles. See the Serial Interface section. 6 8 CS Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7940 and framing the serial data transfer. N/A 6 NC No Connect. This pin should be left unconnected. Rev. A | Page 7 of 20 Document Outline Table of Contents Specifications1F Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Terminology Typical Performance Characteristics Circuit Information Converter Operation Analog Input ADC Transfer Function Typical Connection Diagram Digital Inputs Modes of Operation Normal Mode Power-Down Mode Power vs. Throughput Rate Serial Interface Microprocessor Interfacing AD7940 to TMS320C541 AD7940 to ADSP-218x AD7940 to DSP563xx Application Hints Grounding and Layout Evaluating the AD7940 Performance Outline Dimensions Ordering Guide