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AD7660 Datasheet(PDF) 11 Page - Analog Devices |
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AD7660 Datasheet(HTML) 11 Page - Analog Devices |
11 / 20 page REV. D AD7660 –11– 100nF 10 F 100nF 10 F AVDD 10 F 100nF AGND DGND DVDD OVDD OGND CS RD SER/ PAR CNVST BUSY SDOUT SCLK RESET PD IN INGND NOTE 2 U1 REFGND CREF NOTE 1 2.5V REF NOTE 1 REF 100 D NOTE 3 CLOCK AD7660 ANALOG INPUT (0V TO 2.5V) C/ P/DSP SERIAL PORT DIGITAL SUPPLY (3.3V OR 5V) ANALOG SUPPLY (5V) DVDD OB/ 2C NOTES 1. WITH THE AD780 OR THE ADR291 VOLTAGE REFERENCE, CREF IS 47 F, SEE VOLTAGE REFERENCE INPUT SECTION. 2. THE OP184 IS RECOMMENDED. 3. OPTIONAL LOW JITTER CNVST. Figure 5. Typical Connection Diagram Transfer Functions Using the OB/ 2C digital input, the AD7660 offers two output codings: straight binary and twos complement. The LSB size is VREF/65536, which is about 38.15 mV. The ideal transfer charac- teristic for the AD7660 is shown in Figure 4 and Table II. 000...000 000...001 000...010 111...101 111...110 111...111 ANALOG INPUT VREF –1.5 LSB VREF –1 LSB 1 LSB 0V 0.5 LSB 1 LSB = VREF/65536 Figure 4. ADC Ideal Transfer Function Table II. Output Codes and Ideal Input Voltages Digital Output Code (Hex) Analog Straight Twos Description Input Binary Complement FSR – 1 LSB 2.499962 V FFFF 1 7FFF 1 FSR – 2 LSB 2.499923 V FFFE 7FFE Midscale + 1 LSB 1.250038 V 8001 0001 Midscale 1.25 V 8000 0000 Midscale – 1 LSB 1.249962 V 7FFF FFFF –FSR + 1 LSB 38 mV 0001 8001 –FSR 0 V 0000 2 8000 2 NOTES 1This is also the code for overrange analog input (V IN – VINGND above VREF – VREFGND). 2This is also the code for underrange analog input (V IN below VINGND). TYPICAL CONNECTION DIAGRAM Figure 5 shows a typical connection diagram for the AD7660. |
Similar Part No. - AD7660_15 |
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Similar Description - AD7660_15 |
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