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AD7896BR Datasheet(PDF) 4 Page - Analog Devices |
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AD7896BR Datasheet(HTML) 4 Page - Analog Devices |
4 / 12 page REV. B –4– AD7896 PIN FUNCTION DESCRIPTION Pin Pin No. Mnemonic Description 1VIN Analog Input. The analog input range is 0 V to VDD. 2VDD Positive supply voltage, +2.7 V to 5.5 V. 3 AGND Analog Ground. Ground reference for track/hold, comparator and DAC. 4 SCLK Serial Clock Input. An external serial clock is applied to this input to obtain serial data from the AD7896. A new serial data bit is clocked out on the falling edge of this serial clock. Data is guaranteed valid for 10 ns after this falling edge so data can be accepted on the falling edge when a fast serial clock is used. The serial clock input should be taken low at the end of the serial data transmission. 5 SDATA Serial Data Output. Serial data from the AD7896 is provided at this output. The serial data is clocked out by the falling edge of SCLK, but the data can also be read on the falling edge of the SCLK. This is possible because data bit N is valid for a specified time after the falling edge of the SCLK (data hold time) and can be read before data bit N+1 becomes valid a specified time after the falling edge of SCLK (data access time) (see Figure 4). Sixteen bits of serial data are provided with four leading zeros followed by the 12 bits of conversion data. On the sixteenth falling edge of SCLK, the SDATA line is held for the data hold time and then disabled (three-stated). Output data coding is straight binary. 6 DGND Digital Ground. Ground reference for digital circuitry. 7 CONVST Convert Start. Edge-triggered logic input. On the falling edge of this input, the track/hold goes into its hold mode and conversion is initiated. If CONVST is low at the end of conver- sion, the part goes into power down mode. In this case, the rising edge of CONVST “wakes up” the part. 8 BUSY The BUSY pin is used to indicate when the part is doing a conversion. The BUSY pin will go high on the falling edge of CONVST and will return low when the conversion is complete. PIN CONFIGURATION 1 2 3 4 8 7 6 5 TOP VIEW (Not to Scale) AD7896 VIN SDATA DGND CONVST BUSY VDD AGND SCLK ORDERING GUIDE Temperature Linearity SNR Package Model Range Error (LSB) (dB) Option* AD7896AN –40 °C to +85°C ±1 LSB 70 dB N-8 AD7896BN –40 °C to +85°C ±1/2 LSB 70 dB N-8 AD7896AR –40 °C to +85°C ±1 LSB 70 dB SO-8 AD7896BR –40 °C to +85°C ±1/2 LSB 70 dB SO-8 AD7896JR 0 °C to +70°C ±1 LSB 70 dB SO-8 AD7896SQ –55 °C to +125°C ±1 LSB 70 dB Q-8 *N = Plastic DIP; Q = Cerdip; SO = SOIC. |
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