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AD7713AQ Datasheet(PDF) 7 Page - Analog Devices |
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AD7713AQ Datasheet(HTML) 7 Page - Analog Devices |
7 / 28 page 2 –7– REV. C AD7713 PIN FUNCTION DESCRIPTION Pin Mnemonic Function 1 SCLK Serial Clock. Logic input/output depending on the status of the MODE pin. When MODE is high, the device is in its self-clocking mode and the SCLK pin provides a serial clock output. This SCLK becomes active when RFS or TFS goes low and it goes high impedance when either RFS or TFS returns high or when the device has completed transmission of an output word. When MODE is low, the device is in its external clocking mode and the SCLK pin acts as an input. This input serial clock can be a continuous clock with all data transmitted in a continuous train of pulses. Alternatively, it can be a noncontinuous clock with the information being transmitted to the AD7713 in smaller batches of data. 2 MCLK IN Master Clock signal for the device. This can be provided in the form of a crystal or external clock. A crystal can be tied across the MCLK IN and MCLK OUT pins. Alternatively, the MCLK IN pin can be driven with a CMOS-compatible clock and MCLK OUT left unconnected. The clock input frequency is nominally 2 MHz. 3 MCLK OUT When the master clock for the device is a crystal, the crystal is connected between MCLK IN and MCLK OUT. 4 A0 Address Input. With this input low, reading and writing to the device is to the control register. With thisinput high, access is to either the data register or the calibration registers. 5 SYNC Logic Input which allows for synchronization of the digital filters when using a number of AD7713s. It resets the nodes of the digital filter. 6 MODE Logic Input. When this pin is high, the device is in its self-clocking mode; with this pin low, the device is in its external clocking mode. 7 AIN1(+) Analog Input Channel 1. Positive input of the programmable gain differential analog input. The AIN1(+) input is connected to an output current source which can be used to check that an external transducer has burnt out or gone open circuit. This output current source can be turned on/off via the control register. 8 AIN1(–) Analog Input Channel 1. Negative input of the programmable gain differential analog input. 9 AIN2(+) Analog Input Channel 2. Positive input of the programmable gain differential analog input. 10 AIN2(–) Analog Input Channel 2. Negative input of the programmable gain differential analog input. 11 STANDBY Logic Input. Taking this pin low shuts down the internal analog and digital circuitry, reducing power consumption to less than 50 µW. 12 AVDD Analog Positive Supply Voltage, +5 V to +10 V. 13 RTD1 Constant Current Output. A nominal 200 µA constant current is provided at this pin and this can be used as the excitation current for RTDs. This, current can be turned on or off via the control register. 14 REF IN(–) Reference Input. The REF IN(–) can lie anywhere between AVDD and AGND provided REF IN(+) is greater than REF IN(–). 15 REF IN(+) Reference Input. The reference input is differential providing that REF IN(+) is greater than REF IN(–). REF IN(+) can lie anywhere between AVDD and AGND. 16 RTD2 Constant Current Output. A nominal 200 µA constant current is provided at this pin and this can be used as the excitation current for RTDs. This, current can be turned on or off via the control register. This second current can be used to eliminate lead resistanced errors in three-wire RTD configurations. 17 AIN3 Analog Input Channel 3. High level analog input which accepts an analog input voltage range of 4 × V REF/GAIN. At the nominal VREF of +2.5 V and a gain of 1, the AIN3 input voltage range is 0 to ±10 V. 18 AGND Ground Reference Point for Analog Circuitry. 19 TFS Transmit Frame Synchronization. Active low logic input used to write serial data to the device with serial data expected after the falling edge of this pulse. In the self-clocking mode, the serial clock becomes active after TFS goes low. In the external clocking mode, TFS must go low before the first bit of the data word is written to the part. 20 RFS Receive Frame Synchronization. Active low logic input used to access serial data from the device. In the self-clocking mode, the SCLK and SDATA lines both become active after RFS goes low. In the external clocking mode, the SDATA line becomes active after RFS goes low. |
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