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AD7715 Datasheet(PDF) 30 Page - Analog Devices |
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AD7715 Datasheet(HTML) 30 Page - Analog Devices |
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30 / 41 page  Data Sheet AD7715 Rev. E | Page 29 of 40 Evaluating the AD7715 Performance The recommended layout for the AD7715 is outlined in the evaluation board for the AD7715. The evaluation board package includes a fully assembled and tested evaluation board, documentation, software for controlling the board over the USB port of a PC and software for analyzing the performance of the AD7715 on the PC. The evaluation board model number is EVAL-AD7715-3EBZ . Noise levels in the signals applied to the AD7715 may also affect performance of the part. The AD7715 software evaluation package allows the user to evaluate the true performance of the part, independent of the analog input signal. The scheme involves using a test mode on the part where the differential inputs to the AD7715 are internally shorted together to provide a zero differential voltage for the analog modulator. External to the device, connect the AIN(−) input to a voltage which is within the allowable common-mode range of the part. This scheme should be used after a calibration has been performed on the part. DIGITAL INTERFACE The programmable functions of the AD7715 are controlled using a set of on-chip registers as outlined previously. Data is written to these registers via the serial interface of the part and read access to the on-chip registers is also provided by this interface. All communications to the part must start with a write operation to the communications register. After power-on or RESET, the device expects a write to its communications register. The data written to this register determines whether the next operation to the part is a read or a write operation and also determines to which register this read or write operation occurs. Therefore, write access to any of the other registers on the part starts with a write operation to the communications register followed by a write to the selected register. A read operation from any other register on the part (including the output data register) starts with a write operation to the communications register followed by a read operation from the selected register. The serial interface of the AD7715 consists of five signals, CS, SCLK, DIN, DOUT, and DRDY. The DIN line is used for transferring data into the on-chip registers while the DOUT line is used for accessing data from the on-chip registers. SCLK is the serial clock input for the device and all data transfers (either on DIN or DOUT) take place with respect to this SCLK signal. The DRDY line is used as a status signal to indicate when data is ready to be read from the data register of the AD7715. DRDY goes low when a new data word is available in the output register. It is reset high when a read operation from the data register is complete. It also goes high prior to the updating of the output register to indicate when not to read from the device to ensure that a data read is not attempted while the register is being updated. CS is used to select the device. It can be used to decode the AD7715 in systems where a number of parts are connected to the serial bus. |
Similar Part No. - AD7715_17 |
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Similar Description - AD7715_17 |
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