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WM2623 Datasheet(PDF) 8 Page - Wolfson Microelectronics plc |
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WM2623 Datasheet(HTML) 8 Page - Wolfson Microelectronics plc |
8 / 10 page WM2623 Production Data WOLFSON MICROELECTRONICS LTD PD Rev 1.0 October 2000 8 SERIAL CLOCK AND UPDATE RATE Figure 1 shows the device timing. The maximum serial clock rate is: MHz t t f WL WH SCLK 20 1 min min max = + = Since a data word contains 16 bits, the sample rate is limited to () MHz t t f WL WH s 25 . 1 16 1 min min max = + = However, the DAC settling time to 8 bits accuracy limits the response time of the analogue output for large input step transitions. SOFTWARE CONFIGURATION OPTIONS Table 2 shows the composition of a 16 bit data word. D11-D4 contains the 8-bit data word, and D14-D13 hold the programmable options. Bits D15, D12, and D3 through D0 should be set to ZERO. D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 SPD PWR 0 New DAC value (8 bits) 0 0 0 0 Table 2 Register Map PROGRAMMABLE SETTLING TIME SPD (Bit 14) allows for software control of the converter speed. A ONE selects the fast mode, where typical settling time to within ±0.5LSB of the final value is 3µs. a ZERO puts the device into the slow mode, where typical settling time is 9 µs. PROGRAMMABLE POWER DOWN The power down function is controlled by PWR (Bit 13). A ZERO configures the device as active, or fully powered up, a ONE configures the device into power down mode. When the power down function is released the device reverts to the DAC code set prior to power down. |
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