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WM2637ID Datasheet(PDF) 8 Page - Wolfson Microelectronics plc |
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WM2637ID Datasheet(HTML) 8 Page - Wolfson Microelectronics plc |
8 / 11 page WM2637 Production Data WOLFSON MICROELECTRONICS LTD PD Rev 1.0 July 99 8 PROGRAMMABLE SETTLING TIME Settling time is a software selectable 1 µs or 3.5µs typical, to within ±0.5LSB of final value. This is controlled by the value of D14. A ONE defines a settling time of 1 µs, a ZERO defines a settling time of 3.5 µs. PROGRAMMABLE POWER DOWN The power down function is controlled by D13. 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 back to the DAC code set prior to power down. REGISTER ADDRESSING A separate internal control register is available. This is accessed from the register access bits R1 (Bit D15) and R0 (Bit D12). R1 (BIT D15) R0 (BIT D12) REGISTER 0 0 Write data to DAC B and BUFFER 0 1 Write data to BUFFER 1 0 Write data to DAC A and update DAC B with BUFFER content 1 1 Write data to control register Table 3 Programmable Options The contents of the control register, shown below in Table 4, are used to program the internal reference function D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 x x x x x x x x x X REF1 REF0 Table 4 Control Register Contents PROGRAMMABLE INTERNAL REFERENCE The reference can be sourced internally or externally under software control. If an external reference voltage is applied to the REF pin, the device must be configured to accept this. If an external reference is selected, the reference voltage input is buffered which makes the DAC input resistance independent of code. The REF pin has an input resistance of 10M Ω and an input capacitance of typically 55pF. The reference voltage determines the DAC full-scale output. If an internal reference is selected, a voltage of 1.024V or 2.048V is available. The internal reference can source up to 1mA and can therefore be used as an external system reference. REF1 (BIT D1) REF0 (BIT D0) REGISTER 0 0 External 0 1 1.024V 1 0 2.048V 1 1 External Table 5 Internal Reference Options Examples: 1. Set internal reference voltage to 2.048V D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1 x 0 1 x x x x x x x x x x 1 0 2. Write new DAC A value and update DAC A output D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 x 0 0 New DAC A output value x x |
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