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WM2631IDT Datasheet(PDF) 11 Page - Wolfson Microelectronics plc |
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WM2631IDT Datasheet(HTML) 11 Page - Wolfson Microelectronics plc |
11 / 13 page Production Data WM2631 WOLFSON MICROELECTRONICS LTD PD Rev 1.1 April 2001 11 DAC A TO H CODE REGISTERS Addresses 0 to 7 are the DAC registers. Bits D11 (MSB) to D2 (LSB) from these registers are transferred to the respective DAC when the LOADB input (pin 18) is low. Bits D1 and D0 are unused and should be set to 0. For instantaneous updating, LOADB can be held low permanently. CONTROL REGISTER 0 Control register 0 (address 8) is used to select functions that apply to the whole IC, such as Power Down and Data Input Format. BIT D11 D10 D9 D8D7D6D5 D4 D3 D2 D1 D0 Function X X XXXX X PD DO R1 R0 IM Default X X XXXX X 0 0000 Table 5 Control Register 0 Map BIT DESCRIPTION 0 1 PD Full device Power Down Normal Power Down DO DOUT Enable Disabled Enabled R1 Int / Ext Reference Select External Internal R0 Internal Reference Select 1.024V 2.048V IM Input Mode Straight Binary Two’s Complement X Reserved Table 6 Control Register 0 Functionality CONTROL REGISTER 1 Control register 1 (address 9) is used to power down individual pairs of DACs and select their settling time. Powering down a pair of DACs disables their amplifiers and reduces the power consumption of the device. The settling time in fast mode is typically 1 µs. In slow mode, the settling time is typically 3 µs and power consumption is reduced. BIT D11 D10 D9 D8D7D6D5 D4 D3 D2 D1 D0 Function X X X X PGH PEF PCD PAB SGH SEF SCD SAB Default X X X X 0 0 0 0 0 0 0 0 Table 7 Control Register 1 Map BIT DESCRIPTION 0 1 PXY Power Down DACs X and Y Normal Power Down SXY Speed Setting for DACs X and Y Slow Fast Table 8 Control Register 1 Functionality DAC PRESET REGISTER The Preset register (address 10) makes it possible to update all eight DACs at the same time. The value stored in this register becomes the digital input to all the DACs when the asynchronous PREB input (pin 5) is driven low. If no data has previously been written to the preset register, all DACs are set to zero scale. TWO-CHANNEL REGISTERS The two-channel registers (addresses 12 to 15) provide a ‘differential output’ function where writing data to one DAC will automatically write the complement to the other DAC in the pair. For example, writing a value of 1023 to address 12 will set DAC A to full scale and DAC B to zero scale. |
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