Electronic Components Datasheet Search |
|
WM2638 Datasheet(PDF) 10 Page - Wolfson Microelectronics plc |
|
WM2638 Datasheet(HTML) 10 Page - Wolfson Microelectronics plc |
10 / 11 page WM2638 Production Data WOLFSON MICROELECTRONICS LTD PD Rev 1.0 July 99 10 SERIAL INTERFACE REGISTER D12 = HIGH D15 = LOW DOUBLE BUFFER LATCH B TO DAC B LATCH A TO DAC A Figure 4 Double Buffer Only Write OPERATIONAL EXAMPLES 1. changing the latch A data from zero to full code Assuming that latch A starts at zero code (e.g. after power up), the latch can be filled with 1s by writing (bit D15 on the left, D0 on the right) 1X00 1111 1111 1111 to the serial interface. Bit D14 can be zero to select slow mode or one to select fast mode. The latch B contents and DAC B output are not changed by this write unless the double buffer contents are different from the latch B contents. This can only be true if the last write was a double buffer-only write. 2. changing the latch B data from zero to full code Assuming that latch B starts at zero code (e.g. after power up), the latch can be filled with 1s by writing (bit D15 on the left, D0 on the right) 0X00 1111 1111 1111 to the serial interface. Bit D14 can be zero to select slow mode or one to select fast mode. The data (bits D0 to D11) are written to both the double buffer and latch B. The latch A contents and the DAC A output are not changed by this write. 3. double buffered change of both DAC outputs Assuming that DACs A and B start at zero code (e.g. after power up), if DAC A is to be driven to mid-scale and DAC B to full-scale, and if the outputs are to begin rising at the same time, this can be achieved as follows: First, 0d01 1111 1111 1111 is written (bit D15 on the left, D0 on the right) to the serial interface. This loads the full-scale code into the double buffer but does not change the latch B contents and the DAC B output voltage. The latch A contents and the DAC A output are also unaffected by this write operation. Changing from fast to slow to fast mode changes the supply current which can glitch the outputs, and so D14 (designated by d in the above data word) should be set to maintain the speed mode set by the previous write. Next, 1d00 1000 0000 0000 is written (bit D15 on the left, D0 on the right) to the serial interface. This writes the mid-scale code (100000000000) to latch A and also copies the full-scale code from the double buffer to latch B. Both DAC outputs thus begin to rise after the second write. |
Similar Part No. - WM2638 |
|
Similar Description - WM2638 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |