 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
MAX5631 Datasheet(PDF) 13 Page - Maxim Integrated Products |
|
||||||||||||||||||||||||||||||
MAX5631 Datasheet(HTML) 13 Page - Maxim Integrated Products |
|
|
13 / 16 page  sequencer resumes normal operation at the interrupted channel 7. Burst Mode Burst Mode allows multiple SRAM locations to be loaded at high speed. During Burst Mode, the output voltages are not updated until the data burst is com- plete and control returns to the sequencer. Select Burst Mode by driving both IMMED and C1 low. The sequencer is interrupted when CS is taken low. All or part of the memory can be loaded while CS is low. Each data word is loaded into its specified SRAM address. The DAC conversion and SHA sample in progress are completely transparent to the serial bus activity. When CS is taken high, the sequencer resumes scrolling at the interrupted SRAM address. New values are updated when their turn comes up in the sequence. After Burst Mode is used, it is recommended that at least one full sequencer loop (320µs) is allowed to occur before the serial port is accessed again. This ensures that all outputs are updated before the sequencer is interrupted. Figure 6 shows an example of a burst mode operation. As with the immediate update example, CS falls while channel 7 is being refreshed. Data for multiple chan- nels is loaded, and no channels are refreshed as long as CS remains low. Once CS returns high, sequencing resumes with channel 7 and continues normal refresh operation. Thirty-three fSEQ cycles are required before all channels have been updated. External Sequencer Clock An external clock may be used to control the sequencer, altering the output update rate. The sequencer runs at 1/4 the frequency of the supplied clock (ECLK). The external clock option is selected by driving either C0 or CLKSEL high. When CLKSEL is asserted, the internal clock oscillator is disabled. This feature allows synchronizing the sequencer to other system operations, or shutting down of the sequencer altogether during high-accuracy sys- tem measurements. The low 1mV/s droop of these devices ensures that no appreciable degradation of the output voltages occurs, even during extended periods of time when the sequencer is disabled. Power-On Reset A power-on reset (POR) circuit sets all channels to 0V (code 4F2C hex) in sequence, requiring 320µs. This prevents damage to downstream ICs due to arbitrary reference levels being presented following system power-up. This same function is available by driving RST low. During the reset operation, the sequencer is run by the internal clock, regardless of the state of CLKSEL. The reset process cannot be interrupted, seri- al inputs will be ignored until the entire reset process is complete. Applications Information Power Supplies and Bypassing Grounding and power-supply decoupling strongly influ- ence device performance. Digital signals may couple through the reference input, power supplies, and ground connection. Proper grounding and layout can reduce digital feedthrough and crosstalk. At the device level, a 0.1µF capacitor is required for the VDD, VSS, and VL_ pins. They should be placed as close to the pins as possible. More substantial decoupling at the board level is recommended and is dependent on the number of devices on the board (Figure 7). The MAX5631/MAX5632/MAX5633 have three separate +5V logic power supplies, VLDAC, VLOGIC, and VLSHA. VLDAC powers the 16-bit digital-to-analog converter, VLSHA powers the control logic of the SHA array, and VLOGIC powers the serial interface, sequencer, internal clock and SRAM. Additional filtering of VLDAC and VLSHA improves the overall performance of the device. Chip Information TRANSISTOR COUNT: 16,229 PROCESS: BiCMOS 16-Bit DACs with 32-Channel Sample-and-Hold Outputs ______________________________________________________________________________________ 13 |
Similar Part No. - MAX5631_06 |
|
Similar Description - MAX5631_06 |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
