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參數(shù)資料
| 型號： | AD5764BSU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Complete, Quad, 16-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 16-BIT DAC, PQFP32 |
| 封裝： | MO-026-ABA, TQFP-32 |
| 文件頁數(shù)： | 25/27頁 |
| 文件大?。?/td> | 251K |
| 代理商： | AD5764BSU |
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AD5764
Preliminary Technical Data
writing to the SPI control register (SPCR)----see the
68HC11
User Manual
. SCK of the 68HC11 drives the SCLK of the
AD5764, the MOSI output drives the serial data line (DIN) of
the AD5764, and the MISO input is driven from SDO. The
SYNC is driven from one of the port lines, in this case PC7.
When data is being transmitted to the AD5764, the SYNC line
(PC7) is taken low and data is transmitted MSB first. Data
appearing on the MOSI output is valid on the falling edge of
SCK. Eight falling clock edges occur in the transmit cycle, so, in
order to load the required 24-bit word, PC7 is not brought high
until the third 8-bit word has been transferred to the DAC’s
input shift register.
Rev. PrC 21-Oct-04| Page 26 of 28
AD5764*
SCLK
SDIN
SYNC
MOSI
SCLK
PC7
MC68HC11*
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 13. AD5764 to MC68HC11 Interface
LDAC is controlled by the PC6 port output. The DAC can be
updated after each 3-byte transfer by bringing LDAC low. This
example does not show other serial lines for the DAC. If CLR
were used, it could be controlled by port output PC5, for
example.
AD5764 to 8051 Interface
The AD5764 requires a clock synchronized to the serial data.
For this reason, the 8051 must be operated in Mode 0. In this
mode, serial data enters and exits through RxD, and a shift
clock is output on RxD.
P3.3 and P3.4 are bit programmable pins on the serial port and
are used to drive SYNC and LDAC, respectively.
The 8051 provides the LSB of its SBUF register as the first bit in
the data stream. The user must ensure that the data in the SBUF
register is arranged correctly, because the DAC expects MSB
first.
When data is to be transmitted to the DAC, P3.3 is taken low.
Data on RxD is clocked out of the microcontroller on the rising
edge of TxD and is valid on the falling edge. As a result, no glue
logic is required between this DAC and the microcontroller
interface.
The 8051 transmits data in 8-bit bytes with only eight falling
SDO
MISO
clock edges occurring in the transmit cycle. Because the DAC
expects a 24-bit word, SYNC (P3.3) must be left low after the
first eight bits are transferred. After the third byte has been
transferred, the P3.3 line is taken high. The DAC may be
updated using LDAC via P3.4 of the 8051.
AD5764 to ADSP2101/ADSP2103 Interface
An interface between the AD5764 and the ADSP2101/
ADSP2103 is shown in Figure . The ADSP2101/ADSP2103
should be set up to operate in the SPORT transmit alternate
framing mode. The ADSP2101/ADSP2103 are programmed
through the SPORT control register and should be configured
as follows: internal clock operation, active low framing, and
24-bit word length.
Transmission is initiated by writing a word to the Tx register
after the SPORT has been enabled. As the data is clocked out of
the DSP on the rising edge of SCLK, no glue logic is required to
interface the DSP to the DAC. In the interface shown, the DAC
output is updated using the LDAC pin via the DSP.
Alternatively, the LDAC input could be tied permanently low,
and then the update takes place automatically when TFS is
taken high.
AD5764*
SCLK
SDIN
SYNC
DT
SCLK
RFS
ADSP2101/
ADSP2103*
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 14. AD5764 to ADSP2101/ADSP2103 Interface
AD5764 to PIC16C6x/7x Interface
The PIC16C6x/7x synchronous serial port (SSP) is configured
as an SPI master with the clock polarity bit set to 0. This is done
by writing to the synchronous serial port control register
(SSPCON). See the
PIC16/17 Microcontroller User Manual
. In
this example, I/O port RA1 is being used to pulse SYNC and
enable the serial port of the AD5764. This microcontroller
transfers only eight bits of data during each serial transfer
operation; therefore, three consecutive write operations are
needed. Figure shows the connection diagram.
SDO
DR
TFS
LDAC
FO
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