AD5314 Analog Devices, AD5314 Datasheet - Page 17

• Manufacturer Part Number: AD5314
• Manufacturer: Analog Devices

Specifications of AD5314

• Resolution (bits): 10bit
• Dac Update Rate: 143kSPS
• Dac Settling Time: 7µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: Ser,SPI

Data Sheet
AD5304/AD5314/AD5324 to 68HC11/68L11 Interface
Figure 37 shows a serial interface between the AD5304/AD5314/
AD5324 and the 68HC11/68L11 microcontroller. SCK of the
68HC11/68L11 drives the SCLK of the AD5304/AD5314/AD5324,
while the MOSI output drives the serial data line (DIN) of the
DAC. The SYNC signal is derived from a port line (PC7). The
setup conditions for the correct operation of this interface are as
follows: the 68HC11/68L11 is configured so that its CPOL bit is
a 0 and its CPHA bit is a 1. When data is being transmitted to the
DAC, the SYNC line is taken low (PC7). When the 68HC11/68L11
is configured as above, data appearing on the MOSI output is
valid on the falling edge of SCK. Serial data from the 68HC11/
68L11 is transmitted in 8-bit bytes with only eight falling clock
edges occurring in the transmit cycle. Data is transmitted MSB
first. To load data to the AD5304/ AD5314/AD5324, PC7 is left
low after the first eight bits are transferred, a second serial write
operation is performed to the DAC, and PC7 is taken high at
the end of this procedure.
AD5304/AD5314/AD5324 to 80C51/80L51 Interface
Figure 38 shows a serial interface between the AD5304/AD5314/
AD5324 and the 80C51/80L51 microcontroller. The setup for
the interface is as follows: TxD of the 80C51/80L51 drives SCLK
of the AD5304/AD5314/AD5324, while RxD drives the serial
data line of the part. The SYNC signal is again derived from a
bit-programmable pin on the port. In this case, port line P3.3 is
used. When data is to be transmitted to the AD5304/AD5314/
AD5324, P3.3 is taken low. The 80C51/80L51 transmits data
Figure 37. AD5304/AD5314/AD5324 to 68HC11/68L11 Interface
*ADDITIONAL PINS OMITTED FOR CLARITY.
68HC11/68L11*
MOSI
SCK
PC7
SYNC
SCLK
DIN
AD5304/
AD5314/
AD5324*
Rev. H | Page 17 of 24
only in 8-bit bytes; thus only eight falling clock edges occur in
the transmit cycle. To load data to the DAC, P3.3 is left low after
the first eight bits are transmitted, and a second write cycle is
initiated to transmit the second byte of data. P3.3 is taken high
following the completion of this cycle. The 80C51/80L51 outputs
the serial data in a format that has the LSB first. The AD5304/
AD5314/AD5324 requires its data with the MSB as the first bit
received. The 80C51/80L51 transmit routine takes this into
account.
AD5304/AD5314/AD5324 to MICROWIRE Interface
Figure 39 shows an interface between the AD5304/AD5314/
AD5324 and any MICROWIRE-compatible device. Serial data
is shifted out on the falling edge of the serial clock, SK, and is
clocked into the AD5304/AD5314/AD5324 on the rising edge
of SK, which corresponds to the falling edge of the DAC’s SCLK.
Figure 38. AD5304/AD5314/AD5324 to 80C51/80L51 Interface
Figure 39. AD5304/AD5314/AD5324 to MICROWIRE Interface
*ADDITIONAL PINS OMITTED FOR CLARITY.
*ADDITIONAL PINS OMITTED FOR CLARITY.
80C51/80L51*
MICROWIRE*
P3.3
RxD
TxD
SO
CS
SK
AD5304/AD5314/AD5324
SYNC
SCLK
DIN
SYNC
SCLK
DIN
AD5324*
AD5324*
AD5304/
AD5314/
AD5304/
AD5314/