AD5305 datasheet(17/24 Pages) AD

Part #	AD5305

Description	2.5 V to 5.5 V, 500 關A, Quad Voltage Output 8-/10-/12-Bit DACs in 10-Lead Packages

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17 / 24 page

Data Sheet

AD5304/AD5314/AD5324

Rev. H | Page 17 of 24

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*

68HC11/68L11*

*ADDITIONAL PINS OMITTED FOR CLARITY.

SCLK

SCK

DIN

MOSI

SYNC

PC7

Figure 37. AD5304/AD5314/AD5324 to 68HC11/68L11 Interface

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

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*

80C51/80L51*

*ADDITIONAL PINS OMITTED FOR CLARITY.

SCLK

TxD

DIN

RxD

SYNC

P3.3

Figure 38. AD5304/AD5314/AD5324 to 80C51/80L51 Interface

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.

AD5304/

AD5314/

AD5324*

MICROWIRE*

*ADDITIONAL PINS OMITTED FOR CLARITY.

SCLK

SK

DIN

SO

SYNC

CS

Figure 39. AD5304/AD5314/AD5324 to MICROWIRE Interface

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