REV. A

AD7677

–16–

The BYTESWAP pin allows a glueless interface to an 8-bit bus.

As shown in Figure 16, the LSB byte is output on D[7:0] and

the MSB is output on D[15:8] when BYTESWAP is low. When

BYTESWAP is high, the LSB and MSB bytes are swapped and

the LSB is output on D[15:8] and the MSB is output on D[7:0].

By connecting BYTESWAP to an address line, the 16 bits of

data can be read in 2 bytes on either D[15:8] or D[7:0].

CS

RD

BYTE

PINS D[15:8]

PINS D[7:0]

HI-Z

HI-Z

HIGH BYTE

LOW BYTE

LOW BYTE

HIGH BYTE

HI-Z

HI-Z

Figure 16. 8-Bit Parallel Interface

BUSY

CS, RD

CNVST

SYNC

SCLK

SDOUT

12

3

14

15

16

D15

D14

D2

D1

D0

X

EXT/

INT = 0

RDC/SDIN = 0

INVSCLK = INVSYNC = 0

Figure 17. Master Serial Data Timing for Reading (Read After Convert)

RDC/SDIN = 1

INVSCLK = INVSYNC = 0

D15

D14

D2

D1

D0

X

12

3

14

15

16

BUSY

SYNC

SCLK

SDOUT

CS, RD

CNVST

EXT/

INT = 0

Figure 18. Master Serial Data Timing for Reading (Read Previous Conversion During Convert)