AD7266 datasheet(25/29 Pages) AD

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AD7266

Rev. B | Page 24 of 28

AD7266 TO ADSP-BF53x

The ADSP-BF53x family of DSPs interface directly to the

AD7266 without any glue logic required. The availability of

secondary receive registers on the serial ports of the Blackfin®

DSPs means only one serial port is necessary to read from both

DOUT pins simultaneously. Figure 44 shows both DOUTA and

DOUTB of the AD7266 connected to Serial Port 0 of the

ADSP-BF53x. The SPORT0 Receive Configuration 1 register

and SPORT0 Receive Configuration 2 register should be set up

as outlined in Table 9 and Table 10.

SERIAL

DEVICE A

(PRIMARY)

SERIAL

DEVICE B

(SECONDARY)

AD72661

DOUTA

SCLK

ADSP-BF53x1

1ADDITIONAL PINS OMITTED FOR CLARITY.

DR0PRI

DR0SEC

RFS0

VDRIVE

VDD

DOUTB

RCLK0

SPORT0

Figure 44. Interfacing the AD7266 to the ADSP-BF53x

Table 9. The SPORT0 Receive Configuration 1 Register

(SPORT0_RCR1)

Setting

Description

RCKFE = 1

Sample data with falling edge of RSCLK

LRFS = 1

Active low frame signal

RFSR = 1

Frame every word

IRFS = 1

Internal RFS used

RLSBIT = 0

Receive MSB first

RDTYPE = 00

Zero fill

IRCLK = 1

Internal receive clock

RSPEN = 1

Receive enabled

SLEN = 1111

16-bit data-word (or may be set to 1101

for 14-bit data-word)

TFSR = RFSR = 1

Table 10. The SPORT0 Receive Configuration 2 Register

(SPORT0_RCR2)

Setting

Description

RXSE = 1

Secondary side enabled

SLEN = 1111

16-bit data-word ( or may be set to 1101

for 14-bit data-word)

To implement the power-down modes, SLEN should be set to

1001 to issue an 8-bit SCLK burst. A Blackfin driver for the

AD7266 is available to download at www.analog.com.

AD7266 TO TMS320C541

The serial interface on the TMS320C541 uses a continuous

serial clock and frame synchronization signals to synchronize

the data transfer operations with peripheral devices like the

AD7266. The CS input allows easy interfacing between the

TMS320C541 and the AD7266 without any glue logic required.

The serial ports of the TMS320C541 are set up to operate in

burst mode with internal CLKX0 (TX serial clock on Serial

Port 0) and FSX0 (TX frame sync from Serial Port 0). The serial

port control registers (SPC) must have the following setup.

Table 11. Serial Port Control Register Set Up

SPC

FSM

MCM

TXM

SPC0

SPC1

The format bit, FO, may be set to 1 to set the word length to

8 bits to implement the power-down modes on the AD7266.

The connection diagram is shown in Figure 45. It is imperative

that for signal processing applications, the frame synchroniza-

tion signal from the TMS320C541 provides equidistant sampling.

The VDRIVE pin of the AD7266 takes the same supply voltage as

that of the TMS320C541. This allows the ADC to operate at a

higher voltage than its serial interface and therefore, the

TMS320C541, if necessary.

FSR1

FSR0

AD72661

SCLK

TMS320C5411

1ADDITIONAL PINS OMITTED FOR CLARITY.

CLKX0

DR1

CLKR1

CLKX1

DOUTB

DOUTA

VDRIVE

VDD

FSX0

DR0

CLKR0

Figure 45. Interfacing the AD7266 to the TMS320C541

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