AD7262BSTZ datasheet(29/32 Pages) AD

29 / 32 page

AD7262

Rev. 0 | Page 29 of 32

MICROPROCESSOR INTERFACING

The serial interface on the AD7262/AD7262-5 allows the parts

to be directly connected to a range of different microprocessors.

This section explains how to interface the AD7262/AD7262-5

with the Analog Devices, Inc., Blackfin® DSP, the ADSP-BF537.

AD7262/AD7262-5 TO ADSP-BF53x

The ADSP-BF53x family of DSPs interface directly to the

AD7262/AD7262-5 without any glue logic required. The

VDRIVE pin of the AD7262/AD7262-5 takes the same supply

voltage as that of the ADSP-BF53x. This allows the ADC to

operate at a higher supply voltage than its serial interface and,

therefore, the ADSP-BF53x, if necessary. 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 37 shows both DOUTA and

DOUTB of the AD7262/AD7262-5 connected to Serial Port 0 of

the ADSP-BF53x. The SPORT0 Receive Configuration 1

be set up as outlined in Table 14 and Table 15.

SERIAL

DEVICE A

(PRIMARY)

SERIAL

DEVICE B

(SECONDARY)

AD72621

DOUTA

SCLK

ADSP-BF53x1

1ADDITIONAL PINS OMITTED FOR CLARITY.

DR0PRI

DR0SEC

RFS0

VDRIVE

VDD

DOUTB

RCLK0

SPORT0

Figure 37. Interfacing the AD7262 to the ADSP-BF53x

Table 14. 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 receive frame sync (RFS) used

RLSBIT = 0

Receive MSB first

RDTYPE = 00

Zero fill

IRCLK = 1

Internal receive clock

RSPEN = 1

Receive enabled

SLEN = 11110

31-bit data-word

TFSR = RFSR = 1

Table 15. The SPORT0 Receive Configuration 2 Register

(SPORT0_RCR2)

Setting

Description

RXSE = 1

Secondary side enabled

A Blackfin driver for the AD7262/AD7262-5 is available to

download at www.analog.com.

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