ADSP-BF504 datasheet(24/80 Pages) AD

24 / 80 page

Rev. PrC

Page 24 of 80

January 2010

ADSP-BF504/F,ADSP-BF506F

Preliminary Technical Data

DOUTA, DOUTB

Serial Data Outputs. The data output is supplied to each pin as a serial data stream. The bits are clocked

out on the falling edge of the ADSCLK input and 14 ADSCLKs are required to access the data. The data

simultaneously appears on both pins from the simultaneous conversions of both ADCs. The data stream

consists of two leading zeros followed by the 12 bits of conversion data. The data is provided MSB first.

If CS is held low for 16 ADSCLK cycles rather than 14, then two trailing zeros will appear after the 12 bits

of data. If CS is held low for a further 16 ADSCLK cycles on either DOUTA or DOUTB, the data from the other

ADC follows on the DOUT pin. This allows data from a simultaneous conversion on both ADCs to be

gathered in serial format on either DOUTA or DOUTB using only one serial port. For more information, see

the ADC — Serial Interface section.

VDRIVE

Logic Power Supply Input. The voltage supplied at this pin determines at what voltage the digital I/O

interface operates. This pin should be decoupled to DGND. The voltage at this pin may be different than

that at AVDD and DVDD but should never exceed either by more than 0.3 V.

DVDD

Digital Supply Voltage, 2.7 V to 5.25 V. This is the supply voltage for all digital circuitry on the internal

ADC. The DVDD and AVDD voltages should ideally be at the same potential and must not be more than

0.3 V apart even on a transient basis. This supply should be decoupled to DGND.

Table 12. ADC — Signal Descriptions (ADSP-BF506F Processor Only) (Continued)

Signal Name

Type Function

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