CS5378 datasheet(61/88 Pages) CIRRUS

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CS5378

DS639F2

Data Delay - DDLY[5:0]

Programs full period delays for TBSDATA, up to a

maximum of 63 bits.

Gain - TBSGAIN[23:0]

Scales the amplitude of the sine wave output. Max-

imum 0x04FFFF, nominal 0x04B000.

17.4 TBS Data Source

An on-chip 24-bit 1024 point digital sine wave is

stored on the CS5378 which will produce the test

signal frequencies listed in Table 18. Additional

discrete test frequencies and output rates can be

programmed by varying the interpolation factor

and output rate.

17.5 TBS Sine Wave Output

The TBS generator uses data from digital filter

memory to create a sine wave test signal that can

drive a test DAC. Sine wave frequency and output

data rate are calculated as shown by the character-

istic equation of Table 18.

The sine wave maximum

∆Σ one’s density output

from the TBS generator is set by the TBSGAIN

maximum of 0x04FFFF, with the TBS generator

unstable for higher amplitudes. For the CS5373A

test DAC, a gain value of 0x04B000 produces an

approximately full scale sine wave output (5 Vpp

differential).

Test Bit Stream Characteristic Equation:

(Signal Freq) * (# TBS Data) * (Interpolation + 1) = Output Rate

Example: (31.25 Hz) * (1024) * (0x07 + 1) = 256 kHz

Signal

Frequency

(TBSDATA)

Output

Rate

(TBSCLK)

Output Rate

Selection

(RATE)

Interpolation

Selection

(INTP)

10.00 Hz

256 kHz

0x4

0x18

10.00 Hz

512 kHz

0x5

0x31

25.00 Hz

256 kHz

0x4

0x09

25.00 Hz

512 kHz

0x5

0x13

31.25 Hz

256 kHz

0x4

0x07

31.25 Hz

512 kHz

0x5

0x0F

50.00 Hz

256 kHz

0x4

0x04

50.00 Hz

512 kHz

0x5

0x09

125.00 Hz

256 kHz

0x4

0x01

125.00 Hz

512 kHz

0x5

0x03

Table 18. TBS Configurations Using On-chip Data

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