CS5378 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS5378 Datasheet PDF : 88 Pages
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CS5378
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)
10.00 Hz
10.00 Hz
25.00 Hz
25.00 Hz
31.25 Hz
31.25 Hz
50.00 Hz
50.00 Hz
125.00 Hz
125.00 Hz
Output
Rate
(TBSCLK)
256 kHz
512 kHz
256 kHz
512 kHz
256 kHz
512 kHz
256 kHz
512 kHz
256 kHz
512 kHz
Output Rate
Selection
(RATE)
0x4
0x5
0x4
0x5
0x4
0x5
0x4
0x5
0x4
0x5
Interpolation
Selection
(INTP)
0x18
0x31
0x09
0x13
0x07
0x0F
0x04
0x09
0x01
0x03
Table 18. TBS Configurations Using On-chip Data
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
register. TBSGAIN can be programmed up to a
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).
DS639F2
61
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