SAA7806H NXP [NXP Semiconductors], SAA7806H Datasheet - Page 31
SAA7806H
Manufacturer Part Number
SAA7806H
Description
One chip automotive CD audio device
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.SAA7806H.pdf
(73 pages)
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Philips Semiconductors
9397 750 13697
Objective data sheet
6.6.5.6 Format of the measurement signal on MEAS pin
Use of jitter measurement:
measurement. It gives the average square value of the bit detection jitter. The jitter is
measured directly before the bit detection in this device, and contains contributions due to
various imperfections of the complete signal path: (Note that bit-to-clock jitter is
measured.)
The jitter measurement is absolute-reference, because it relates directly to the EFM bit
error rate if the disc noise is gaussian.
Internal lock flags:
PLLLockStatus register: the internally generated inner lock signal FLOCK, the internally
generated lock signal INLOCK and a LONGSYM(bol) flag when run length 14 is detected.
(Too high run length).
In automatic mode, the FLock and INLOCK flags determine what type of PLL capture
mode is used.
Table 7:
On this serial bus, which is output via pin MEAS and should be monitored using CL1
(available via another pin), three measurement signals are multiplexed together.
gives details on the format.
The data is sent in a serial format. It consists of a pause, followed by a start bit. The start
bit is followed by data bits. The bit length is four system clock periods, the frame length is
64 bits and the data format is shown in
FlOCK FLag
Fig 19. Signal format on measurement pin MEAS
•
•
•
•
•
•
Disc
Analog preamplifier
AD converter
Limited bandwidths in this device
Limited PLL performance
Influenced by internal noise filter, asymmetry compensation, equalizer.
Determining the current PLL capture mode
0
1
x
The fourth signal that can be monitored are three flags in the
Rev. 01 — 20 June 2005
pause
The jitter measurement is an absolute-reference jitter
INLOCK Flag
Table
start bit
0
0
1
8.
One chip automotive CD audio device
data bits
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Capture mode
outer lock aid
inner lock aid
in-lock
001aab763
SAA7806
Figure 19
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