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參數資料
| 型號： | MC68176 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 2-bit A/D Converter(2位A/D轉換器) |
| 中文描述： | 2位A / D轉換器（2位的A / D轉換器） |
| 文件頁數： | 26/29頁 |
| 文件大小： | 235K |
| 代理商： | MC68176 |
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Description of Operation
Operational Description
Preliminary
A-2
MC68176 Technical Data Sheet
MOTOROLA
Each threshold in
Table A-1
must be accurate to within 5% of the ideal threshold, or
the FLEX bit error rate will increase beyond acceptable levels.
The problem is that both the amplitude and the dc offset of the received signal will be
affected by many variables—temperature, voltage, production lot, vendor, and
receiver design. Because of this increase in the dynamic range, an 8-bit DAC is
required for both the peak and valley servo loops. This means that the peak and
valley levels used by the MC68176 are within one LSB of the actual peak and valley
voltage levels.
Peak and Valley Servo Description
A control loop is used to acquire the actual Peak and Valley voltages to an accuracy of
one LSB. The Peak control loop is described below; the Valley control loop is similar,
with appropriate changes made to acquire a minimum rather than a maximum signal
value.
The FLEX system uses a symbol rate of 1600 symbols per second during the
synchronization period. The MC68176 must acquire the Peak and Valley levels in six
symbol periods, with sufficient accuracy that the threshold levels used by the two-bit
A/ D are within 5% of the actual thresholds.
Table A-1
Gray Scale Regions
Signal Range
EXTS1, EXTS0
Peak
1, 0
5/ 6
1, 1
1/ 2
0, 1
1/ 6
0, 0
Valley
Figure A-2
Peak/Valley Control Loop
8-Bit
DAC
CTR
V
in
V
peak
AA1298
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