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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： | 27/29頁 |
| 文件大小： | 235K |
| 代理商： | MC68176 |
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Description of Operation
Operational Description
Preliminary
MOTOROLA
MC68176 Technical Data Sheet
A-3
There are two tracking modes, Fast Track mode and Slow Track mode. The use of
these two modes allows the threshold specification to be acquired in the required six
symbol periods, that is 6/ 1600 seconds or six times 625
μ
S. Fast Track mode is used
for one symbol period to obtain a very approximate value quickly, and Slow Track
mode is used for the remaining five periods to obtain an accurate value. In both Fast
Track mode and Slow Track mode, the Control loop acquires the Peak and Valley by
attacking or decaying the Peak counter at different rates.
In Fast Track mode, tracking is controlled only by the relative levels of the two signals
V
in
and the Peak DAC output. If the Peak DAC output is above V
in
, then the Peak
counter will decay, and if it is below V
in
, then the Peak counter will attack.
Slow Track mode is a little more complicated. For the Peak counter to decay, TRKINH
must be low (i.e., tracking is not inhibited), the Peak DAC output must be greater
than V
in
, and no attack or decay may have happened for a set number of CLOCK
cycles. If all these conditions are met, then the Peak DAC is decremented. The Peak
counter is incremented if TRKINH is low and the Peak DAC output is less than V
in
.
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