参数资料
型号: 101-0814
厂商: Rabbit Semiconductor
文件页数: 22/94页
文件大小: 0K
描述: COMPUTER SNG BD BL1810 512K SRAM
标准包装: 10
系列: SBC
模块/板类型: 单板计算机模块
适用于相关产品: BL1810
User’s Manual
25
either a 0% or a 100% duty cycle. The duty cycle is programmed as the high-time count of
1024 total counts of the Rabbit 2000’s timer B. Thus, 256 counts would be 25% of 1024
counts, and corresponds to a 25% duty cycle.
Table 2 lists typical DA1 voltages measured for various duty cycle values with a load
larger than 1 M
.
It is important to remember that the DA1 output voltage will not be realized instanta-
neously after programming in a value. There is a settling time because of the RC time con-
stant (R24 × C22), which is 10 ms. For example, the voltage at any given time is
V = VP – (VP – VDA1)e
(-t/RC)
(EQ 1)
where V is the voltage at time t, VP is the programmed voltage, VDA1 is the last DA1 out-
put voltage from the D/A converter, and RC is the time constant (10 ms). The settling will
be within 99.326% (or within about 21 mV for a 3 V change in voltage) after five time
constants, or 50 ms. Six time constants, 60 ms, will allow settling to within 99.75% (or to
within about 8 mV for a 3 V change in voltage). Seven time constants, 70 ms, will allow
settling to within 99.91% (or to within about 3 mV for a 3 V change in voltage).
An LM324 op amp, which can comfortably source 10 mA throughout the D/A converter
range, drives the D/A converter output. If the output voltage is above 1 V, the D/A con-
verter can comfortably sink 10 mA. Below 1 V, the D/A converter can only sink a maxi-
mum of 100 A.
To summarize, DA1 is provided uncalibrated, can be programmed with a resolution of
5 mV and a peak-to-peak ripple less than 20 mV over the range from 0.7 V to 3.5 V and
0 V. The settling time to within 21 mV is 50 ms.
Table 2. Typical DA1 Voltages for Various Duty Cycles
Duty Cycle
(%)
Voltage
(V)
Programmed Count
0
0.002
0–122
12
0.620
123
25
1.242
256
50
2.483
512
72
3.567
742
100
3.567
743–1024
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