參數(shù)資料
型號(hào)： 101-0577
廠商： Rabbit Semiconductor
文件頁(yè)數(shù)： 33/106頁(yè)
文件大?。?/td> 0K
描述： KIT DEV FOR BL2500 COYOTE
標(biāo)準(zhǔn)包裝： 10
系列： Coyote™
類型： 單板計(jì)算機(jī)（SBC）
適用于相關(guān)產(chǎn)品： BL2510
所含物品： SBC、開發(fā)板、交流適配器、纜線和 Dynamic C? 光盤
26
Coyote (BL2500)
Based on the standard capacitor discharge formula, this means that the maximum voltage
change will be
This is a ripple of approximately 6 mV peak-to-peak.
Table 4 lists typical uncalibrated DA0 or DA1 voltages measured for various duty cycle
values with a load larger than 1 M
.
The full D/A converter voltage range of 0–3.3 V cannot be realized because of the voltage
tolerances associated with the voltage regulator, the Rabbit 3000 PWM output, and the op-
amp rail. The circuit can achieve an actual voltage range of 0.1–3.3 V.
It is important to remember that the DA0 or DA1 output voltage will not be realized instan-
taneously after programming in a value. There is a settling time because of the RC time
constant (24.9 k
× 100 nF), which is 2.5 ms. For example, the voltage at any given time is
V = VP – (VP – VDA)e
(-t/RC)
where V is the voltage at time t, VP is the programmed voltage, VDA is the last DA0 or
DA1 output voltage from the D/A converter, and RC is the time constant (2.5 ms). The
settling will be within 99.326% (or within about 22 mV for a 3.3 V change in voltage)
after five time constants, or 12.5 ms. Six time constants, 15 ms, will allow settling to
within 99.75% (or to within about 8 mV for a 3.3 V change in voltage). Seven time con-
stants, 17.5 ms, will allow settling to within 99.91% (or to within about 3 mV for a 3.3 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, DA0 and DA1 are factory-calibrated, with the calibration constants stored
in flash memory. DA0 and DA1 can be programmed with a resolution of 3 mV and a
peak-to-peak ripple of 6 mV over the range from 0.1 to 3.1 V. The settling time to within 3
mV is 17.5 ms.
Table 4. Typical Uncalibrated DA0 or DA1 Voltages for Various Duty Cycles
Duty Cycle
(%)
Voltage
(V)
Programmed Count
0
0.086
1
50
1.628
512
100
3.244
1023
1.65 V
1
e
8.7 s
–
2.5 ms
------------------
–
5.73 mV
=
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