参数资料
| 型号： | 101-0602 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 33/106页 |
| 文件大小： | 0K |
| 描述： | COMPUTER SNGL BRD BL2500 44.2MHZ |
| 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： | BL2500 |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 10106020-1 | 制造商:Amphenol Corporation 功能描述:10-305770-028 - Bulk |
| 10106020-2 | 制造商:Amphenol Corporation 功能描述:10106020-2 - Bulk |
| 10106029-001LF | 功能描述:电源到板 15DC+16S Right Angle HCI Header RoHS:否 制造商:TE Connectivity / AMP 系列:5787444 产品类型:Connectors 触点类型: 电压额定值:50 V 电流额定值: 节距: 位置/触点数量:5 安装风格:Through Hole 端接类型: 触点电镀:Tin |
| 10106031-001LF | 功能描述:电源到板 15DC+16S Right Angle HCI Receptacle RoHS:否 制造商:TE Connectivity / AMP 系列:5787444 产品类型:Connectors 触点类型: 电压额定值:50 V 电流额定值: 节距: 位置/触点数量:5 安装风格:Through Hole 端接类型: 触点电镀:Tin |
| 10106033-10013TLF | 功能描述:PCI Express / PCI 连接器 RoHS:否 制造商:JAE Electronics 系列:MM60 产品类型:PCI Express 位置/触点数量:52 安装角:Right 安装风格:SMD/SMT 端接类型:Solder Pad 外壳材料:Plastic 触点材料:Copper Alloy 触点电镀:Gold |
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