参数资料
型号: 101-1293
厂商: Rabbit Semiconductor
文件页数: 46/118页
文件大小: 0K
描述: RCM4510W DEV KIT
标准包装: 1
类型: 收发器,微处理器
频率: 2.4GHz
适用于相关产品: RCM4510W
已供物品: 板,模块,天线,线缆,CD,文档,电源
其它名称: 316-1189
4.4.2 A/D Converter
The RCM4510W modules’ XBee RF module has four inputs on header J4 that may be set
up in software as analog inputs.
The four analog input pins, ADC0–ADC3, each have an input impedance of 6–7 M ? ,
depending on whether they are used as single-ended or differential inputs. The input signal
can range from -1.2 V to +1.2 V (differential mode) or from 0 V to +1.2 V (single-ended
mode).
Use a resistor divider such as the one shown in Figure 10 to measure voltages above 1.2 V
on the analog inputs.
ADC0
ADC1
R0
R0
ADC
(RCM4510W
ADC
ZigBee
modem)
C
C
R1
R1
3
VREF
1
AGND
Figure 10. Resistor Divider Network for Analog Inputs
The R1 resistors are typically 20 k ? to 100 k ? , with a lower resistance leading to more
accuracy, but at the expense of a higher current draw. The R0 resistors would then be
180 k ? to 900 k ? for a 10:1 attenuator. The capacitor filters noise pulses on the A/D
converter input.
The A/D converter can only accept positive voltages. With the R1 resistors connected to
ground, your analog circuit is well-suited to perform positive A/D conversions. When the
R1 resistors are tied to ground for differential measurements, both differential inputs must be
referenced to analog ground, and both inputs must be positive with respect to analog
ground .
40
RabbitCore RCM4500W
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