参数资料
型号: 20-101-1138
厂商: Rabbit Semiconductor
文件页数: 61/124页
文件大小: 0K
描述: RCM4300 RABBITCORE
产品培训模块: WiFi Authentication
标准包装: 1
系列: RabbitCore®
模块/板类型: MPU 核心模块
适用于相关产品: RCM4300
其它名称: 316-1141
RabbitCore RCM4300 User’s Manual
41
4.4 A/D Converter (RCM4300 only)
The RCM4300 has an onboard ADS7870 A/D converter whose scaling and filtering are
done via the motherboard on which the RCM4300 module is mounted. The A/D converter
multiplexes converted signals from eight single-ended or four differential inputs to Serial
Port B on the Rabbit 4000.
The eight analog input pins, LN0–LN7, 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 -2 V to +2 V (differential mode) or from 0 V to +2 V (single-ended mode).
Use a resistor divider such as the one shown in Figure 10 to measure voltages above 2 V
on the analog inputs.
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 actual voltage range for a signal going to the A/D converter input is also affected by
the 1, 2, 4, 5, 8, 10, 16, and 20 V/V software-programmable gains available on each channel
of the ADS7870 A/D converter. Thus, you must scale the analog signal with an attenuator
circuit and a software-programmable gain so that the actual input presented to the A/D
converter is within the range limits of the ADS7870 A/D converter chip (-2 V to + 2 V or
0 V to + 2 V).
The A/D converter chip 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.
R0
LN0
AGND
LN1
ADC
BVREF
R0
C
R1
C
ADC
(RCM4300)
1
3
相关PDF资料
PDF描述
305-030-521-201 CONN CARDEDGE 30POS .156 GREEN
20-101-1051 MODULE RABBITCORE RCM3365
305-030-520-204 CONN CARDEDGE 30POS .156 GREEN
20-101-1196 MODULE RABBITCORE RCM3900
20-101-1105 MODULE RCM4100 RABBITCORE
相关代理商/技术参数
参数描述
20-101-1139 功能描述:模块化系统 - SOM RCM4310 RABBITCORE RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
20-101-1140 功能描述:WiFi/802.11模块 RCM4400W CORE MODULE Wi-Fi/802.11 RoHS:否 制造商:Taiyo Yuden 支持协议:802.11 b/g/n 频带: 数据速率:150 Mbps 接口类型:SDIO 传输功率(最大): 天线连接器类型: 工作电源电压:3.4 V to 5.5 V 传输供电电流: 接收供电电流: 最大工作温度:+ 80 C 尺寸:35 mm x 15 mm x 2.9 mm
20-101-1153 功能描述:子卡和OEM板 RCM4300 Proto board RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
20-101-1154 功能描述:模块化系统 - SOM RCM4120 RabbitCore- Module RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
20-101-1170 功能描述:Zigbee/802.15.4模块 RCM4510W CORE MODULE RoHS:否 制造商:Digi International 频带:902 MHz to 928 MHz 视线范围: 数据速率: 灵敏度: 工作电源电压:2.4 V to 3.6 V 传输供电电流:215 mA 接收供电电流:26 mA 输出功率:250 mW 天线连接器类型:Wire 最大工作温度:+ 85 C 尺寸:32.94 mm x 22 mm x 2.03 mm