AVDD C1 D R1 C2 AVDD
參數(shù)資料
型號(hào)： ADUC7129BSTZ126
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 31/92頁(yè)
文件大?。?/td> 0K
描述： IC DAS MCU ARM7 ADC/DDS 80-LQFP
產(chǎn)品培訓(xùn)模塊： Direct Digital Synthesis Tutorial Series (1 of 7): Introduction
標(biāo)準(zhǔn)包裝： 1
系列： MicroConverter® ADuC7xxx
核心處理器： ARM7
芯體尺寸： 16/32-位
速度： 41.78MHz
連通性： EBI/EMI，I²C，SPI，UART/USART
外圍設(shè)備： PLA，POR，PWM，PSM，溫度傳感器，WDT
輸入/輸出數(shù)： 38
程序存儲(chǔ)器容量： 126KB（63K x 16）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 8K x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 10x12b; D/A 1x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 125°C
封裝/外殼： 80-LQFP
包裝： 托盤
ADuC7128/ADuC7129
Rev. 0 | Page 37 of 92
AVDD
C1
D
R1 C2
AVDD
C1
D
R1 C2
06
02
0-
0
37
Figure 41. Equivalent Analog Input Circuit
Conversion Phase: Switches Open, Track Phase: Switches Closed
For ac applications, removing high frequency components from
the analog input signal is recommended through the use of an
RC low-pass filter on the relevant analog input pins. In applications
where harmonic distortion and signal-to-noise ratio are critical,
the analog input should be driven from a low impedance source.
Large source impedances significantly affect the ac performance
of the ADC and can necessitate the use of an input buffer amplifier.
The choice of the op amp is a function of the particular application.
Figure 42 and Figure 43 give an example of an ADC front end.
ADuC7128
ADC0
10
0.01F
06
02
0-
03
8
Figure 42. Buffering Single-Ended/Pseudo Differential Input
ADuC7128
ADC0
VREF
ADC1
06
02
0-
03
9
Figure 43. Buffering Differential Inputs
When no amplifier is used to drive the analog input, the source
impedance should be limited to values lower than 1 kΩ. The
maximum source impedance depends on the amount of total
harmonic distortion (THD) that can be tolerated. The THD
increases as the source impedance increases and the
performance degrades.
DRIVING THE ANALOG INPUTS
Internal or external reference can be used for the ADC. In
differential mode of operation, there are restrictions on the
common-mode input signal (VCM) that are dependent on
reference value and supply voltage used to ensure that the signal
remains within the supply rails.
gives some calculated
V
CM
minimum and VCM maximum values.
Table 39. VCM Ranges
AVDD
VREF
VCM Min
VCM Max
Signal Peak-to-Peak
2.5 V
1.25 V
2.05 V
2.5 V
2.048 V
1.024 V
2.276 V
2.048 V
3.3 V
1.25 V
0.75 V
2.55 V
1.25 V
2.5 V
1.25 V
1.75 V
2.5 V
2.048 V
1.024 V
1.976 V
2.048 V
3.0 V
1.25 V
0.75 V
2.25 V
1.25 V
TEMPERATURE SENSOR
The ADuC7128/ADuC7129 provide a voltage output from an
on-chip band gap reference proportional to absolute temperature.
The voltage output can also be routed through the front end
ADC multiplexer (effectively an additional ADC channel
input), facilitating an internal temperature sensor channel,
measuring die temperature to an accuracy of ±3°C.
The following is a code example of how to configure the ADC
for use with the temperature sensor:
int main(void)
{
float a = 0;
short b;
ADCCON = 0x20;
// power-on the ADC
delay(2000);
ADCCP = 0x10; // Select Temperature Sensor as
// an input to the ADC
REFCON = 0x01;// connect internal 2.5V
// reference to Vref pin
ADCCON = 0xE4;// continuous conversion
while(1)
{
while (!ADCSTA){};
b = (ADCDAT >> 16);
// To calculate temperature in °C, use
the formula:
a = 0x525 - b;
// ((Temperature = 0x525 - Sensor
Voltage) / 1.3)
a /= 1.3;
b = floor(a);
printf("Temperature: %d oC\n",b);
}
return 0;
}
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