參數(shù)資料
型號: R5F212BASDFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP48
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù): 54/138頁
文件大小: 492K
代理商: R5F212BASDFP
234
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
21. Analog to Digital Converter - ADC
21.1
Features
10-bit Resolution
0.5 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
8- 320 s Conversion Time
Up to 125 kSPS at Maximum Resolution
11 Multiplexed Single Ended Input Channels
Two Differential input channels with accurate programmable gain 5, 10, 20 and 40
Optional Left Adjustment for ADC Result Readout
0 - V
CC ADC Input Voltage Range
Selectable 2.56 V ADC Reference Voltage
Free Running or Single Conversion Mode
ADC Start Conversion by Auto Triggering on Interrupt Sources
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
The AT90PWM2/2B/3/3B features a 10-bit successive approximation ADC. The ADC is con-
nected to an 15-channel Analog Multiplexer which allows eleven single-ended input. The single-
ended voltage inputs refer to 0V (GND).
The device also supports 2 differential voltage input combinations which are equipped with a
programmable gain stage, providing amplification steps of 14dB (5x), 20 dB (10x), 26 dB (20x),
or 32dB (40x) on the differential input voltage before the A/D conversion. On the amplified chan-
nels, 8-bit resolution can be expected.
The ADC contains a Sample and Hold circuit which ensures that the input voltage to the ADC is
held at a constant level during conversion. A block diagram of the ADC is shown in Figure 21-1.
The ADC has a separate analog supply voltage pin, AV
CC. AVCC must not differ more than ±
0.3V from V
CC. See the paragraph “ADC Noise Canceler” on page 241 on how to connect this
pin.
Internal reference voltages of nominally 2.56V or AV
CC are provided On-chip. The voltage refer-
ence may be externally decoupled at the AREF pin by a capacitor for better noise performance.
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