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AT90S8535 Datasheet(PDF) 68 Page - ATMEL Corporation

Part No. AT90S8535
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8535 Datasheet(HTML) 68 Page - ATMEL Corporation

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68
AT90S/LS8535
1041H–11/01
Analog-to-Digital
Converter
Feature list
10-bit Resolution
0.5 LSB Integral Non-linearity
±2 LSB Absolute Accuracy
65 - 260 µs Conversion Time
Up to 15 kSPS at Maximum Resolution
8 Multiplexed Input Channels
Rail-to-Rail Input Range
Free Running or Single Conversion Mode
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
The AT90S8535 features a 10-bit successive approximation ADC. The ADC is con-
nected to an 8-channel Analog Multiplexer that allows each pin of Port A to be used as
an input for the ADC. The ADC contains a Sample and Hold Amplifier that ensures that
the input voltage to the ADC is held at a constant level during conversion. A block dia-
gram of the ADC is shown in Figure 45.
The ADC has two separate analog supply voltage pins, AVCC and AGND. AGND must
be connected to GND and the voltage on AV
CC must not differ more than ±0.3V from
V
CC. See “ADC Noise Canceling Techniques” on page 74 on how to connect these pins.
An external reference voltage must be applied to the AREF pin. This voltage must be in
the range 2V - AV
CC.
Figure 45. Analog-to-Digital Converter Block Schematic
ADC CONVERSION
COMPLETE IRQ
8-BIT DATA BUS
15
0
ADC MULTIPLEXER
SELECT (ADMUX)
ADC CTRL & STATUS
REGISTER (ADCSR)
ADC DATA REGISTER
(ADCH/ADCL)
8-
CHANNEL
MUX
CONVERSION LOGIC
10-BIT DAC
+
-
SAMPLE & HOLD
COMPARATOR
PRESCALER
AREF
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0


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