AT90LS8535-4AI datasheet(68/127 Pages) ATMEL

68 / 127 page

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

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

ADC MULTIPLEXER

SELECT (ADMUX)

ADC CTRL & STATUS

ADC DATA REGISTER

(ADCH/ADCL)

CHANNEL

MUX

CONVERSION LOGIC

10-BIT DAC

SAMPLE & HOLD

COMPARATOR

PRESCALER

AREF

ADC7

ADC6

ADC5

ADC4

ADC3

ADC2

ADC1

ADC0

AT90LS8535-4AI Datasheet(PDF) 68 Page - ATMEL Corporation

AT90LS8535-4AI Datasheet(HTML) 68 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL