Rainbow-electronics AT90LS4433 Manual do Utilizador descarregar pdf (Página 64)

AT90S/LS4433

1042G–AVR–09/02

Analog-to-Digital

Converter

Features • 10-bit Resolution

• ±2 LSB Absolute Accuracy

• 0.5 LSB Integral Non-linearity

• 65 - 260 µs Conversion Time

• Up to 15 kSPS

• Six Multiplexed Input Channels

• Rail-to-Rail Input Range

• Free Run or Single Conversion Mode

• Interrupt on ADC Conversion Complete

• Sleep Mode Noise Canceler

The AT90S4433 features a 10-bit successive approximation ADC. The ADC is con-

nected to a 6-channel Analog Multiplexer, which allows each pin of Port C to be used as

an input for the ADC. The ADC contains a Sample and Hold Amplifier, 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 44.

The ADC has two separate analog supply voltage pins: AVCC and AGND. AGND must

be connected to GND, and the voltage on AVCC must not differ from V

more than

±0.3V. See the section “ADC Noise Canceling Techniques” on page 70 for how to con-

nect these pins.

An external reference voltage must be applied to the AREF pin. This voltage must be in

the range 2.0 - AVCC.

Figure 44. 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)

MUX2

ADIE

ADFR

ADSC

ADEN

ADIF

MUX1

MUX0

ADPS0

ADPS1

ADPS2

CHANNEL

MUX

CONVERSION LOGIC10-BIT DAC

SAMPLE & HOLD

COMPARATOR

Analog

Inputs

External

Reference

Voltage

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 124 125

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