z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 105

• Manufacturer Part Number: z8f083a
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Analog-to-Digital Converter
Architecture
PS026308-1207
The Z8 Encore! includes an eight-channel Successive Approximation Register (SAR)
analog-to-digital converter (ADC). The ADC converts an analog input signal to a 10-bit
binary number. The features of the SAR ADC include:
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The ADC architecture, as displayed in
multiplexer, sample-and-hold amplifier, and 10-bit SAR ADC. The ADC digitizes the
signal on a selected channel and stores the digitized data in the ADC data registers. In an
environment with high electrical noise, an external RC filter must be added at the input
pins to reduce high-frequency noise.
Tconv = Ts/h + Tcon
Tconv = Ts + Th + 13*SCLK*ADC Prescaler
where,
SCLK = System clock
Tconv = Total conversion time
Ts = Sample time (SCLK*ADCST)
Tcon = Conversion time (13*SCLK*ADCCP)
Th = Hold time (SCLK*ADCSST)
DIV = ADC Prescale register number
Example (F083A @ 10 MHz)
Tconv = 1 µs + 0.5 µs +13*SCLK*DIV
Tconv = 1 µs + 0.5 µs +13*(1/10 MHz)*1 = 2.8 µs
Eight analog input sources multiplexed with general purpose I/O ports.
Fast conversion time, as low as 2.8 µs (ADC conversion clock should be less than
10 MHz).
Programmable timing controls.
Interrupt on conversion complete.
Internal voltage reference generator.
Ability to select external reference voltage.
When configuring ADC using external Vref, PB5 is used as Vref in 28-pin package.
Figure 11
on page 94, consists of an 8-input
Z8 Encore!
Product Specification
Analog-to-Digital Converter
®
F083A Series
93