
164
8008H–AVR–04/11
ATtiny48/88
17. ADC – Analog to Digital Converter
17.1
Features
10-bit Resolution
1 LSB Integral Non-linearity
± 2 LSB Absolute Accuracy
14 s Conversion Time
15 kSPS at Maximum Resolution
Six Multiplexed Single Ended Input Channels
– Two Additional Input Channels in 32-lead/pad/ball TQFP, QFN, and UFBGA Packages
Temperature Sensor Input Channel
Optional Left Adjustment for ADC Result Readout
0 – V
CC ADC Input Voltage Range
Selectable 1.1V ADC Reference Voltage
Free Running or Single Conversion Mode
Interrupt on ADC Conversion Complete
Sleep Mode Noise Canceler
17.2
Overview
ATtiny48/88 features a 10-bit, successive approximation Analog-to-Digital Converter (ADC). The
ADC is wired to a nine-channel analog multiplexer, which allows the ADC to measure the volt-
age at six (or eight, in 32-lead/pad/ball packages) single-ended input pins and from one internal,
single-ended voltage channel coming from the internal temperature sensor. Single-ended volt-
age inputs are referred to 0V (GND).
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 17-1There is a separate analog supply voltage pin for the ADC, AV
CC. The voltage difference
between supply voltage pins V
Internal reference voltage of nominally 1.1V is provided on-chip. Alternatively, V
CC can be used
as reference voltage.