AT90PWM161 Atmel Corporation, AT90PWM161 Datasheet - Page 214

• Manufacturer Part Number: AT90PWM161
• Manufacturer: Atmel Corporation

Specifications of AT90PWM161

• Flash (kbytes): 16 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 20
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 3
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 1
• Output Compare Channels: 8
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

17.7
214
ADC Conversion Result
AT90PWM81
Figure 17-13. Differential Non-linearity (DNL)
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC Result
Registers (ADCL, ADCH).
For single ended conversion, the result is:
where V
on page 217
selected reference voltage.
If differential channels are used, the result is:
where V
selected gain factor and V
form, from 0x200 (-512d) through 0x1FF (+511d). Note that if the user wants to perform a quick polarity
check of the result, it is sufficient to read the MSB of the result (ADC9 in ADCH). If the bit is one, the
• Quantization Error: Due to the quantization of the input voltage into a finite number of codes, a range
• Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared to an ideal
of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
transition for any code. This is the compound effect of offset, gain error, differential error, non-
linearity, and quantization error. Ideal value: ± 0.5 LSB.
IN
POS
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
and
Output Code
Table 17-4 on page
0x000
0x3FF
REF
0
the selected voltage reference. The result is presented in two’s complement
1 LSB
ADC
217). 0x000 represents analog ground, and 0x3FF represents the
=
(
---------------------------------------------------------------------- -
V
ADC
POS
NEG
–
=
REF
V
the voltage on the negative input pin, GAIN the
V
------------------------ -
NEG
IN
V
the selected voltage reference (see
V
REF
REF
⋅
) GAIN 512
1023
⋅
V
⋅
REF
Input Voltage
7734P–AVR–08/10
Table 17-3