AT90PWM161 Atmel Corporation, AT90PWM161 Datasheet - Page 212

• 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

17.6.4
212
AT90PWM81
ADC Accuracy Definitions
differential inputs using the AMPxIS bit with both inputs unconnected.
Status register – AMP0CSR” on page
the measurement results. Using this kind of software based offset correction, offset on any channel can be
reduced below one LSB.
An n-bit single-ended ADC converts a voltage linearly between GND and V
lowest code is read as 0, and the highest code is read as 2
Several parameters describe the deviation from the ideal behavior:
Figure 17-10. Offset Error
• Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal transition (at 0.5
• Gain Error: After adjusting for offset, the Gain Error is found as the deviation of the last transition
LSB). Ideal value: 0 LSB.
(0x3FE to 0x3FF) compared to the ideal transition (at 1.5 LSB below maximum). Ideal value: 0 LSB
Output Code
Offset
Error
224.). This offset residue can be then subtracted in software from
n
-1.
V
REF
(See “Amplifier 0 Control and
REF
Input Voltage
in 2
n
Ideal ADC
Actual ADC
steps (LSBs). The
7734P–AVR–08/10