ATMEGA16L-8AC Atmel, ATMEGA16L-8AC Datasheet - Page 212
![IC AVR MCU 16K LV 8MHZ COM44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA16L-8AC
Manufacturer Part Number
ATMEGA16L-8AC
Description
IC AVR MCU 16K LV 8MHZ COM44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA16L-8AC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA16L-8AC
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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Analog Input Circuitry
Analog Noise
Canceling Techniques
2466T–AVR–07/10
sleep modes and the user wants to perform differential conversions, the user is advised to
switch the ADC off and on after waking up from sleep to prompt an extended conversion to get a
valid result.
The Analog Input Circuitry for single ended channels is illustrated in Figure 105. An analog
source applied to ADCn is subjected to the pin capacitance and input leakage of that pin, regard-
less of whether that channel is selected as input for the ADC. When the channel is selected, the
source must drive the S/H capacitor through the series resistance (combined resistance in the
input path).
The ADC is optimized for analog signals with an output impedance of approximately 10 kΩ or
less. If such a source is used, the sampling time will be negligible. If a source with higher imped-
ance is used, the sampling time will depend on how long time the source needs to charge the
S/H capacitor, with can vary widely. The user is recommended to only use low impedant sources
with slowly varying signals, since this minimizes the required charge transfer to the S/H
capacitor.
If differential gain channels are used, the input circuitry looks somewhat different, although
source impedances of a few hundred kΩ or less is recommended.
Signal components higher than the Nyquist frequency (f
kind of channels, to avoid distortion from unpredictable signal convolution. The user is advised
to remove high frequency components with a low-pass filter before applying the signals as
inputs to the ADC.
Figure 105. Analog Input Circuitry
Digital circuitry inside and outside the device generates EMI which might affect the accuracy of
analog measurements. If conversion accuracy is critical, the noise level can be reduced by
applying the following techniques:
1. Keep analog signal paths as short as possible. Keep them well away from high-
2. The AVCC pin on the device should be connected to the digital V
3. Use the ADC noise canceler function to reduce induced noise from the CPU.
4. If any ADC port pins are used as digital outputs, it is essential that these do not
speed switching digital tracks.
via an LC network as shown in
switch while a conversion is in progress.
ADCn
I
IH
I
IL
Figure
106.
1..100 kΩ
ADC
/2) should not be present for either
C
S/H
ATmega16(L)
= 14 pF
CC
supply voltage
V
CC
/2
212
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