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ATmega32(L)

ADC Characteristics

Table 122.	ADC Characteristics, Single Ended channels, TA = -40°C to 85°C
Symbol	Parameter	Condition	Min	Typ	Max	Units

	Resolution	Single Ended Conversion		10		Bits

		Single Ended Conversion
		VREF = 4V, VCC = 4V		1.5		LSB
		ADC clock = 200 kHz

		Single Ended Conversion
		VREF = 4V, VCC = 4V		3		LSB
		ADC clock = 1 MHz
	Absolute Accuracy (Including INL, DNL,
	Absolute Accuracy (Including INL, DNL,	Single Ended Conversion
	Quantization Error, Gain, and Offset Error)	Single Ended Conversion
	Quantization Error, Gain, and Offset Error)	VREF = 4V, VCC = 4V		1.5		LSB
		VREF = 4V, VCC = 4V
		ADC clock = 200 kHz
		ADC clock = 200 kHz
		Noise Reduction mode

		Single Ended Conversion
		VREF = 4V, VCC = 4V		3		LSB
		ADC clock = 1 MHz		3		LSB
		ADC clock = 1 MHz
		Noise Reduction mode

		Single Ended Conversion
	Integral Non-Linearity (INL)	VREF = 4V, VCC = 4V		0.75		LSB
		ADC clock = 200 kHz

		Single Ended Conversion
	Differential Non-linearity (DNL)	VREF = 4V, VCC = 4V		0.25		LSB
		ADC clock = 200 kHz

		Single Ended Conversion
	Gain Error	VREF = 4V, VCC = 4V		0.75		LSB
		ADC clock = 200 kHz

		Single Ended Conversion
	Offset Error	VREF = 4V, VCC = 4V		0.75		LSB
		ADC clock = 200 kHz

	Clock Frequency		50		1000	kHz

	Conversion Time		13		260	µs

AVCC	Analog Supply Voltage		V - 0.3(1)		V + 0.3(2)	V
			CC		CC
VREF	Reference Voltage		2.0		AVCC	V
VIN	Input voltage		GND		VREF	V
	ADC conversion output		0		1023	LSB

	Input bandwith			38.5		kHz

VINT	Internal Voltage Reference		2.3	2.56	2.7	V
RREF	Reference Input Resistance			32		kΩ
RAIN	Analog Input Resistance			100		MΩ

Notes: 1. Minimum for AVCC is 2.7V. 2. Maximum for AVCC is 5.5V.

291

2503F–AVR–12/03

Table 123.

ADC Characteristics, Differential channels, TA = -40°C to 85°C

Symbol

Parameter

Condition

Min

Typ

Max

Units

Gain = 1x

Bits

Resolution

Gain = 10x

Bits

Gain = 200x

Bits

Gain = 1x

VREF = 4V, VCC = 5V

LSB

ADC clock = 50 - 200 kHz

Gain = 10x

Absolute Accuracy

VREF = 4V, VCC = 5V

LSB

ADC clock = 50 - 200 kHz

Gain = 200x

VREF = 4V, VCC = 5V

LSB

ADC clock = 50 - 200 kHz

Gain = 1x

VREF = 4V, VCC = 5V

0.75

LSB

ADC clock = 50 - 200 kHz

Integral Non-Linearity (INL)

Gain = 10x

(Accuracy after calibration for Offset and

VREF = 4V, VCC = 5V

0.75

LSB

Gain Error)

ADC clock = 50 - 200 kHz

Gain = 200x

VREF = 4V, VCC = 5V

LSB

ADC clock = 50 - 200 kHz

Gain = 1x

1.6

Gain Error

Gain = 10x

1.5

Gain = 200x

0.2

Gain = 1x

VREF = 4V, VCC = 5V

LSB

ADC clock = 50 - 200 kHz

Gain = 10x

Offset Error

VREF = 4V, VCC = 5V

1.5

LSB

ADC clock = 50 - 200 kHz

Gain = 200x

VREF = 4V, VCC = 5V

4.5

LSB

ADC clock = 50 - 200 kHz

Clock Frequency

200

kHz

Conversion Time

260

µs

AVCC

Analog Supply Voltage

- 0.3(1)

+ 0.3(2)

VREF

Reference Voltage

2.0

AVCC - 0.5

VIN

Input voltage

GND

VCC

VDIFF

Input differential voltage

-VREF/Gain

VREF/Gain/

ADC conversion output

-511

511

LSB

Input bandwith

kHz

292 ATmega32(L)

2503F–AVR–12/03

ATmega32(L)

Table 123.	ADC Characteristics, Differential channels, TA = -40°C to 85°C (Continued)
Symbol	Parameter	Condition	Min	Typ	Max	Units

VINT	Internal Voltage Reference		2.3	2.56	2.7	V
RREF	Reference Input Resistance			32		kΩ
RAIN	Analog Input Resistance			100		MΩ

Notes: 1. Minimum for AVCC is 2.7V. 2. Maximum for AVCC is 5.5V.

293

2503F–AVR–12/03

ATmega32 Typical

Characteristics –

Preliminary Data

The following charts show typical behavior. These figures are not tested during manufacturing. All current consumption measurements are performed with all I/O pins configured as inputs and with internal pull-ups enabled. A sine wave generator with rail- to-rail output is used as clock source.

The power consumption in Power-down mode is independent of clock selection.

The current consumption is a function of several factors such as: operating voltage, operating frequency, loading of I/O pins, switching rate of I/O pins, code executed and ambient temperature. The dominating factors are operating voltage and frequency.

The current drawn from capacitive loaded pins may be estimated (for one pin) as CL*VCC*f where CL = load capacitance, VCC = operating voltage and f = average switching frequency of I/O pin.

The parts are characterized at frequencies higher than test limits. Parts are not guaranteed to function properly at frequencies higher than the ordering code indicates.

The difference between current consumption in Power-down mode with Watchdog Timer enabled and Power-down mode with Watchdog Timer disabled represents the differential current drawn by the Watchdog Timer.

Figure 148. RC Oscillator Frequency vs. Temperature (the devices are calibrated to 1 MHz at Vcc = 5V, T=25c)

CALIBRATED 1MHz RC OSCILLATOR FREQUENCY

vs. TEMPERATURE

	1.03
	1.02
	1.01
	1						Vcc	= 5.5V
							Vcc	= 5.5V
	0.99						Vcc = 5.0V
	0.98						Vcc = 5.0V
(MHz)	0.98						Vcc = 4.5V
	0.97						Vcc = 4.5V
	0.97
Rc							Vcc	= 4.0V
F	0.96						Vcc	= 4.0V
	0.96
	0.95						Vcc = 3.6V
	0.95						Vcc = 3.3V
	0.94						Vcc = 3.3V
	0.94						Vcc	= 3.0V
							Vcc	= 3.0V
	0.93						Vcc	= 2.7V
							Vcc	= 2.7V
	0.92
	-40	-20	0	20	40	60	80
				Ta(˚C)

294 ATmega32(L)

2503F–AVR–12/03

ATmega32(L)

Figure 149. RC Oscillator Frequency vs. Operating Voltage (the devices are calibrated to 1 MHz at Vcc = 5V, T=25c)

CALIBRATED 1MHz RC OSCILLATOR FREQUENCY

vs. OPERATING VOLTAGE

	1.03
	1.02					TA = -40˚C	TA = -10˚C
						TA = -40˚C	TA = -10˚C
	1.01						TA = 25˚C
							TA = 45˚C
	1						TA = 70˚C
	0.99					TA = 85˚C
	0.98					TA = 85˚C
(MHz)	0.98
(MHz)	0.97
Rc
F	0.96
	0.96
	0.95
	0.94
	0.93
	0.92
	2.5	3	3.5	4	4.5	5	5.5

Vcc(V)

Figure 150. RC Oscillator Frequency vs. Temperature (the devices are calibrated to 2 MHz at Vcc = 5V, T=25c)

CALIBRATED 2MHz RC OSCILLATOR FREQUENCY

vs. TEMPERATURE

	2.1
	2.05
	2						Vcc = 5.5V
							Vcc = 5.5V
(MHz)	1.95						Vcc = 5.0V
	1.95
							Vcc	= 4.5V
Rc							Vcc	= 4.5V
F							Vcc = 4.0V
	1.9						Vcc = 4.0V
	1.9
							Vcc = 3.6V
	1.85						Vcc = 3.3V
	1.85						Vcc	= 3.0V
							Vcc	= 3.0V
	1.8						Vcc = 2.7V
	1.8
	-40	-20	0	20	40	60	80
				Ta(˚C)

295

2503F–AVR–12/03

Figure 151. RC Oscillator Frequency vs. Operating Voltage (the devices are calibrated to 2 MHz at Vcc = 5V, T=25c)

CALIBRATED 2MHz RC OSCILLATOR FREQUENCY

vs. OPERATING VOLTAGE

	2.1
	2.05						TA = -10˚C
						TA = -40˚C	TA = -10˚C
							TA = 25˚C
	2						TA = 45˚C
	2						TA = 70˚C
(MHz)	1.95						TA = 85˚C
	1.95

Rc
F
	1.9
	1.85
	1.8
	2.5	3	3.5	4	4.5	5	5.5

Vcc(V)

Figure 152. RC Oscillator Frequency vs. Temperature (the devices are calibrated to 4 MHz at Vcc = 5V, T=25c)

CALIBRATED 4MHz RC OSCILLATOR FREQUENCY

vs. TEMPERATURE

	4.1
	4.05
	4
	3.95						Vcc = 5.5V
	3.95						Vcc = 5.0V
							Vcc = 5.0V
	3.9						Vcc = 4.5V
							Vcc = 4.5V
(MHz)	3.85						Vcc = 4.0V
(MHz)
Rc	3.8						V = 3.6V
F							V = 3.6V
F							cc
	3.75						Vcc = 3.3V
	3.75
	3.7						Vcc = 3.0V
	3.7
	3.65						Vcc = 2.7V
	3.65
	3.6
	-40	-20	0	20	40	60	80
				Ta(˚C)

296 ATmega32(L)

2503F–AVR–12/03

ATmega32(L)

Figure 153. RC Oscillator Frequency vs. Operating Voltage (the devices are calibrated to 4 MHz at Vcc = 5V, T=25c)

F (MHz)

CALIBRATED 4MHz RC OSCILLATOR FREQUENCY vs. OPERATING VOLTAGE

4.1

4.05						TA = -40˚C
4.05						TA = -10˚C
						TA = -10˚C
4						TA = 25˚C
4						TA = 45˚C
						TA = 45˚C
3.95						TA = 70˚C
3.95
3.9						TA = 85˚C
3.9
3.85
3.8
3.75
3.7
3.65
3.6
2.5	3	3.5	4	4.5	5	5.5

Vcc(V)

Figure 154. RC Oscillator Frequency vs. Temperature (the devices are calibrated to 8

MHz at Vcc = 5V, T=25c)

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY

vs. TEMPERATURE

	8.5
	8.3
	8.1
	7.9						Vcc = 5.5V
							Vcc = 5.5V
	7.7						Vcc = 5.0V
(MHz)	7.7						Vcc = 4.5V
							Vcc = 4.5V
	7.5						Vcc = 4.0V
Rc
F							Vcc = 3.6V
	7.3						Vcc = 3.6V
	7.3						Vcc = 3.3V
							Vcc = 3.3V
	7.1						Vcc = 3.0V
	6.9						Vcc = 2.7V
							Vcc = 2.7V
	6.7
	-40	-20	0	20	40	60	80
				Ta(˚C)

297

2503F–AVR–12/03

Figure 155. RC Oscillator Frequency vs. Operating Voltage (the devices are calibrated to 8 MHz at Vcc = 5V, T=25c)

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY

vs. OPERATING VOLTAGE

	8.5
	8.3					TA = -40˚C
	8.3						TA = -10˚C
							TA = -10˚C
	8.1						TA = 25˚C
							TA = 45˚C
	7.9						TA = 70˚C
	7.7						TA = 85˚C
(MHz)	7.7
(MHz)	7.5
Rc
F
	7.3
	7.1
	6.9
	6.7
	2.5	3	3.5	4	4.5	5	5.5

Vcc(V)

298 ATmega32(L)

2503F–AVR–12/03

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