Datasheet

375
7682C–AUTO–04/08
AT90CAN32/64/128
Notes: 1. All DC Characteristics contained in this datasheet are based on simulation and characterization of other AVR microcontrol-
lers manufactured in the same process technology. These values are preliminary values representing design targets, and
will be updated after characterization of actual silicon.
2. Values are guidelines only.
3. Minimum for AV
CC
is 2.7 V.
4. Maximum for AV
CC
is 5.5 V
Table 27-6. ADC Characteristics, Differential Channels
(1)
Symbol Parameter Condition Min
(2)
Typ
(2)
Max
(2)
Units
Resolution
Differential Conversion
Gain = 1x or 10x
8 Bits
Differential Conversion
Gain = 200x
7 Bits
Absolute accuracy
Gain = 1x, or 10x
V
REF
= 4V, Vcc = 5V
ADC clock = 50 - 200 kHz
1 4 LSB
Gain = 200x (7 bits)
V
REF
= 4V, Vcc = 5V
ADC clock = 50 - 200 kHz
3
Integral Non-linearity (INL)
(Accuracy after Calibration
for Offset and Gain Error)
Gain = 1x, 10x or 200x
V
REF
= 4V, Vcc = 5V
ADC clock = 50 - 200 kHz
0.5 3 LSB
Differential Non-linearity
(DNL)
0.4 3 LSB
Gain Error Gain = 1x, 10x or 200x – 4 0 + 4 LSB
Offset Error
Gain = 1x, 10x or 200x
V
REF
= 4V, Vcc = 5V
ADC clock = 50 - 200 kHz
– 3 0 + 3 LSB
Clock Frequency Free Running Conversion 50 200 kHz
Conversion Time Free Running Conversion 65 260 µs
AV
CC
Analog Supply Voltage V
CC
– 0.3
(3)
V
CC
+ 0.3
(4)
V
V
REF
External Reference Voltage Differential Conversion 2.0 AV
CC - 0.5
V
V
IN
Input voltage Differential Conversion 0 AV
CC
V
V
DIFF
Input Differential Voltage –V
REF
/Gain +V
REF
/Gain V
ADC Conversion Output –511 511 LSB
Input bandwidth Differential Conversion 4 kHz
V
INT
Internal Voltage Reference 2.4 2.56 2.7 V
R
REF
Reference Input Resistance 24 32 40 kΩ
R
AIN
Analog Input Resistance 100 MΩ