ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 1058

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

41.5.5
1058
SAM3U Series
Input Gain and Offset
Table 41-4.
Table 41-5.
The ADC12B has a built in Programmable Gain Amplifier (PGA) and Programmable Offset.
The Programmable Gain Amplifier can be set to gains of 1/2, 1, 2 and 4. The Programmable
Gain Amplifier can be used either for single ended applications or for fully differential
applications.
The gain is configurable through the GAIN bit as shown in
Table 41-6.
To allow full range, analog offset of the ADC12B can be configured by the OFFSET bit. The Off-
set can only be changed in single ended mode. In fully differential mode the offset is always set
to Vrefin/2.
Table 41-7.
Input Pins
AD12B0
AD12B1
AD12B2
AD12B3
AD12B4
AD12B5
AD12B6
AD12B7
Input Pins
AD12B0-AD12B1
AD12B2-AD12B3
AD12B4-AD125B
AD12B6-AD12B7
OFFSET Bit
GAIN<0:1>
00
01
10
11
0
1
Input Pins and Channel Number in Single Ended Mode
Input Pins and Channel Number In Differential Mode
Gain of the Sample and Hold Unit: GAIN Bits and DIFF Bit.
Offset of the Sample and Hold Unit: OFFSET DIFF and Gain (G)
OFFSET (DIFF = 0)
GAIN (DIFF = 0)
Vrefin/2G
Vrefin/2
1
1
2
4
Channel Number
CH0
CH2
CH4
CH6
Channel Number
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
Table
41-6.
OFFSET (DIFF = 1)
GAIN (DIFF = 1)
Vrefin/2
0.5
6430D–ATARM–25-Mar-11
1
2
2