ATA5771-DK1 Atmel, ATA5771-DK1 Datasheet - Page 141

• Manufacturer Part Number: ATA5771-DK1
• Description: BOARD XMITTER FOR ATA5771 868MHZ
• Manufacturer: Atmel
• Type: Transmitterr

Specifications of ATA5771-DK1

• Frequency: 868MHz
• Maximum Frequency: 868 MHz
• Supply Voltage (max): 4 V
• Supply Voltage (min): 2 V
• Supply Current: 8.5 mA
• Product: RF Development Tools
• For Use With/related Products: ATA5771
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.20.3
9137E–RKE–12/10
ADC Operation
Figure 4-59. Analog to Digital Converter Block Schematic
The ADC converts an analog input voltage to a 10-bit digital value through successive approx-
imation. The minimum value represents GND and the maximum value represents the
reference voltage.The voltage reference for the ADC may be selected by writing to the
REFS1..0 bits in ADMUX. The VCC supply, the AREF pin or an internal 1.1V voltage refer-
ence may be selected as the ADC voltage reference.
The analog input channel and differential gain are selected by writing to the MUX5..0 bits in
ADMUX. Any of the eight ADC input pins ADC7..0 can be selected as single ended inputs to
the ADC. For differential measurements all analog inputs next to each other can be selected
as a input pair. Every input is also possible to measure with ADC3. These pairs of differential
inputs are measured by ADC trough the differential gain amplifier.
ADC7
ADC6
ADC5
ADC4
ADC3
ADC2
ADC1
ADC0
AREF
V
CC
TEMPERATURE
REFERENCE
INTERNAL
8-BIT DATA BUS
AGND
ADC CTRL. & STATUS B
SENSOR
REGISTER (ADCSRB)
1.1V
ADC8
INPUT
INPUT
NEG.
POS.
MUX
MUX
ADTS2...ADTS0
ADC MULTIPLEXER
SELECT (ADMUX)
MUX DECODER
+
-
GAIN
AMPLIFIER
SINGLE ENDED / DIFFERENTIAL SELECTION
10-BIT DAC
ADC CTRL. & STATUS A
REGISTER (ADCSRA)
ADC CONVERSION
COMPLETE IRQ
Atmel ATA5771/73/74
PRESCALER
CONVERSION LOGIC
INTERRUPT
TRIGGER
SELECT
FLAGS
SAMPLE & HOLD
COMPARATOR
15
+
-
ADC DATA REGISTER
(ADCH/ADCL)
ADC MULTIPLEXER
OUTPUT
0
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