NRF9E5 NORDIC SEMICONDUCTOR, NRF9E5 Datasheet - Page 31

• Manufacturer Part Number: NRF9E5
• Description: TRX, 430-928MHZ, MCU/ADC/PWM, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF9E5

• Receiving Current: 12.5mA
• Transmitting Current: 30mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
10.2 AD Converter Usage
10.2.1 Measurements with External Reference
When VFSSEL is set to 1 and CHSEL selects an input AINi (i.e. AIN0 to AIN3), the
result in ADCDATA is directly proportional to the ratio between the voltage on the
selected input, and the voltage on pin AREF:
and for differential measurements a similar equation apply:
Where N is the number of bits set in RESCTRL
This mode of operation is normally selected for sources where the voltage is depending
on the supply voltage (or another variable voltage), as shown in Figure 7 below. The
resistor R1 is selected to keep AREF ≤ 1.5V for the maximum VDD voltage.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.3
Figure 7 Typical use of AD with 2 ratiometric inputs.
V
R
2
AINi
V
R
1
V
AIN
AINi
0
R
3
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V
V
AREF
AREF
ADCDATA
ADCDATA
2
ARE
AIN
AIN
N
1
0
F
SUPPL
VDD
nRF9E5
2
Y
N
2
(
N
) 1
June 2006