EM250-RCM-R Ember, EM250-RCM-R Datasheet - Page 99

• Manufacturer Part Number: EM250-RCM-R
• Description: EM250 RCM BOARD
• Manufacturer: Ember
• Type: Transceiver, 802.15.4/ZigBeer

Specifications of EM250-RCM-R

• Frequency: 2.4GHz
• For Use With/related Products: EM250
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 636-1023

Equation notes
Table 36 lists other specifications for the ADC Module not covered in Table 33.
Note: The signal-ended ADC measurements are limited in their range and only guaranteed for accuracy in
Calculation Type
Offset corrected
Offset and gain corrected using VREF,
normalized to VREF
Offset and gain corrected using VDD,
normalized to VDD
Parameter
VREF
VREF output current
VREF load capacitance
Minimum input voltage
Maximum input voltage
Single-ended signal range
Differential signal range
Common mode range
Input referred ADC offset
Input Impedance
When not taking a Sample
When taking a Sample
All N are 16-bit numbers.
N
N
in the
N
the
N
<<16 indicates a bit shift left by 16 bits.
When calculating the voltage of VDD_PADS (ADC_SEL = 4), V = (1/4) * VDD_PADS
When calculating the voltage of VDD (ADC_SEL = 5), V = (1/2) * VDD
X
VSS
VREF
VDD
is a sampling of the desired analog source.
the range 0 to VREF. The nature of the ADC's internal design allows for measurements outside of this
range (+/- 200mV), but the accuracy of such measurements are not guaranteed. The maximum input
voltage is of more interest to the differential sampling where a differential measurement might be
small, but a common mode can push the actual input voltage on one of the signals towards VDD.
ADC_DATA
is a sampling of ground. Due to the nature of the ADC's internal design, ground does not yield 0x0000
is a sampling of the regulated supply, VDD/2.
is a sampling of VREF. Due to the nature of the ADC's internal design, VREF does not yield 0xFFFF in
ADC_DATA
register. Instead, VREF yields a value closer to 2/3 of the range—for example, 0xA800.
register. Instead, ground yields a value closer to 1/3 of the range—for example, 0x5200.
Table 35. Offset and Gain Correction
Table 36. ADC Specifications
Page 99
N
N
Corrected Sample
=
N
=
(
(
N
=
2
N
(
×
N
(
X
X
N
(
VREF
−
−
N
X
VDD
N
N
−
VSS
VSS
−
N
−
N
)
)
VSS
N
<<
<<
- VREF
VSS
Min.
VSS
1.19
- 10
10
)
16
0
0
0
1
)
16
)
Typ.
1.2
Absolute Voltage
V
V
=
=
(
+ VREF
(
N
Max.
VREF
VREF
VREF
1.21
N
10
10
×
1
×
2
2
VREF
VDD
16
16
EM250
120-0082-000S
)
)
M Ohm
Unit
mA
mV
nF
V
V
V
V
V
V