EFM32LG332F256 Energy Micro, EFM32LG332F256 Datasheet - Page 30

• Manufacturer Part Number: EFM32LG332F256
• Description: ARM Microcontrollers - MCU 256KB FL 32KB RAM
• Manufacturer: Energy Micro
• Series: EFM32LG332r

Specifications of EFM32LG332F256

• Rohs: yes
• Core: ARM Cortex M3
• Processor Series: EFM32
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 48 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 32 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.85 V to 3.8 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFP-64
• Mounting Style: SMD/SMT
• Interface Type: I2C, I2S, SPI, UART, USART
• Length: 10 mm

2012-09-11 - EFM32LG332FXX - d0111_Rev1.00
1
the set {-3, -2, -1, 1, 2, 3}. There will be no missing code around 2048, and in spite of the missing code the ADC will be monotonic
at all times so that a response to a slowly increasing input will always be a slowly increasing output. Around the one code that is
missing, the neighbour codes will look wider in the DNL plot. The spectra will show spurs on the level of -78dBc for a full scale
input for chips that have the missing code issue.
2
3
The integral non-linearity (INL) and differential non-linearity parameters are explained in Figure 3.13 (p.
30) and Figure 3.14 (p. 31) , respectively.
Figure 3.13. Integral Non-Linearity (INL)
On the average every ADC will have one missing code, most likely to appear around 2048 +/- n*512 where n can be a value in
Typical numbers given by abs(Mean) / (85 - 25).
Max number given by (abs(Mean) + 3x stddev) / (85 - 25).
Symbol
V
TGRAD
DNL
INL
MC
GAIN
OFFSET
ADCOFFSET
ADC
ADC
ADC
ED
ADCTH
ED
Parameter
Offset voltage
Thermometer output gradi-
ent
Differential non-linearity
(DNL)
Integral non-linearity (INL),
End point method
No missing codes
Gain error drift
Offset error drift
Digit al ouput code
4095
4094
4093
4092
3
2
1
0
Act ual ADC
t ranfer funct ion
before offset and
gain correct ion
Preliminary
INL= |[ (V
Condition
200 kSamples/s, 12 bit, differ-
ential, 2xV
After calibration, single ended
After calibration, differential
1.25V reference
2.5V reference
1.25V reference
2.5V reference
D
-V
Ideal t ransfer
curve
SS
)/V
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DD
V
LSBIDEAL
30
OFFSET
reference
] - D| where 0 < D < 2
INL Error
(End Point INL)
Act ual ADC
t ranfer funct ion
aft er offset and
gain correct ion
Min
11.999
Analog Input
1
Typ
N
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- 1
0.01
0.01
-1.92
±0.7
±1.2
0.2
0.2
-6.3
0.3
0.3
79
12
2
2
2
2
Max
0.033
0.03
0.62
0.7
3
3
3
3
Unit
dBc
mV
mV
mV/°C
ADC
Codes/
°C
LSB
LSB
bits
%/°C
%/°C
LSB/°C
LSB/°C