LM3S808 Datasheet, PDF (387/416 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S808 Microcontroller
19.2.3
19.2.4
Parameter Parameter Name
Min Nom Max Unit
f_MOSC
Main oscillator frequency
1 - 8 MHz
t_{MOSC_per}
Main oscillator period
125 - 1000 ns
f_{ref_crystal_bypass}
Crystal reference using the main oscillator (PLL in BYPASS mode)
a
1
-
8 MHz
f_{ref_ext_bypass} External clock reference (PLL in BYPASS mode)^a
0 - 50 MHz
f_{system_clock}
System clock
0 - 50 MHz
a. The ADC must be clocked from the PLL or directly from a 14-MHz to 18-MHz clock source to operate properly.
Analog-to-Digital Converter
Table 19-8. ADC Characteristics
Parameter Parameter Name
Min Nom Max Unit
V_ADCIN
Maximum single-ended, full-scale analog input voltage - - 3.0
V
Minimum single-ended, full-scale analog input voltage - - 0
V
Maximum differential, full-scale analog input voltage - - 1.5
V
Minimum differential, full-scale analog input voltage
- - -1.5
V
C_ADCIN
N
Equivalent input capacitance
Resolution
-1 -
pF
- 10 -
bits
f_ADC
t_ADCCONV
f _ADCCONV
INL
ADC internal clock frequency
Conversion time
Conversion rate
Integral nonlinearity
78 9
MHz
-
- 16 t_ADCcycles^a
438 500 563 k samples/s
- - ±1
LSB
DNL
Differential nonlinearity
- - ±1
LSB
OFF
Offset
- - ±1
LSB
GAIN
Gain
- - ±1
LSB
a. t_ADC= 1/f_{ADC clock}
Analog Comparator
Table 19-9. Analog Comparator Characteristics
Parameter Parameter Name
Min Nom Max Unit
V_OS
V_CM
C_MRR
T_RT
T_MC
Input offset voltage
- ±10 ±25 mV
Input common mode voltage range
Common mode rejection ratio
0 - V_DD-1.5 V
50 -
- dB
Response time
--
1 µs
Comparator mode change to Output Valid - -
10 µs
Table 19-10. Analog Comparator Voltage Reference Characteristics
Parameter Parameter Name
Min Nom Max Unit
R_HR Resolution high range
- V_DD/32 - LSB
R_LR Resolution low range
- V_DD/24 - LSB
A_HR Absolute accuracy high range -
- ±1/2 LSB
A_LR Absolute accuracy low range -
- ±1/4 LSB
October 01, 2007
387
Preliminary