LM3S3748 Datasheet, PDF (696/753 Pages) List of Unclassifed Manufacturers – Microcontroller

Electrical Characteristics
24.2.3
24.2.4
24.2.5
Analog-to-Digital Converter
Table 24-11. ADC Characteristics^a
Parameter Parameter Name
Min Nom Max Unit
V_ADCIN
Maximum single-ended, full-scale analog input voltage -
Minimum single-ended, full-scale analog input voltage -
- 3.0 V
- 0V
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
- 10
- pF
- bits
f_ADC
t_ADCCONV
f _ADCCONV
INL
ADC internal clock frequency
Conversion time
Conversion rate
Integral nonlinearity
14 16 18 MHz
-
-
16 t_ADCcycles^b
875 1000 1125 k samples/s
- - ±1 LSB
DNL
Differential nonlinearity
- - ±1 LSB
OFF
Offset
- - ±1 LSB
GAIN
Gain
- - ±1 LSB
a. The ADC reference voltage is 3.0 V. This reference voltage is internally generated from the 3.3 VDDA supply by a band
gap circuit.
b. t_ADC= 1/f_{ADC clock}
Analog Comparator
Table 24-12. 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 24-13. 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
I²C
Table 24-14. I²C Characteristics
Parameter No. Parameter Parameter Name
I1^a
t_SCH Start condition hold time
I2^a
t_LP
Clock Low period
Min Nom Max
Unit
36 -
-
system clocks
36 -
-
system clocks
696
April 08, 2008
Preliminary