LM3S5C36 Datasheet, PDF (1015/1068 Pages) Texas Instruments – Stellaris® LM3S5C36 Microcontroller

Stellaris^® LM3S5C36 Microcontroller
Table 24-22. ADC Characteristics (continued)
Parameter Parameter Name
Min
Nom
Max
Unit
Full-scale gain error, 12-bit mode
E_G
Full-scale gain error, 10-bit mode
-
-
±100
LSB
-
-
±25
LSB
E_TS
Temperature sensor accuracy^d
-
-
±5
°C
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. The ADC must be clocked from the PLL or directly from an external clock source to operate properly.
c. The conversion time and rate scale from the specified number if the ADC internal clock frequency is any value other than
16 MHz.
d. Note that this parameter does not include ADC error.
Figure 24-13. ADC Input Equivalency Diagram
VDD
Stellaris® Microcontroller
ESD
Clamp
R_ADC
12-bit
converter
V_IN
ESD
Clamp
I_L
C_ADC
Sample and hold
ADC converter
Table 24-23. ADC Module External Reference Characteristics^a
Parameter Parameter Name
Min
External voltage reference for ADC, when the VREF field 2.97
in the ADCCTL register is 0x1^b
V_REFA
External voltage reference for ADC, when the VREF field
0.99
in the ADCCTL register is 0x3^c
I_L
External voltage reference leakage current
-
a. Care must be taken to supply a reference voltage of acceptable quality.
b. Ground is always used as the reference level for the minimum conversion value.
c. Ground is always used as the reference level for the minimum conversion value.
Nom
-
-
-
Table 24-24. ADC Module Internal Reference Characteristics
Parameter
V_REFI
Parameter Name
Internal voltage reference for ADC
Min
Nom
-
3.0
Max
3.03
1.01
2.0
Max
-
Unit
V
V
µA
Unit
V
January 23, 2012
Texas Instruments-Production Data
1015