LM3S9B81 Datasheet, PDF (1096/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Electrical Characteristics
Figure 25-17. ADC Input Equivalency Diagram
VDD
ESD
Clamp
R_ADC
V_IN
ESD
Clamp
I_L
Stellaris® Microcontroller
10-bit
converter
C_ADC
Sample and hold
ADC converter
25.2.9
Table 25-25. ADC Module External Reference Characteristics^a
Parameter Parameter Name
Min
Nom
Max
Unit
V_REFA
External voltage reference for ADC^b
2.4
-
V_DD
V
I_L
External voltage reference leakage current
-
±1.0
-
µA
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.
Table 25-26. ADC Module Internal Reference Characteristics
Parameter
V_REFI
E_IR
Parameter Name
Internal voltage reference for ADC
Internal voltage reference error
Min
Nom
Max
Unit
-
3.0
-
V
-
-
±2.5
%
Synchronous Serial Interface (SSI)
Table 25-27. SSI Characteristics
Parameter
No.
S1
S2
S3
S4
S5
S6
S7
S8
S9
Parameter Parameter Name
Min
t_{CLK_PER} SSIClk cycle time
2
t_{CLK_HIGH} SSIClk high time
-
t_{CLK_LOW} SSIClk low time
-
t_CLKRF
SSIClk rise/fall time
-
t_DMD
Data from master valid delay time 0
t_DMS
Data from master setup time
1
t_DMH
Data from master hold time
2
t_DSS
Data from slave setup time
1
t_DSH
Data from slave hold time
2
Nom
-
0.5
0.5
7.4
-
-
-
-
-
Max
65024
-
-
26
1
-
-
-
-
Unit
system clocks
t clk_per
t clk_per
ns
system clocks
system clocks
system clocks
system clocks
system clocks
1096
Texas Instruments-Advance Information
June 29, 2010