Texas Instruments TM4C1294NCPDT User Manual

27.21 Analog Comparator
Table 27-58. Analog Comparator Characteristics
ab
UnitMaxNomMinParameter NameParameter
VV
DDA
-GNDAInput voltage rangeV
INP
,V
INN
c
VV
DDA
-GNDAInput common mode voltage rangeV
CM
mV±50
d
±10-Input offset voltageV
OS
µA2.0--Input leakage current over full voltage rangeI
INP
,I
INN
dB-50-Common mode rejection ratioC
MRR
µs1.0
e
--Response timeT
RT
µs10--Comparator mode change to Output ValidT
MC
a. Best design practices suggest that static or quiet digital I/O signals be configured adjacent to sensitive analog inputs to
reduce capacitive coupling and cross talk.
b. To achieve best analog results, the source resistance driving the analog inputs, V
INP
and V
INN
, should be kept low.
c. The external voltage inputs to the Analog Comparator are designed to be highly sensitive and can be affected by external
noise on the board. For this reason, V
INP
and V
INN
must be set to different voltage levels during idle states to ensure the
analog comparator triggers are not enabled. If an internal voltage reference is used, it should be set to a mid-supply
level. When operating in Sleep/Deep-Sleep modes, the Analog Comparator module should be disabled or the external
voltage inputs set to different levels (greater than the input offset voltage) to achieve minimum current draw.
d. Measured at VREF=100 mV.
e. Measured at external VREF=100 mV, input signal switching from 75 mV to 125 mV.
Table 27-59. Analog Comparator Voltage Reference Characteristics
UnitMaxNomMinParameter NameParameter
V-V
DDA
/29.4-Resolution in high rangeR
HR
V-V
DDA
/22.12-Resolution in low rangeR
LR
V±R
HR
/2--Absolute accuracy high rangeA
HR
V±R
LR
/2--Absolute accuracy low rangeA
LR
Table 27-60. Analog Comparator Voltage Reference Characteristics, V
DDA
= 3.3V, EN= 1, and
RNG = 0
UnitV
IREF
MaxIdeal V
IREF
V
IREF
MinVREF Value
V0.8410.7860.7310x0
V0.9530.8980.8430x1
V1.0651.0100.9550x2
V1.1781.1221.0670x3
V1.2901.2351.1800x4
V1.4021.3471.2920x5
V1.5141.4591.4040x6
V1.6271.5711.5160x7
V1.7391.6841.6290x8
V1.8511.7961.7410x9
V1.9631.9081.8530xA
V2.0762.0201.9650xB
V2.1882.1332.0780xC
1877June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller

Texas Instruments TM4C1294NCPDT Specifications

General

Brand	Texas Instruments
Model	TM4C1294NCPDT
Category	Microcontrollers
Language	English