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SPRS717F –OCTOBER 2011–REVISED APRIL 2013
3.5 Touchscreen Controller and Analog-to-Digital Subsystem Electrical Parameters
The touchscreen controller (TSC) and analog-to-digital converter (ADC) subsystem (TSC_ADC) is an 8-channel
general-purpose ADC with optional support for interleaving TSC conversions for 4-wire, 5-wire, or 8-wire resistive
panels. The TSC_ADC subsystem can be configured for use in one of the following applications:
•
•
•
•
8 general-purpose ADC channels
4-wire TSC with 4 general-purpose ADC channels
5-wire TSC with 3 general-purpose ADC channels
8-wire TSC.
Table 3-17 summarizes the TSC_ADC subsystem electrical parameters.
Table 3-17. TSC_ADC Electrical Parameters
PARAMETER
Analog Input
CONDITION
MIN
NOM
MAX UNIT
(0.5 * VDDA_ADC) +
0.25
VREFP(1)
VDDA_ADC
V
(0.5 * VDDA_ADC) -
0.25
VREFN(1)
0
V
V
VREFP + VREFN(1)
VDDA_ADC
Internal Voltage Reference
External Voltage Reference
0
VDDA_ADC
VREFP
Full-scale Input Range
V
VREFN
Internal Voltage Reference:
VDDA_ADC = 1.8V
External Voltage Reference:
VREFP - VREFN = 1.8V
Differential Non-Linearity
(DNL)
-1
-2
0.5
±1
1
LSB
Source impedance = 50 Ω
Internal Voltage Reference:
VDDA_ADC = 1.8V
2
LSB
External Voltage Reference:
VREFP - VREFN = 1.8V
Integral Non-Linearity (INL)
Source Impedance = 1k Ω
Internal Voltage Reference:
VDDA_ADC = 1.8V
±1
±2
LSB
LSB
External Voltage Reference:
VREFP - VREFN = 1.8V
Internal Voltage Reference:
VDDA_ADC = 1.8V
External Voltage Reference:
VREFP - VREFN = 1.8V
Gain Error
Internal Voltage Reference:
VDDA_ADC = 1.8V
External Voltage Reference:
VREFP - VREFN = 1.8V
Offset Error
±2
LSB
pF
Input Sampling Capacitance
5.5
Internal Voltage Reference:
VDDA_ADC = 1.8V
Signal-to-Noise Ratio
(SNR)
External Voltage Reference:
VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
70
75
dB
dB
Internal Voltage Reference:
VDDA_ADC = 1.8V
External Voltage Reference:
VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
Total Harmonic Distortion
(THD)
Copyright © 2011–2013, Texas Instruments Incorporated
Device Operating Conditions
97
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