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SPRS717H –OCTOBER 2011–REVISED MAY 2015
5.10 Touch Screen Controller and Analog-to-Digital Subsystem Electrical Parameters
The touch screen 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 5-16 summarizes the TSC_ADC subsystem electrical parameters.
Table 5-16. TSC_ADC Electrical Parameters
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
Analog Input
(0.5 × VDDA_ADC) +
VREFP
(1)
VDDA_ADC V
0.25
(0.5 × VDDA_ADC) –
VREFN
(1)
0 V
0.25
VREFP + VREFN
(1)
VDDA_ADC V
Internal voltage reference 0 VDDA_ADC
Full-scale input range V
External voltage reference VREFN VREFP
Internal voltage reference:
Differential non-linearity VDDA_ADC = 1.8 V
–1 0.5 1 LSB
(DNL) External voltage reference:
VREFP – VREFN = 1.8 V
Source impedance = 50 Ω
Internal voltage reference:
VDDA_ADC = 1.8 V –2 ±1 2 LSB
External voltage reference:
VREFP – VREFN = 1.8 V
Integral non-linearity (INL)
Source impedance = 1 kΩ
Internal voltage reference:
VDDA_ADC = 1.8 V ±1 LSB
External voltage reference:
VREFP – VREFN = 1.8 V
Internal voltage reference:
VDDA_ADC = 1.8 V
Gain error ±2 LSB
External voltage reference:
VREFP – VREFN = 1.8 V
Internal voltage reference:
VDDA_ADC = 1.8 V
Offset error ±2 LSB
External voltage reference:
VREFP – VREFN = 1.8 V
Input sampling capacitance 5.5 pF
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
Signal-to-noise ratio (SNR) 70 dB
VREFP – VREFN = 1.8 V
Input signal: 30-kHz sine wave at
–0.5-dB full scale
Internal voltage reference:
VDDA_ADC = 1.8 V
Total harmonic distortion External voltage reference:
75 dB
(THD) VREFP – VREFN = 1.8 V
Input signal: 30-kHz sine wave at
–0.5-dB full scale
Copyright © 2011–2015, Texas Instruments Incorporated Specifications 97
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