AMIC110 Datasheet, PDF (86/214 Pages) Texas Instruments – Sitara Processors

AMIC110
SPRS971A – AUGUST 2016 – REVISED SEPTEMBER 2016
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5.10 Touch Screen Controller and Analog-to-Digital Subsystem Electrical Parameters
NOTE
The touch screen controller (TSC) function is not supported for this family of devices.
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
Analog Input
VREFP⁽¹⁾
TEST CONDITIONS
VREFN⁽¹⁾
VREFP + VREFN⁽¹⁾
Full-scale input range
Internal voltage reference
External voltage reference
Differential nonlinearity
(DNL)
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
VREFP – VREFN = 1.8 V
Integral nonlinearity (INL)
Source impedance = 50 Ω
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
VREFP – VREFN = 1.8 V
Source impedance = 1 kΩ
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
VREFP – VREFN = 1.8 V
Gain error
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
VREFP – VREFN = 1.8 V
Offset error
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
VREFP – VREFN = 1.8 V
Input sampling capacitance
Signal-to-noise ratio (SNR)
Internal voltage reference:
VDDA_ADC = 1.8 V
External voltage reference:
VREFP – VREFN = 1.8 V
Input signal: 30-kHz sine wave at
–0.5-dB full scale
MIN
NOM
(0.5 × VDDA_ADC) +
0.25
0
0
VREFN
VDDA_ADC
–1
0.5
–2
±1
±1
±2
±2
5.5
70
MAX UNIT
VDDA_ADC V
(0.5 × VDDA_ADC) –
0.25
V
V
VDDA_ADC
V
VREFP
1 LSB
2
LSB
LSB
LSB
pF
dB
86
Specifications
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