Datasheet

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AM3359, AM3358, AM3357
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SPRS717E –OCTOBER 2011–REVISED JANUARY 2013 www.ti.com
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 3-15 summarizes the TSC_ADC subsystem electrical parameters.
Table 3-15. TSC_ADC Electrical Parameters
PARAMETER CONDITION 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 = 1.8V
-1 0.5 1 LSB
(DNL) External Voltage Reference:
VREFP - VREFN = 1.8V
Source impedance = 50 Ω
Internal Voltage Reference:
VDDA_ADC = 1.8V -2 ±1 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 LSB
External Voltage Reference:
VREFP - VREFN = 1.8V
Internal Voltage Reference:
VDDA_ADC = 1.8V
Gain Error ±2 LSB
External Voltage Reference:
VREFP - VREFN = 1.8V
Internal Voltage Reference:
VDDA_ADC = 1.8V
Offset Error ±2 LSB
External Voltage Reference:
VREFP - VREFN = 1.8V
Input Sampling Capacitance 5.5 pF
Internal Voltage Reference:
VDDA_ADC = 1.8V
Signal-to-Noise Ratio External Voltage Reference:
70 dB
(SNR) VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
Internal Voltage Reference:
VDDA_ADC = 1.8V
Total Harmonic Distortion External Voltage Reference:
75 dB
(THD) VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
94 Device Operating Conditions Copyright © 2011–2013, Texas Instruments Incorporated
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