AM3359 datasheet(97/236 Pages) TI

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AM3359, AM3358, AM3357

AM3356, AM3354, AM3352

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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

CONDITION

MIN

NOM

MAX

UNIT

Analog Input

(0.5 * VDDA_ADC) +

VREFP(1)

VDDA_ADC

0.25

(0.5 * VDDA_ADC) -

VREFN(1)

0.25

VREFP + VREFN(1)

VDDA_ADC

Internal Voltage Reference

VDDA_ADC

Full-scale Input Range

External Voltage Reference

VREFN

VREFP

Internal Voltage Reference:

Differential Non-Linearity

VDDA_ADC = 1.8V

-1

0.5

LSB

(DNL)

External Voltage Reference:

VREFP - VREFN = 1.8V

Source impedance = 50

Internal Voltage Reference:

VDDA_ADC = 1.8V

-2

±1

LSB

External Voltage Reference:

VREFP - VREFN = 1.8V

Integral Non-Linearity (INL)

Source Impedance = 1k

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

Internal Voltage Reference:

VDDA_ADC = 1.8V

Signal-to-Noise Ratio

External Voltage Reference:

(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:

(THD)

VREFP - VREFN = 1.8V

Input Signal: 30 kHz sine wave at

-0.5 dB Full Scale

Device Operating Conditions

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