AM4376 datasheet(112/261 Pages) TI

112 / 261 page

AM4376, AM4377, AM4378, AM4379

SPRS851B – JUNE 2014 – REVISED APRIL 2015

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5.8

ADC0: Touchscreen Controller and Analog-to-Digital Subsystem Electrical Parameters

The touchscreen controller (TSC) and analog-to-digital converter (ADC) subsystem (ADC0) contains a single-

channel ADC connected to an 8:1 analog multiplexer which operates as a general-purpose ADC with optional

support for interleaving TSC conversions for 4-wire, 5-wire, or 8-wire resistive panels. The ADC0 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 5-5 summarizes the ADC0 subsystem electrical parameters.

Table 5-5. ADC0 Electrical Parameters

PARAMETER

CONDITION

MIN

NOM

MAX

UNIT

ANALOG INPUT

(0.5 * VDDA_ADC0) +

ADC0_VREFP(1)

VDDA_ADC0

0.25

(0.5 * VDDA_ADC0) -

ADC0_VREFN(1)

0.25

ADC0_VREFP + ADC0_VREFN

VDDA_ADC0

Internal Voltage Reference

VDDA_ADC0

Full-scale Input Range

External Voltage Reference

ADC0_VREFN

ADC0_VREFP

Internal Voltage Reference:

Differential Nonlinearity

VDDA_ADC0 = 1.8 V

-1

0.5

LSB

(DNL)

External Voltage Reference:

VREFP - VREFN = 1.8 V

Source impedance = 50

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

-2

±1

External Voltage Reference:

VREFP - VREFN = 1.8 V

Integral Nonlinearity (INL)

LSB

Source Impedance = 1k

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

±1

External Voltage Reference:

VREFP - VREFN = 1.8 V

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

Gain Error

±2

LSB

External Voltage Reference:

VREFP - VREFN = 1.8 V

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

Offset Error

±2

LSB

External Voltage Reference:

VREFP - VREFN = 1.8 V

Input Sampling Capacitance

5.5

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

Signal-to-Noise Ratio

External Voltage Reference:

(SNR)

VREFP - VREFN = 1.8 V

Input Signal: 30 kHz sine wave at

-0.5 dB Full Scale

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

Total Harmonic Distortion

External Voltage Reference:

(THD)

VREFP - VREFN = 1.8 V

Input Signal: 30 kHz sine wave at

-0.5 dB Full Scale

112

Specifications

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