AM3351 datasheet(96/252 Pages) TI1

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AM3359, AM3358, AM3357, AM3356, AM3354, AM3352, AM3351

SPRS717J – OCTOBER 2011 – REVISED APRIL 2016

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Specifications

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

VREFP(1)

(0.5 × VDDA_ADC) +

0.25

VDDA_ADC

VREFN(1)

(0.5 × VDDA_ADC) –

0.25

VREFP + VREFN(1)

VDDA_ADC

Full-scale input range

Internal voltage reference

VDDA_ADC

External voltage reference

VREFN

VREFP

Differential nonlinearity

(DNL)

Internal voltage reference:

VDDA_ADC = 1.8 V

External voltage reference:

VREFP – VREFN = 1.8 V

–1

0.5

LSB

Integral nonlinearity (INL)

Source impedance = 50 Ω

Internal voltage reference:

VDDA_ADC = 1.8 V

External voltage reference:

VREFP – VREFN = 1.8 V

–2

±1

LSB

Source impedance = 1 kΩ

Internal voltage reference:

VDDA_ADC = 1.8 V

External voltage reference:

VREFP – VREFN = 1.8 V

±1

Gain error

Internal voltage reference:

VDDA_ADC = 1.8 V

External voltage reference:

VREFP – VREFN = 1.8 V

±2

LSB

Offset error

Internal voltage reference:

VDDA_ADC = 1.8 V

External voltage reference:

VREFP – VREFN = 1.8 V

±2

LSB

Input sampling capacitance

5.5

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

Total harmonic distortion

(THD)

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

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