AM4376 datasheet(113/261 Pages) TI

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AM4376, AM4377, AM4378, AM4379

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SPRS851B – JUNE 2014 – REVISED APRIL 2015

Table 5-5. ADC0 Electrical Parameters (continued)

PARAMETER

CONDITION

MIN

NOM

MAX

UNIT

Internal Voltage Reference:

VDDA_ADC0 = 1.8 V

Spurious Free Dynamic

External Voltage Reference:

Range

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

Signal-to-Noise Plus

External Voltage Reference:

Distortion

VREFP - VREFN = 1.8 V

Input Signal: 30 kHz sine wave at

-0.5 dB Full Scale

VREFP and VREFN Input Impedance

Input Impedance of

f = input frequency

[1/((65.97 x 10-12) x f)]

AIN[7:0](2)

SAMPLING DYNAMICS

ADC Clock Frequency

MHz

ADC0

Conversion Time

clock

cycles

ADC0

Acquisition Time

257

clock

cycles

Sampling Rate(3)

ADC0 Clock = 13 MHz

867

kSPS

Channel-to-Channel Isolation

100

TOUCHSCREEN SWITCH DRIVERS

Pullup and Pulldown Switch ON-Resistance (Ron)

Pullup and Pulldown Switch

Source impedance = 500

0.5

Current Leakage Ileak

Drive Current

Touchscreen Resistance

Pen Touch Detect

(1) The ADC0_VREFP and ADC0_VREFN terminals should not be allowed to float to prevent noise from coupling into the ADC. If

ADC0_VREFN is not used to connect an external negative voltage reference to the ADC, connect it to VSSA_ADC. If ADC0_VREFP is

not used to connect an external positive voltage reference to the ADC, connect it to VSSA_ADC or VDDA_ADC0. Connecting

ADC0_VREFP to VSSA_ADC in this use case is the preferred option because VDDA_ADC0 may couple more noise into the ADC than

VSSA_ADC.

(2) This parameter is valid when the respective AIN terminal is configured to operate as a general-purpose ADC input.

(3) The maximum sample rate assumes a conversion time of 13 ADC clock cycles with the acquisition time configured for the minimum of 2

ADC clock cycles, where it takes a total of 15 ADC clock cycles to sample the analog input and convert it to a positive binary weighted

digital value.

Specifications

113

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