AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
SPRS717H –OCTOBER 2011–REVISED MAY 2015
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Table 5-16. TSC_ADC Electrical Parameters (continued)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
Internal voltage reference:
VDDA_ADC = 1.8 V
Spurious free dynamic External voltage reference:
80 dB
range VREFP – VREFN = 1.8 V
Input signal: 30-kHz sine wave at
–0.5-dB full scale
Internal voltage reference:
VDDA_ADC = 1.8 V
Signal-to-noise plus External voltage reference:
69 dB
distortion VREFP – VREFN = 1.8 V
Input signal: 30-kHz sine wave at
–0.5-dB full scale
VREFP and VREFN input impedance 20 kΩ
Input impedance of
ƒ = Input frequency [1 / ((65.97 × 10
–12
) × ƒ)] Ω
AIN[7:0]
(2)
Sampling Dynamics
ADC
Conversion time 15 clock
cycles
ADC
Acquisition time 2 clock
cycles
Sampling rate ADC clock = 3 MHz 200 kSPS
Channel-to-channel isolation 100 dB
Touch Screen Switch Drivers
Pull-up and pull-down switch ON resistance (Ron) 2 Ω
Pull-up and pull-down
Source impedance = 500 Ω 0.5 uA
switch current leakage Ileak
Drive current 25 mA
Touch screen resistance 6 kΩ
Pen touch detect 2 kΩ
(1) VREFP and VREFN must be tied to ground if the internal voltage reference is used.
(2) This parameter is valid when the respective AIN terminal is configured to operate as a general-purpose ADC input.
98 Specifications Copyright © 2011–2015, Texas Instruments Incorporated
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