Datasheet
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SPRS717E –OCTOBER 2011–REVISED JANUARY 2013
Table 3-15. TSC_ADC Electrical Parameters (continued)
PARAMETER CONDITION MIN NOM MAX UNIT
Internal Voltage Reference:
VDDA_ADC = 1.8V
Spurious Free Dynamic External Voltage Reference:
80 dB
Range VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
Internal Voltage Reference:
VDDA_ADC = 1.8V
Signal-to-Noise Plus External Voltage Reference:
69 dB
Distortion VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
VREFP and VREFN Input Impedance 20 kΩ
Input Impedance of
f = input frequency [1/((65.97 x 10
-12
) x f)] 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
Touchscreen Switch Drivers
Pull-Up and Pull-Down Switch ON Resistance (Ron) 2 Ω
Pull-Up and Pull-Down
Switch Current Leakage Source impedance = 500 Ω 0.5 uA
Ileak
Drive Current 25 mA
Touchscreen 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.
Copyright © 2011–2013, Texas Instruments Incorporated Device Operating Conditions 95
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