AM3359, AM3358, AM3357
AM3356, AM3354, AM3352
SPRS717F –OCTOBER 2011–REVISED APRIL 2013
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Table 3-17. TSC_ADC Electrical Parameters (continued)
PARAMETER
CONDITION
MIN
NOM
MAX UNIT
Internal Voltage Reference:
VDDA_ADC = 1.8V
Spurious Free Dynamic
Range
External Voltage Reference:
VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
80
dB
Internal Voltage Reference:
VDDA_ADC = 1.8V
Signal-to-Noise Plus
Distortion
External Voltage Reference:
VREFP - VREFN = 1.8V
Input Signal: 30 kHz sine wave at
-0.5 dB Full Scale
69
20
dB
VREFP and VREFN Input Impedance
Input Impedance of
kΩ
f = input frequency
[1/((65.97 x 10-12) x f)]
Ω
AIN[7:0](2)
Sampling Dynamics
ADC
Clock
Cycles
Conversion Time
Acquisition Time
15
2
ADC
Clock
Cycles
Sampling Rate
ADC Clock = 3 MHz
200
100
kSPS
dB
Channel-to-Channel Isolation
Touchscreen Switch Drivers
Pull-Up and Pull-Down Switch ON Resistance (Ron)
2
Ω
Pull-Up and Pull-Down
Switch Current Leakage
Ileak
Source impedance = 500 Ω
0.5
uA
Drive Current
25
6
mA
kΩ
kΩ
Touchscreen Resistance
Pen Touch Detect
2
(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
Device Operating Conditions
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