AMIC110 Datasheet, PDF (87/214 Pages) Texas Instruments – Sitara Processors

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AMIC110
SPRS971A – AUGUST 2016 – REVISED SEPTEMBER 2016
Table 5-16. TSC_ADC Electrical Parameters (continued)
PARAMETER
TEST CONDITIONS
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
Spurious free dynamic
range
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
Signal-to-noise plus
distortion
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
VREFP and VREFN input impedance
Input impedance of
AIN[7:0]⁽²⁾
ƒ = Input frequency
Sampling Dynamics
MIN
NOM
75
80
69
20
[1 / ((65.97 × 10^–12) × ƒ)]
Conversion time
15
Acquisition time
2
Sampling rate
ADC clock = 3 MHz
200
Channel-to-channel isolation
100
Touch Screen Switch Drivers
Pullup and pulldown switch ON resistance (Ron)
2
Pullup and pulldown switch
current leakage Ileak
Source impedance = 500 Ω
Drive current
Touch screen resistance
Pen touch detect
(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.
MAX UNIT
dB
dB
dB
kΩ
Ω
ADC
clock
cycles
ADC
clock
cycles
kSPS
dB
Ω
0.5 uA
25 mA
6 kΩ
2 kΩ
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Specifications
87