SPRS971D August 2016 – March 2020 AMIC110
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
NOTE
The touch screen controller (TSC) function is not supported for this family of devices.
The touch screen controller (TSC) and analog-to-digital converter (ADC) subsystem (TSC_ADC) is an 8-channel general-purpose ADC with optional support for interleaving TSC conversions for 4-wire, 5-wire, or 8-wire resistive panels. The TSC_ADC subsystem can be configured for use in one of the following applications:
Table 5-16 summarizes the TSC_ADC subsystem electrical parameters.
PARAMETER | TEST CONDITIONS | MIN | NOM | MAX | UNIT |
---|---|---|---|---|---|
Analog Input | |||||
VREFP(1) | (0.5 × VDDA_ADC) + 0.25 | VDDA_ADC | V | ||
VREFN(1) | 0 | (0.5 × VDDA_ADC) – 0.25 | V | ||
VREFP + VREFN(1) | VDDA_ADC | V | |||
Full-scale input range | Internal voltage reference | 0 | VDDA_ADC | V | |
External voltage reference | VREFN | VREFP | |||
Differential nonlinearity (DNL) | Internal voltage reference:
VDDA_ADC = 1.8 V External voltage reference: VREFP – VREFN = 1.8 V |
–1 | 0.5 | 1 | LSB |
Integral nonlinearity (INL) | Source impedance = 50 Ω
Internal voltage reference: VDDA_ADC = 1.8 V External voltage reference: VREFP – VREFN = 1.8 V |
–2 | ±1 | 2 | LSB |
Source impedance = 1 kΩ
Internal voltage reference: VDDA_ADC = 1.8 V External voltage reference: VREFP – VREFN = 1.8 V |
±1 | ||||
Gain error | Internal voltage reference:
VDDA_ADC = 1.8 V External voltage reference: VREFP – VREFN = 1.8 V |
±2 | LSB | ||
Offset error | Internal voltage reference:
VDDA_ADC = 1.8 V External voltage reference: VREFP – VREFN = 1.8 V |
±2 | LSB | ||
Input sampling capacitance | 5.5 | pF | |||
Signal-to-noise ratio (SNR) | 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 |
70 | dB | ||
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 |
75 | dB | ||
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 |
80 | dB | ||
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 |
69 | dB | ||
VREFP and VREFN input impedance | 20 | kΩ | |||
Input impedance of AIN[7:0](2) | ƒ = Input frequency | [1 / ((65.97 × 10–12) × ƒ)] | Ω | ||
Sampling Dynamics | |||||
ADC clock frequency | 1 | 3 | MHz | ||
Conversion time | 13 | ADC clock cycles | |||
Acquisition time | 2 | 257 | ADC clock cycles | ||
Sampling rate | 200 | kSPS | |||
Channel-to-channel isolation | 100 | dB | |||
Touch Screen Switch Drivers | |||||
Pullup and pulldown switch ON resistance (Ron) | 2 | Ω | |||
Pullup and pulldown switch current leakage Ileak | Source impedance = 500 Ω | 0.5 | uA | ||
Drive current | 25 | mA | |||
Touch screen resistance | 6 | kΩ | |||
Pen touch detect | 2 | kΩ |