Datasheet

TSC2101
SLAS392D JUNE 2003 REVISED MAY 2005
www.ti.com
4
ELECTRICAL CHARACTERISTICS
At +25°C, AVDD1, AVDD2, DRVDD, IOVDD = 3.3 V, BVDD = 3.9 V, DVDD = 1.8 V, V
ref
= 2.5 V, Fs (Audio) = 48 kHz, unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
TOUCH SCREEN
AUXILIARY ANALOG INPUT
Input voltage range 0 +VREF V
Input capacitance
AUX1/2 input selected as input by touch-screen
25 pF
Input leakage current
AUX1/2 input selected as input by touch screen
±1 µA
BATTERY MONITOR INPUTS
Input voltage range 0.5 6.0 V
Input leakage current Battery conversion not selected ±1 µA
Accuracy
Variation across temperature after system
calibration at 4 V battery voltage and room
temperature
±15 mV
TOUCH SCREEN A/D CONVERTER
Resolution Programmable: 8-, 10-,12-bits 8 12 Bits
No missing codes 12-Bit resolution 11 Bits
Integral nonlinearity 5 5 LSB
Offset error 6 6 LSB
Gain error 6 6 LSB
Noise 50 µVrms
VOLTAGE REFERENCE (VREF)
VREF output programmed = 2.5 V 2.3 2.5 2.7
V
Voltage range
VREF output programmed = 1.25 V 1.25
V
External reference 1.1 2.5 V
Reference drift Internal VREF = 1.25 V 50 ppm/°C
Current drain
Extra current drawn when the internal reference is
turned on.
750 µA
AUDIO CODEC
ADC DECIMATION FILTER CHARACTERISTICS
Filter gain from 0 to 0.39 Fs ±0.1 dB
Filter gain at 0.4125 Fs 0.25 dB
Filter gain at 0.45 Fs 3.0 dB
Filter gain at 0.5 Fs 17.5 dB
Filter gain from 0.55 Fs to 64 Fs 75 dB
Group delay 17/Fs sec