2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
ABSOLUTE MAXIMUM RATINGS
Continuous Power Dissipation (T = +70°C)
A
V
DD
, VBAT, DIN, CS, DCLK to GND ........................-0.3V to +6V
16-Pin QSOP (derate 8.30mW/°C above +70°C).........667mW
16-Pin TSSOP (derate 5.70mW/°C above +70°C) .......456mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Digital Outputs to GND...............................-0.3V to (V
+ 0.3V)
+ 0.3V)
DD
DD
V
, X+, X-, Y+, Y-, AUX to GND..............-0.3V to (V
REF
Maximum Current into Any Pin ......................................... 50mA
Maximum ESD per IEC-61000-4-2 (per MIL STD-883 HBM)
X+, X-, Y+, Y-, VBAT, AUX......................................15kV (4kV)
All Other Pins ..........................................................2kV (500V)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= 2.7V to 3.6V, V
= 2.5V, f
= 2MHz (50% duty cycle), f
= 125kHz, 12-bit mode, 0.1µF capacitor at REF, T =
SAMPLE A
DD
REF
DCLK
T
MIN
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
12
UNITS
DC ACCURACY (Note 1)
Resolution
Bits
Bits
LSB
LSB
LSB
LSB
No Missing Codes
Relative Accuracy
Differential Nonlinearity
Offset Error
11
12
1
INL
(Note 2)
(Note 3)
2
DNL
1
6
4
Gain Error
Noise
Including internal reference
70
µV
RMS
CONVERSION RATE
Conversion Time
Track/Hold Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
t
12 clock cycles (Note 4)
3 clock cycles
6
µs
µs
CONV
t
1.5
ACQ
f
16 clock conversion
125
kHz
ns
SAMPLE
500
30
ns
Aperture Jitter
100
100
ps
Channel-to-Channel Isolation
Serial Clock Frequency
Duty Cycle
V
= 2.5V
at 50kHz
dB
MHz
%
IN
P-P
f
0.1
40
2.0
60
DCLK
ANALOG INPUT (X+, X-, Y+, Y-, AUX)
Input Voltage Range
0
V
V
REF
1
Input Capacitance
25
pF
µA
Input Leakage Current
SWITCH DRIVERS
On/off leakage, V = 0 to V
IN
0.1
DD
Y+, X+
Y-, X-
7
9
On-Resistance (Note 5)
Ω
INTERNAL REFERENCE
Reference Output Voltage
V
V
= 2.7V to 5.25V, T = +25°C
2.45
2.50
50
2.55
V
REF
DD
A
REF Output Tempco
TCV
ppm°/C
mA
REF
REF Short-Circuit Current
REF Output Impedance
18
250
Ω
2
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