MXB7846EEE datasheet(2/23 Pages) MAXIM

2 / 23 page

2.375V to 5.25V, 4-Wire Touch-Screen Controller

with Internal Reference and Temperature Sensor

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

VDD, VBAT, DIN, CS, DCLK to GND ........................-0.3V to +6V

Digital Outputs to GND...............................-0.3V to (VDD + 0.3V)

VREF, X+, X-, Y+, Y-, AUX to GND..............-0.3V to (VDD + 0.3V)

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)

Continuous Power Dissipation (TA = +70°C)

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

ELECTRICAL CHARACTERISTICS

(VDD = 2.7V to 3.6V, VREF = 2.5V, fDCLK = 2MHz (50% duty cycle), fSAMPLE = 125kHz, 12-bit mode, 0.1µF capacitor at REF, TA =

TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DC ACCURACY (Note 1)

Resolution

Bits

No Missing Codes

Bits

Relative Accuracy

INL

(Note 2)

±1

±2

LSB

Differential Nonlinearity

DNL

±1

LSB

Offset Error

±6

LSB

Gain Error

(Note 3)

±4

LSB

Noise

Including internal reference

µVRMS

CONVERSION RATE

Conversion Time

tCONV

12 clock cycles (Note 4)

µs

Track/Hold Acquisition Time

tACQ

3 clock cycles

1.5

µs

Throughput Rate

fSAMPLE

16 clock conversion

125

kHz

Multiplexer Settling Time

500

Aperture Delay

Aperture Jitter

100

Channel-to-Channel Isolation

VIN = 2.5VP-P at 50kHz

100

Serial Clock Frequency

fDCLK

0.1

2.0

MHz

Duty Cycle

ANALOG INPUT (X+, X-, Y+, Y-, AUX)

Input Voltage Range

0VREF

Input Capacitance

Input Leakage Current

On/off leakage, VIN = 0 to VDD

±0.1

±1

µA

SWITCH DRIVERS

Y+, X+

On-Resistance (Note 5)

Y-, X-

Ω

INTERNAL REFERENCE

Reference Output Voltage

VREF

VDD = 2.7V to 5.25V, TA = +25°C

2.45

2.50

2.55

REF Output Tempco

TCVREF

ppm°/C

REF Short-Circuit Current

REF Output Impedance

250

Ω

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