MXB7846(2004) Ver la hoja de datos (PDF) - Maxim Integrated

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MXB7846
(Rev.:2004)

2.375V to 5.25V, 4-Wire Touch-Screen Controller with Internal Reference and Temperature Sensor

Maxim Integrated 

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

with Internal Reference and Temperature Sensor

ABSOLUTE MAXIMUM RATINGS

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

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

(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

12

Bits

No Missing Codes

11

12

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

CONVERSION RATE

Including internal reference

70

µVRMS

Conversion Time

Track/Hold Acquisition Time

Throughput Rate

Multiplexer Settling Time

tCONV

tACQ

fSAMPLE

12 clock cycles (Note 4)

3 clock cycles

16 clock conversion

6

µs

1.5

µs

125

kHz

500

ns

Aperture Delay

30

ns

Aperture Jitter

100

ps

Channel-to-Channel Isolation

Serial Clock Frequency

fDCLK

VIN = 2.5VP-P at 50kHz

100

dB

0.1

2.0

MHz

Duty Cycle

40

60

%

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

Input Voltage Range

Input Capacitance

0

VREF

V

25

pF

Input Leakage Current

SWITCH DRIVERS

On/off leakage, VIN = 0 to VDD

±0.1

±1

µA

On-Resistance (Note 5)

Y+, X+

Y-, X-

7

Ω

9

INTERNAL REFERENCE

Reference Output Voltage

REF Output Tempco

VREF VDD = 2.7V to 5.25V, TA = +25°C

TCVREF

2.45 2.50 2.55

V

50

ppm°/C

REF Short-Circuit Current

18

mA

REF Output Impedance

250

Ω

2 _______________________________________________________________________________________

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