±15kV ESD-Protected Touch-Screen

Controllers Include DAC and Keypad Controller

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5

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Capacitance

15

pF

DIGITAL OUTPUT (DOUT)

0.4

Output Voltage Low

0.8

V

Output Voltage High

0.5

V

DIGITAL OUTPUT (BUSY, PENIRQ, KEYIRQ, R_, C_)

Output Voltage Low

0.4

V

Output Voltage High

0.5

V

POWER REQUIREMENTS

MAX1233

2.7

3

3.6

Supply Voltage (Note 12)

MAX1234

4.75

5

5.25

V

Idle; all blocks shut down

0.5

5

150

500

Only DAC on; no load

150

230

Analog and Digital Supply

Current

Only internal reference on

670

900

µA

TIMING CHARACTERISTICS

SCLK Clock Period

100

ns

SCLK Pulse Width High

40

ns

SCLK Pulse Width Low

40

ns

DIN to SCLK Rise Setup

40

ns

SCLK Rise to DIN Hold

0ns

SCLK Fall to DOUT Valid

40

ns

CS Fall to DOUT Enabled

45

ns

CS Rise to DOUT Disabled

40

ns

CS Fall to SCLK Rise

40

ns

CS Fall to SCLK Ignored

0ns

SCLK Rise to R_/C_ Data Valid

230

ns

CS Pulse Width High

40

ns

Note 1:

Note 2:

Relative accuracy is the deviation of the analog value at any code from its theoretical value after the offset and gain errors

have been removed.

Note 3:

Offset nulled.

Note 4:

× 2680°K/V. No calibration is necessary.

Note 5:

Temperature coefficient is -2.1mV/°C. Determine absolute temperature by extrapolating from a calibrated value.

Note 6:

compromise the ADC performance.

Note 7:

Guaranteed from code 5 to 255.