MAX1234EVC16【PDF 42/44 页】EV SYSTEM/EV KIT MAX1233/MAX1234

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±15kV ESD-Protected Touch-Screen

Controllers Include DAC and Keypad Controller

connections. Establish a single-point analog ground

QSPI

CS

SCK

MISO

CS

SCLK

DOUT

MAX1233

(star ground point) at GND. Connect all analog grounds

to the star ground. Connect the digital system ground

to the star ground at this point only. For lowest noise oper-

ation, the ground return to the star ground’s power supply

should be low impedance and as short as possible.

V DD

MOSI

DIN

MAX1234

High-frequency noise in the power supply may affect

the high-speed comparator in the ADC. Bypass the

BUSY

PENIRQ

supply to the star ground with a 0.1μF capacitor as

close to pins 1 and 2 of the MAX1233/MAX1234 as

SS

Figure 29. QSPI Interface

SUPPLIES

KEYIRQ

possible. Minimize capacitor lead lengths for best sup-

ply-noise rejection. If the power supply is very noisy, a

10 Ω resistor can be connected as a lowpass filter.

While using the MAX1233/MAX1234 with a resistive

touch screen, the interconnection between the convert-

er and the touch screen should be as short and robust

as possible. Since resistive touch screens have a low

resistance, longer or loose connections are a source of

+3V/+5V

GND

+3V/+5V

error. Noise can also be a major source of error in

touch-screen applications (e.g., applications that

require a backlight LCD panel). This EMI noise can be

R* = 10 Ω

coupled through the LCD panel to the touch screen

and cause “flickering” of the converted data. Utilizing a

touch screen with a bottom-side metal layer connected

AV DD

GND

DV DD

V DD

DGND

to ground couples the majority of noise to ground. In

addition, the filter capacitors from Y+, Y-, X+, and X-

MAX1233

MAX1234

DIGITAL

CIRCUITRY

inputs to ground also help reduce the noise further.

Caution should be observed for settling time of the

touch screen.

*OPTIONAL

Figure 30. Power-Supply Grounding Connection

two 8-bit data streams write the command word into the

MAX1233/MAX1234. The next two 8-bit data streams

can contain either the input or output data.

QSPI Interface

Using the high-speed QSPI interface (Figure 29) with

CPOL = 0 and CPHA = 0, the MAX1233/MAX1234 sup-

port a maximum f SCLK of 10MHz. DOUT data transi-

tions on the serial clock’s falling edge and is clocked

into the μP on the SCLK’s rising edge.

Layout, Grounding, and Bypassing

For best performance, use printed circuit boards with

good layouts; do not use wire-wrap boards even for

prototyping. Ensure that digital and analog signal lines

are separated from each other. Do not run analog and

digital (especially clock) lines parallel to one another, or

digital lines underneath the ADC package.

Figure 30 shows the recommended system ground

Definitions

Integral Nonlinearity

Integral nonlinearity (INL) is the deviation of the values

on an actual transfer function from a straight line. This

straight line can be either a best-straight-line fit or a line

drawn between the end points of the transfer function,

once offset and gain errors have been nullified. The

static linearity parameters for the MAX1233/MAX1234

are measured using the end-point method.

Differential Nonlinearity

Differential nonlinearity (DNL) is the difference between

an actual step width and the ideal value of 1LSB. A

DNL error specification of less than 1LSB guarantees

no missing codes and a monotonic transfer function.

Aperture Jitter

Aperture jitter (t AJ ) is the sample-to-sample variation in

the time between the samples.

Aperture Delay

Aperture delay (t AD ) is the time defined between the

falling edge of the sampling clock and the instant when

an actual sample is taken.

42

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