MAX1492 datasheet(11/35 Pages) MAXIM

Part #	MAX1492

Description	3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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ten times the first-notch frequency and 60Hz is equal to

12 times the first-notch frequency.

For large step changes at the input, allow a settling

time of 800ms before valid data is read.

Clock Modes

Configure the MAX1492/MAX1494 to use either the

internal oscillator or an externally applied clock to drive

the modulator and filter. Set the EXTCLK bit in the con-

trol register to 0 to put the device in internal clock mode.

Set the EXTCLK bit high to put the device in external

clock mode. Connect CLK to GND or DVDD when using

the internal oscillator. The MAX1492/MAX1494 ideally

operate with a 4.9152MHz clock to achieve maximum

rejection of 50Hz/60Hz common-mode, power-supply,

and normal-mode noise.

Internal Clock Mode

The MAX1492/MAX1494 contain an internal oscillator.

The power-up condition for the MAX1492/MAX1494 is

internal clock operation with the EXTCLK bit in the con-

trol register equal to 0. Using the internal oscillator

saves board space by removing the need for an exter-

nal clock source.

External Clock Mode

For external clock operation, set the EXTCLK bit in the

control register high and drive CLK with a 4.9152MHz

clock source. Using an external clock allows for custom

conversion rates. A 2.4576MHz clock signal reduces

the conversion rate and the LCD update rate by a fac-

tor of two. The MAX1492/MAX1494 operate with an

external clock source of up to 5.05MHz.

Charge Pump

The MAX1492/MAX1494 contain an internal charge

pump to provide the negative supply voltage for the inter-

nal analog input/reference buffers. The bipolar input

range of the analog input/reference buffers allows this

device to accept negative inputs with high source imped-

ances. Connect a 0.1µF capacitor from VNEG to GND.

LCD Driver

The MAX1492/MAX1494 contain the necessary back-

plane and segment-driver outputs to drive 3.5-digit

(MAX1492) and 4.5-digit (MAX1494) LCDs. The LCD

update rate is 2.5Hz. Figures 4–7 show the connection

schemes for a standard LCD. The MAX1492/MAX1494

automatically display the results of the ADC, if desired.

The MAX1492/MAX1494 also allow independent control

of the LCD driver through the serial interface, allowing

for data processing of the ADC result before showing

the result on the LCD. Additionally, each LCD segment

can be individually controlled (see the LCD Segment-

Display Register sections).

Triplexing

An internal resistor string comprised of three equal-

value resistors (52k

Ω, 1% matching) is used to gener-

ate the display drive voltages. On the MAX1492, one

end of the string is connected to DVDD and the other

end is connected to GND. On the MAX1494, the other

end of the resistor string is connected to VDISP. Note

that VLCD should be three times the threshold voltage

for the liquid crystal material used (Figure 9).

The connection diagrams for a typical 7-segment dis-

play-font decimal point and annunciators are illustrated

in Figures 3 and 8. The MAX1494/MAX1492 numeric

display drivers (4.5 digits, 3.5 digits) use this configura-

tion to drive a triplexed LCD with three backplanes and

13 segment-driver lines (10 for 3.5 digits). Figures 4

3.5- and 4.5-Digit, Single-Chip ADCs

with LCD Drivers

______________________________________________________________________________________

11

a

XY

Z

g

d

e

f

c

b

DP

ANNUNCIATOR

a

g

d

e

f

c

b

DP

ANNUNCIATOR

BP1

BP2

BP3

Figure 3. Connection Diagrams for Typical 7-Segment Displays

MANUFACTURER

WEBSITE

PART NUMBER

DESCRIPTION

04-0924-00

3.5 digit, 5V

04-0924-01

3.5 digit, 3V

04-0925-00

4.5 digit, 5V

DCI, Inc.

www.dciincorporated.com

04-0925-01

4.5 digit, 3V

The following site has links to other custom LCD manufacturers: www.earthlcd.com/mfr.htm

Table 1. List of Custom LCD Manufacturers

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