Rainbow-electronics MAX1494 Uživatelský manuál stáhnout pdf

General Description

The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit,

analog-to-digital converters (ADCs) with integrated liquid

crystal display (LCD) drivers operate from a single 2.7V

to 5.25V power supply. They include an internal refer-

ence, a high-accuracy on-chip oscillator, and a triplexed

LCD driver. An internal charge pump generates the neg-

ative supply needed to power the integrated input buffer

for single-supply operation. The ADC is configurable for

either a ±2V or ±200mV input range and outputs its con-

version results to an LCD and/or to a microcontroller

(µC). µC communication is facilitated through an

SPI™-/QSPI™-/MICROWIRE™-compatible serial inter-

face. The MAX1492 is a 3.5-digit (±1999 count) device,

and the MAX1494 is a 4.5-digit (±19,999 count) device.

The MAX1492/MAX1494 do not require external-preci-

sion integrating capacitors, autozero capacitors, crystal

oscillators, charge pumps, or other circuitry required

with dual-slope ADCs (commonly used in panel meter

circuits).

These devices also feature on-chip buffers for the dif-

ferential signal and reference inputs, allowing direct

interface with high-impedance signal sources. In addi-

tion, they use continuous internal-offset calibration and

offer >100dB simultaneous rejection of 50Hz and 60Hz

line noise. Other features include data hold and peak

hold, overrange and underrange detection, and a low-

battery monitor.

The MAX1494 comes in a 32-pin, 7mm x 7mm TQFP

package, and the MAX1492 comes in 28-pin SSOP and

28-pin PDIP packages. All devices in this family operate

over the 0°C to +70°C commercial temperature range.

Applications

Digital Panel Meters

Hand-Held Meters

Digital Voltmeters

Digital Multimeters

Features

♦ High Resolution

MAX1494: 4.5 Digits (±19,999 Count)

MAX1492: 3.5 Digits (±1999 Count)

♦ Sigma-Delta ADC Architecture

No Integrating Capacitors Required

No Autozeroing Capacitors Required

>100dB of Simultaneous 50Hz and 60Hz

Rejection

♦ Operate from a Single 2.7V or 5.25V Supply

♦ Selectable Input Range of ±200mV or ±2V

♦ Selectable Voltage Reference: Internal 2.048V

or External

♦ Internal High-Accuracy Oscillator Needs No

External Components

♦ Automatic Offset Calibration

♦ Low Power

Maximum 960µA Operating Current

Maximum 400µA Shutdown Current

♦ Small 32-Pin 7mm x 7mm TQFP Package

(4.5 Digits), 28-Pin SSOP Package (3.5 Digits)

♦ Triplexed LCD Driver

♦ SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface

♦ Evaluation Kit Available (Order MAX1494EVKIT)

MAX1492/MAX1494

3.5- and 4.5-Digit, Single-Chip ADCs

with LCD Drivers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2959; Rev 3; 5/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE

RESOLUTION

(DIGITS)

MAX1492CAI

0°C to +70°C

28 SSOP 3.5

MAX1492CNI

0°C to +70°C

28 PDIP 3.5

MAX1494CCJ

0°C to +70°C

32 TQFP 4.5

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations appear at end of data sheet.

1 2 3 4 5 6 ... 34 35

Shrnutí obsahu

Strany 1 - MAX1492/MAX1494

General DescriptionThe MAX1492/MAX1494 low-power, 3.5- and 4.5-digit,analog-to-digital converters (ADCs) with integrated liquidcrystal display (LCD) d

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MAX1492/MAX1494Detailed DescriptionThe MAX1492/MAX1494 low-power, highly integratedADCs with LCD drivers convert a ±2V differential inputvoltage (one

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ten times the first-notch frequency and 60Hz is equal to12 times the first-notch frequency.For large step changes at the input, allow a settlingtime o

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MAX1492/MAX1494and 5 show the assignment of the 4.5-digit display seg-ments, and Figures 6 and 7 show the assignment of the3.5-digit display segments.

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thus the contrast of the segment. The RMS OFF voltageis always VLCD / 3, whereas the RMS ON voltage isalways 1.92VLCD / 3. This is illustrated in Figu

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MAX1492/MAX1494The MAX1492/MAX1494 allow for full decimal-point con-trol and feature leading zero suppression. Use theDP_EN, DPSET1, and DPSET2 bits i

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Figure 21 shows the MAX1492/MAX1494 operating withan external single-ended reference. In this mode, REF-is connected to GND and REF+ is driven with an

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers16 ________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers26 ________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers30 ________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1494(MAX1492)0.1µF 4.7µF0.1µF0.1µF0.1µF0.1µF4.7µF10µFLISORHIRLOW2.7V TO5.25VAIN+AIN-DVDDAVDDLOWBATT VNEGGND REF- REF+VDISP(MAX1494 ONLY)CLKSCLKDIND

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers34 ________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD DriversMaxim cannot assume responsibility for use of any circuitry other than circuitry en

Strany 30 - Figure 22. 4–20mA Transmitter

MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers4 _________________________________________________________________________________

Strany 31 - ±1.8.8.8.8

MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers6 _________________________________________________________________________________

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MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

Strany 34 - Package Information

MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers8 _________________________________________________________________________________

Strany 35 - PDIPN.EPS

MAX1492/MAX14943.5- and 4.5-Digit, Single-Chip ADCswith LCD Drivers___________________________________________________________________________________

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