MAX1499ECJ+【PDF 7/33 页】IC ADC 3 1/2DIG W/LED DVR 32TQFP

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MAX1497/MAX1499

3.5- and 4.5-Digit, Single-Chip ADCs with LED

Drivers and C Interface

______________________________________________________________________________________

Leading-Zero Suppression

The MAX1497/MAX1499 include a leading-zero sup-

pression circuitry to turn off unnecessary zeros. For

example, when DPSET1 and DPSET2 = [0,0], 0.0 is dis-

played instead of 000.0. This feature saves a substan-

tial amount of power from being wasted.

Interdigit Blanking

The MAX1497/MAX1499 also include an interdigit

blanking circuitry. Without this feature, it is possible to

see a faint digit next to a digit that is completely on. The

interdigit blanking circuitry prevents bleeding over into

the next digit for a short period of time. The typical

interdigit blanking time is 4s.

Reference

The MAX1497/MAX1499 reference sets the full-scale

range of the ADC transfer function. With a nominal

2.048V reference, the ADC full-scale range is ±2V with

the RANGE bit equal to zero. With the RANGE bit set to

one, the full-scale range is ±200mV. A decreased refer-

ence voltage decreases full-scale range (see the

Transfer Functions section).

The MAX1497/MAX1499 accept either an external ref-

erence or an internal reference. The INTREF bit selects

the reference mode (see the Control Register

(Read/Write) section).

For internal reference operation, set the INTREF bit to

one, connect REF- to GND, and bypass REF+ to GND

with a 4.7F capacitor. The internal reference provides

a nominal 2.048V source between REF+ and GND. The

internal reference temperature coefficient is typically

40ppm/°C.

The default power-on state sets the MAX1497/

MAX1499 to use the external reference with the INTREF

bit cleared to zero. The external reference inputs, REF+

and REF-, are fully differential. For a valid external refer-

ence input, VREF+ must be greater than VREF-. Bypass

REF+ and REF- with a 0.1F or greater capacitor to

GND in external reference mode.

Figure 16 shows the MAX1497/MAX1499 operating with

an external single-ended reference. In this mode, REF-

is connected to GND and REF+ is driven with an exter-

nal 2.048V reference. Bypass REF+ to GND with a

0.47F capacitor.

43210432

TON

DIGIT 4 (MSD)

DIGIT 3

DIGIT 2

DIGIT 1

DIGIT 0 (LSD)

DATA

MSD

LSD

Figure 6. LED Voltage Waveform—MAX1499

32103210

TON

DIGIT 3 (MSD)

DIGIT 2

DIGIT 1

DIGIT 0 (LSD)

DATA

MSD

LSD

Figure 7. LED Voltage Waveform—MAX1497

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