Rainbow-electronics MAX1499 Manual de usuario descargar pdf (Pagina 5)

MAX1497/MAX1499

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

Drivers and µC Interface

_______________________________________________________________________________________ 5

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

= 5V 320

= 3.3V 180DV

Current (Notes 8, 9) I

DVDD

Standby mode 20

µA

LED Drivers Bias Current From AV

or V

120

µA

LED DRIVERS (Table 6)

LED Supply Voltage V

LED

2.70 5.25

LED Shutdown Supply Current I

SHDN

LED driver shutdown mode 10 µA

LED Supply Current I

LED

Seven segments and decimal point on,

ISET

= 25kΩ

176

MAX1499

512

Display Scan Rate f

OSC

MAX1497

640

Segment Current Slew Rate

∆I

SEG

/∆t

mA/µs

DIG_ Voltage Low V

DIG

DIG_

= 176mA

0.178 0.300

Segment Drive Source Current

Matching

∆I

SEG

±3 ±10 %

Segment Drive Source Current I

SEG

LED

- V

SEG

= 0.6V, R

ISET

= 25kΩ 16 20

25.5

Interdigit Blanking Time 4µs

ELECTRICAL CHARACTERISTICS (continued)

(AV

= DV

= V

= +2.7V to +5.25V, GND = 0, GLED = 0, V

LED

= +2.7V to +5.25V, V

REF+

- V

REF-

= 2.048V (external reference)

REF+

= C

REF-

= 0.1µF, C

VNEG

= 0.1µF. Internal clock mode, unless otherwise noted. All specifications are at T

= T

MIN

to T

MAX

Typical values are at T

= +25°C, unless otherwise noted.)

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Rainbow-electronics MAX1499 Manual de usuario Pagina 5

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