Rainbow Electronics MAX1499 - Manual (Page 5)

MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DV DD = 5V 320
DV DD = 3.3V 180 DV DD Current (Notes 8, 9) I DVDD
Standby mode 20
µA
LED Drivers Bias Current From AV DD or V DD 120 µA
LED DRIVERS (Table 6)
LED Supply Voltage V LED 2.70 5.25 V
LED Shutdown Supply Current I SHDN LED driver shutdown mode 10 µA
LED Supply Current I LED
Seven segments and decimal point on,
R
ISET = 25kΩ
176 mA
MAX1499 512
Display Scan Rate f OSC
MAX1497 640
Hz
Segment Current Slew Rate ∆I SEG /∆t 25 mA/µs
DIG_ Voltage Low V DIG I DIG_ = 176mA 0.178 0.300 V
Segment Drive Source Current
Matching
∆I SEG ±3 ±10 %
Segment Drive Source Current I
SEG
V
LED
- V
SEG
= 0.6V, R
ISET
= 25kΩ 16 20 25.5 mA
Interdigit Blanking Time 4 µs
ELECTRICAL CHARACTERISTICS (continued)
(AV DD = DV DD = V DD = +2.7V to +5.25V, GND = 0, GLED = 0, V LED = +2.7V to +5.25V, V REF+ - V REF- = 2.048V (external reference)
C REF+ = C REF- = 0.1µF, C VNEG = 0.1µF. Internal clock mode, unless otherwise noted. All specifications are at T A = T MIN to T MAX .
Typical values are at T
A
= +25°C, unless otherwise noted.)