Rainbow Electronics MAX1273 - Manual (Page 4)

MAX1272/MAX1273
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V DD = 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, V REF = 4.096V, C REF = 1.0µF, f SCLK = 1.4MHz,
50% duty cycle, C LOAD = 50pF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS
Converting 400 850
Standby power-down
mode
5 10 Input Current V REF = 4.096V
Full power-down mode 1
µA
POWER REQUIREMENTS
Supply Voltage V DD 4.75 5 5.25 V
Bipolar 2.4 4
Converting
Unipolar 2.2 3
mA
Standby power-down mode 400 700
Supply Current
(Internal Reference Mode)
I DD
Full power-down mode 1
µA
Bipolar 1.5 2.5
Converting
Unipolar 1.2 2.0
mA
Standby power-down mode 200 450
Supply Current
(External Reference Mode)
I DD
Full power-down mode 1
µA
External reference = 4.096V ±0.3 ± 1.0 Power-Supply Rejection
Ratio (Note 3)
PSRR
Internal reference ± 0.5
LSB
TIMING
Clock Frequency Range f
SCLK
0.1 1.4 MHz
T/H Acquisition Time t ACQ (Note 4) 2.85 µs
Conversion Time t CONV (Note 4) 8.57 µs
Throughput Rate 87.5 ksps
Internal Reference Settling Time REF bypass capacitor initially discharged 2 ms
Device Power-Up Time External reference mode 10 µs
DIGITAL INPUTS (DIN, SCLK, and CS)
Input High-Threshold Voltage V IH 2.4 V
Input Low-Threshold Voltage V IL 0.8 V
Input Hysteresis V HYS 0.2 V
Input Leakage Current I IN V IN = 0 to V DD -10 +10 µA
Input Capacitance C IN 15 pF
DIGITAL OUTPUT (DOUT)
I SINK = 10mA 0.4
Output Voltage Low V OL
I SINK = 16mA 0.6
V
Output Voltage High V OH I SOURCE = 0.5mA
V
DD
- 0.5
V
Three-State Leakage Current I L
CS = V
DD -10 +10 µA
Three-State Output Capacitance C OUT
CS = V
DD 15 pF