Rainbow Electronics MAX1143 - Manual (Page 4)

MAX1142/MAX1143
14-Bit ADC, 200ksps, +5V Single-Supply
with Reference
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(AV DD = DV DD = +5V ±5%, f SCLK = 4.8MHz, external clock (50% duty cycle), 24 clocks/conversion (200ksps), bipolar input, external
V REF = +4.096V, V REFADJ = AV DD , C REF = 2.2µF, C CREF = 1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at
T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
REFADJ Buffer Disable
Threshold
To power-down the internal reference
AV DD -
0.5V
AV DD -
0.1V
V
Buffer Voltage Gain 1 V/V
EXTERNAL REFERENCE (Reference buffer disabled. Reference applied to REF)
Input Range (Notes 5 and 6) 3.0 4.096 4.2 V
V REF = 4.096V, f SCLK = 4.8MHz 250
V
REF
= 4.096V, f
SCLK
= 0 230 Input Current
In power-down, f SCLK = 0 0.1
µ
A
DIGITAL INPUTS
Input High Voltage V IH 2.4 V
Input Low Voltage V IL 0.8 V
Input Leakage I IN V IN = 0 or DV DD
±
1
µ
A
Input Hysteresis V HYST 0.2 V
Input Capacitance C IN 10 pF
DIGITAL OUTPUTS
Output High Voltage V OH I SOURCE = 0.5mA
DV DD -
0.5
V
I SINK = 5mA 0.4
Output Low Voltage V OL
I
SINK
= 16mA 0.8
V
Three-State Leakage Current I L
CS = DV
DD
± 10 µ A
Three-State Output
Capacitance
CS = DV
DD 10 pF
POWER SUPPLIES
Analog Supply (Note 7) AV DD 4.75 5 5.25 V
Digital Supply (Note 7) DV DD 4.75 5 5.25 V
Unipolar Mode 5 8
Bipolar Mode 8.5 11
mA
Analog Supply Current I ANALOG
SHDN = 0, or softw are power -down mode
0.3 10
µ
A
Unipolar or Bipolar Mode 2.5 3.5 mA
Digital Supply Current I DIGITAL
SHDN = 0, or softw are power -down mode 2.2 10
µ
A
Power Supply Rejection Ratio
(Note 8)
PSRR AV DD = DV DD = 4.75V to 5.25V, 72 dB