Datasheet

MAX1284/MAX1285
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
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ELECTRICAL CHARACTERISTICS—MAX1284 (continued)
(V
DD
= +4.5V to +5.5V; f
SCLK
= 6.4MHz, 50% duty cycle, 16 clocks/conversion cycle (400ksps), 4.7µF capacitor at REF, T
A
= T
MIN
to
T
MAX,
unless otherwise noted. Typical values are at T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS—MAX1285
(V
DD
= +2.7V to +3.6V; f
SCLK
= 4.8MHz, 50% duty cycle, 16 clocks/conversion cycle (300ksps), 4.7µF capacitor at REF, 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
INTERNAL REFERENCE
REF Output Voltage V
REF
2.48 2.50 2.52
V
REF Short-Circuit Current T
A
= +25°C 30 mA
REF Output Tempco
TC V
REF
±15
ppm/°C
Load Regulation (Note 5) 0 to 1mA output load 0.1 2.0
mV/mA
Capacitive Bypass at REF 4.7 10 µF
DIGITAL INPUTS (SCLK, CS, SHDN)
Input High Voltage V
INH
3.0 V
Input Low Voltage V
INL
0.8 V
Input Hysteresis
V
HYST
0.2 V
Input Leakage I
IN
V
IN
= 0V or V
DD
±1 µA
Input Capacitance C
IN
15 pF
DIGITAL OUTPUT (DOUT)
Output Voltage Low V
OL
I
SINK
= 5mA 0.4 V
Output Voltage High V
OH
I
SOURCE
= 1mA 4 V
Three-State Leakage Current I
L
V
CS
= +5V
±10
µA
Three-State Output Capacitance
C
OUT
V
CS
= +5V 15 pF
POWER SUPPLY
Positive Supply Voltage (Note 6)
VDD 4.5 5.5 V
Positive Supply Current (Note 7)
IDD V
DD
= +5.5V 2.5 4.0 mA
Shutdown Supply Current I
SHDN
SCLK = V
DD
, SHDN = GND 2 10 µA
Power-Supply Rejection PSR V
DD
= +5V ±10%, midscale input
±0.5 ±2.0
mV
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
DC ACCURACY (Note 1)
Resolution 12
Bits
Relative Accuracy (Note 2) INL
±1.0
LSB
Differential Nonlinearity DNL No missing codes over temperature
±1.0
LSB
Offset Error
±6.0
LSB
Gain Error (Note 3)
±6.0
LSB
Gain-Error Temperature
Coefficient
±1.6
ppm/°C