Datasheet

MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V (MAX1146/MAX1148), V
DD
= 3.3V (MAX1147/MAX1149), SHDN = V
DD
, V
COM
= 0, f
SCLK
= 2.1MHz, external clock (50%
duty cycle), 18 clocks/conversion (116ksps), V
REFADJ
= V
DD
, C
REF
= 2.2µF, external +4.096V reference at REF (MAX1146/
MAX1148), external 2.500V reference at REF (MAX1147/MAX1149), 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
EXTERNAL REFERENCE AT REF
REF Input Voltage Range V
REF
1.5
V
DD
+
50mV
V
125
450
REF Input Current I
REF
Shutdown
0.01
10
µA
REF Input Resistance 68 kΩ
DIGITAL INPUTS (DIN, SCLK, CS, SHDN)
V
DD
< 3.6V 2.0
Input High Voltage V
IH
V
DD
> 3.6V 3.0
V
Input Low Voltage V
IL
0.8 V
Input Hysteresis V
HYST
0.2 V
Input Leakage I
IN
±1 µA
Input Capacitance C
IN
10 pF
DIGITAL OUTPUT (DOUT, SSTRB)
Output-Voltage Low V
OL
I
SINK
= 2mA 0.4 V
Output-Voltage High V
OH
I
SOURCE
= 2mA
V
DD
- 0.5
V
Tri-State Leakage Current I
L
CS = V
DD
±10
µA
Tri-State Output Capacitance C
OUT
CS = V
DD
10 pF
POWER REQUIREMENTS
MAX1147/MAX1149 2.7 3.6
Positive Supply Voltage V
DD
MAX1146/MAX1148
4.75 5.25
V
116ksps 1.1 1.5
10ksps
0.12
External
reference
1ksps
0.012
mA
Supply Current (Note 8) I
DD
Normal
operation, full-
scale input
Internal reference at
116ksps
1.9 2.4 mA
Fast power-down
120
Full power-down 0.3
Shutdown Supply Current
(Note 8)
SHDN = DGND 0.3 10
µA
Power-Supply Rejection (Note 9)
PSR External reference
±0.2
mV