User guide

MAX186/MAX188
Low-Power, 8-Channel,
Serial 12-Bit ADCs
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 5V ±5%; V
SS
= 0V or -5V; f
CLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX186—
4.7µF capacitor at VREF pin; MAX188—external reference, VREF = 4.096V applied to VREF pin; T
A
= T
MIN
to T
MAX
, unless otherwise
noted.)
PARAMETER
SYMBOL CONDITIONS MIN TYP MAX
Internal compensation mode 0
µFCapacitive Bypass at VREF
External compensation mode 4.7
MAX186 1.678
V/V
MAX188 1.638
MAX186 ±50
µAREFADJ Input Current
MAX188 ±5
V
INH
2.4 V
V
INL
0.8 V
DIN, SCLK, CS Input Hysteresis
V
HYST
0.15 V
DIN, SCLK, CS Input Leakage
I
IN
V
IN
= 0V or V
DD
±1 µA
C
IN
(Note 6) 15 pF
SHDN Input High Voltage
V
INH
V
DD
- 0.5 V
SHDN Input Low Voltage
V
INL
0.5 V
SHDN Input Current, High
I
INH
SHDN = V
DD
4.0 µA
SHDN Input Current, Low
I
INL
SHDN = 0V
-4.0 µA
SHDN Input Mid Voltage
V
IM
V
SHDN Voltage, Floating
V
FLT
SHDN = open
2.75 V
SHDN = open
-100 100 nA
I
SINK
= 5mA 0.4
Output Voltage Low V
OL
I
SINK
= 16mA 0.3
V
Output Voltage High V
OH
I
SOURCE
= 1mA 4 V
Three-State Leakage Current I
L
CS = 5V
±10 µA
Three-State Output Capacitance C
OUT
CS = 5V (Note 6)
15 pF
Positive Supply Voltage V
DD
5 ±5% V
DIN, SCLK, CS Input Capacitance
SHDN Max Allowed Leakage,
Mid Input
Negative Supply Voltage V
SS
0 or
-5 ±5%
V
Operating mode 1.5 2.5
Fast power-down 30 70
Positive Supply Current I
DD
Full power-down 210
Operating mode and fast power-down 50
Negative Supply Current I
SS
Full power-down 10
µA
mA
µA
DIN, SCLK, CS Input Low Voltage
DIN, SCLK, CS Input High Voltage
1.5 V
DD
-1.5
DIGITAL INPUTS (DIN, SCLK, , )
DIGITAL OUTPUTS (DOUT, SSTRB)
POWER REQUIREMENTS
UNITS
EXTERNAL REFERENCE AT REFADJ
Reference-Buffer Gain