Datasheet

MAX187/MAX189
+5V, Low-Power, 12-Bit Serial ADCs
3Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%; V
GND
= 0V; unipolar input mode; 75ksps, f
CLK
= 4.0MHz, external clock (50% duty cycle); MAX187—internal refer-
ence: V
REF
= 4.096V, 4.7µF capacitor at REF pin, or MAX189—external reference: V
REF
= 4.096V applied to REF pin, 4.7µF capacitor
at REF pin; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Aperture Delay t
APR
10 ns
Aperture Jitter < 50 ps
ANALOG INPUT
Input Voltage Range 0 to V
REF
V
Input Capacitance (Note 4) 16 pF
INTERNAL REFERENCE (MAX187 Only, Reference Buffer Enabled)
REF Output Voltage V
REF
T
A
= +25NC
4.076 4.096 4.116
V
T
A
= T
MIN
to
T
MAX
MAX187_C 4.060 4.132
MAX187_E 4.050 4.140
REF Short-Circuit Current
Q30
mA
REF Tempco
MAX187AC/BC
Q30 Q50
ppm/NC
MAX187AE/BE
Q30 Q60
MAX187C
Q30
Load Regulation (Note 5) 0 to 6mA output load 1 mV
EXTERNAL REFERENCE AT REF (Buffer Disabled, V
REF
= 4.096V)
Input Voltage Range 2.50 V
DD
+ 50mV V
Input Current 200 350 µA
Input Resistance 12 20
kI
Shutdown REF Input Current 1.5 10 µA
DIGITAL INPUTS (SCLK, CS, SHDN)
SCLK, CS Input High Voltage
V
INH
2.4 V
SCKL, CS Input Low Voltage
V
INL
0.8 V
SCLK, CS Input Hysteresis
V
HYST
0.15 V
SCLK, CS Input Leakage
I
IN
V
IN
= 0V or V
DD
±1 µA
SCLK, CS Input Capacitance
C
IN
(Note 4) 15 pF
SHDN Input High Voltage
V
INSH
V
DD
- 50mV V
SHDN Input Low Voltage
V
INSL
0.5 V
SHDN Input Current
I
INS
V
SHDN
= V
DD
or 0V
±4.0 µA
SHDN Input Mid voltage
V
IM
1.5 V
DD
- 1.5 V
SHDN Voltage, Floating
V
FLT
SHDN = Open
2.75 V
SHDN Maximum Allowed
Leakage, Mid-Input
SHDN = Open
-100 100 nA