Datasheet

External Clock Frequency Range
Low-Power, 8-Channel,
Serial 12-Bit ADCs
Maxim Integrated 3
MAX186/MAX188
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Small-Signal Bandwidth -3dB rolloff 4.5 MHz
Full-Power Bandwidth 800 kHz
Internal clock 5.5 10
Conversion Time (Note 5) t
CONV
External clock, 2MHz, 12 clocks/conversion 6
µs
Track/Hold Acquisition Time t
AZ
1.5 µs
Aperture Delay 10 ns
Aperture Jitter <50 ps
Internal Clock Frequency 1.7 MHz
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.)
External compensation, 4.7µF
0.1 2.0
Internal compensation (Note 6) 0.1 0.4
Used for data transfer only 10
MHz
Unipolar, V
SS
= 0V
Input Voltage Range,
Single-Ended and Differential
(Note 9)
Bipolar, V
SS
= -5V
V
Multiplexer Leakage Current
On/off leakage current, V
IN
= ±5V
±0.01 ±1 µA
Input Capacitance (Note 6) 16 pF
VREF Output Voltage
T
A
= +25°C
4.076 4.096 4.116 V
VREF Short-Circuit Current 30 mA
MAX186A, MAX186B,
MAX186C
±30 ±50
±30 ±60
VREF Tempco
MAX186D ±30
Load Regulation (Note 7) 0 to 0.5mA output load 2.5
Internal compensation 0
Capacitive Bypass at VREF
External compensation 4.7
µF
Internal compensation 0.01
Capacitive Bypass at REFADJ
External compensation 0.01
µF
MAX186_C
MAX186_E
REFADJ Adjustment Range ±1.5 %
±VREF/2
0 to
VREF
Input Voltage Range V
Input Current 200 350 µA
Input Resistance 12 20 kΩ
Shutdown VREF Input Current 1.5 10 µA
Buffer Disable Threshold REFADJ
V
DD
-
50mV
V
V
DD
+
2.50
50mV
CONVERSION RATE
ANALOG INPUT
INTERNAL REFERENCE (MAX186 only, reference buffer enabled)
EXTERNAL REFERENCE AT VREF (Buffer disabled, VREF = 4.096V)
ppm/°C
mV