Datasheet
(V
DD
= +5V ±5%, V
L
= 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); MAX1202—4.7μF capacitor at REF pin; MAX1203—external reference, V
REF
= 4.096V applied to REF pin; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CONVERSION RATE
Conversion Time (Note 5) t
CONV
Internal clock 5.5 10
µs
External clock, 2MHz, 12 clocks/conversion 6
Track/Hold Acquisition Time t
ACQ
1.5 µs
Aperture Delay 10 ns
Aperture Jitter < 50 ps
Internal Clock Frequency 1.7 MHz
External Clock Frequency Range
External compensation mode, 4.7µF 0.1 2.0
MHzInternal compensation mode (Note 6) 0.1 0.4
Used for data transfer only 0 2.0
ANALOG INPUT
Input Voltage Range, Single-Ended
and Differential (Note 7)
Unipolar, V
SS
= 0V V
REF
V
Bipolar, V
SS
= -5V ±V
REF
/2
Multiplexer Leakage Current On/off-leakage current, V
CH_
= ±5V ±0.01 ±1 µA
Input Capacitance (Note 6) 16 pF
INTERNAL REFERENCE (MAX1202 only, reference-buffer enabled)
REF Output Voltage T
A
= +25°C
4.076 4.096 4.116 V
REF Short-Circuit Current
30 mA
V
REF
Temperature Coefcien
MAX1202AC ±30 ±50
ppm/°C
MAX1202AE ±30 ±60
MAX1202B ±30
Load Regulation (Note 8) 0 to 0.5mA output load
2.5 mV
Capacitive Bypass at REF
Internal compensation mode
0
µF
External compensation mode 4.7
Capacitive Bypass at REFADJ
0.01 µF
REFADJ Adjustment Range
±1.5 %
EXTERNAL REFERENCE AT REF (Reference buffer disabled, V
REF
= 4.096V)
Input Voltage Range
2.50
V
DD
+
50mV
V
Input Current
200 350 µA
Input Resistance
12 20 kΩ
REF Input Current in Shutdown
V
SHDN
= 0V 1.5 10 µA
REFADJ Buffer Disable Threshold
V
DD
-
50mV
V
MAX1202/MAX1203 5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
www.maximintegrated.com
Maxim Integrated
│
3
Electrical Characteristics (continued)