Datasheet

MAX1236–MAX1239
2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1237/MAX1239), V
DD
= 4.5V to 5.5V (MAX1236/MAX1238), V
REF
= 2.048V (MAX1237/MAX1239), V
REF
=
4.096V (MAX1236/MAX1238), f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, see
Tables 1–5 for programming notation.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Internal clock, SCAN[1:0] = 01 51
Internal clock, SCAN[1:0] = 00
CS[3:0] = 1011 (MAX1238/MAX1239)
51
Throughput Rate f
SAMPLE
External clock 94.4
ksps
Track/Hold Acquisition Time 800 ns
Internal Clock Frequency 2.8 MHz
External clock, fast mode 60
Aperture Delay (Note 5) t
AD
External clock, high-speed mode 30
ns
ANALOG INPUT (AIN0–AIN11)
Unipolar 0 V
REF
Input-Voltage Range, Single-
Ended and Differential (Note 6)
Bipolar 0 ±V
REF
/2
V
Input Multiplexer Leakage Current ON/OFF leakage current, V
AIN
_ = 0V or V
DD
±0.01 ±1µA
Input Capacitance C
IN
22 pF
INTERNAL REFERENCE (Note 7)
MAX1237/MAX1239 1.968 2.048 2.128
Reference Voltage V
REF
T
A
= +25°C
MAX1236/MAX1238 3.936 4.096 4.256
V
Reference-Voltage Temperature
Coefficient
TCV
REF
25 ppm/°C
REF Short-Circuit Current 2mA
REF Source Impedance 1.5 kΩ
EXTERNAL REFERENCE
REF Input-Voltage Range V
REF
(Note 8) 1 V
DD
V
REF Input Current I
REF
f
SAMPLE
= 94.4ksps 40 µA
DIGITAL INPUTS/OUTPUTS (SCL, SDA)
Input-High Voltage V
IH
0.7
✕
V
DD
V
Input-Low Voltage V
IL
0.3
✕
V
DD
V
Input Hysteresis V
HYST
0.1
✕
V
DD
V
Input Current I
IN
V
IN
= 0V to V
DD
±10 µA
Input Capacitance C
IN
15 pF
Output Low Voltage V
OL
I
SINK
= 3mA 0.4 V