MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 2.7V to 3.6V (MAX11645), VDD = 4.5V to 5.5V (MAX11644), VREF = 2.048V (MAX11645), VREF = 4.096V (MAX11644),
fSCL = 1.7MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, see Tables 1–5 for programming
notation.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT (AIN0/AIN1)
Unipolar
0
VREF
Input Voltage Range, Single-
Ended and Differential (Note 7)
Bipolar
0
±VREF/2
V
Input Multiplexer Leakage
On/off leakage current, VAIN_ = 0 or VDD
±0.01
±1
μA
Input Capacitance
CIN
22
pF
INTERNAL REFERENCE (Note 8)
MAX11645
1.968
2.048
2.128
Reference Voltage
VREF
TA = +25°C
MAX11644
3.936
4.096
4.256
V
Reference-Voltage Temperature
Coefficient
TCVREF
25
ppm/
°C
REF Short-Circuit Current
2
mA
REF Source Impedance
1.5
k
EXTERNAL REFERENCE
REF Input Voltage Range
VREF
(Note 9)
1
VDD
V
REF Input Current
IREF
fSAMPLE = 94.4ksps
40
μA
DIGITAL INPUTS/OUTPUTS (SCL, SDA)
Input-High Voltage
VIH
0.7 x VDD
V
Input-Low Voltage
VIL
0.3 x VDD
V
Input Hysteresis
VHYST
0.1 x VDD
V
Input Current
IIN
VIN = 0 to VDD
±10
μA
Input Capacitance
CIN
15
pF
Output Low Voltage
VOL
ISINK = 3mA
0.4
V
POWER REQUIREMENTS
MAX11645
2.7
3.6
Supply Voltage
VDD
MAX11644
4.5
5.5
V
Internal reference
900
1150
fSAMPLE = 94.4ksps
external clock
External reference
670
900
Internal reference
530
fSAMPLE = 40ksps
internal clock
External reference
230
Internal reference
380
fSAMPLE = 10ksps
internal clock
External reference
60
Internal reference
330
fSAMPLE =1ksps
internal clock
External reference
6
Supply Current
IDD
Shutdown (internal REF off)
0.5
10
μA
Power-Supply Rejection Ratio
PSRR
Full-scale input (Note 10)
±0.5
±2.0
LSB/V