
MAX1391/MAX1394
_______________________________________________________________________________________
3
1.5V to 3.6V, 416ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 8-Bit, SAR ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +1.5V to +3.6V, VREF = VDD, CREF = 0.1F, fSCLK = 5MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Throughput Rate
12 clocks per conversion, includes power-
up acquisiton and conversion time
416
ksps
Power-Up and Acquisition Time
tACQ
Three SCLK cycles
600
ns
Aperture Delay
tAD
8ns
Aperture Jitter
tAJ
30
ps
Serial-Clock Frequency
fCLK
0.1
5.0
MHz
ANALOG INPUTS (AIN+, AIN-, AIN1, AIN2)
Unipolar
0
VREF
Input Voltage Range
VIN
Bipolar, MAX1391 only, (AIN+ - AIN-)
-VREF/2
+VREF/2
V
Common-Mode Input Voltage
Range
VCM
Bipolar, MAX1391 only, [(AIN+) + (AIN-)] / 2
0
VDD
V
Input Leakage Current
Channel not selected, or conversion
stopped, or in shutdown mode
±1.5
A
Input Capacitance
16
pF
REFERENCE INPUT (REF)
REF Input Voltage Range
VREF
0.6
VDD +
0.05
V
REF Input Capacitance
24
pF
REF DC Leakage Current
0.025
±2.5
A
REF Input Dynamic Current
416ksps
20
60
A
DIGITAL INPUTS (SCLK,
CS, OE, CH1/CH2, UNI/BIP)
Input-Voltage Low
VIL
0.3 x
VDD
V
Input-Voltage High
VIH
0.7 x
VDD
V
Input Hysteresis
0.06 x
VDD
V
Input Leakage Current
IIL
Inputs at GND or VDD
±1
A
CS, OE
1
Input Capacitance
CIN
CH1/CH2, UNI/BIP
12.5
pF
DIGITAL OUTPUT (DOUT)
Output-Voltage Low
VOL
ISINK = 2mA
0.1 x
VDD
V
Output-Voltage High
VOH
ISOURCE = 2mA
0.9 x
VDD
V
Tri-State Leakage Current
ILT
OE = VDD
±1
A
Tri-State Output Capacitance
COUT
OE = VDD
10
pF
POWER SUPPLY
Positive Supply Voltage
VDD
1.5
3.6
V