
MAX11634–MAX11637
12-Bit, 300ksps ADCs with Differential
Track/Hold, and Internal Reference
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3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 2.7V to 3.6V (MAX11635/MAX11637), VDD = 4.75V to 5.25V (MAX11634/MAX11636), fSAMPLE = 300kHz, fSCLK = 4.8MHz
(external clock, 50% duty cycle), VREF = 2.5V (MAX11635/MAX11637), VREF = 4.096V (MAX11634/MAX11636) TA = TMIN to TMAX,
unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CONVERSION RATE
External reference
0.8
Power-Up Time
tPU
Internal reference (Note 5)
65
s
Acquisition Time
tACQ
0.6
s
Internally clocked
3.5
Conversion Time
tCONV
Externally clocked (Note 6)
2.7
s
Externally clocked conversion
0.1
4.8
External Clock Frequency
fSCLK
Data I/O
10
MHz
Aperture Delay
30
ns
Aperture Jitter
< 50
ps
ANALOG INPUT
Unipolar
0
VREF
Input Voltage Range
Bipolar (Note 7)
-VREF/2
+VREF/2
V
Input Leakage Current
VIN = VDD
±0.01
±1
A
Input Capacitance
During acquisition time (Note 8)
24
pF
INTERNAL REFERENCE
MAX11634/MAX11636
4.024
4.096
4.168
REF Output Voltage
MAX11635/MAX11637
2.48
2.50
2.52
V
MAX11634/MAX11636
±20
REF Temperature Coefficient
TCREF
MAX11635/MAX11637
±30
ppm/°C
Output Resistance
6.5
k
REF Output Noise
200
VRMS
REF Power-Supply Rejection
PSRR
-70
dB
EXTERNAL REFERENCE INPUT
REF- Input Voltage Range
VREF-
0
500
mV
REF+ Input Voltage Range
VREF+
1.0
VDD+ 50mV
V
VREF+ = 2.5V (MAX11635/MAX11637),
VREF+ = 4.096V (MAX11634/MAX11636),
fSAMPLE = 300ksps
40
100
REF+ Input Current
IREF+
VREF+ = 2.5V (MAX11635/MAX11637),
VREF+ = 4.096V (MAX11634/MAX11636),
fSAMPLE = 0
±0.1
±5
A
DIGITAL INPUTS (SCLK, DIN,
CS, CNVST (Note 9)
MAX11634/MAX11636
0.8
Input Voltage Low
VIL
MAX11635/MAX11637
VDD x 0.3
V
MAX11634/MAX11636
2.0
Input Voltage High
VIH
MAX11635/MAX11637
VDD x 0.7
V
Input Hysteresis
VHYST
200
mV