Datasheet

MAX11634–MAX11637
12-Bit, 300ksps ADCs with Differential
Track/Hold, and Internal Reference
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ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX11635/MAX11637), V
DD
= 4.75V to 5.25V (MAX11634/MAX11636), f
SAMPLE
= 300kHz, f
SCLK
= 4.8MHz
(external clock, 50% duty cycle), V
REF
= 2.5V (MAX11635/MAX11637), V
REF
= 4.096V (MAX11634/MAX11636) T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CONVERSION RATE
External reference 0.8
Power-Up Time t
PU
Internal reference (Note 5) 65
µs
Acquisition Time t
ACQ
0.6 µs
Internally clocked 3.5
Conversion Time t
CONV
Externally clocked (Note 6) 2.7
µs
Externally clocked conversion 0.1 4.8
External Clock Frequency f
SCLK
Data I/O 10
MHz
Aperture Delay 30 ns
Aperture Jitter < 50 ps
ANALOG INPUT
Unipolar 0 V
REF
Input Voltage Range
Bipolar (Note 7) -V
REF
/2 +V
REF
/2
V
Input Leakage Current V
IN
= V
DD
±0.01 ±1 µA
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 TC
REF
MAX11635/MAX11637 ±30
ppm/°C
Output Resistance 6.5 k
REF Output Noise 200 µV
RMS
REF Power-Supply Rejection PSRR -70 dB
EXTERNAL REFERENCE INPUT
REF- Input Voltage Range V
REF-
0 500 mV
REF+ Input Voltage Range V
REF+
1.0 V
DD
+ 50mV V
V
REF+
= 2.5V (MAX11635/MAX11637),
V
REF+
= 4.096V (MAX11634/MAX11636),
f
SAMPLE
= 300ksps
40 100
REF+ Input Current I
REF+
V
REF+
= 2.5V (MAX11635/MAX11637),
V
REF+
= 4.096V (MAX11634/MAX11636),
f
SAMPLE
= 0
±0.1 ±5
µA
DIGITAL INPUTS (SCLK, DIN, CS, CNV ST (Note 9)
MAX11634/MAX11636 0.8
Input Voltage Low V
IL
MAX11635/MAX11637 V
DD
x 0.3
V
MAX11634/MAX11636 2.0
Input Voltage High V
IH
MAX11635/MAX11637 V
DD
x 0.7
V
Input Hysteresis V
HYST
200 mV