Datasheet

MAX11638/MAX11639/MAX11642/MAX11643
8-Bit, 16-/8-Channel, 300ksps ADCs
with FIFO and Internal Reference
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX11639/MAX11643), V
DD
= +4.75V to +5.25V (MAX11638/MAX11642), f
SAMPLE
= 300kHz, f
SCLK
=
4.8MHz (external clock 50% duty cycle), V
REF
= 2.5V (MAX11639/MAX11643), V
REF
= 4.096V (MAX11638/MAX11642), 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
Input Voltage Range Unipolar 0 V
REF
V
Input Leakage Current V
IN
= V
DD
±0.01 ±1 µA
Input Capacitance During acquisition time (Note 7) 24 pF
INTERNAL REFERENCE
MAX11638/MAX11642 4.024 4.096 4.168
REF Output Voltage
MAX11639/MAX11643 2.48 2.50 2.52
V
MAX11638/MAX11642 ±20
REF Temperature Coefficient V
REF
MAX11639/MAX11643 ±30
ppm/°C
Output Resistance 6.5 k
REF Output Noise 200 µV
RMS
REF Power-Supply Rejection PSRR -70 dB
EXTERNAL REFERENCE
REF Input Voltage Range V
REF
1.0 V
DD
+ 50mV V
V
REF
= 2.5V (MAX11639/MAX11643),
V
REF
= 4.096V (MAX11638/MAX11642),
f
SAMPLE
= 300ksps
40 100
REF Input Current I
REF
V
REF
= 2.5V (MAX11639/MAX11643),
V
REF
= 4.096V (MAX11638/MAX11642),
f
SAMPLE
= 0
±0.1 ±5
µA