MAX1280/MAX1281
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
_______________________________________________________________________________________ 7
TIMING CHARACTERISTICS—MAX1281
(Figures 1, 2, 6, 7; V
DD1
= V
DD2
= +2.7V to +3.6V; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
CONDITIONS
ns
100
t
CSW
CS Pulse Width High
ns
85
t
STE
CS Fall to SSTRB Enable
ns
85
t
DOE
CS Fall to DOUT Enable
ns
13 85
t
STD
CS Rise to SSTRB Disable
ns
13 85
t
DOD
CS Rise to DOUT Disable
ns
100
t
STV
SCLK Rise to SSTRB Valid
ns
100
t
DOV
SCLK Rise to DOUT Valid
ns
83
t
CL
SCLK Pulse Width Low
ns
83
t
CH
ns
208
t
CP
SCLK Period
SCLK Pulse Width High
ns
120
t
STH
SCLK Rise to SSTRB Hold
ns
13 20
t
DOH
SCLK Rise to DOUT Hold
ns
45
t
CS1
CS Rise to SCLK Rise Ignore
ns
45
t
CSO
SCLK Rise to CS Fall ignore
ns
45
t
DS
DIN to SCLK Setup
ns
0
t
DH
DIN to SCLK Hold
ns
45
t
CSS
CS Fall to SCLK Rise Setup
ns
0
t
CSH
SCLK Rise to CS Rise Hold
UNITSMIN TYP MAXSYMBOLPARAMETER
Note 1: MAX1280 tested at V
DD1
= V
DD2
= +5V, MAX1281 tested at V
DD1
= V
DD2
= +3V; COM = GND; unipolar single-ended
input mode.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and offset
error have been nulled.
Note 3: Offset nulled.
Note 4: Ground “on” channel; sine wave applied to all “off” channels.
Note 5: Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
Note 6: The absolute voltage range for the analog inputs (CH7–CH0, and COM) is from GND to V
DD1
.
Note 7: External load should not change during conversion for specified accuracy. Guaranteed specification of 2mV/mA is a result
of production test limitations.
Note 8: ADC performance is limited by the converter’s noise floor, typically 300µVp-p.
Note 9: Electrical characteristics are guaranteed from V
DD1(MIN)
= V
DD2(MIN)
to V
DD1(MAX)
= V
DD2(MAX)
. For operations beyond
this range, see the Typical Operating Characteristics. For guaranteed specifications beyond the limits, contact the factory.
Note 10: A
IN
= midscale. Unipolar mode
.
MAX1280 tested with 20pF on DOUT, 20pF on SSTRB, and f
SCLK
= 6.4MHz, 0 to 5V.
MAX1281 tested with same loads, f
SCLK
= 4.8MHz, 0 to 3V. DOUT = FFF hex.
Note 11:
