Datasheet

MAX1227/MAX1229/MAX1231
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
_______________________________________________________________________________________ 5
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Externally clocked conversion 208
SCLK Clock Period t
CP
Data I/O 100
ns
SCLK Duty Cycle t
CH
40 60 %
SCLK Fall to DOUT Transition t
DOT
C
LOAD
= 30pF 40 ns
CS Rise to DOUT Disable t
DOD
C
LOAD
= 30pF 40 ns
CS Fall to DOUT Enable t
DOE
C
LOAD
= 30pF 40 ns
DIN to SCLK Rise Setup t
DS
40 ns
SCLK Rise to DIN Hold t
DH
0ns
C S Ri se- to- S C LK Ri se S etup Ti m et
CSS1
40 ns
CS Fall-to-SCLK Hold Time T
CSH0
0ns
CKSEL = 00, CKSEL = 01 (temp sense) 40 ns
CNVST Pulse Width t
CSW
CKSEL = 01 (voltage conversion) 1.4 µs
t
T S
Temp sense 55
Voltage conversion 7
CS or CNVST Rise to EOC
Low (Note 10)
Reference power-up 65
µs
TIMING CHARACTERISTICS (Figure 1)
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
0 1024 2048 3072 4096
INTEGRAL NONLINEARITY
vs. OUTPUT CODE
MAX1227/29/31 toc01
OUTPUT CODE
INTEGRAL NONLINEARITY (LSB)
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
0 1024 2048 3072 4096
DIFFERENTIAL NONLINEARITY
vs. OUTPUT CODE
MAX1227/29/31 toc02
OUTPUT CODE
DIFFERENTIAL NONLINEARITY (LSB)
SINAD vs. FREQUENCY
MAX1227/29/31 toc03
FREQUENCY (kHz)
AMPLITUDE (dB)
100101
10
20
40
30
60
50
90
80
70
100
0
0.1 1000
Typical Operating Characteristics
(V
DD
= +3V, V
REF
= +2.5V, f
SCLK
= 4.8MHz, C
LOAD
= 30pF, T
A
= +25°C, unless otherwise noted.)
Note 10: This time is defined as the number of clock cycles needed for conversion multiplied by the clock period. If the internal ref
erence needs to be powered up, the total time is additive. The internal reference is always used for temperature measure
ments.