Electrical characteristics (continued) – Rainbow Electronics MAX1231 User Manual
Page 3
MAX1227/MAX1229/MAX1231
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V, f
SAMPLE
= 300kHz, f
SCLK
= 4.8MHz (50% duty cycle), V
REF
= 2.5V, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CONVERSION RATE
External reference
0.8
Power-Up Time
t
PU
Internal reference (Note 3)
65
µs
Acquisition Time
t
ACQ
0.6
µs
Internally clocked
3.5
Conversion Time
t
CONV
Externally clocked (Note 4)
2.7
µs
Externally clocked conversion
0.1
4.8
External Clock Frequency
f
SCLK
Data I/O
10
MHz
SCLK Duty Cycle
40
60
%
Aperture Delay
30
ns
Aperture Jitter
<50
ps
ANALOG INPUT
Unipolar
0
V
REF
Input Voltage Range
Bipolar (Note 5)
- V
RE F
/ 2
V
RE F
/ 2
V
Input Leakage Current
V
IN
= V
DD
±0.01
±1
µA
Input Capacitance
During acquisition time (Note 6)
24
pF
INTERNAL TEMPERATURE SENSOR
Grade A, T
A
= +25
°C
±0.3
Grade A, T
A
= -20°C to +85°C
±0.5
±1
Grade A, T
A
= T
MIN
to T
MAX
±0.75
±1.5
Grade B, T
A
= +25
°C
±0.7
Measurement Error (Note 7)
Grade B, T
A
= T
MIN
to T
MAX
±1.2
±2.5
°C
Tem p er atur e M easur em ent N oi se
0.4
°C
RMS
Temperature Resolution
1/8
°C
Power-Supply Rejection
0.3
°C/V
INTERNAL REFERENCE
REF Output Voltage
2.48
2.50
2.52
V
Grade A
±8
REF Temperature Coefficient
TC
REF
Grade B
±30
p p m /° C
Output Resistance
6.5
k
Ω
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, f
SAMPLE
= 300ksps
40
100
REF+ Input Current
I
REF+
V
REF+
= 2.5V, f
SAMPLE
= 0
±0.1
±5
µA