MAX1245 Maxim, MAX1245 Datasheet - Page 4

• Manufacturer Part Number: MAX1245
• Description: +2.375V / Low-Power / 8-Channel / Serial 12-Bit ADC
• Manufacturer: Maxim

TIMING CHARACTERISTICS
(V
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
+2.375V, Low-Power, 8-Channel,
Serial 12-Bit ADC
__________________________________________Typical Operating Characteristics
(V
4
Acquisition Time
DIN to SCLK Setup
DIN to SCLK Hold
SCLK Fall to Output Data Valid
CS Fall to Output Enable
CS Rise to Output Disable
CS to SCLK Rise Setup
CS to SCLK Rise Hold
SCLK Pulse Width High
SCLK Pulse Width Low
SCLK Fall to SSTRB
CS Fall to SSTRB Output Enable
CS Rise to SSTRB Output Disable
SSTRB Rise to SCLK Rise
DD
DD
1.25
0.50
1.00
0.75
_______________________________________________________________________________________
= +2.375V to +3.3V, COM = 0V, T
= 2.5V, VREF = 2.048V, f
2.375
C
R
CODE = 101010100000
Tested at V
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
External reference (VREF = +2.048V), offset nulled.
Ground “on” channel; sine wave applied to all “off” channels.
Conversion time defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle.
The common-mode range for the analog inputs is from AGND to V
Guaranteed by design. Not subject to production testing.
ADC performance is limited by the converter’s noise floor, typically 300µVp-p.
Measured as
LOAD
PARAMETER
L
=
= 50pF
2.625
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
C
LOAD
DD
V
= 20pF
2.875
DD
|
= +2.375V; COM = 0V; unipolar single-ended input mode.
V
(V)
FS
(2.375V) - V
CLK
3.125
= 1.5MHz, C
SYMBOL
t
SSTRB
A
3.375
t
t
t
t
t
t
ACQ
t
t
t
t
CSH
t
SCK
FS
t
CSS
t
SDV
STR
DH
DO
CH
DS
DV
CL
TR
= T
(3.3V)
MIN
LOAD
to T
|
Figure 1
Figure 1
Figure 2
Figure 1
External clock mode only, Figure 1
External clock mode only, Figure 2
Internal clock mode only (Note 7)
0.90
0.85
0.80
0.75
0.70
0.65
.
-55
MAX
= 20pF, T
R
CODE = 101010100000
L
, unless otherwise noted.)
-30
=
-5
SUPPLY CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
A
20
CONDITIONS
= +25°C, unless otherwise noted.)
45
70
DD
95
.
120
145
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
2.375
MIN
200
200
300
300
2.0
20
0
0
INTEGRAL NONLINEARITY
2.625
vs. SUPPLY VOLTAGE
TYP
V
2.875
DD
(V)
MAX
260
240
400
260
240
400
0
3.125
UNITS
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3.375