MAX1245_09 Datasheet, PDF (4/21 Pages) Maxim Integrated Products – +2.375V, Low-Power, 8-Channel, Serial 12-Bit ADC

+2.375V, Low-Power, 8-Channel,
Serial 12-Bit ADC
TIMING CHARACTERISTICS
(V_DD = +2.375V to +3.3V, COM = 0V, T_A = T_MIN to T_MAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Acquisition Time
DIN to SCLK Setup
t_ACQ
t_DS
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
t_DH
t_DO
t_DV
t_TR
t_CSS
t_CSH
Figure 1
Figure 1
Figure 2
SCLK Pulse Width High
t_CH
SCLK Pulse Width Low
t_CL
SCLK Fall to SSTRB
CS Fall to SSTRB Output Enable
CS Rise to SSTRB Output Disable
SSTRB Rise to SCLK Rise
t_SSTRB
t_SDV
t_STR
t_SCK
Figure 1
External clock mode only, Figure 1
External clock mode only, Figure 2
Internal clock mode only (Note 7)
MIN TYP MAX UNITS
2.0
µs
200
ns
0
ns
20
260
ns
240
ns
400
ns
200
ns
0
ns
300
ns
300
ns
260
ns
240
ns
400
ns
0
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Tested at V_DD = +2.375V; COM = 0V; unipolar single-ended input mode.
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_DD.
Guaranteed by design. Not subject to production testing.
ADC performance is limited by the converter’s noise floor, typically 300µVp-p.
| | ^{Measured as V}FS^{(2.375V) - V}FS^{(3.3V) .}
__________________________________________Typical Operating Characteristics
(V_DD = 2.5V, VREF = 2.048V, f_CLK = 1.5MHz, C_LOAD = 20pF, T_A = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
1.25
R_L = ∞
CODE = 101010100000
1.00
C_LOAD = 50pF
0.75
C_LOAD = 20pF
0.50
2.375
2.625
2.875
V_DD (V)
3.125
3.375
SUPPLY CURRENT
vs. TEMPERATURE
0.90
R_L = ∞
CODE = 101010100000
0.85
0.80
0.75
0.70
0.65
-55 -30 -5 20 45 70 95 120 145
TEMPERATURE (°C)
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
2.375
2.625
2.875
V_DD (V)
3.125
3.375
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