MAX1240 Datasheet, PDF (4/16 Pages) Maxim Integrated Products – +2.7V, Low-Power, 12-Bit Serial ADCs in 8-Pin SO

+2.7V, Low-Power,
12-Bit Serial ADCs in 8-Pin SO
ELECTRICAL CHARACTERISTICS (continued)
(V_DD = +2.7V to +3.6V (MAX1240); V_DD = +2.7V to +5.25V (MAX1241); 73ksps, f_SCLK = 2.1MHz (50% duty cycle); MAX1240—4.7µF
capacitor at REF pin, MAX1241—external reference; V_REF = 2.500V applied to REF pin; T_A = T_MIN to T_MAX; unless otherwise noted.)
PARAMETERS
POWER REQUIREMENTS
Supply Voltage
Supply Current
Supply Rejection
SYMBOL
CONDITIONS
MAX1240
V_DD
MAX1241
MAX1240A/B
MAX1240C
VV_DDDD
=
=
3.6V
3.6V
I_DD
Operating
mode
MAX1241A/B
MAX1241C
V_DD = 3.6V
V_DD = 5.25V
V_DD = 3.6V
V_DD = 5.25V
Power-down, digital inputs ^VDD ^{= 3.6V}
at 0V or V_DD
V_DD = 5.25V
PSR (Note 5)
MIN TYP MAX UNITS
2.7
3.6
V
2.7
5.25
1.4 2.0
1.4 3.5
0.9 1.5
mA
1.6 2.5
0.9 2.8
1.6 3.8
1.9 10
µA
3.5 15
±0.3
mV
TIMING CHARACTERISTICS (Figure 8)
(V_DD = +2.7V to +3.6V (MAX1240); V_DD = +2.7V to +5.25V (MAX1241); T_A = T_MIN to T_MAX, unless otherwise noted.)
PARAMETERS
Acquisition Time
SCLK Fall to Output Data Valid
CS Fall to Output Enable
CS Rise to Output Disable
SCLK Clock Frequency
SCLK Pulse Width High
SCLK Pulse Width Low
SCLK Low to CS Fall Setup Time
DOUT Rise to SCLK Rise (Note 5)
CS Pulse Width
SYMBOL
t_ACQ
t_DO
t_DV
t_TR
f_SCLK
t_CH
t_CL
t_CS0
t_STR
t_CS
CONDITIONS
CS = V_DD (Note 6)
Figure 1,
C_LOAD = 50pF
MAX124_ _C/E
MAX124_ _M
Figure 1, C_LOAD = 50pF
Figure 2, C_LOAD = 50pF
MIN TYP MAX
1.5
20
200
20
240
240
240
0
2.1
200
200
50
0
240
UNITS
µs
ns
ns
ns
MHz
ns
ns
ns
ns
ns
Note 1: Tested at V_DD = +2.7V.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range and
offset have been calibrated.
Note 3: MAX1240—internal reference, offset nulled; MAX1241—external reference (V_REF = +2.500V), offset nulled.
Note 4: External load should not change during conversion for specified accuracy.
Note 5: Guaranteed by design. Not subject to production testing.
Note 6: Measured as [V_FS(2.7V) - V_FS(V_DD(MAX)].
Note 7: To guarantee acquisition time, t_ACQ is the maximum time the device takes to acquire the signal, and is also the minimum
time needed for the signal to be acquired.
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