MAX1253 Datasheet, PDF (5/29 Pages) Maxim Integrated Products – Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and VDD Monitor

Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V_DD Monitor
TIMING CHARACTERISTICS
(V_DD = +2.7V to +3.6V (MAX1253), V_DD = +4.5V to +5.5V (MAX1254), T_A = T_MIN to T_MAX, unless otherwise noted.) (Figures 1, 2, and 4)
PARAMETER
SCLK Clock Period
SCLK Pulse Width High Time
SCLK Pulse Width Low Time
DIN to SCLK Setup Time
DIN to SCLK Hold Time
CS Fall to SCLK Rise Setup
SCLK Rise to CS Rise Hold
SCLK Fall to DOUT Valid
CS Rise to DOUT Disable
CS Fall to DOUT Enable
CS Pulse Width High
SYMBOL
t_CP
t_CH
t_CL
t_DS
t_DH
t_CSS
t_CSH
t_DOV C_L = 30pF
t_DOD C_L = 30pF
t_DOE C_L = 30pF
t_CSW
CONDITIONS
MIN TYP MAX UNITS
100 0.5
ns
45
ns
45
ns
25
ns
0
ns
25
ns
50
ns
50
ns
40
ns
40
ns
40
ns
Note 1: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain and offset errors
have been calibrated.
Note 2: Offset nulled.
Note 3: In reference mode 00, the reference system powers up for each temperature measurement. In reference mode 01, the ref-
erence system powers up once per sequence of channels scanned. If a sample wait <80µs is programmed, the reference
system is on all the time. In reference mode 10, the reference system is on all the time (see Table 7).
Note 4: No external capacitor on REF.
Note 5: The operational input voltage range for each individual input of a differentially configured pair (AIN0–AIN7) is from GND to
V_DD. The operational input voltage difference is from -VREF/2 to +VREF/2.
Note 6: See Figure 3 and the Sampling Error vs. Input Source Impedance graph in the Typical Operating Characteristics section.
Note 7: Grade A tested at +10°C and +55°C. -20°C to +85°C and -40°C to +85°C specifications guaranteed by design. Grade B
tested at +25°C. T_MIN to T_MAX specification guaranteed by design.
Note 8: External temperature measurement mode using an MMBT3904 (Diodes Inc.) as a sensor. External temperature sensing
from -40°C to +85°C; MAX1253/MAX1254 held at +25°C.
Note 9: Performing eight single-ended external channels’ temperature measurements, an internal temperature measurement, and
an internal V_DD measurement with no sample wait results in a conversion rate of 2ksps per channel.
Note 10: Performing eight single-ended voltage measurements, an internal temperature measurement, and an internal V_DD measure-
ment with no sample wait results in a conversion rate of 7ksps per channel.
Note 11: Performing eight single-ended voltage measurements, an internal temperature measurement, and an internal V_DD measure-
ment with maximum sample wait results in a conversion rate of 3ksps per channel.
Note 12: Defined as the shift in the code boundary as a result of supply voltage change. V_DD = min to max; full-scale input, mea-
sured using external reference.
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