Rainbow Electronics MAX1299 - Manual (Page 5)

MAX1298/MAX1299
12-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS
(V
DD
= +4.75V to 5.25V (MAX1298), V
DD
= +2.7V to +3.6V (MAX1299), external reference, V
REF
= +2.5V (MAX1298), V
REF
= +1.2V
(MAX1299), f
SCLK
= 2.5MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Figures 4, 6)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SCLK Frequency f SCLK 2.5 MHz
SCLK Pulse Width Low t CL 200 ns
SCLK Pulse Width High t CH 200 ns
CS Low to SCLK High t CSS 100 ns
SCLK High to CS Setup t CSH 100 ns
CS Pulse Width t CS 100 ns
SCLK High to CS Low Setup t
CS0
50 ns
SCLK High to CS High Setup t CS1 100 ns
DIN Setup to SCLK High Time t DS 100 ns
DIN Hold Time t DH 0 ns
SCLK Fall to Output Data Valid t DO R L = 100k Ω, C
L = 50pF 150 ns
CS Fall to Output Enable t DV R L = 100k Ω, C
L = 50pF 150 ns
CS Rise to Output Disable t TR R L = 100k Ω, C
L = 50pF 50 ns
SSTRB Rise to SCLK Rise t SCLK 0 ns
SCLK Fall to SSTRB Fall t SSTRB 200 ns
Note 1: Tested at V DD = +5.0V (MAX1298) and V DD = +3.0V (MAX1299).
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 3: Conversion time is defined as the number of clock cycles (64 for voltage measurements, 125 for temperature measure-
ments) multiplied by the internal clock period.
Note 4: Individual analog input voltages cannot extend beyond the power-supply rails.
Note 5: Input resistance is typically 250M
Ω; 5µA limit reflects limitations in production testing.
Note 6: Specifications for full-on status assume continuous conversions. Power modes are software selected (Table 4).
Note 7: Measured at V
FS(+4.75V) - V FS(+5.25V) for the MAX1298 and at V FS(+2.7V) - V FS(+3.6V) for the MAX1299.
Note 8: External load should not change during conversions for specified accuracy.
Note 9: Excludes noise and self-heating effects. Output error for MAX129_C guaranteed by design.
Note 10: External temperature sensing over -40°C to +85°C range, device at +25°C. Guaranteed by design.