ADC128S022 Datasheet, PDF (6/18 Pages) National Semiconductor (TI) – 8-Channel, 50 kSPS to 200 kSPS, 12-Bit A/D Converter

ADC128S022 Timing Specifications
The following specifications apply for V_A = V_D = +2.7V to +5.25V, AGND = DGND = 0V, f_SCLK = 0.8 MHz to 3.2 MHz, f_SAMPLE
= 50 kSPS to 200 kSPS, and C_L = 50pF. Boldface limits apply for T_A = T_MIN to T_MAX: all other limits T_A = 25˚C.
Symbol
Parameter
Conditions
Typical
Limits
(Note 7)
Units
t_CSH
CS Hold Time after SCLK Rising
Edge
(Note 9)
0
10
ns (min)
CS Setup Time prior to SCLK Rising
t_CSS
Edge
(Note 9)
4.5
10
ns (min)
t_EN
t_DACC
CS Falling Edge to DOUT enabled
DOUT Access Time after SCLK
Falling Edge
5
30
ns (max)
17
27
ns (max)
t_DHLD
DOUT Hold Time after SCLK Falling
Edge
4
ns (typ)
DIN Setup Time prior to SCLK
t_DS
Rising Edge
3
10
ns (min)
DIN Hold Time after SCLK Rising
t_DH
Edge
3
10
ns (min)
t_CH SCLK High Time
t_CL
SCLK Low Time
CS Rising Edge to DOUT
t_DIS
High-Impedance
DOUT falling
DOUT rising
0.4 x
t_SCLK
ns (min)
0.4 x
t_SCLK
ns (min)
2.4
20
ns (max)
0.9
20
ns (max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND = 0V, unless otherwise specified.
Note 3: When the input voltage at any pin exceeds the power supplies (that is, V_IN < AGND or V_IN > V_A or V_D), the current at that pin should be limited to 10 mA.
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 10 mA to two.
Note 4: The absolute maximum junction temperature (T_Jmax) for this device is 150˚C. The maximum allowable power dissipation is dictated by T_Jmax, the
junction-to-ambient thermal resistance (θ_JA), and the ambient temperature (T_A), and can be calculated using the formula P_DMAX = (T_Jmax − T_A)/θ_JA. In the 16-pin
TSSOP, θ_JA is 96˚C/W, so P_DMAX = 1,200 mW at 25˚C and 625 mW at the maximum operating ambient temperature of 105˚C. Note that the power consumption
of this device under normal operation is a maximum of 12 mW. The values for maximum power dissipation listed above will be reached only when the ADC128S022
is operated in a severe fault condition (e.g. when input or output pins are driven beyond the power supply voltages, or the power supply polarity is reversed).
Obviously, such conditions should always be avoided.
Note 5: Human body model is 100 pF capacitor discharged through a 1.5 kΩ resistor. Machine model is 220 pF discharged through ZERO ohms
Note 6: Reflow temperature profiles are different for lead-free packages.
Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Data sheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: Clock may be in any state (high or low) when CS goes high. Setup and hold time restrictions apply only to CS going low.
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