CLC5957PCASM datasheet(5/16 Pages) NSC

5 / 16 page

Converter Electrical Characteristics (Continued)

The following specifications apply for AV

CC =DVCC = +5V, 66MSPS. Boldface limits apply for TA =Tmin = −40˚C to Tmax =

+85˚C, all other limits T

A = 25˚C (Note 3).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

POWER REQUIREMENTS

Total Operating Supply Current (Note

128

150

Power Dissipation (Note 2)

640

750

Power Supply Rejection Ratio

Note 1: “Absolute Maximum Ratings” are limiting values, to be applied individually, and beyond which the serviceability of the circuit may be impaired. Functional

operability under any of these conditions is not necessarily implied. Exposure to maximum ratings for extended periods may affect device reliability.

Note 2: These parameters are guaranteed by test.

Note 3: Typical specifications are based on the mean test values of deliverable converters from the first three diffusion lots.

Note 4: Values guaranteed based on characterization and simulation.

Note 5: See page 14, Figure 3 for ENCODE inputs circuit.

Note 6: CL = 7pF DATA; 10pF DAV.

Note 7: The absolute maximum junction (TJmax) temperature for this device is 175˚C. The maximum allowable power dissipation is dictated by TJmax, the

junction-to-ambient thermal resistance (

θJA), and the ambient temperature (TA), and can be calculated using the formula PDmax=(TJmax – TA)/θJA. For the 48-pin

TSSOP,

θJA is 56˚C/W, so PDmax = 2.68W at 25˚C and 1.6W at the maximum operating ambient temperature of 85˚C. Note that the power dissipation of this device

under normal operation will typically be about 650 mW (640 mW quiescent power + 10 mW due to 1 TTL load on each digital output). The values of absolute

maximum power dissipation will only be reached when the CLC5957 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.

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