LMC1992 datasheet(3/14 Pages) NSC

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Electrical Characteristics The following specifications apply for Va e 8V fIN e 1 kHz input signal applied to

channel 1 volume e 0 dB bass e 0 dB treble e 0 dB and faders e 0 dB unless otherwise specified All limits TA e TJ e

25 C (Continued)

Symbol

Parameter

Conditions

Typical

Limit

Units

(Note 6)

(Note 7)

(Limit)

Bass Gain Range

fIN e 100 Hz Pins 14 16

100

dB (min)

Bass Tracking Error

fIN e 100 Hz Pins 14 16

dB (max)

Bass Step Size

fIN e 100 Hz Pins 14 16

dB (min)

(Relative to Previous Level)

dB (max)

Treble Gain Range

fIN e 10 kHz Pins 14 16

100

dB (min)

Treble Tracking Error

fIN e 10 kHz Pins 14 16

dB (max)

Treble Step Size

fIN e 10 kHz Pins 14 16

dB (min)

(Relative to Previous Level)

dB (max)

Frequency Response

3 dB

450

kHz

03 dB (Relative to Signal Amplitude at 1 kHz)

kHz (min)

Channel Separation

VIN e 10 Vrms

dB (min)

Input-Input Isolation

VIN e 10 Vrms (Note 8)

dB (min)

PSRR

Power Supply Rejection Ratio

Va e 8VDC 100 mVP-P

dB (min)

100 Hz Sinewave Applied to Pin 28

fCLK

Clock Frequency

MHz (max)

VIN(1)

Logic ‘‘1’’ Input Voltage

V (min)

VIN(0)

Logic ‘‘0’’ Input Voltage

V (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 specified with respect to ground

Note 3

When the input voltage (VIN) at any pin exceeds the power supply voltages (VIN k Vb or VIN l Va) the absolute value of the current at that pin should be

limited to 5 mA or less The 20 mA package input current limits the number of pins that can exceed the power supply voltages with 5 mA current limit to four

Note 4

The maximum power dissipation must be de-rated at elevated temperatures and is dictated by TJMAX wJA and the ambient temperature TA The maximum

allowable power dissipation is PD e (TJMAX b TA) iJA or the number given in the Absolute Maximum Ratings whichever is lower For the LMC1992CCN TJMAX

125 C and the typical junction-to-ambient thermal resistance when board mounted is 67 CW

Note 5

Human body model 100 pF discharged through a 15 kX resistor

Note 6

Typicals are at TJ e 25 C and represent the most likely parametric norm

Note 7

Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level)

Note 8

The Input-Input Isolation is tested by driving one input and measuring the front outputs when the undriven inputs are selected

Note 9

The Volume Step Size is defined as the change in attenuation between any two adjacent volume attenuation settings The nominal Volume Step Size is

2 dB

Note 10

The Fader Step Size is defined as the change in attenuation between any two adjacent fader attenuation settings The nominal Volume Step Size is 2 dB

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