The following specifications apply for V

Symbol

Parameter

Conditions

LM4855

Units

(Limits)

Typical

(Note 5)

Limits

(Note 6)

Digital Volume Range (R

L

Input referred minimum gain

-34.5

-35.1

-33.9

dB (min)

dB (max)

Input referred maximum gain

12.0

11.4

12.6

dB (min)

dB (max)

Digital Volume Stepsize

1.5

dB

Digital Volume Stepsize Error

dB ( max)

Phone_In_IHF Volume

BTL gain from Phone_In _IHF to

SPKR

OUT

12

11.4

12.6

dB (min)

dB (max)

Phone _In_IHF Mute Attenuation

Output Mode 2, 4, 6

80

72

dB (min)

Phone_In_IHF Input Impedance

20

15

25

k

Ω (min)

k

Ω (max)

Phone_In_HS Input Impedance

Maximum gain setting

50

37.5

62.5

k

Ω (min)

k

Ω (max)

Mininum gain setting

100

75

125

k

Ω (min)

k

Ω (max)

R

Maximum gain setting

33.5

25

42

k

Ω (min)

k

Ω (max)

Mininum gain setting

100

75

125

k

Ω (min)

k

Ω (max)

t

SD

Thermal Shutdown Temperature

170

150

˚C (min)

t

ES

Enable Setup Time (ENB)

20

ns (min)

t

EH

Enable Hold Time (ENB)

20

ns (min)

t

EL

Enable Low Time (ENB)

30

ns (min)

t

DS

Data Setup Time (DATA)

20

ns (min)

t

DH

Data Hold Time (DATA)

20

ns (min)

t

CS

Clock Setup Time (CLK)

20

ns (min)

t

CH

Clock Logic High Time (CLK)

50

ns (min)

t

CL

Clock Logic Low Time (CLK)

50

ns (min)

f

CLK

Clock Frequency

DC

10

(min)

MHz (max)

Note 2: Absolute Maximum Rating indicate limits beyond which damage to the device may occur.

Note 3: 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 4: Human body model, 100pF discharged through a 1.5k

Ω resistor.

Note 5: Typical specifications are specified at +25˚C and represent the most likely parametric norm.

Note 6: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 7: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200pF cap is charged to the specified voltage, then discharged directly into the

IC with no external series resistor (resistance of discharge path must be under 50

Ω).

Note 8: All voltages are measured with respect to the ground pin, unless otherwise specified.

Note 9: The given

Note 10: Please refer to the Output Noise vs Output Mode table in the Typical Performance Characteristics section for more details.

www.national.com

6