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LM4985TM Fiches technique(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM4985TM
Description  Stereo 135mW Low Noise Headphone Amplifier with Selectable Capacitively Coupled or Output Capacitor-less (OCL) Output and Digitally Controlled (I2C) V
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4985TM Fiches technique(HTML) 9 Page - National Semiconductor (TI)

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Electrical Characteristics V
DD = 2.5V (Notes 1, 2) (Continued)
The following specifications apply for R
L =16
Ω, f = 1kHz, and C
B = 4.7µF unless otherwise specified. Limits apply to TA =
25˚C.
Symbol
Parameter
Conditions
LM4985
Units
(Limits)
Typ
(Note 6)
Limit
(Notes 7,
8)
A
VMAX
Maximum Gain
Code = 11111
18
dB
∆A
V
Gain Accuracy per Step
18dB
≥ A
V
≥ –44dB
–44dB
≥ A
V > –76dB
± 0.5
± 1.0
dB
V
OS
Output Offset Voltage
OCL
R
LOAD =32
V
IN =ACGND
2.0
mV
Note 1: All voltages are measured with respect to the GND pin unless otherwise specified.
Note 2: 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. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX,
θJA, and the ambient temperature, TA. The maximum
allowable power dissipation is PDMAX =(TJMAX -TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4985, see power derating
currents for more information.
Note 4: Human Body Model: 100pF discharged through a 1.5k
Ω resistor.
Note 5: Machine Model: 200pF
≤ Cmm ≤ 220pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: 10
Ω terminated input.
Note 10: The LDA10A package has its exposed-DAP soldered to an exposed 1.2in2 area of 1oz. Printed circuit board copper.
Note 11: The wake-up time (TWU) is calculated using the following formula; TWU =[CBYPASS (VDD)/2(IBYPASS)] + 40ms.
External Components Description (Figure 2)
Components
Functional Description
1.
C
I
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
high-pass filter with R
i at fc = 1/(2
πR
iCi). Refer to the section Proper Selection of External Components, for
an explanation of how to determine the value of C
i.
2.
C
S
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
3.
C
B
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of Proper
Components, for information concerning proper placement and selection of C
B
6.
C
o
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high pass filter with
R
L at fo = 1/(2
πR
LCo)
www.national.com
9


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