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LM4985 데이터시트 PDF




National Semiconductor에서 제조한 전자 부품 LM4985은 전자 산업 및 응용 분야에서
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부품번호 LM4985 기능
기능 Stereo 135mW Low Noise Headphone Amplifier
제조업체 National Semiconductor
로고 National Semiconductor 로고


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LM4985 데이터시트, 핀배열, 회로
www.DataSheet4U.com
May 2006
LM4985
Stereo 135mW Low Noise Headphone Amplifier with
Selectable Capacitively Coupled or Output
Capacitor-less (OCL) Output and Digitally Controlled
(I2C) Volume Control
General Description
The LM4985 is a stereo audio power amplifier with internal
digitally controlled volume control. This amplifier is capable
of delivering 68mWRMS per channel into a 16load or
38mWRMS per channel into a 32load at 1% THD when
powered by a 3.6V power supply and operating in the OCL
mode.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. To that end, the LM4985 features two
functions that optimize system cost and minimize PCB area:
an integrated, digitally controlled (I2C bus) volume control
and an operational mode that eliminates output signal cou-
pling capacitors (OCL mode). Since the LM4985 does not
require bootstrap capacitors, snubber networks, or output
coupling capacitors, it is optimally suited for low-power, bat-
tery powered portable systems. For added design flexibility,
the LM4985 can also be configured for single-ended capaci-
tively coupled outputs.
The LM4985 features a current shutdown mode for mi-
cropower dissipation and thermal shutdown protection.
Key Specifications (VDD = 3.6V)
j PSRR: 217Hz and 1kHz
Output Capacitor-less (OCL)
fRIPPLE = 217Hz
fRIPPLE = 1kHz
Capacitor Coupled (C-CUPL)
77dB (typ)
76dB (typ)
fRIPPLE = 217Hz
fRIPPLE = 1kHz
j Output Power per channel
(fIN = 1kHz, THD+N = 1%),
RL = 16,OCL
VDD = 2.5V
VDD = 3.6V
VDD = 5.0V
j THD+N (f = 1kHz)
63dB (typ)
62dB (typ)
31mW (typ)
68mW (typ)
135mW (typ)
RLOAD = 16, OCL, POUT = 60mW
RLOAD = 32, OCL, POUT = 33mW
j Shutdown Current
0.60
0.031
0.1µA (typ)
Features
n OCL or capacitively coupled outputs (patent pending)
n I2C Digitally Controlled Volume Control
n Available in space-saving 0.4mm lead-pitch micro SMD
package
n Volume control range: –76dB to +18dB
n Ultra low current shutdown mode
n 2.3V - 5.5V operation
n Ultra low noise
Applications
n Mobile Phones
n PDAs
n Portable electronics devices
n MP3 Players
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201697
www.national.com




LM4985 pdf, 반도체, 판매, 대치품
Connection Diagrams
micro SMD Package
micro SMD Marking
20169715
Top View
Order Number LM4985TM
See NS Package Number TMD12AAA
Top View
X – Date Code
T – Die Traceability
G – Boomer Family
H2 – LM4985TM
20169730
Reference
A1
A2
A3
B1
B2
B3
C1
C2
C3
D1
D2
D3
Pin Reference, Name, and Function
Name
ADR
IN2
OUT2
SDA
BYPASS
CNTGND
SCL
GND
VDD
I2CVDD
IN1
OUT1
Function
I2C serial interface address input.
Analog signal input two.
Power amplifier two output.
I2C serial interface data input.
The internal VDD/2 ac bypass node.
In OCL mode, this is the ac ground
return. It is biased to VDD/2. Leave
unconnected for C-CUPL mode.
I2C serial interface clock input.
The LM4985’s power supply ground
input.
The LM4985’s power supply voltage
input.
I2C serial interface power supply
input. Can be connected to the same
supply that is connected to the VDD
pin.
Analog signal input one.
Power amplifier one output.
www.national.com
4

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LM4985 전자부품, 판매, 대치품
Electrical Characteristics VDD = 3.6V (Notes 1, 2) (Continued)
The following specifications apply for RL = 16, f = 1kHz, and CB = 4.7µF unless otherwise specified. Limits apply to TA =
25˚C.
Symbol
Parameter
Conditions
LM4985
Typ Limit
(Note 6) (Notes 7,
8)
Units
(Limits)
THD+N
VON
PSRR
RLOAD = 16OCL, PO = 60mW
Total Harmonic Distortion + Noise RLOAD = 16C-CUPL, PO = 60mW
RLOAD = 32OCL, PO = 33mW
RLOAD = 32C-CUPL, PO = 38mW
Output Noise Voltage
VIN = AC GND, AV = 0dB, A-weighted
VRIPPLE = 200mVp-p (Note 9)
fIN = 217Hz sinewave
OCL
Power Supply Rejection Ratio
C-CUPL
0.06
0.03
0.03
0.03
15
77
63
%
µV
55
dB (min)
fIN = 1kHz sinewave
OCL
C-CUPL
76 57
62
Xtalk
Channel-to-Channel Crosstalk
Pout = 40mW. OCL
RLOAD = 16
RLOAD= 32
Pout = 50mW. C-CUPL
RLOAD = 16
RLOAD= 32
CBYPASS= 4.7µF (Note 11)
WT1 = 0, WT0 = 0
OCL
C-CUPL
51
56
58
69
66 93
222
dB
dB
WT1 = 0, WT0 = 1
OCL
TWU
Wake Up Time from Shutdown
C-CUPL
WT1 = 1, WT0 = 0
OCL
C-CUPL
92
405
msec
143
774
WT1 = 1, WT0 =1
OCL
C-CUPL
246
1532
RIN Input Resistance
Stereo mode
Mono mode
20
k
10
AVMIN
AVMAX
AV
VOS
Minimum Gain
Maximum Gain
Gain Accuracy per Step
Output Offset Voltage
Code = 00000
Code = 11111
18dB AV –44dB
–44dB AV > –76dB
OCL
RLOAD = 32
VIN = AC GND
–76
18
± 0.5
± 1.0
2.0
–72
17
± 1.0
± 2.0
dB (max)
dB (min)
dB
20 mV (max)
7 www.national.com

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