LM4985TM/NOPB National Semiconductor, LM4985TM/NOPB Datasheet - Page 26

• Manufacturer Part Number: LM4985TM/NOPB
• Description: IC AMP AUDIO PWR .135W AB 12USMD
• Manufacturer: National Semiconductor
• Series: Boomer®r
• Type: Class ABr

Specifications of LM4985TM/NOPB

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 135mW x 2 @ 16 Ohm
• Voltage - Supply: 2.3 V ~ 5.5 V
• Features: I²C, Shutdown, Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 12-MicroSMD
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 135x2@16OhmW
• Audio Amplifier Function: Headphone
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 77dB
• Single Supply Voltage (min): 2.3V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 12
• For Use With: LM4985TMEVAL - BOARD EVALUATION LM4985TM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM4985TMTR

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I
Table 1 shows the actions that are implemented by manipulating the bits within the two internal I
2
Register
Register
Address
C Control Register
Control
Select
Mode
I2C
D7
D7
0
0
0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
WT1
A6
D6
D6
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
0
1
1
Table 1. LM4985 I
LM4985 I2C Contorl Register Addressing and Data Chart
WT0
A5
D5
D5
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
1
0
1
PHG
A4
D4
D4
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
1
0
2
C Control Register Addressing and Data Format Chart
SDCH1
D3
D3
A3
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
1
1
SDCH2
A2
D2
D2
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
1
0
1
26
CHSEL1
RS1
A1
D1
X
X
X
X
X
X
X
X
X
X
X
1
0
0
0
0
1
1
CHSEL2
RS0
A0
A0
D0
02
X
X
X
X
X
X
X
X
X
X
X
0
1
1
0
1
Amplifier’s Chan. 1 is Input 1,
Amplifier’s Chan. 1 is Input 1,
Amplifier’s Chan. 1 is Input 2,
Amplifier’s Chan. 1 is Input 2,
Wake-up time: 110ms (OCL),
Wake-up time: 170ms (OCL),
Wake-up time: 290ms (OCL),
Wake-up time: 80ms (OCL),
2
D7 must always be set to 0
Output capacitor-less mode
Output capacitor-less mode
Read and write the volume
C control registers.
Read and write the mode
Amplifier’s SHUTDOWN
Amplifier’s SHUTDOWN
1650ms (C-CUPL)
Chan 2. is Input 2
Chan 2. is Input 1
Chan 2. is Input 2
Chan 2. is Input 1
250ms (C-CUPL)
450ms (C-CUPL)
850ms (C-CUPL)
control register
control register
mode inactive
mode active
Illegal mode
Illegal mode
Function
inactive
active