| Overview
|
| Diagrams
|
| Parametrics
|
| Documents
|
| Order
|
| Boards
|
| Packaging
|
| Tools
|
|
Features
| • | Mono and stereo inputs |
| • | Thermal Overload Protection |
| • | True-ground Headphone Drivers |
| • | I
2C Control Interface
|
| • | Input mute attenuation |
| • | 2nd Stage headphone attenuator |
| • | 32-step digital volume control |
| • | 10 Operating Modes |
| • | Minimum external components |
| • | Click and Pop suppression |
| • | Micro-power shutdown |
| • | Available in space-saving 3mm x 3mm 25 bump GR package |
| • | RF Suppression |
Description The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average power into a mono 8Ω
bridged-tied load (BTL) with 1% THD+N and with a 5V power supply. The LM49100 also has a stereo true-ground headphone amplifier
capable of 50mW per channel of continuous average power into a 32Ω single-ended (SE) loads with 1% THD+N.
The LM49100 has three input channels. One pair of SE inputs can be used with a stereo signal. The other input channel is fully
differential and may be used with a mono input signal. The LM49100 features a 32-step digital volume control and ten distinct
output modes. The mixer, volume control, and device mode select are controlled through an I
2C compatible interface.
Thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression
eliminates audible transients on power-up/down and during shutdown.
Key Specification
| ■
Power Output at VDD = 5V:
Loudspeaker (LS):
RL = 8Ω, THD+N
≤ 1%
|
1.275W
|
|
Headphone (VDDHP = 2.8V):
RL = 32Ω, THD+N
≤ 1%
|
50mW
|
| ■
Shutdown current
|
0.01µA
|
Applications
| • | Mobile Phones |
| • | PDAs |
| • | Laptops |
| • | Portable Electronics |
|
|
| |
| Parameters | Values |
|---|
| Power@ 8Ohms, 10% THD |
0.525 Watt |
| Power@ 8Ohms, 1% THD |
0.425 Watt |
| THD |
0.2 % |
| PSRR |
90 dB |
| Channels |
3 Channels |
| THD Conditions |
Headphone mode 4, f=1kHz, RL=32ohm, Pout=25mW |
| PSRR Conditions |
LS, Modes 1, 2, 10 |
| User Supply |
3.6 Volt |
| Capless Headphone |
No |
| ClassD Driver |
No |
| Interface |
I2C |
| Stereo Inputs |
2 |
| Digital Volume Control Max |
18 dB |
| Digital Volume Control Min |
-54 dB |
| Output Modes |
10 |
| Supply Range |
+2.7 - +5.5 V |
| Mono Inputs |
2 |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| Loudspeaker Type |
Class AB |
| Headphone Type |
True Ground |
| Loudspeaker Outputs |
2 |
|
Datasheet
Featured Application Notes
More Application Notes
Part Number(s)
(NSID) | Top View | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
|---|
LM49100GR/NOPB
RoHS | | Full production
Lead Time: 6 weeks
 |
| $3.35 each at 1K+ pcs | reel
of
1000 |
Part Number(s)
(NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
|---|
LM49100GREVAL
| Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier | Preliminary
| | Distributor | Region | Qty |
|---|
| NATIONAL |  | Worldwide | 34 |
| $400.00 each | 1 |
| The LM49100 is an integrated stereo subsystem with Class AB speaker or earpiece amplifier and ground referenced headphone amplifier in a 25-bump micro Array package. The LM49100 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.275W of average power into an 8 ohm load and 50 milliwatts of average power to a 32 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply to VDD_LS and a 2.8V power supply to VDD_HP.
The LM49100GREVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49100GR. The evaluation board comes with an I2C card and cable. It is an easy-to-use stand-alone board that requires power and GND, an I2C control signal, an input signal and an output load. Software for the product can be downloaded from http://audio.national.com
Features:
- Tiny and robust micro Array
- Very low iddq (5mA all outputs on at 5V)
- High output power (1.275W into 8ohms at 5V)
- 90dB PSRR 217Hz for speaker output
- 90dB PSRR 217Hz for headphone outputs
- 0.035% THD+N at 630mW for speaker output
- 0.02% THD+N at 25mW for headphone outputs
Applications:
- Mobile phones
- Portable devices, such as PMPs, Portable Navigation Devices
Contents:
- Fully Assembled LM49100GR Evaluation Board
- I2C interface card and cable
- Instructions for where to locate and download the datasheet
Please note: Go to http://audio.national.com for more information on using the LM49100GR evaluation kit. |
|
