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Features
| • | Ground referenced outputs |
| • | High PSRR |
| • | Available in space-saving TSSOP package |
| • | Ultra low current shutdown mode |
| • | Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions |
| • | 1.4 - 3.6V operation |
| • | No output coupling capacitors, snubber networks, bootstrap capacitors |
| • | Shutdown either channel independently |
Description The LM4917 is a stereo, output capacitor-less headphone amplifier capable of delivering 95mW of continuous average power into a 16 load with less than 1% THD+N from a single 3V power supply.
The LM4917 provides high quality audio reproduction with minimal external components. A ground referenced output eliminates the output coupling capacitors typically required by single-ended loads, reducing component count, cost and board space consumption. This makes the LM4917 ideal for mobile phones and other portable equipment where board space is at a premium. Eliminating the output coupling capacitors also improves low frequency response.
The LM4917 operates from a single 1.4V to 3.6V power supply, features low 0.02% THD+N and 70dB PSRR. Independent right/left channel low-power shutdown controls provide power saving flexibility for mono/stereo applications. Superior click and pop suppression eliminates audible transients during start up and shutdown. Short circuit and thermal overload protection protects the device during fault conditions.
Key Specification
| Improved PSRR at 1kHz | 70dB (typ) |
| Power Output at VDD = 3V, RL = 16, THD <= 1% | 95mW (typ) |
| Shutdown Current | 0.01µA (typ) |
Applications
| • | Notebook PCs |
| • | Desktop PCs |
| • | Mobile Phone |
| • | PDAs |
| • | Portable electronic devices |
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| Parameters | Values |
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| Power@ 16Ohms, 1% THD |
0.097 Watt |
| Power@ 32Ohms, 1% THD |
0.082 Watt |
| Power@ 16Ohms, 10% THD |
0.108 Watt |
| Power@ 32Ohms, 10% THD |
0.108 Watt |
| THD |
0.02 % |
| PSRR |
70 dB |
| SNR |
100 dB |
| Channels |
2 Channels |
| THD Conditions |
Po=50mW, f=1kHz, Rl=32 Ohms |
| PSRR Conditions |
Vripple=200mW, f=1kHz |
| SNR Conditions |
RL=32 Ohms, Pout=20mW, f=1kHz |
| User Supply |
3 Volt |
| Shutdown Type |
Independent Low |
| Supply Range |
+1.4 - +3.6 V |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
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Datasheet
Featured Application Notes
More Application Notes
Part Number(s)
(NSID) | Description | Availability | Current Reported Stock | Budgetary Pricing | Standard Pack Size |
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LM4917SDBD
| LM4917 Ground-Referenced, 95mW Stereo Headphone Amplifier | Full production
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| $150.00 each | 1 |
| The LM4917 is a stereo, ground referenced, output capacitor-less headphone amplifier capable of delivering 95mW of continuous average power into a 16Ω load with less than 1% THD+N from a single 3V power supply.
This LM4917SDBD is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM4917SD. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load.
Features:
- Ground referenced outputs
- High PSRR
- Available in Space-saving LLP package
- Ultra low current shutdown mode
- Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
- 1.4 - 3.6V operation
- No output coupling capacitors, snubber networks, bootstrap capacitors
- Shutdown either channel independently
Applications:
- Notebook PC's
- Desktop PC's
- Mobile Phone
- PDA's
- Portable electronic devices
Contents:
- Fully Assembled LM4917SD Evaluation Board
- Instructions for where to locate and download the datasheet
Please note: application information and board layout can be found in datasheet |
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