The MAX98357A/MAX98357B is an easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class D amplifier that provides industry-leading Class AB audio performance with Class D efficiency. The digital audio interface automatically recognizes up to 35 different PCM and TDM clocking schemes which eliminates the need for I2C programming. Operation is further simplified by eliminating the need for an external MCLK signal that is typically used for PCM communication. Simply supply power, LRCLK, BCLK, and digital audio to generate audio! Furthermore, a novel pinout allows customers to use the cost-effective WLP package with no need for expensive vias (refer to Application Note 6643: Optimize Cost, Size, and Performance with MAX98357 WLP for more information).
The digital audio interface is highly flexible with the MAX98357A supporting I2S data and the MAX98357B supporting left-justified data. Both ICs support 8 channel time division multiplexed (TDM) data. The digital audio interface accepts specified sample rates between 8kHz and 96kHz for all supported data formats. The ICs can be configured to produce a left channel, right channel, or (left/2 + right/2) output from the stereo input data. The ICs operate using 16/24/32-bit data for I2S and left-justified modes as well as 16-bit or 32-bit data using TDM mode. The ICs eliminate the need for the external MCLK signal that is typically used for PCM communication. This reduces EMI and possible board coupling issues in addition to reducing the size and pin count of the ICs.
The ICs also feature a very high wideband jitter tolerance (12ns typ) on BCLK and LRCLK to provide robust operation.
Active emissions-limiting, edge-rate limiting, and overshoot control circuitry greatly reduce EMI. A filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices and reduces the component count of the solution.
The ICs are available in 9-pin WLP (1.345mm x 1.435mm x 0.64mm) and 16-pin TQFN (3mm x 3mm x 0.75mm) packages and are specified over the -40°C to +85°C temperature range.
|Part Number||Class||Spkr. Amp. VCC|
|Spkr. Amp. VCC|
|Spkr. Amp. ICC|
|POUT into 4Ω @ 1% THD+N|
|POUT into 4Ω @ 10% THD+N|
|POUT into 8Ω @ 1% THD+N|
|POUT into 8Ω @ 10% THD+N|
|Spkr. Amp. Half Pwr. THD+N|
|min||max||typ||min||min||min||min||A- Weighted||min||See Notes|
|See All Speaker Amplifiers (32)|
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C|
|Evaluation Board||8850||MAXAUDINT001 Evaluation Kit for the MAXQ2000/MAX98357A/MAX98357B/MAX98358 and MAX98371|
|Evaluation Board||8304||MAX98357EVSYS#TQFN Evaluation System for the MAX98357A and MAX98357B (TQFN)|
|Evaluation Board||8304||MAX98357DEV#TQFN Evaluation System for the MAX98357A and MAX98357B (TQFN)|
|Evaluation Board||8303||MAX98357EVSYS#WLP Evaluation System for the MAX98357A and MAX98357B (WLP)|
|Evaluation Board||8303||MAX98357DEV#WLP Evaluation System for the MAX98357A and MAX98357B (WLP)|