Описание
The MAX9718/MAX9719 differential input audio power amplifiers are ideal for portable audio devices with internal speakers. The differential input structure improves noise rejection and provides common-mode rejection. A bridge-tied load (BTL) architecture minimizes external component count, while providing high-quality, power audio amplification. The MAX9718 is a single-channel amplifier while the MAX9719 is a dual-channel amplifier for stereo systems. Both devices deliver 1.4W continuous average power per channel to a 4O load with less than 1% THD+N while operating from a single +5V supply. The devices are available as adjustable gain amplifiers or with internally fixed gains of 0dB, 3dB, and 6dB to reduce component count. A shutdown input disables the bias generator and amplifiers and reduces quiescent current consumption to less than 100nA. The MAX9718 shutdown input can be set as active high or active low. These devices feature Maxim"s comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during startup and shutdown. The MAX9718 is pin compatible with the LM4895, and is available in 9-bump UCSP, 10-pin TDFN, and 10-pin µMAX packages. The MAX9719 is available in 16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP packages. Both devices operate over the -40°C to +85°C extended temperature range.
- 2.7V to 5.5V Single-Supply Operation
- Very High -93dB PSRR at 217Hz
- 1.4W into 4O at 1% THD+N (per Channel)
- Differential Input
- Internal Fixed Gain to Reduce Component Count
- Adjustable Gain Option (MAX9718A/H/MAX9719A)
- 100nA Low-Power Shutdown Mode
- No Audible Clicks or Pops at Power-Up/Down
- Improved Performance Pin-Compatible Upgrade to LM4895 (MAX9718D/G)
- 1.8V Logic Compatible
