MAX971X General Description:
MAX9716/MAX9717音频功率放大器非常适合带有内置扬声器的便携式音频设备。
低功耗关机模式会禁用偏置发生器和放大器，将静态电流消耗降低到10nA以下。
MAX9717具有耳机感应输入（BTL/SE），可感应耳机何时连接到设备，禁用BTL从属驱动器，在将耳机作为单端负载驱动的同时静音扬声器。
The MAX9716/MAX9717 audio power amplifiers are ideal for portable audio devices with internal speakers. A bridge-tied load (BTL) architecture minimizes external component count, while providing high-quality audio reproduction. Both devices deliver 1.4W continuous power into a 4Ω load with less than 1% Total Harmonic Distortion (THD) while operating from a single +5V sup-ply. With an 8Ω load, both devices deliver 1W continuous power. These devices also deliver 350mW continuous power into an 8Ω load while operating from a single+3.0V supply. The devices are available as adjustable gain amplifiers (MAX9716/MAX9717A) or with internally fixed gains of 6dB, 9dB, and 12dB (MAX9717B/MAX9717C/MAX9717D), reducing component count.
A low-power shutdown mode disables the bias generator and amplifiers, reducing quiescent current consumption to less than 10nA. These devices feature Maxim’s industry-leading, comprehensive click-and-pop sup-pression that reduces audible clicks and pops during startup and shutdown.
The MAX9717 features a headphone sense input (BTL/SE) that senses when a headphone is connected to the device, disables the BTL slave driver, muting the speaker while driving the headphone as a single-ended load.
The MAX9716 is pin compatible with the LM4890 and is available in 9-bump UCSP™, 8-pin TDFN (3mm x 3mm), and 8-pin µMAX® packages. The MAX9717 is available in 9-bump UCSP, 8-pin TDFN, and 8-pin µMAX packages. Both devices operate over the -40°C to +85°C extended temperature range.
MAX971X Features:
2.7V to 5.5V Single-Supply Operation
1.4W into 4Ω at 1% THD+N
10nA Low-Power Shutdown Mode
73dB PSRR at 1kHz
No Audible Clicks or Pops at Power-Up/Down
Internal Fixed Gain to Reduce Component Count(MAX9717B/C/D)
Adjustable Gain Option (MAX9716/MAX9717A)
BTL/SE Input Senses when Headphones are Connected (MAX9717)
Pin Compatible with LM4890 (MAX9716)
Pin Compatible with TPA711 (MAX9717A)
Available in Compact, Thermally Enhanced µMAX and TDFN (3mm x 3mm) Packages
MAX971X Ordering Information:
PART
TEMP RANGE
PIN-PACKAGE
GAIN(dB)
MAX9716ETA+T
-40°C to +85°C
8 TDFN-EP*
Adj.
MAX9716EBL+TG45
-40°C to +85°C
3x3 UCSP
Adj.
MAX9716EUA
-40°C to +85°C
8 µMAX-EP*
Adj.
MAX9716EUA/V+
-40°C to +85°C
8 µMAX-EP*
Adj.
MAX971X Applications:
Mobile Phones
PDAs
Portable Devices
MAX971X Pin/Bump Configurations:
MAX971X Functional Diagrams/Typical Operating Circuits:
