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Differential bridged audio amplifiers

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MAXIM Integrated Products, represented by Arrow , has introduced the MAX9718 and MAX9719 fully differential, bridged audio amplifiers.

These amplifiers are suitable for portable audio applications where space limited such as PDAs, cell phones, and smart phones.

The MAX9718 is a single-channel amplifier, while the MAX9719 is a dual-channel amplifier for stereo systems. Both devices deliver 1.4W from a single 5V supply into a 4Ω load, and 475mW from a 3V supply into an 8Ω load.

The MAX9718 and MAX9719 feature a differential-input structure, offering noise immunity to improve audio reproduction in devices such as cellular phones.

The bridge-tied load (BTL) output stage drives the speaker differentially. This provides up to four times the output power of a conventional, single-ended output stage and eliminates the need for output-coupling capacitors, thus minimising external component count.

These devices are available in an open-loop, adjustable-gain configuration or with internally fixed gains of 0dB, 3dB, and 6dB to reduce component count. Other features include a low-power shutdown mode, clickless power-up/power-down, short-circuit protection, and thermal-overload protection.

The MAX9718 is available in 9-bump UCSP, 10-pin TDFN, and 10-pin microMAX packages and is pin-to-pin compatible with the LM4895. The MAX9719 is available in 16-bump UCSP, 16-pin TQFN, and 16-pin TSSOP packages.

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