MAX4060/MAX4061/MAX4062 are differential-input microphone preamplifiers optimized for notebook and PDA audio systems. These devices feature adjustable gain with excellent power-supply rejection and common-mode rejection ratios, making them ideal for low-noise applications in portable audio systems. The MAX4060/MAX4062 are capable of switching their output between the differential input and a single-ended auxiliary microphone amplifier input. In addition, the MAX4060/MAX4062 have a low-noise microphone bias generator. The differential gain of the MAX4061/MAX4062 is set with a single resistor. The MAX4060 has a fixed gain of 10V/V and is PC99/2001 compliant. The MAX4061 includes a complete shut-down mode. In shutdown, the supply current is reduced to 0.3µA and the current to the microphone bias is cut off for ultimate power savings. The MAX4060 operates from a 4.5V to 5.5V single sup- ply and the MAX4061/MAX4062 operate from 2.4V to 5.5V. All devices are specified over the extended oper- ating temperature range, -40°C to +85°C. The MAX4060/MAX4061 are available in tiny 8-pin TDFN (3mm x 3mm x 0.8mm) and 8-pin µMAX® packages. The MAX4062 is available in a 10-pin µMAX package.
The MAX4060, MAX4061, and MAX4062 are differential‑input microphone preamplifiers optimized for notebook and PDA audio systems. They feature adjustable or fixed gain, high power‑supply and common‑mode rejection, rail‑to‑rail outputs, and an internal bias generator. The MAX4061 includes a complete shutdown mode that reduces supply current to sub‑microamp levels for power savings.
These devices operate from low single‑supply voltages (2.4 V‑5.5 V) and are offered in space‑saving 8‑pin TDFN, 8‑pin µMAX and 10‑pin µMAX packages. Typical applications include portable audio, USB audio peripherals, and other low‑noise audio front‑ends where board‑space and power efficiency are critical.
| Fixed Gain (MAX4060) | 10 V/V |
|---|---|
| Adjustable Gain (MAX4061/4062) | Set by external resistor between G1 and G2 |
| THD+N (MAX4060) | 0.04 % at 1 kHz |
| Power‑Supply Rejection Ratio | 86 dB at 1 kHz |
| Common‑Mode Rejection Ratio | 70 dB at 1 kHz |
| Supply Current (MAX4060) | 0.75 – 1.2 mA |
Gain is set by connecting a single external resistor between pins G1 and G2.
The THD+N is 0.04 % at 1 kHz.