Click here for production status of specific part numbers. MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown General Description The 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 commonmode rejection ratios, making them ideal for lownoise 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 shutdown mode. In shutdown, the supply current is reduced to 0.3A 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 supply and the MAX4061/MAX4062 operate from 2.4V to 5.5V. All devices are specified over the extended operating temperature range, -40C to +85C. The MAX4060/ MAX4061 are available in tiny 8-pin TDFN (3mm x 3mm x 0.8mm) and 8-pin MAX(R) packages. The MAX4062 is available in a 10-pin MAX package. Features 2.4V to 5.5V Single-Supply Operation Adjustable Gain or Fixed-Gain Options High PSRR (86dB at 1kHz) High CMRR (70dB at 1kHz) Low Input-Referred Noise Integrated Microphone Bias 750A Supply Current 0.3A Shutdown Current 4kV ESD Protection (AUX_IN) Rail-to-Rail Outputs THD+N: 0.04% at 1kHz Available in Space-Saving Packages * 8-Pin TDFN (MAX4060/MAX4061) * 8-Pin MAX (MAX4060/MAX4061) * 10-Pin MAX (MAX4062) Typical Operating Circuit 2.4V TO 5.5V BIAS 4 VCC Applications Notebook Audio Systems Tablet PCs PDA Audio Systems Ordering Information PART MAX4060ETA+ MAX4060EUA+ MAX4061ETA+ MAX4061EUA+ MAX4062EUB+ TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C 8 AUX_IN x10 INT/AUX 1 BIAS PINPACKAGE 8 TDFN-EP* 8 MAX 8 TDFN-EP* 8 MAX 10 MAX TOP MARK ABY -- ABZ -- -- *EP = Exposed pad. +Denotes a lead(Pb)-free/RoHS-compliant package. Pin Configurations and Selector Guide appear at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. 19-2408; Rev 4; 11/18 MAX4060 USB Audio Peripherals AES-42-Compliant Microphones Signal Conditioning OUT 2 5 IN+ x10 6 IN- BIAS BIAS 3 VBIAS GND 7 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Absolute Maximum Ratings Supply Voltage (VCC to GND). ................................-0.3V to +6V Any Other Pin to GND............................... -0.3V to (VCC + 0.3V) Duration of Short Circuit to GND or VCC...................Continuous Continuous Input Current (any pin)...................................10mA Continuous Power Dissipation (TA = +70C) 8-Pin TDFN (derate 24.4mW/C above +70C)......1951.2mW 8-Bump MAX (derate 4.8mW/C above +70C)......387.8mW 10-Bump MAX (derate 8.8mW/C above +70C)....707.3mW Operating Temperature Range............................ -40C to +85C Junction Temperature.......................................................+150C Storage Temperature Range............................. -65C to +150C Lead Temperature (soldering, 10s).................................. +300C Soldering Temperature (reflow)........................................+260C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (VCC = 3V for MAX4061/MAX4062, VCC = 5V for MAX4060, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG = 11.11k, RL = 100k to 1.5V, RBIAS = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER SYMBOL Supply Voltage Range VCC Supply Current ICC Output Common-Mode Voltage Slew Rate Supply Current in Shutdown Output Short-Circuit Current VOCM SR ISHDN ISC CONDITIONS Inferred from PSRR test MIN VOS Common-Mode Input Voltage Range VCM Maximum Differential Input Voltage Small-Signal Bandwidth Input Resistance Input Resistance Match VDIFFMAX BW-3dB RIN RMATCH Input Noise-Voltage Density en RMS Output Noise Voltage VNRMS www.maximintegrated.com MAX 2.4 5.5 MAX4060 4.5 5.5 1.25 AV = 10V/V 0.75 1.2 1.5 1.75 1 VSHDN = 0V, MAX4061 30 To VCC 30 AV = 1V/V, MAX4061/MAX4062 V mA V 1 A mA 0.1 1 UNITS V/s 0.001 To GND DIFFERENTIAL INPUT (VINT/AUX = 0V for MAX4060/MAX4062, default for MAX4061) Input Offset Voltage TYP MAX4061/MAX4062 5 mV 2 V 1 V 600 kHz Either differential input 100 k 1 % AV = 10V/V, f = 1kHz 100 AV = 100V/V, f = 1kHz, MAX4061/MAX4062 only 20 AV = 10V/V, BW = 22Hz to 22kHz 125 nV/Hz VRMS Maxim Integrated 2 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Electrical Characteristics (continued) (VCC = 3V for MAX4061/MAX4062, VCC = 5V for MAX4060, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG = 11.11k, RL = 100k to 1.5V, RBIAS = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER SYMBOL Total Harmonic Distortion Plus Noise THD+N Differential Gain AVDIFF Common-Mode Rejection Ratio CMRR Power-Supply Rejection Ratio PSRR CONDITIONS MIN AV = 10V/V, f = 1kHz, VOUT = 0.7VRMS, BW = 22Hz to 22kHz 0.04 1.13 1.3 10 10.4 96 100 104 1V < VCM < 2V, VOUT = 0.7VRMS, MAX4060 9.6 10.0 10.4 TA = +25C 72 RG = 1.01k VCM = 500mVP-P, f = 1kHz TA = TMIN to TMAX 70 Input Noise-Voltage Density en dB dB 86 BW-3dB RIN V/V 89 60 AUXILIARY INPUT (MAX4060/MAX4062, INT/AUX = VCC) Input Resistance UNITS % 1 RG = 11.11k VCC = 5V 100mV, f = 1kHz Small-Signal Bandwidth MAX 9.6 1V < VCM < 2V, VOUT = 0.7VRMS, MAX4061/MAX4062 RG = open TYP 200 kHz 100 k f = 1kHz 45 nV/Hz RMS Output Noise Voltage VNRMS BW = 22Hz to 22kHz 385 VRMS Total Harmonic Distortion Plus Noise THD+N f = 1kHz, BW = 22Hz to 22kHz 0.05 % Power-Supply Rejection Ratio PSRR Voltage Gain AVAUX BIAS OUTPUT (MAX4060/MAX4062) Output Voltage Output Resistance Output Noise Voltage www.maximintegrated.com VOUT ROUT VNRMS TA = +25C TA = TMIN - TMAX VOUT = 0.7VRMS 65 90 dB 50 -10.7 -10 IBIAS = 0.8mA to GND, MAX4060 2 2.2 IBIAS = 0.5mA to GND, MAX4062 2 2.2 IBIAS = 0.8mA to GND, MAX4060 (TA = +25C) 2 2.5 IBIAS = 0.5mA to GND, MAX4062 (TA = +25C) 22 IBIAS = 0.8mA to GND, BW = 22Hz to 22kHz, MAX4060 50 IBIAS = 0.5mA to GND, BW = 22Hz to 22kHz, MAX4062 20 -9.3 V/V V k 40 VRMS Maxim Integrated 3 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Electrical Characteristics (continued) (VCC = 3V for MAX4061/MAX4062, VCC = 5V for MAX4060, VGND = 0V, VSHDN = VCC, VINT/AUX = 0V, RG = 11.11k, RL = 100k to 1.5V, RBIAS = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MAX4060 Power-Supply Rejection Ratio PSRR MAX4062 IBIAS = 0.8mA to GND, VCC = 4.5V to 5.5V MIN TYP 50 80 IBIAS = 0.8mA, VCC = 5V + 100mVP-P, f = 1kHz IBIAS = 0.5mA to GND, VCC = 2.4V to 5.5V MAX UNITS 70 dB 50 IBIAS = 0.5mA, VCC = 3V + 100mVP-P, f = 1kHz 74 71 DIGITAL INPUTS (SHDN for MAX4061 and INT/AUX for MAX4060/MAX4062) Input Leakage Current IIN Input-Voltage High VINH Input-Voltage Low VINL Shutdown Enable Time Shutdown Disable Time tON tOFF VIN = 0V or VCC 1 0.7 x VCC A V 0.3 x VCC V MAX4061 10 s MAX4061 10 s Note 1: All specifications are 100% tested at TA = +25C. Specification limits over temperature (TA = TMIN to TMAX) are guaranteed by design, not production tested. Note 2: MAX4062 requires a 1F capacitor from BIAS to ground. www.maximintegrated.com Maxim Integrated 4 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Typical Operating Characteristics (VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL 100k to 1.5V, SHDN = VCC (MAX4061 only), TA = +25C, unless otherwise noted.) PSRR (dB) -6 10 100 1k 10k 100k AV = 100V/V 10 100 1k 10k 100k 0 1M -40 -25 -10 5 20 35 50 65 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE OUTPUT-VOLTAGE HIGH vs. TEMPERATURE 0.5 0.4 0.3 0.2 AV = 10V/V NO LOAD 2.5 3.0 3.5 4.0 4.5 5.0 5.5 MAX4060 toc05 0.1 10 0.01 ILOAD = 50A 0.001 -40 -15 10 35 60 1 85 -40 -15 10 35 60 TEMPERATURE (C) TEMPERATURE (C) OUTPUT-VOLTAGE LOW vs. TEMPERATURE OUTPUT-VOLTAGE HIGH vs. LOAD CURRENT OUTPUT-VOLTAGE LOW vs. LOAD CURRENT VOH = VCC - VOUT 150 VOH (mV) VOL (mV) 200 100 75 -15 10 35 TEMPERATURE (C) www.maximintegrated.com 60 50 25 85 0 VCC = 3V 150 100 50 ILOAD = 50A 250 VCC = 3V 125 10 300 85 MAX4060 toc09 MAX4060 toc07 175 ILOAD = 2.5mA -40 ILOAD = 2.5mA SUPPLY VOLTAGE (V) 1000 100 1 VOL (mV) 2.0 VOH = VCC - VOUT 100 MAX4060 toc08 0.1 10 1000 VOH (mV) 0.6 100 80 MAX4060 toc06 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX4060 toc04 TEMPERATURE (C) SHUTDOWN SUPPLY CURRENT (nA) SUPPLY CURRENT (mA) 0.4 FREQUENCY (Hz) 0.7 1 VCC = 3V 0.6 FREQUENCY (Hz) 0.8 0 -120 1M VCC = 5V 0.2 -100 -12 0.9 AV = 10V/V -80 -9 -15 -60 SUPPLY CURRENT vs. TEMPERATURE 0.8 SUPPLY CURRENT (mA) -20 -40 -3 1.0 MAX4060 toc02 VCC = 5V 0 GAIN (dB) 0 MAX4060 toc01 3 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (DIFF INPUT) MAX4060 toc03 GAIN vs. FREQUENCY (NO LOAD) 0 1 2 3 LOAD CURRENT (mA) 4 5 0 0 1 2 3 4 5 LOAD CURRENT (mA) Maxim Integrated 5 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Typical Operating Characteristics (continued) (VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL 100k to 1.5V, SHDN = VCC (MAX4061 only), TA = +25C, unless otherwise noted.) 2.200 2.175 VCC = 3V 0.1 THD+N (%) 2.225 VCC = 5V 0.01 VOUT = 2.26VP-P MAX4060 toc12 VOUT = 2.26VP-P 2.250 1 MAX4060 toc11 1 THD+N (%) MIC BIAS VOLTAGE (V) 2.275 IBIAS = 800mA TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (AUX INPUT) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (DIFF INPUT) MAX4060 toc10 2.300 MAX4060 MIC BIAS VOLTAGE vs. TEMPERATURE VCC = 3V 0.1 VCC = 5V 0.01 2.150 2.125 2.100 -40 -15 10 35 60 85 0.001 100 1k 10k 100k 0.001 10 100 1k 10k FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (DIFF INPUT, VCC = 3V) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (DIFF INPUT, VCC = 5V) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (AUX INPUT, VCC = 3V) f = 1kHz 10 BW = 22kHz 1 THD+N (%) 1 THD+N (%) f = 1kHz 0.1 BW = 22kHz MAX4060 toc14 10 MAX4060 toc13 BW = 22kHz MAX4060 toc15 FREQUENCY (Hz) 1 0.1 0.1 f = 1kHz f = 10kHz f = 10kHz 0.001 f = 10kHz 0.01 0.01 0 0.5 1.0 1.5 2.0 2.5 3.0 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 0.01 3.5 0.001 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (VP-P) OUTPUT VOLTAGE (VP-P) OUTPUT VOLTAGE (VP-P) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (AUX INPUT, VCC = 5V) INPUT-REFERRED NOISE vs. FREQUENCY (DIFF INPUT) MAX4060 MIC BIAS OUTPUT NOISE BW = 22kHz 700 (nV/Hz) 0.1 VCC = 5V BW = 22Hz TO 22kHz 600 1 f = 1kHz 3.0 MAX4060 toc18 MAX4060 toc17 800 MAX4060 toc16 10 THD+N (%) 100k TEMPERATURE (C) 10 THD+N (%) 10 500 400 5V/div 300 f = 10kHz 0.01 200 100 0.001 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (VP-P) www.maximintegrated.com 3.0 3.5 0 10 100 1k 10k 100k 100ms/div FREQUENCY (Hz) Maxim Integrated 6 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Typical Operating Characteristics (continued) (VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL 100k to 1.5V, SHDN = VCC (MAX4061 only), TA = +25C, unless otherwise noted.) SMALL-SIGNAL TRANSIENT RESPONSE FOR DIFF INPUT MAX4062 MIC BIAS OUTPUT NOISE MAX4060 toc20 MAX4060 toc19 VCC = 5V BW = 22Hz TO 22kHz INPUT 5mV/div 5V/div OUTPUT 50mV/div 100ms/div 10s/div SMALL-SIGNAL TRANSIENT RESPONSE FOR AUX INPUT LARGE-SIGNAL TRANSIENT RESPONSE FOR DIFF INPUT MAX4060 toc22 MAX4060 toc21 INPUT 100mV/div INPUT 5mV/div OUTPUT 1V/div OUTPUT 50mV/div 10s/div 10s/div LARGE-SIGNAL TRANSIENT RESPONSE FOR AUX INPUT OUTPUT OVERDRIVEN MAX4060 toc23 INPUT 200mV/div MAX4060 toc24 DIFFERENTIAL INPUT INPUT 500mV/div OUTPUT 1V/div 10s/div www.maximintegrated.com OUTPUT 1V/div 10s/div Maxim Integrated 7 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Pin Description PIN NAME FUNCTION 2 INT/AUX Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select internal or high to select auxiliary microphone input. 3 3 OUT Amplifier Output. OUT is high impedance when in shutdown mode. 3 -- -- BIAS External Electret Microphone Capsule Bias Output. BIAS has a greater than 2k output impedance. 4 4 5 5 5 6 VCC Power Supply. Bypass the VCC to GND with a 0.1F capacitor. 6 6 7 IN- 7 7 8 GND 8 -- 9 AUX_IN -- 1 1 G2 -- 2 -- SHDN Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown mode. -- -- 4 BIAS External Electret Microphone Capsule Bias Output. Bypass BIAS with 1F capacitor to ground. -- 8 10 G1 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. -- -- -- EP Exposed Pad (TDFN Only). Internally connected to GND. Connect to a large ground plane to minimize thermal performance. Not intended as an electrical connection point. MAX4060 MAX4061 MAX4062 1 -- 2 IN+ Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+. Inverting Differential Amplifier Input. AC-couple the audio signal into IN-. Ground Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into AUX_IN. Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. (See Adjustable Differential-Gain Setting section.) Detailed Description The MAX4060/MAX4061/MAX4062 are differential microphone preamplifiers providing high-quality audio, optimized for use in computer and mobile applications. These devices feature rail-to-rail outputs, very high power-supply rejection, and common-mode rejection, making them ideal for low-noise applications. The MAX4060/MAX4061/ MAX4062 are particularly effective when layout constraints force the microphone amplifier to be physically remote from the ECM microphone and/or the rest of the audio circuitry. The MAX4060/MAX4062 are capable of switching their output between the differential input and an inverting single-ended input. INT/AUX selects either the differential input or single-ended auxiliary input. In addition, the MAX4060 has an internal bias generator to bias the microphone in either differential or single-ended modes. The MAX4061 includes a complete 0.3A shutdown www.maximintegrated.com mode for ultimate power savings. The differential gain of the MAX4061/MAX4062 is set with a single resistor connected between the G1 and G2 pins. The MAX4060 has a fixed gain of 10V/V. Differential Input The main microphone input is a low-noise, differential input structure. This is an almost essential element when faced with amplification of low-amplitude analog signals in digitally intense environments such as notebook PCs or PDAs. Used correctly, the advantages over a singleended solution are: Better power-supply noise rejection. Less degradation from noise in PC board ground planes. The microphone and preamplifier can be placed physically further apart, easing PC board layout restrictions. Maxim Integrated 8 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Functional Diagram 2.4V TO 5.5V BIAS 4 VCC MAX4060 8 AUX_IN x10 INT/AUX 1 BIAS OUT 2 5 IN+ x10 6 IN- BIAS BIAS 3 VBIAS GND 7 Fixed Differential Gain (MAX4060) Input Capacitors The MAX4060 has an internal fixed gain of 10V/V for its differential input. This feature simplifies design, reduces pin count, footprint, and eliminates external gain-setting resistors. The two differential microphone inputs and the single-ended auxiliary input of the MAX4060/MAX4061/ MAX4062 have on-chip bias components, allowing the user to AC-couple any signals onto the input. The input resistance is 100k (typ), so the capacitor size may be chosen accordingly to define the LF rolloff desired. This can be calculated as: Adjustable Differential-Gain Setting The MAX4061/MAX4062 allow the user to alter the gain to optimize the signal-to-noise ratio (SNR) of their system. The gain is set by a single external resistor (RG) connected between the G1 and G2 pins, where: RG = 100k / (AV - 1) where AV is the required voltage gain. Hence, an 11.11k resistor yields a gain of 10V/V, or 20dB. Leaving the pins unconnected results in a gain of 1V/V. Gain for the MAX4061/MAX4062 is defined as: AV = VOUT / (VIN+ - VIN-) The resistor can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control. www.maximintegrated.com CIN = 1 / (2fCUTRIN) This assumes a low source impedance driving the inputs. A further consideration for the differential input is the effect of these series input capacitors on low-frequency, common-mode rejection. Any mismatch in the values of these two capacitors degrades the CMRR at frequencies where the impedance of the capacitor is significant compared to the input resistance of the amplifier--this is usually most noticeable at low frequencies. One way to avoid the need for matched or tight tolerance capacitors is to deliberately oversize the values on the differential Maxim Integrated 9 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 2.4V TO 5.5V 5 100k RBIAS VCC 4 BIAS VBIAS CBIAS MAX4062 9 AUX_IN x10 INT/AUX 2 OUT 3 6 IN+ 7 IN- G1 10 G2 1 GND 8 Figure 1. MAX4062 with Auxiliary Input Configuration inputs and to set the lower 3dB point (fCUT) of the amplifier by sizing the output capacitor appropriately. The input impedance matching on the differential input is typically 1%, allowing input capacitor matching to be effective at improving low-frequency PSRR. Common-Mode Rejection Ratio The common-mode rejection ratio (CMRR) refers to the amount of rejection that the amplifier is capable of providing to any signal applied equally to the IN+ and INinputs. In the case of amplifying low-level microphone signals in noisy digital environments, it is a key figure of merit. In audio circuits, this is generally measured for VIN as an AC signal: CMRR(dB) = ADM / ACM where ADM is the differential gain, ACM is the commonmode gain. Auxiliary Input The auxiliary input is a single-ended input intended to be used with a jack-socket-type microphone input (Figure 1). Internal DC-bias components (as on the main inputs) allow the input signal to be AC-coupled. Mechanically switched jack sockets can be used in conjunction with the INT/AUX select pin, allowing the auxiliary microphone input to be automatically selected when a jack socket is inserted. Microphone Bias Voltage MAX4060 The MAX4060 has a microphone bias voltage designed to comply with the Microsoft/Intel PC99/2001 audio standard. It features source impedance of greater than 2k, and delivers more than 2V of bias when loaded with a current of 800A. This limits operation of this part to supplies between 4.5V to 5.5V (see Figure 2). Input voltages are sufficiently small such that the output is not clipped in either differential or common-mode application. The topology used in the MAX4061/MAX4062 means that the CMRR actually improves at higher differential gains--another advantage of using differential sensing. www.maximintegrated.com Maxim Integrated 10 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 4.5V TO 5.5V 4 VCC MICROPHONE INPUT MAX4060 8 AUX_IN x10 3 BIAS RBIAS INT/AUX 1 OUT 2 VBIAS 5 IN+ x10 6 INGND 7 Figure 2. MAX4060 Used for Biasing a Microphone MAX4061/MAX4062 The MAX4062 has a lower bias voltage and low-impedance outputs (optimum electret bias resistor can then be set externally). This gives a low-noise, flexible solution that can run from 2.4V to 5.5V, suitable for handheld devices such as PDAs that typically have audio power supplies in the 3V region (see Figure 3). In applications where the differential microphone is placed some distance from the MAX4060/MAX4061/MAX4062, using a remote differential bias scheme as shown in Figure 4 can provide improved noise rejection. Output MAX4060/MAX4061 DC Bias The output voltage has a DC-bias voltage independent of the power supplies, resulting in superior PSRR performance. The MAX4061 output is high impedance when the part is in shutdown mode. AC-coupling the output into the next audio stage (e.g., CODEC) is recommended. www.maximintegrated.com Applications Information Shutdown Mode The MAX4061 features a low-power, complete shutdown mode. When SHDN goes low, the supply current drops to 0.3A, the output enters a high-impedance state, and the bias current to the microphone is switched off. Driving SHDN high enables the amplifier. SHDN should not be left unconnected. Power Supplies and Layout The MAX4060 operates from a 4.5V to 5.5V single supply and the MAX4061/MAX4062 operate from a 2.4V to 5.5V single supply. Bypass the power supply with a 0.1F capacitor to ground. In systems where analog and digital grounds are available, the MAX4060/MAX4061 should be connected to the analog ground. Maxim Integrated 11 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 2.4V TO 5.5V 5 VCC 4 BIAS 0.1F VBIAS 9 AUX_IN MAX4062 x10 0.1F 2.2k RG 11k 2.2k INT/AUX 2 10 G1 0.1F OUT 3 1 G2 6 IN+ 7 IN0.1F GND 8 Figure 3. MAX4062 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input www.maximintegrated.com Maxim Integrated 12 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 2.4V TO 5.5V 5 VCC 4 BIAS VBIAS MAX4062 0.1F 9 AUX_IN 2.2k x10 0.1F VDD INT/AUX 2 10 G1 1k 1k 2.2F RG 11k OUT 3 1 G2 0.1F 6 IN+ 7 IN1k 0.1F GND 8 1k 2.2F Figure 4. Remote Differential Microphone Bias Network Optimizes Noise Rejection in Long-Run, PC Board Traces Pin Configurations TOP VIEW INT/AUX 1 8 AUX_IN OUT 2 7 GND BIAS 3 6 IN- VCC MAX4060 EP* 4 MAX/TDFN 5 IN+ G2 1 SHDN 2 OUT 3 VCC 4 MAX4061 EP* MAX/TDFN *CONNECT EP TO GND (TDFN ONLY). www.maximintegrated.com 8 G1 7 GND 6 IN- 5 IN+ G2 1 INT/AUX 2 OUT 3 BIAS VCC 10 G1 9 AUX_IN 8 GND 4 7 IN- 5 6 IN+ MAX4062 MAX Maxim Integrated 13 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Block Diagrams 4.5V TO 5.5V 2.4V TO 5.5V 4 5 VCC 8 VCC 2.4V TO 5.5V 4 VCC MAX4060 AUX_IN x10 INT/AUX 3 BIAS 5 IN+ OUT 5 IN+ 6 IN- INT/AUX 2 4 BIAS VBIAS x10 MAX4061 2 SHDN 1 MAX4062 8 AUX_IN 2 VBIAS OUT OUT 3 6 IN+ 6 INx10 GND 3 G1 G2 8 1 GND 7 7 IN- 7 G1 G2 10 1 GND 8 Selector Guide AUXILIARY INPUT DIFF INPUT GAIN SINGLE-ENDED INPUT GAIN (dB) MAX4060 20dB MAX4061 -- ADJ MAX4062 ADJ PRODUCT* MICROPHONE BIAS SHUTDOWN MODE SUPPLY VOLTAGE (V) 20 -- 4.5 to 5.5 -- -- 2.4 to 5.5 20 -- 2.4 to 5.5 *See Block Diagrams. Chip Information PROCESS: BiCMOS www.maximintegrated.com Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. LAND PATTERN NO. 8 TDFN T833+2 21-0137 90-0059 8 MAX U8+1 21-0036 90-0092 10 MAX U10+2 21-0061 90-0330 Maxim Integrated 14 MAX4060/MAX4061/ MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown Revision History REVISION NUMBER REVISION DATE PAGES CHANGED DESCRIPTION 3 4/11 Added exposed pad information to Pin Description and Pin Configurations sections 4 11/18 Updated Package Information sections 8, 13 14 For pricing, delivery, and ordering information, please visit Maxim Integrated's online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2018 Maxim Integrated Products, Inc. 15