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19-2408; Rev 2; 5/05
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 common-mode 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 singleended 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 thin QFN (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 Thin QFN (MAX4060/MAX4061) 8-Pin MAX (MAX4060/MAX4061) 10-Pin MAX (MAX4062)
MAX4060/MAX4061/MAX4062
Typical Operating Circuit
2.4V TO 5.5V BIAS 4 VCC
Applications
Notebook Audio Systems Tablet PCs PDA Audio Systems USB Audio Peripherals AES-42-Compliant Microphones Signal Conditioning
MAX4060
8 AUX_IN x10 INT/AUX 1
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 PINPACKAGE 8 Thin QFN-EP* 8 MAX 8 Thin QFN-EP* 8 MAX 10 MAX TOP MARK ABY -- ABZ -- --
BIAS OUT 2 5 IN+ x10 6 INVBIAS GND BIAS 3 BIAS
*EP = Exposed paddle. Pin Configurations and Selector Guide appear at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
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 Thin QFN (derate 4.7mW/C above +70C) ......379mW 8-Pin MAX (derate 4.1mW/C above +70C) ............330mW 10-Pin MAX (derate 5.6mW/C above +70C) .........444mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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
(V CC = 3V for MAX4061/MAX4062, V CC = 5V for MAX4060, GND = 0V, SHDN = V CC , INT/AUX = 0V, R G = 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 Supply Voltage Range Supply Current Output Common-Mode Voltage Slew Rate Supply Current in Shutdown Output Short-Circuit Current SYMBOL VCC ICC VOCM SR I SHDN ISC AV = 10V/V V SHDN = 0V, MAX4061 To GND To VCC 1.25 Inferred from PSRR test CONDITIONS MAX4061/MAX4062 MAX4060 MIN 2.4 4.5 0.75 1.5 1 0.001 30 30 0.1 1 AV = 1V/V, MAX4061/MAX4062 1 600 Either differential input AV = 10V/V, f = 1kHz Input Noise-Voltage Density RMS Output Noise Voltage en VNRMS AV = 100V/V, f = 1kHz, MAX4061/MAX4062 only AV = 10V/V, BW = 22Hz to 22kHz 100 1 100 nV/Hz 20 125 VRMS 5 2 1 TYP MAX 5.5 5.5 1.2 1.75 UNITS V mA V V/s A mA
DIFFERENTIAL INPUT (INT/AUX = 0V for MAX4060/MAX4062, default for MAX4061) Input Offset Voltage Common-Mode Input Voltage Range Maximum Differential Input Voltage Small-Signal Bandwidth Input Resistance Input Resistance Match VOS VCM VDIFFMAX BW-3dB RIN RMATCH mV V V kHz k %
2
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 3V for MAX4061/MAX4062, V CC = 5V for MAX4060, GND = 0V, SHDN = V CC , INT/AUX = 0V, R G = 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 Total Harmonic Distortion Plus Noise SYMBOL THD+N CONDITIONS AV = 10V/V, f = 1kHz, VOUT = 0.7VRMS, BW = 22Hz to 22kHz 1V < VCM < 2V, VOUT = 0.7VRMS, MAX4061/MAX4062 RG = open RG = 11.11k RG = 1.01k 1 9.6 96 9.6 72 60 86 200 100 f = 1kHz BW = 22Hz to 22kHz f = 1kHz, BW = 22Hz to 22kHz TA = +25C TA = TMIN - TMAX VOUT = 0.7VRMS IBIAS = 0.8mA to GND, MAX4060 IBIAS = 0.5mA to GND, MAX4062 IBIAS = 0.8mA to GND, MAX4060 (TA = +25C) IBIAS = 0.5mA to GND, MAX4062 (TA = +25C) IBIAS = 0.8mA to GND, BW = 22Hz to 22kHz, MAX4060 Output Noise Voltage VNRMS IBIAS = 0.5mA to GND, BW = 22Hz to 22kHz, MAX4062 65 50 -10.7 2 2 2 -10 2.2 2.2 2.5 22 50 VRMS 20 40 -9.3 45 385 0.05 90 kHz k nV/Hz VRMS % dB V/V MIN TYP 0.04 1.13 10 100 10.0 70 89 dB 1.3 10.4 104 10.4 dB V/V MAX UNITS %
MAX4060/MAX4061/MAX4062
Differential Gain
AVDIFF
1V < VCM < 2V, VOUT = 0.7VRMS, MAX4060 Common-Mode Rejection Ratio Power-Supply Rejection Ratio CMRR PSRR VCM = 500mVP-P, f = 1kHz TA = +25C TA = TMIN to TMAX VCC = 5V 100mV, f = 1kHz AUXILIARY INPUT (MAX4060/MAX4062, INT/AUX = VCC) Small-Signal Bandwidth Input Resistance Input Noise-Voltage Density RMS Output Noise Voltage Total Harmonic Distortion Plus Noise Power-Supply Rejection Ratio Voltage Gain BIAS OUTPUT (MAX4060/MAX4062) Output Voltage VOUT BW-3dB RIN en VNRMS THD+N PSRR AVAUX
V k
Output Resistance
ROUT
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 3V for MAX4061/MAX4062, V CC = 5V for MAX4060, GND = 0V, SHDN = V CC , INT/AUX = 0V, R G = 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 IBIAS = 0.8mA to GND, VCC = 4.5V to 5.5V IBIAS = 0.8mA, VCC = 5V + 100mVP-P, f = 1kHz IBIAS = 0.5mA to GND, VCC = 2.4V to 5.5V IBIAS = 0.5mA, VCC = 3V + 100mVP-P, f = 1kHz DIGITAL INPUTS (SHDN for MAX4061 and INT/AUX for MAX4060/MAX4062) Input Leakage Current Input-Voltage High Input-Voltage Low Shutdown Enable Time Shutdown Disable Time IIN VINH VINL tON tOFF MAX4061 MAX4061 10 10 VIN = 0V or VCC 0.7 x VCC 0.3 x VCC 1 A V V s s 50 MIN 50 TYP 80 70 dB 74 71 MAX UNITS
MAX4060 Power-Supply Rejection Ratio PSRR MAX4062
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.
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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.)
GAIN vs. FREQUENCY (NO LOAD)
MAX4060 toc01
MAX4060/MAX4061/MAX4062
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (DIFF INPUT)
MAX4060 toc02
SUPPLY CURRENT vs. TEMPERATURE
MAX4060 toc03
3 0
VCC = 5V
0 -20 -40 PSRR (dB)
1.0
0.8 SUPPLY CURRENT (mA)
VCC = 5V VCC = 3V
GAIN (dB)
-3 -6 -9 -12 -15 10 100 1k 10k 100k 1M FREQUENCY (Hz)
0.6
-60 -80 -100 -120 10
AV = 10V/V
0.4
0.2 AV = 100V/V 0 100 1k 10k 100k 1M -40 -25 -10 5 20 35 50 65 80 FREQUENCY (Hz) TEMPERATURE (C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4060 toc04
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX4060 toc05
OUTPUT-VOLTAGE HIGH vs. TEMPERATURE
VOH = VCC - VOUT
MAX4060 toc06
0.9 0.8 SUPPLY CURRENT (mA) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 AV = 10V/V NO LOAD
100 SHUTDOWN SUPPLY CURRENT (nA)
1000
10
ILOAD = 2.5mA 100 VOH (mV) 10 0.01 ILOAD = 50A 0.001 1 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C) 1
0.1
5.5
SUPPLY VOLTAGE (V)
OUTPUT-VOLTAGE LOW vs. TEMPERATURE
MAX4060 toc07
OUTPUT-VOLTAGE HIGH vs. LOAD CURRENT
VOH = VCC - VOUT 150 125 VOH (mV) 100 75 50 VCC = 3V VOL (mV)
MAX4060 toc08
OUTPUT-VOLTAGE LOW vs. LOAD CURRENT
MAX4060 toc09
1000
175
300 250 200 VCC = 3V 150 100 50 0
ILOAD = 2.5mA 100 VOL (mV) 10
ILOAD = 50A 1 -40 -15 10 35 60 85 TEMPERATURE (C)
25 0 0 1 2 3 4 5 LOAD CURRENT (mA)
0
1
2
3
4
5
LOAD CURRENT (mA)
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
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.)
MAX4060 MIC BIAS VOLTAGE vs. TEMPERATURE
MAX4060 toc10
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (DIFF INPUT)
MAX4060 toc11
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (AUX INPUT)
VOUT = 2.26VP-P
MAX4060 toc12
2.300 IBIAS = 800A 2.275 MIC BIAS VOLTAGE (V) 2.250
1
VOUT = 2.26VP-P
1
THD+N (%)
2.200 2.175 2.150 2.125 2.100 -40 -15 10 35 60 85 TEMPERATURE (C)
THD+N (%)
2.225
0.1
VCC = 3V
0.1
VCC = 3V
VCC = 5V 0.01
VCC = 5V 0.01
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 10 100 1k FREQUENCY (Hz) 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (DIFF INPUT, VCC = 3V)
MAX4060 toc13
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (DIFF INPUT, VCC = 5V)
MAX4060 toc14
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (AUX INPUT, VCC = 3V)
BW = 22kHz
MAX4060 toc15
10 BW = 22kHz 1
10 BW = 22kHz 1 THD+N (%) f = 1kHz
10
1 THD+N (%)
THD+N (%)
f = 1kHz 0.1 f = 10kHz 0.01
0.1
0.1
f = 1kHz f = 10kHz
0.01
f = 10kHz
0.01
0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (VP-P)
0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT VOLTAGE (VP-P)
0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (VP-P)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (AUX INPUT, VCC = 5V)
BW = 22kHz 1 THD+N (%) (nV/Hz)
MAX4060 toc16
INPUT-REFERRED NOISE vs. FREQUENCY (DIFF INPUT)
MAX4060 toc17
MAX4060 MIC BIAS OUTPUT NOISE
MAX4060 toc18
10
800 700 600 500 400 300
VCC = 5V BW = 22Hz TO 22kHz
0.1
f = 1kHz
5V/div
0.01
f = 10kHz
200 100
0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT VOLTAGE (VP-P)
0 10 100 1k FREQUENCY (Hz) 10k 100k 100ms/div
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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.)
MAX4062 MIC BIAS OUTPUT NOISE
MAX4060 toc19
MAX4060/MAX4061/MAX4062
SMALL-SIGNAL TRANSIENT RESPONSE FOR DIFF INPUT
MAX4060 toc20
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
MAX4060 toc21
LARGE-SIGNAL TRANSIENT RESPONSE FOR DIFF INPUT
MAX4060 toc22
INPUT 5mV/div
INPUT 100mV/div
OUTPUT 1V/div OUTPUT 50mV/div
10s/div
10s/div
LARGE-SIGNAL TRANSIENT RESPONSE FOR AUX INPUT
MAX4060 toc23
OUTPUT OVERDRIVEN
MAX4060 toc24
INPUT 200mV/div
DIFFERENTIAL INPUT
INPUT 500mV/div
OUTPUT 1V/div
OUTPUT 1V/div
10s/div
10s/div
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
Pin Description
PIN NAME MAX4060 1 2 3 4 5 6 7 8 MAX4061 -- 3 -- 4 5 6 7 -- MAX4062 2 3 -- 5 6 7 8 9 INT/AUX OUT BIAS VCC IN+ INGND AUX_IN Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select internal or high to select auxiliary microphone input. Amplifier Output. OUT is high impedance when in shutdown mode. External Electret Microphone Capsule Bias Output. BIAS has a greater than 2k output impedance. Power Supply. Bypass the VCC to GND with a 0.1F capacitor. 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.) Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown mode. External Electret Microphone Capsule Bias Output Bypass BIAS with 1F Capacitor to Ground Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. FUNCTION
--
1
1
G2
-- -- --
2 -- 8
-- 4 10
SHDN BIAS G1
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/MAX4061 have an internal bias generator to bias the microphone in either differential or singleended modes. The MAX4061 includes a complete
0.3A shutdown 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 single-ended 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.
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown
Functional Diagram
2.4V TO 5.5V BIAS 4 VCC
MAX4060/MAX4061/MAX4062
MAX4060
8 AUX_IN x10 INT/AUX 1
BIAS OUT 2 5 IN+ x10 6 INVBIAS GND 7 BIAS 3 BIAS
Fixed Differential Gain (MAX4060) 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. 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.
Input Capacitors The two differential microphone inputs and the singleended 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: 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 differ9
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
2.4V TO 5.5V
5 100k VCC RBIAS 4 BIAS CBIAS VBIAS
MAX4062
9 AUX_IN x10 INT/AUX 2
6 IN+
OUT 3
7 IN-
G1 10
G2 1 GND 8
Figure 1. MAX4062 with Auxiliary Input Configuration
ential 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. 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.
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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).
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
4.5V TO 5.5V 4 VCC MICROPHONE INPUT
MAX4060
8 AUX_IN x10 INT/AUX 3 BIAS RBIAS OUT 5 IN+ x10 6 INGND 7 2 VBIAS 1
Figure 2. MAX4060 Used for Biasing a Microphone
MAX4061/MAX4062 The MAX4061/MAX4062 have 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 hand-held 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.
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 floating.
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.
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.
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
2.4V TO 5.5V 5 VCC 4 BIAS 0.1F VBIAS
MAX4062
9 AUX_IN 0.1F 2.2k RG 11k 2.2k 0.1F 1 G2 6 IN+
x10 INT/AUX 2
10 G1
OUT 3
7 IN0.1F GND 8
Figure 3. MAX4062 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
2.4V TO 5.5V 5 VCC 4 BIAS 0.1F 9 AUX_IN 2.2k 0.1F x10 INT/AUX 2 VDD 1k RG 11k 1 G2 2.2F 1k 0.1F 6 IN+ 10 G1 VBIAS
MAX4062
OUT 3
7 IN1k 0.1F GND 2.2F 1k 8
Figure 4. Remote Differential Microphone Bias Network Optimizes Noise Rejection in Long-Run, PC Board Traces
Pin Configurations
TOP VIEW
INT/AUX OUT BIAS VCC 1 2 3 4 8 AUX_IN GND ININ+ G2 SHDN OUT VCC 1 2 3 4 8 G1 GND ININ+ INT/AUX OUT BIAS VCC 2 3 4 5 9 AUX_IN GND ININ+ G2 1 10 G1
MAX4060
7 6 5
MAX4061
7 6 5
MAX4062
8 7 6
MAX/THIN QFN
MAX/THIN QFN
MAX
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13
Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
Block Diagrams
4.5V TO 5.5V 4 VCC 2.4V TO 5.5V 5
2.4V TO 5.5V
VCC
MAX4060
8 AUX_IN x10 INT/AUX 3 BIAS VBIAS 1
4 VCC
MAX4062
8 AUX_IN x10
2 SHDN
MAX4061
4 BIAS
INT/AUX 2
VBIAS OUT 3
5 IN+
OUT 5 IN+ x10 6 INGND 7 2
OUT 3 6 INGND 7
6 IN+
G1 8
G2 1
7 IN-
G1 10
G2 1
GND 8
Selector Guide
PRODUCT* MAX4060 MAX4061 MAX4062 AUXILIARY INPUT -- DIFF INPUT GAIN 20dB ADJ ADJ SINGLE-ENDED INPUT GAIN (dB) 20 -- 20 MICROPHONE BIAS -- SHUTDOWN MODE -- -- SUPPLY VOLTAGE (V) 4.5 to 5.5 2.4 to 5.5 2.4 to 5.5
*See Block Diagrams.
Chip Information
TRANSISTOR COUNT: 264 PROCESS: BiCMOS
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Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
6, 8, &10L, DFN THIN.EPS
MAX4060/MAX4061/MAX4062
D2 D A2
N
PIN 1 ID
0.35x0.35 b
PIN 1 INDEX AREA
E DETAIL A
E2 e
[(N/2)-1] x e REF.
A1
k
C L
C L
A
L e e
L
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
G
1 2
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 MAX. 0.80 3.10 3.10 0.05
0.20 0.40 0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T633-2 T833-1 T833-2 T833-3 T1033-1 T1433-1 T1433-2 N 6 6 8 8 8 10 14 14 D2 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.700.10 1.700.10 E2 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 e 0.95 BSC 0.95 BSC 0.65 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEEC MO229 / WEED-3 ------b 0.400.05 0.400.05 0.300.05 0.300.05 0.300.05 0.250.05 0.200.05 0.200.05 [(N/2)-1] x e 1.90 REF 1.90 REF 1.95 REF 1.95 REF 1.95 REF 2.00 REF 2.40 REF 2.40 REF
DOWNBONDS ALLOWED
NO NO NO NO YES NO YES NO
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
G
2 2
______________________________________________________________________________________
15
Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
4X S
8
8
INCHES DIM A A1 A2 b MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
O0.500.1
E
H
0.60.1
c D e E H L
1
1
0.60.1
S
D
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
c e b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
1 1
J
16
______________________________________________________________________________________
8LUMAXD.EPS
Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX4060/MAX4061/MAX4062
e
10
4X S
10
INCHES MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 D1 0.116 0.120 0.114 0.118 D2 0.116 E1 0.120 E2 0.114 0.118 H 0.187 0.199 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S 0 6
MILLIMETERS MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.500 BSC 0.090 0.200 0.498 REF 0 6
H
O0.500.1
0.60.1
1
1
0.60.1
TOP VIEW
BOTTOM VIEW
D2 GAGE PLANE A2 A b A1 D1
E2
c
E1 L1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0061
1 1
I
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
10LUMAX.EPS

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