EVALUATION KIT AVAILABLE MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias General Description Features The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator, and AGC control circuitry. The low-noise preamplifier has a fixed 12dB gain, while the VGA gain automatically adjusts from 20dB to 0dB, depending on the output voltage and the AGC threshold. The output amplifier offers selectable gains of 8dB, 18dB, and 28dB. With no compression, the cascade of the amplifiers results in an overall gain of 40dB, 50dB, or 60dB. A trilevel digital input programs the output amplifier gain. An external resistive divider controls the AGC threshold and a single capacitor programs the attack/release times. A trilevel digital input programs the ratio of attack-to-release time. The hold time of the AGC is fixed at 30ms. The lownoise microphone-bias-voltage generator can bias most electret microphones. The MAX9814 is available in the space-saving, 14-pin TDFN package. This device is specified over the -40C to +85C extended temperature range. Applications Automatic Gain Control (AGC) Three Gain Settings (40dB, 50dB, 60dB) Programmable Attack Time Programmable Attack and Release Ratio 2.7V to 5.5V Supply Voltage Range Low Input-Referred Noise Density of 30nV/Hz Low THD: 0.04% (typ) Low-Power Shutdown Mode Internal Low-Noise Microphone Bias, 2V Available in the Space-Saving, 14-Pin TDFN (3mm x 3mm) Package -40C to +85C Extended Temperature Range Ordering Information appears at end of data sheet. Simplified Block Diagram Digital Still Cameras 2.7V TO 5.5V Digital Video Cameras PDAs Bluetooth Headsets Entertainment Systems (e.g., Karaoke) SHDN MICBIAS LOW-NOISE REFERENCE MICIN LNA +12dB VDD CIN VGA +20dB/0dB Two-Way Communicators High-Quality Portable Recorders IP Phones/Telephone Conferencing 19-0764; Rev 3; 8/16 MAX9814 AGC RMICBIAS GND GAIN +8/+18/ +28dB MICOUT COUT MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Absolute Maximum Ratings VDD to GND.............................................................-0.3V to +6V All Other Pins to GND............................... -0.3V to (VDD + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Current (MICOUT, MICBIAS).......................100mA All Other Pins....................................................................20mA Continuous Power Dissipation (TA = +70C) 14-Pin TDFN-EP (derate 16.7mW/C above +70C).........................1481.5mW Operating Temperature Range............................ -40C to +85C Junction Temperature.......................................................+150C Lead Temperature (soldering, 10s).................................. +300C Bump Temperature (soldering) Reflow............................. +235C 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 (VDD = 3.3V, SHDN = VDD, CCT = 470nF, CCG = 2F, GAIN = VDD, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = +25C.) (Note 1) PARAMETER GENERAL SYMBOL Operating Voltage VDD Supply Current IDD Shutdown Supply Current Input-Referred Noise Density Dynamic Range Total Harmonic Distortion Plus Noise Amplifier Input BIAS Maximum Input Voltage Input Impedance Maximum Gain Guaranteed by PSRR test en SNR DR THD+N AGC Attack Time Attack/Release Ratio www.maximintegrated.com A/R V 6 mA 0.01 1 A BW = 20kHz 430 VRMS BW = 22Hz to 22kHz (500mVRMS output signal) 61 A-weighted 64 (Note 2) 60 fIN = 1kHz, BW = 20Hz to 20kHz, RL = 10k, VTH = 1V (threshold = 2VP-P), VIN = 0.5mVRMS, VCT = 0V 0.04 fIN = 1kHz, BW = 20Hz to 20kHz, RL = 10k, VTH = 0.1V (threshold = 200mVP-P), VIN = 30mVRMS, VCT = 2V 0.2 dB dB % 1.14 1% THD 1.23 1.32 100 100 k 39.5 40 40.5 GAIN = GND 49.5 50 50.6 GAIN = unconnected 59.5 60 60.5 GAIN = VDD 18.7 20 20.5 30 30.8 40 40.5 29.0 38.7 1% THD+N, VTH = MICBIAS CCT = 470nF (Note 3) 0.707 1.26 V mVP-P GAIN = VDD AGC enabled, VTH = 0.7V tATTACK 5.5 3.1 nV/Hz GAIN = unconnected Regulated Output Level UNITS 30 GAIN = GND VOUT_RMS MAX 2.7 ZIN A TYP BW = 20kHz, all gain settings VIN VIN_MAX Minimum Gain Maximum Output Level MIN ISHDN Output Noise Signal-to-Noise Ratio CONDITIONS dB dB VRMS 1.40 1.54 1.1 VP-P ms A/R = GND 1:500 A/R = VDD 1:2000 A/R = unconnected 1:4000 ms/ms Maxim Integrated 2 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Electrical Characteristics (continued) (VDD = 3.3V, SHDN = VDD, CCT = 470nF, CCG = 2F, GAIN = VDD, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL MICOUT High Output Voltage VOH IOUT sourcing 1mA MICOUT Low Output Voltage VOL IOUT sinking 1mA MICOUT Bias CONDITIONS MICOUT unconnected Output Impedance MIN TYP MAX 2.45 V 3 1.14 ZOUT 1.23 UNITS mV 1.32 V 50 Minimum Resistive Load RLOAD_MIN 5 k Maximum Capacitive Drive CLOAD_MAX 200 pF Maximum Output Current IOUT_MAX Output Short-Circuit Current 1% THD, RL = 500 ISC AGC mode; VDD = 2.7V to 5.5V (Note 4) Power-Supply Rejection Ratio PSRR 1 3 8 35 50 f = 217Hz, VRIPPLE = 100mVP-P (Note 5) 2 mA 55 f = 1kHz, VRIPPLE = 100mVP-P (Note 5) 52.5 f = 10kHz, VRIPPLE = 100mVP-P (Note 5) 43 mA dB MICROPHONE BIAS Microphone Bias Voltage Output Resistance Output Noise Voltage VMICBIAS IMICBIAS = 0.5mA RMICBIAS IMICBIAS = 1mA 1.84 VMICBIAS_NOISE IMICBIAS = 0.5mA, BW = 22Hz to 22kHz Power-Supply Rejection Ratio PSRR DC, VDD = 2.7V to 5.5V 70 IMICBIAS = 0.5mA, VRIPPLE = 100mVP-P, fIN = 1kHz 2.0 2.18 V 1 5.5 VRMS 80 dB 71 TRILEVEL INPUTS (A/R, GAIN) Trilevel Input Leakage Current Input High Voltage VIH Input Low Voltage VIL A/R or GAIN = VDD 0.5VDD 0.5VDD 0.5VDD / 180k / 100k / 50k A/R or GAIN = GND 0.5VDD 0.5VDD 0.5VDD / 180k / 100k / 50k VDD x 0.7 mA V VDD x 0.3 V Shutdown Enable Time tON 60 ms Shutdown Disable Time tOFF 40 ms DIGITAL INPUT (SHDN) SHDN Input Leakage Current -1 Input High Voltage VIH Input Low Voltage VIL +1 1.3 A V 0.5 V +1 A AGC THRESHOLD INPUT (TH) TH Input Leakage Current Note Note Note Note Note 1: 2: 3: 4: 5: -1 Devices are production tested at TA = +25C. Limits over temperature are guaranteed by design. Dynamic range is calculated using the EIAJ method. The input is applied at -60dBFS (0.707VRMS), fIN = 1kHz. Attack time measured as time from AGC trigger to gain reaching 90% of its final value. CG is connected to an external DC voltage source, and adjusted until VMICOUT = 1.23V. CG connected to GND with 2.2F. www.maximintegrated.com Maxim Integrated 3 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Typical Operating Characteristics (VDD = 5V, CCT = 470nF, CCG = 2.2F, VTH = VMICBIAS x 0.4, GAIN = VDD (40dB), AGC disabled, no load, RL = 10k, COUT = 1F, TA = +25C, unless otherwise noted.) -40 50 -30 -60 GAIN = 0 GAIN = 1 -40 -50 -70 0 -80 100 10k 100k -90 -100 VRIPPLE = 200mVP-P 100 10 1k 10k VRIPPLE = 200mVP-P -110 100k 100 10 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) SUPPLY CURRENT vs. SUPPLY VOLTAGE SHUTDOWN CURRENT vs. SUPPLY VOLTAGE MICROPHONE BIAS VOLTAGE vs. MICROPHONE BIAS SOURCE CURRENT 3.2 3.1 3.0 2.9 2.8 2.7 2.5 0.4 0.3 0.2 MAX9814 toc06 3.3 0.5 2.0 VMICBIAS VOLTAGE (V) 3.4 SHUTDOWN CURRENT (nA) MAX9814 toc04 3.5 1k -80 -60 10 10 -70 MAX9814 toc05 30 PSRR (dB) -50 PSRR (dB) -20 40 MAX9814 toc03 -10 60 20 SUPPLY CURRENT (mA) -30 MAX9814 toc02 GAIN = UNCONNECTED 70 MICBIAS POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0 MAX9814 toc01 80 GAIN (dB) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY GAIN vs. FREQUENCY 1.5 1.0 0.5 0.1 2.6 2.5 3.0 3.5 4.0 4.5 5.5 0 6.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 6.0 0 5 10 15 20 25 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) IMICBIAS (mA) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE INPUT-REFERRED NOISE vs. FREQUENCY THD+N (%) 1 fIN = 300Hz, 1kHz, and 3kHz 1 0.1 0.1 fIN = 10kHz 0.01 10 100 1k FREQUENCY (Hz) www.maximintegrated.com 10k 100k 0.01 0 0.5 1.0 OUTPUT VOLTAGE (VRMS) 1.5 1000 INPUT-REFERRED NOISE (VRMS/Hz) 10 MAX9814 toc08 VOUT = 800mVRMS MAX9814 toc07 10 THD+N (%) 5.0 30 MICIN AC-COUPLED TO GND MAX9814 toc09 2.5 100 10 1 0.01 0.1 1 10 100 FREQUENCY (kHz) Maxim Integrated 4 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Typical Operating Characteristics (continued) (VDD = 5V, CCT = 470nF, CCG = 2.2F, VTH = VMICBIAS x 0.4, GAIN = VDD (40dB), AGC disabled, no load, RL = 10k, COUT = 1F, TA = +25C, unless otherwise noted.) MICBIAS NOISE vs. FREQUENCY VMICBIAS 2V/div 0V 0V VMICOUT 1V/div 0V 100 1k 10k CL = 10pF 100k 200s/div FREQUENCY (Hz) MAX9814 toc13 VTH = 1V VTH = 1V VTH = 1V VTH = 0.75V 0.25 0.75 0.50 VTH = 0.75V 0.25 VTH = 0.5V 50 100 150 0 0 10 0.50 VTH = 0.75V 0.25 VTH = 0.5V AGC ENABLED GAIN = 0 20 30 40 0 VTH = 0.5V 0 AGC ENABLED GAIN = UNCONNECTED 5 10 15 VIN (mVRMS) ATTACK TIME ATTACK TIME HOLD AND RELEASE TIME VMICOUT 500mV/div VMICOUT 500mV/div 0V 0V VMICOUT 500mV/div 0V CCT = 47nF 200s/div www.maximintegrated.com MAX9814 toc18 VIN (mVRMS) MAX9814 toc17 VIN (mVRMS) MAX9814 toc16 0 AGC ENABLED GAIN = 1 VOUT (VRMS) 0.50 VOUT vs. VIN 1.00 0.75 VOUT (VRMS) 0.75 0 VOUT vs. VIN 1.00 MAX9814 toc14 VOUT vs. VIN 1.00 20s/div MAX9814 toc15 10 VSHDN 5V/div 0V VMICOUT 500mV/div 100 MAX9814 toc12 VMICIN 10mV/div 0V 1000 10 VOUT (VRMS) TURN-ON RESPONSE MAX9814 toc11 SMALL-SIGNAL PULSE RESPONSE MAX9814 toc10 MICBIAS NOISE (nVRMS/Hz) 10,000 CCT = 47nF A/R = GND CCT = 100nF 200s/div 20ms/div Maxim Integrated 5 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Typical Operating Characteristics (continued) (VDD = 5V, CCT = 470nF, CCG = 2.2F, VTH = VMICBIAS x 0.4, GAIN = VDD (40dB), AGC disabled, no load, RL = 10k, COUT = 1F, TA = +25C, unless otherwise noted.) MAX9814 toc20 HOLD AND RELEASE TIME MAX9814 toc19 HOLD AND RELEASE TIME VMICOUT 500mV/div VMICOUT 500mV/div 0V 0V CCT = 47nF A/R = VDD 40ms/div www.maximintegrated.com CCT = 47nF A/R = UNCONNECTED 100ms/div Maxim Integrated 6 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Pin Configuration TH MICBIAS BIAS N.C. GAIN A/R MICIN TOP VIEW 14 13 12 11 10 9 8 MAX9814 5 TDFN 6 7 GND CG 4 MICOUT 3 VDD 2 N.C. 1 SHDN *EP CT + Pin Description PIN NAME FUNCTION 1 CT Timing Capacitor Connection. Connect a capacitor to CT to control the Attack and Release times of the AGC. 2 SHDN 3 CG Amplifier DC Offset Adjust. Connect a 2.2F capacitor to GND to ensure zero offset at the output. 4, 11 N.C. No Connection. Connect to GND. 5 VDD Power Supply. Bypass to GND with a 1F capacitor. 6 MICOUT TDFN 7 GND 8 MICIN 9 A/R Active-Low Shutdown Control Amplifier Output Ground Microphone Noninverting Input Trilevel Attack and Release Ratio Select. Controls the ratio of attack time to release time for the AGC circuit. A/R = GND: Attack/Release Ratio is 1:500 A/R = VDD: Attack/Release Ratio is 1:2000 A/R = Unconnected: Attack/Release Ratio is 1:4000 10 GAIN Trilevel Amplifier Gain Control. GAIN = VDD, gain set to 40dB. GAIN = GND, gain set to 50dB. GAIN = Unconnected, uncompressed gain set to 60dB. 12 BIAS Amplifier Bias. Bypass to GND with a 0.47F capacitor. 13 MICBIAS 14 TH AGC Threshold Control. TH voltage sets gain control threshold. Connect TH to MICBIAS to disable the AGC. -- EP Exposed Pad. Connect the TDFN EP to GND. www.maximintegrated.com Microphone Bias Output Maxim Integrated 7 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Detailed Description The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and a lownoise microphone bias. The MAX9814 consists of several distinct circuits: a low-noise preamplifier, a variable gain amplifier (VGA), an output amplifier, a microphone-biasvoltage generator, and AGC control circuitry. An internal microphone bias voltage generator provides a 2V bias that is suitable for most electret condenser microphones. The MAX9814 amplifies the input in three distinct stages. In the first stage, the input is buffered and amplified through the low-noise preamplifier with a gain of 12dB. The second stage consists of the VGA controlled by the AGC. The VGA/AGC combination is capable of varying the gain from 20dB to 0dB. The output amplifier is the final stage in which a fixed gain of 8dB, 18dB, 20dB is programmed through a single trilevel logic input. With no compression from the AGC, the MAX9814 is capable of providing 40dB, 50dB, or 60dB gain. Automatic Gain Control (AGC) A device without AGC experiences clipping at the output when too much gain is applied to the input. AGC prevents clipping at the output when too much gain is applied to the input, eliminating output clipping. Figure 1 shows a comparison of an over-gained microphone input with and without AGC. The MAX9814's AGC controls the gain by first detecting that the output voltage has exceeded a preset limit. The microphone amplifier gain is then reduced with a selectable time constant to correct for the excessive outputvoltage amplitude. This process is known as the attack time. When the output signal subsequently lowers in amplitude, the gain is held at the reduced state for a short period before slowly increasing to the normal value. This process is known as the hold and release time. The speed at which the amplifiers adjust to changing input signals is set by the external timing capacitor CCT and the voltage applied to A/R. The AGC threshold can be set by adjusting VTH. Gain reduction is a function of input signal amplitude with a maximum AGC attenuation of 20dB. Figure 2 shows the effect of an input burst exceeding the preset limit, output attack, hold and release times. If the attack-and-release times are configured to respond too fast, audible artifacts often described as "pumping" or "breathing" can occur as the gain is rapidly adjusted to follow the dynamics of the signal. For best results, adjust the time constant of the AGC to accommodate the source material. For applications in which music CDs are the main audio source, a 160s attack time with an 80ms release time is recommended. Music applications typically require a shorter release time than voice or movie content. MAX9814 AGC DISABLED MAX9814 AGC ENABLED MAX9814 fig01a MAX9814 fig01b 0V VMICIN 100mV/div 0V 0V VMICOUT (AC-COUPLED) 1V/div 0V 400s/div VMICIN 100mV/div VMICOUT (AC-COUPLED) 1V/div 400s/div Figure 1. Microphone Input with and Without AGC www.maximintegrated.com Maxim Integrated 8 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias attack time using CCT and setting the attack-to-release time ratio by configuring A/R, as shown in Table 1: Use a small ratio to maximize the speed of the AGC. HOLD ATTACK 0V VCT 500mV/div RELEASE Use a large ratio to maximize the sound quality and prevent repeated excursions above the threshold from being independently adjusted by the AGC. AGC Output Threshold VMICOUT (AC-COUPLED) 1V/div 0V 10ms/div Figure 2. Input Burst Exceeding AGC Limit Attack Time The attack time is the time it takes for the AGC to reduce the gain after the input signal has exceeded the threshold level. The gain attenuation during the attack time is exponential, and defined as one-time constant. The time constant of the attack is given by 2400 x CCT seconds (where CCT is the external timing capacitor): Use a short attack time for the AGC to react quickly to transient signals, such as snare drum beats (music) or gun shots (DVD). Use a longer attack time to allow the AGC to ignore short-duration peaks and only reduce the gain when a noticeable increase in loudness occurs. Short-duration peaks are not reduced, but louder passages are. This allows the louder passages to be reduced in volume, thereby maximizing output dynamic range. Hold Time Hold time is the delay after the signal falls below the threshold level before the release phase is initiated. Hold time is internally set to 30ms and nonadjustable. The hold time is cancelled by any signal exceeding the set threshold level, and the attack time is reinitiated. Release Time The release time is how long it takes for the gain to return to its normal level after the output signal has fallen below the threshold level and 30ms hold time has expired. Release time is defined as release from a 20dB gain compression to 10% of the nominal gain setting after the input signal has fallen below the TH threshold and the 30ms hold time has expired. Release time is adjustable and has a minimum of 25ms. The release time is set by picking an www.maximintegrated.com The output threshold that activates AGC is adjustable through the use of an external resistive divider. Once the divider is set, AGC reduces the gain to match the output voltage to the voltage set at the TH input. Microphone Bias The MAX9814 features an internal low-noise microphone bias voltage capable of driving most electret condenser microphones. The microphone bias is regulated at 2V to provide that the input signal to the low-noise preamplifier does not clip to ground. Applications Information Programming Attack-and-Release Times Attack-and-release times are set by selecting the capacitance value between CT and GND, and by setting the logic state of A/R (Table 1). A/R is a trilevel logic input that sets the attack-to-release time ratio. Table 1. Attack-and-Release Ratios A/R ATTACK/RELEASE RATIO GND 1:500 VDD 1:2000 Unconnected 1:4000 The attack-and-release times can be selected by utilizing the corresponding capacitances listed in Table 2. Table 2. Attack-and-Release Time CCT tATTACK (ms) 22nF tRELEASE (ms) A/R = GND A/R = VDD A/R = UNCONNECTED 0.05 25 100 200 47nF 0.11 55 220 440 68nF 0.16 80 320 640 100nF 0.24 120 480 960 220nF 0.53 265 1060 2120 470nF 1.1 550 2200 4400 680nF 1.63 815 3260 6520 1F 2.4 1200 4800 9600 Maxim Integrated 9 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Setting the AGC Threshold To set the output-voltage threshold at which the microphone output is clamped, an external resistor-divider must be connected from MICBIAS to ground with the output of the resistor-divider applied to TH. The voltage VTH determines the peak output-voltage threshold at which the output becomes clamped. The maximum signal swing at the output is then limited to two times VTH and remains at that level until the amplitude of the input signal is reduced. To disable AGC, connect TH to MICBIAS. Microphone Bias Resistor MICBIAS is capable of sourcing 20mA. Select a value for RMICBIAS that provides the desired bias current for the electret microphone. A value of 2.2k is usually sufficient for a microphone of typical sensitivity. Consult the microphone data sheet for the recommended bias resistor. Choose CIN such that f-3dB_IN is well below the lowest frequency of interest. Setting f-3dB_IN too high affects the amplifier's low-frequency response. Use capacitors with low-voltage coefficient dielectrics. Aluminum electrolytic, tantalum, or film dielectric capacitors are good choices for AC-coupling capacitors. Capacitors with high-voltage coefficients, such as ceramics (non-C0G dielectrics), can result in increased distortion at low frequencies. Output Capacitor The output of the MAX9814 is biased at 1.23V. To eliminate the DC offset, an AC-coupling capacitor (COUT) must be used. Depending on the input resistance (RL) of the following stage, COUT and RL effectively form a highpass filter. The -3dB point of the highpass filter, assuming zero output impedance, is given by: f -3dB_OUT = Bias Capacitor The BIAS output of the MAX9814 is internally buffered and provides a low-noise bias. Bypass BIAS with a 470nF capacitor to ground. Input Capacitor The input AC-coupling capacitor (CIN) and the input resistance (RIN) to the microphone amplifier form a highpass filter that removes any DC bias from an input signal (see the Typical Application Circuit/Functional Diagram). CIN prevents any DC components from the input-signal source from appearing at the amplifier outputs. The -3dB point of the highpass filter, assuming zero source impedance due to the input signal source, is given by: f -3dB_IN = www.maximintegrated.com 1 2 x R IN x C IN 1 2 x R L x C OUT Shutdown The MAX9814 features a low-power shutdown mode. When SHDN goes low, the supply current drops to 0.01A, the output enters a high-impedance state, and the bias current to the microphone is switched off. Driving SHDN high enables the amplifier. Do not leave SHDN unconnected. Power-Supply Bypassing and PCB Layout Bypass the power supply with a 0.1F capacitor to ground. Reduce stray capacitance by minimizing trace lengths and place external components as close to the device as possible. Surface-mount components are recommended. In systems where analog and digital grounds are available, connect the MAX9814 to analog ground. Maxim Integrated 10 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Typical Application Circuit/Functional Diagram VDD CBYPASS 1F SHDN VDD MICBIAS MAX9814 BIAS A/R CBIAS 0.47F R1 150k TH MICBIAS REF AGC RMICBIAS 2.21k MICIN LNA VGA CIN 0.1F VDD R2 100k GAIN MICOUT COUT ROUT CT CCT 470nF CG CCG 2.2F GND *THE DEVICE HAS BEEN CONFIGURED WITH AN ATTACK TIME OF 1.1s, 40dB GAIN, AND AN ATTACK-AND-RELEASE RATIO OF 1:500. www.maximintegrated.com Maxim Integrated 11 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Chip Information Ordering Information PART TEMP RANGE PIN-PACKAGE MAX9814ETD+T -40C to +85C 14 TDFN-EP* MAX9814ETD/V+T** -40C to +85C 14 TDFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. *EP = Exposed pad. /V denotes an automotive qualified part. **Future product--contact factory for availability. www.maximintegrated.com PROCESS: BiCMOS 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 OUTLINE NO. LAND PATTERN NO. 14 TDFN-EP T1433+2 21-0137 90-0062 Maxim Integrated 12 MAX9814 Microphone Amplifier with AGC and Low-Noise Microphone Bias Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 3/07 Initial release 1 2/09 Updated Ordering Information, Absolute Maximum Ratings, Pin Description, and Pin Configuration sections to include EP for TDFN package 2 6/09 Removed UCSP package 3 8/16 Updated and moved Ordering Information and Package Information tables DESCRIPTION -- 1, 2, 6, 11 1, 2, 6, 11, 12 1, 12 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. 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) 2016 Maxim Integrated Products, Inc. 13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX9814ETD+T