MAX9895AETL+

MAX9895AETL+ Datasheet

MAX9895A

Part	Datasheet
MAX9895AETL+	MAX9895AETL+ (pdf)

Related Parts	Information
MAX9895AETL+T	MAX9895AETL+T

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MAX9895A Active Noise-Cancelling Solution for Stereo Headsets The MAX9895A is a complete audio subsystem for active noise-cancelling ANC stereo headsets. The device features three stages for each right and left channel. A microphone preamplifier, an analog sound processing block, and a headphone amplifier combine to create a simple and very flexible active noise-canceling system. The MAX9895A features a feed-forward architecture, where outside microphones sense the ambient noise and on-board analog sound processing generates the compensation signal needed for noise reduction. This further supports the mechanical isolation of the headset by attenuating sound that leaks through the mechanics of the headphone. The microphone preamplifiers feature programmable gain, allowing alignment of the microphone and driver tolerances and left-right channel matching. The headphone amplifiers are output capacitorless and can deliver 33mW into a transducer. The MAX9895A has three modes of operation ANC on, PTL, and ANC off. The ANC-on mode demonstrates the noise-canceling performance of the device. PTL pushto-listen mode sends the microphone signals directly to the headphones to temporarily listen to the surroundings. ANC off disables noise-canceling, but allows use of the headphone amplifiers during music playback. The MAX9895A is available in a space-saving WLP or TQFN package and is specified over the -40°C to +85°C extended temperature range. Noise-Cancelling Headphones/Headsets Headsets for Mobile Communication Mobile Phones Portable Gaming Devices E-Books o 2.7V to 4.5V Operation o Low Headphone Amplifier Noise o Low-Noise Microphone Preamplifiers with 2.2V Bias o Stereo 33mW into Capacitorless Headphone Amplifiers o Microphone Output Path Available for Speech Transmission o Adjustable Microphone Gain by I2C Interface or External Resistors o Low External Component Count Ordering Information PART TEMP RANGE PINPACKAGE MAX9895AEWX+ -40°C to +85°C 36 WLP MAX9895AETL+ -40°C to +85°C 40 TQFN-EP* +Denotes a lead Pb -free/RoHS-compliant package. *EP = Exposed pad. GAIN V/V Simplified Block Diagram MICROPHONE INPUT LEFT MICROPHONE INPUT RIGHT MIC PREAMP MIC PREAMP MAX9895A ANALOG SIGNAL PROCESSING HEADPHONE LEFT HEADPHONE AMP LINE IN LEFT HEADPHONE RIGHT ANALOG SIGNAL PROCESSING HEADPHONE AMP LINE IN RIGHT Pin Configurations appear at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at MAX9895A Active Noise-Cancelling Solution for Stereo Headsets ABSOLUTE MAXIMUM RATINGS VDD to GND to +6V PVDD to +6V PVDD to VDD to +0.1V CPVDD to PVDD shorted PGND to GND to +0.1V SDA, to +6V LINEIN_ to +6V Any Other Pin to VDD + 0.3V Duration of Short Circuit Between HPOUT_ and GND Duration of Short Circuit Between MICBIAS and VDD, GND Duration of Short Circuit Between VMID and VDD, GND Continuous Current into HPOUT_ Continuous Input Current all other pins .........................±20mA Continuous Power Dissipation TA = +70°C 36-Bump, 0.4mm-Pitch WLP Single-Layer Board derate 17mW/°C above +70°C ..............................1360mW Maximum Current per Bump 10k hrs at +120°C ................1.7A TQFN Package derate 22mW/°C above +70°C ......1777mW ESD Protection, Human Body Model ...................................±2kV Operating Temperature Range ...........................-40°C to +85°C Junction Temperature Storage Temperature Range .............................-65°C to +150°C 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 = VPVDD = VCPVDD = 3.3V, RL = ∞, CVDD = 10µF connected between VDD and PGND, CBIAS = 1µF connected between VBIAS and GND, CFLY = 1µF connected between C1P and C1N. CHOLD = 1µF connected between VMID and PGND, RPREIN_ = RPREFB_ = RMICBIAS = MIC signal gain in ANC mode ANC_GAIN = -11.5dB, MIC signal gain in PTL mode PTL_GAIN = -5.5dB, VGAIN = +1V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. Note1 PARAMETER GENERAL Supply Voltage Range Quiescent Supply Current Shutdown Supply Current Internal Reference Startup Time Undervoltage Lockout HEADPHONE OUTPUTS Line Input Resistance Output Offset Voltage Total Harmonic Distortion plus Noise Power-Supply Rejection Ratio Note 2 CONDITIONS VDD PVDD CPVDD ISHDN VBIAS tON UVLO Inferred by PSRR test ANC = on ANC = off, PTL = off PTL = on I2C mode, TA = +25°C Voltage on VBIAS Input from LINEIN_ Input from MICIN_ Falling threshold RIN VOS THD+N PSRR MAX9895A TA = +25°C RL = POUT = 10mW, f = 1kHz from LINEIN_ RL = POUT = 10mW, f = 1kHz from LINEIN_ VDD = 2.5V to 4.5V, TA = +25°C f 1kHz, VIN = 200mVP-P f = 10kHz, VIN = 200mVP-P MIN TYP MAX UNITS 37 ms MAX9895A Active Noise-Cancelling Solution for Stereo Headsets ELECTRICAL CHARACTERISTICS continued VDD = VPVDD = VCPVDD = 3.3V, RL = ∞, CVDD = 10µF connected between VDD and PGND, CBIAS = 1µF connected between VBIAS and GND, CFLY = 1µF connected between C1P and C1N. CHOLD = 1µF connected between VMID and PGND, RPREIN_ = RPREFB_ = RMICBIAS = MIC signal gain in ANC mode ANC_GAIN = -11.5dB, MIC signal gain in PTL mode PTL_GAIN = -5.5dB, VGAIN = +1V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. Note1 PARAMETER

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MAX9895A

Active Noise-Cancelling Solution for Stereo Headsets

The MAX9895A is a complete audio subsystem for active noise-cancelling ANC stereo headsets. The device features three stages for each right and left channel. A microphone preamplifier, an analog sound processing block, and a headphone amplifier combine to create a simple and very flexible active noise-canceling system.

The MAX9895A features a feed-forward architecture, where outside microphones sense the ambient noise and on-board analog sound processing generates the compensation signal needed for noise reduction. This further supports the mechanical isolation of the headset by attenuating sound that leaks through the mechanics of the headphone.

The microphone preamplifiers feature programmable gain, allowing alignment of the microphone and driver tolerances and left-right channel matching. The headphone amplifiers are output capacitorless and can deliver 33mW into a transducer.

The MAX9895A has three modes of operation ANC on, PTL, and ANC off. The ANC-on mode demonstrates the noise-canceling performance of the device. PTL pushto-listen mode sends the microphone signals directly to the headphones to temporarily listen to the surroundings. ANC off disables noise-canceling, but allows use of the headphone amplifiers during music playback.

The MAX9895A is available in a space-saving WLP or TQFN package and is specified over the -40°C to +85°C extended temperature range.

Noise-Cancelling Headphones/Headsets

Headsets for Mobile Communication

Mobile Phones

Portable Gaming Devices

E-Books
o 2.7V to 4.5V Operation
o Low Headphone Amplifier Noise
o Low-Noise Microphone Preamplifiers with 2.2V Bias
o Stereo 33mW into Capacitorless Headphone Amplifiers
o Microphone Output Path Available for Speech Transmission
o Adjustable Microphone Gain by I2C Interface or External Resistors
o Low External Component Count
Ordering Information

PART

TEMP RANGE

PINPACKAGE

MAX9895AEWX+ -40°C to +85°C 36 WLP MAX9895AETL+ -40°C to +85°C 40 TQFN-EP*
+Denotes a lead Pb -free/RoHS-compliant package. *EP = Exposed pad.

GAIN V/V

Simplified Block Diagram

MICROPHONE INPUT LEFT

MICROPHONE INPUT RIGHT

MIC PREAMP

MIC PREAMP

MAX9895A

ANALOG SIGNAL PROCESSING

HEADPHONE LEFT

HEADPHONE

AMP LINE

IN LEFT

HEADPHONE RIGHT

ANALOG SIGNAL PROCESSING

HEADPHONE AMP

LINE IN RIGHT

Pin Configurations appear at end of data sheet.

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at

MAX9895A

Active Noise-Cancelling Solution for Stereo Headsets

ABSOLUTE MAXIMUM RATINGS

VDD to GND to +6V PVDD to +6V PVDD to VDD to +0.1V CPVDD to PVDD shorted

PGND to GND to +0.1V

SDA, to +6V

LINEIN_ to +6V Any Other Pin to VDD + 0.3V Duration of Short Circuit Between HPOUT_
and GND

Duration of Short Circuit Between MICBIAS and VDD, GND

Duration of Short Circuit Between VMID and VDD, GND

Continuous Current into HPOUT_ Continuous Input Current all other pins .........................±20mA Continuous Power Dissipation TA = +70°C
36-Bump, 0.4mm-Pitch WLP Single-Layer Board derate 17mW/°C above +70°C ..............................1360mW

Maximum Current per Bump 10k hrs at +120°C ................1.7A TQFN Package derate 22mW/°C above +70°C ......1777mW

ESD Protection, Human Body Model ...................................±2kV Operating Temperature Range ...........................-40°C to +85°C Junction Temperature Storage Temperature Range .............................-65°C to +150°C

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 = VPVDD = VCPVDD = 3.3V, RL = ∞, CVDD = 10µF connected between VDD and PGND, CBIAS = 1µF connected between VBIAS and GND, CFLY = 1µF connected between C1P and C1N. CHOLD = 1µF connected between VMID and PGND, RPREIN_ = RPREFB_ = RMICBIAS = MIC signal gain in ANC mode ANC_GAIN = -11.5dB, MIC signal gain in PTL mode PTL_GAIN = -5.5dB, VGAIN = +1V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. Note1

PARAMETER GENERAL

Supply Voltage Range

Quiescent Supply Current

Shutdown Supply Current Internal Reference Startup Time Undervoltage Lockout HEADPHONE OUTPUTS Line Input Resistance Output Offset Voltage

Total Harmonic Distortion plus Noise

Power-Supply Rejection Ratio Note 2

CONDITIONS

VDD PVDD CPVDD

ISHDN VBIAS tON UVLO

Inferred by PSRR test

ANC = on ANC = off, PTL = off PTL = on I2C mode, TA = +25°C Voltage on VBIAS Input from LINEIN_ Input from MICIN_ Falling threshold

RIN VOS THD+N

PSRR

MAX9895A TA = +25°C RL = POUT = 10mW, f = 1kHz from LINEIN_

RL = POUT = 10mW, f = 1kHz from LINEIN_

VDD = 2.5V to 4.5V, TA = +25°C f 1kHz, VIN = 200mVP-P f = 10kHz, VIN = 200mVP-P

MIN TYP MAX UNITS
37 ms

MAX9895A

Active Noise-Cancelling Solution for Stereo Headsets

ELECTRICAL CHARACTERISTICS continued

VDD = VPVDD = VCPVDD = 3.3V, RL = ∞, CVDD = 10µF connected between VDD and PGND, CBIAS = 1µF connected between VBIAS and GND, CFLY = 1µF connected between C1P and C1N. CHOLD = 1µF connected between VMID and PGND, RPREIN_ = RPREFB_ = RMICBIAS = MIC signal gain in ANC mode ANC_GAIN = -11.5dB, MIC signal gain in PTL mode PTL_GAIN = -5.5dB, VGAIN = +1V/V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. Note1

PARAMETER

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Datasheet ID: MAX9895AETL+ 647442