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FAN3850A Microphone Pre-Amplifier with Digital Output Features Description Optimized for Mobile Handset and Notebook PC Microphone Applications Accepts Input from Electret Condenser Microphones (ECM) Pulse Density Modulation (PDM) Output The FAN3850A integrates a pre-amplifier, LDO, and ADC that converts Electret Condenser Microphone (ECM) outputs to digital Pulse Density Modulation (PDM) data streams. The pre-amplifier accepts analog signals from the ECM and drives an over-sampled sigma delta Analog-to-Digital Converter (ADC) and outputs PDM data. The PDM digital audio has the advantage of noise rejection and easy interface to mobile handset processors. Low-Power 1.5 A Sleep Mode Standard 5-Wire Digital Interface 16dB Gain The FAN3850A features an integrated LDO and is powered from the system supply rails up to 3.63 V, with low power consumption of only 0.85 mW and less than 20 W in Power-Down Mode. Low Input Capacitance, High PSR, 20 kHz Pre-Amplifier Typical 470 A Supply Current SNR of 62 dB(A) for 16 dB Gain Respectively Total Harmonic Distortion 0.02% Input Clock Frequency Range of 1-4 MHz Integrated Low Drop-Out Regulator (LDO) Small 1.26 mm x 0.86 mm 6-Ball WLCSP Package Applications Electret Condenser Microphones with Digital Output Mobile Handset Headset Accessories Personal Computer (PC) . Ordering Information Part Number FAN3850AUC16X Operating Temperature Range Package Packing Method -30C to +85C 6 Ball, Wafer-Level Chip-Scale Package (WLCSP) 3000 Units on Tape & Reel (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com FAN3850A -- Microphone Pre-Amplifier with Digital Output August 2016 VDD Sleep Mode Ctrl LDO INPUT Pre-Amp CLOCK ADC DATA SELECT GND Figure 1. Block Diagram FAN3850A -- Microphone Pre-Amplifier with Digital Output Block Diagram Pin Configuration CLOCK A1 A2 SELECT GND B1 B2 INPUT DATA C1 C2 VDD TOP VIEW Figure 2. Pin Assignments Pin Definitions Pin# Name Type A1 CLOCK Input Clock Input B1 GND Input Ground Pin C1 DATA Output A2 SELECT Input Rising or Falling Clock Edge Select B2 INPUT Input Microphone Input C2 VDD Input Device Power Pin (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 Description PDM Output - 1 Bit ADC www.fairchildsemi.com 2 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VDD VIO ESD Parameter Min. Max. Unit V DC Supply Voltage -0.3 4.0 Digital I/O -0.3 VDD+0.3 Microphone Input -0.3 2.2 Human Body Model, JESD22-A114, All Pins Except Microphone Input Human Body Model, JESD22-A114 - Microphone Input V 7 kV 300 V Note: 1. This device is fabricated using CMOS technology and is therefore susceptible to damage from electrostatic discharges. Appropriate precautions must be taken during handling and storage of this device to prevent exposure to ESD. Reliability Information Symbol TJ Parameter Typ. Junction Temperature TSTG Storage Temperature Range TRFLW Peak Reflow Temperature JA Min. -65 Thermal Resistance, JEDEC Standard, Multilayer Test Boards, Still Air Max. Unit +150 C +125 C +260 C 90 FAN3850A -- Microphone Pre-Amplifier with Digital Output Absolute Maximum Ratings C/W Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Min. TA Operating Temperature Range -30 VDD Supply Voltage Range 1.64 tRF-CLK Clock Rise and Fall Time (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 Typ. 1.80 Max. Unit +85 C 3.63 V 10 ns www.fairchildsemi.com 3 Unless otherwise specified, all limits are guaranteed for TA=25C, VDD=1.8 V, VIN=94 dB (SPL), and fCLK=2.4 MHz. Duty Cycle=50% and CMIC=15 pF. Symbol SNR eN VIN FAN3850AUC16X Parameter Min. Typ. Signal-to-Noise Ratio fIN=1kHz (1Pa), A-Weighted (3) Total Input RMS Noise 20Hz to 20kHz, A-Weighted Maximum Input Signal fIN=1kHz, THD+N < 10%, Level=0V Unit Max. 62 dB(A) 5.74 6.80 VRMS 448 mVPP Electrical Characteristics Unless otherwise specified, all limits are guaranteed for TA=25C, VDD=1.8 V, VIN=94 dB (SPL), and fCLK=2.4 MHz. Duty Cycle=50% and CMIC=15 pF. Symbol Parameter Condition Min. Typ. Max. Unit 1.64 1.80 3.63 V VDD Supply Voltage Range IDD Supply Current INPUT=AC Coupled to GND, CLOCK=On, No Load 470 Sleep Mode Current fCLK=GND 1.5 PSR Power Supply Rejection INPUT=AC Coupled to GND, Test Signal on VDD=217 Hz Square Wave and (2) Broadband Noise , Both 100mVP-P -74 dBFS INNOM Nominal Sensitivity INPUT=94 dBSPL (1Pa) -26 dBFS fIN=1 kHz, INPUT=-26 dBFS 0.02 0.20 50Hz fIN 1 kHz, INPUT=-20 dBFS 0.2 1.0 fIN=1 kHz, INPUT=-5 dBFS 1.0 5.0 fIN=1kHz, INPUT=0 dBFS 5.0 10.0 INPUT 0.2 ISLEEP THD THD+N CIN (3) (4) Total Harmonic Distortion (6) (3) THD and Noise (7) Input Capacitance (7) RIN Input Resistance VIL CLOCK & SELECT Input Logic LOW Level INPUT VIH CLOCK & SELECT Input Logic HIGH Level VOL Data Output Logic LOW Level VOH Data Output Logic HIGH Level VOUT Acoustic Overload Point (7) A A 8.0 % % pF G >100 1.5 THD < 10% FAN3850A -- Microphone Pre-Amplifier with Digital Output Device Specific Electrical Characteristics 0.3 V VDD+0.3 V 0.35*VDD V 0.65*VDD V 120 dBSPL Continued on the following page... (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com 4 Unless otherwise specified, all limits are guaranteed for TA=25C, VDD=1.8 V, VIN=94 dB(SPL), and fCLK=2.4 MHz. Duty Cycle=50% and CMIC=15 pF. Symbol Parameter Condition Min. Typ. Max. Unit tA Time from CLOCK Transition to Data becoming Valid On Falling Edge of CLOCK, SELECT=GND, CLOAD=15 pF 18 43 tB Time from CLOCK Transition to Data becoming HIGH-Z On Rising Edge of CLOCK, SELECT=GND, CLOAD=15 pF 0 5 tA Time from CLOCK Transition to Data becoming Valid On Rising Edge of CLOCK, SELECT=VDD, CLOAD=15 pF 18 56 tB Time from CLOCK Transition to Data becoming HIGH-Z On Falling Edge of CLOCK, SELECT=VDD, CLOAD=15 pF 0 5 16 ns 1.0 2.4 4.0 MHz 40 50 60 % 0.35 2.00 ms 0.01 1.00 ms 100 pF fCLK CLKdc tWAKEUP tFALLASLEEP CLOAD Input CLOCK Frequency CLOCK Duty Cycle Wake-Up Time (8) Active Mode (3) (9) fCLK=2.4MHz (10) Fall-Asleep Time fCLK=2.4MHz 0 Load Capacitance on Data Notes: 2. Pseudo-random noise with triangular probability density function. Bandwidth up to 10 MHz. 3. Guaranteed by characterization. 4. Assuming that 120 dB(SPL) is mapped to 0 dBFS. 5. Assuming an input of -45 dBV. 6. Guaranteed by design. 7. All parameters are tested at 2.4 MHz. Frequency range guaranteed by characterization. 8. Device wakes up when fCLK 300 kHz. 9. Device falls asleep when fCLK 70 kHz. ns 16 ns ns FAN3850A -- Microphone Pre-Amplifier with Digital Output Electrical Characteristics (Continued) CLK Data Valid DATA1 tA HIGH-Z tB DATA2 (For possible 2nd Mic) Data Valid HIGH-Z tA tA - Microphone delay from clock edge to data assertion. tB - Microphone delay from clock edge to high-impedance state. tA > tB to have interim HIGH-Z state in both signals. Figure 3. Interface Timing (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com 5 Unless otherwise specified, all limits are guaranteed for TA=25C, VDD=1.8 V, VIN=94 dB(SPL), fCLK=2.4 MHz, and duty cycle=50%. Amplitude Spectrum [dBFS], Fo = 1000.2135 Hz, Fs = 2.400000 MHz, SNR = 56.89 dB, SNR = 60.88 dB(A), THD = 0.008 % Noise Noise(A) Signal -20 Fo(0)= -26.15 dBFS THD = 81.95 dB SNR = 60.88 dBc(A) SINAD = 56.87 dB ENOB = 13.50 N = 2097152 pts Blackman Window -40 Amplitude [dBFS] -60 -80 Integrated Noise = -87.03 dBFS(A) Spur = -101.34 dBFS, SFDR = 75.19 dBc -100 Fo(1)= -110.28 dBFS Fo(2)= -116.40 dBFS Fo(3)= -120.45 dBFS -120 Fo(4)= -125.03 dBFS -140 -160 1 10 2 3 10 10 4 10 5 10 Frequency [Hz] 6 10 FAN3850A -- Microphone Pre-Amplifier with Digital Output Typical Performance Characteristics Filename: fan3850a-1-BD92M-20110125T122914.dat Figure 4. Noise vs. Frequency Figure 5. THD, SINDA, and SNR vs. Input Amplitude (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com 6 FAN3850A -- Microphone Pre-Amplifier with Digital Output Typical Performance Characteristics (Continued) Figure 6. THD, SINAD, and SNR vs. Output Level 4 Del ta(dB) 0.1971 0.1644 0.1260 0.0954 0.0657 0.0359 0.0139 0.0000 -0.0097 -0.0344 -0.0514 -0.0739 -0.0998 -0.1183 -0.1271 3 2 Gain (dB) Temp (C) -40 -30 -20 -10 0 10 20 25 30 40 50 60 70 80 85 1 0 -1 -2 -3 -4 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Junction Temperature -Tj C Figure 7. Gain vs. Temperature (Nominal Temperature= 25C) (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com 7 VDD Audio Output SPEAKER CLOCK INPUT PreAmp ADC DATA SELECT CLK SDI SDO L/R Serial Port Noise Shaper Low Pass Filter Decimation Interpolation Applications Software Figure 8. Mono Microphone Application Circuit VDD Audio Output FAN3850A -- Microphone Pre-Amplifier with Digital Output Applications Information SPEAKER CLOCK INPUT PreAmp ADC DATA SELECT CLK SDI SDO L/R Serial Port Noise Shaper Low Pass Filter Decimation VDD Interpolation CLOCK Applications Software INPUT PreAmp ADC DATA SELECT Figure 9. Stereo Microphone Application Circuit (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com 8 Diaphragm Airgap Electret Backplate INPUT FAN3850A VDD CLOCK DATA SELECT GND Figure 10. MIC Element Drawing A 0.1 F decoupling capacitor is required for VDD. It can be located inside the microphone or on the PCB very close to the VDD pin. A 100 resistance is recommended on the clock output of the device driving the FAN3850A to minimize ringing and improve signal integrity. Due to high input impedance, care should be taken to remove all flux used during the reflow soldering process. For optimal PSR, route a trace to the VDD pin. Do not place a VDD plane under the device. FAN3850A -- Microphone Pre-Amplifier with Digital Output Applications Information (Continued) The table below pertains to the Marketing Outline drawing on the following page. FAN3850A External Product Dimensions Product ID D E X Y All options 1.260mm 0.860mm 0.145mm 0.145mm (c) 2016 Fairchild Semiconductor Corporation FAN3850A * Rev. 1.6 www.fairchildsemi.com 9 0.03 C E 2X F A 0.570 A1 B 0.485 PIN A1 AREA CU PAD AT BOTTOM D SOLDER MASK 0.03 C 2X TOP VIEW RECOMMENDED LAND PATTERN (NSMD) 0.06 C 0.01 C 0.300 0.254 C SEATING PLANE E D SIDE VIEWS NOTES: A. NO JEDEC REGISTRATION APPLIES. 0.005 C A B B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCES PER 0.570 ASME Y14.5M, 2009. 6X D. DATUM C, THE SEATING PLANE IS DEFINED C 0.485 B BY THE SPHERICAL CROWNS OF THE BALLS. (Y) +/-0.018 E. PACKAGE TYPICAL HEIGHT IS 273 MICRONS A 1 2 F (X) +/-0.018 BOTTOM VIEW F. FOR DIMENSIONS D, E, X, AND Y SEE PRODUCT DATASHEET. G. DRAWING FILENAME: UC006AHrev4. ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. "Typical" parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. 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