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Technical content
Features
Patent Pendin g 3 Phase Power Line Shift Charge Pump Eliminates Need for DC-Blocking Capacitors TrueCapFree Architecture, Output Biased at 0V (S ystem Ground) Excellent Low Frequency Fidelity 80dB PSRR at 1kHz Less than 1µA Shutdown Current Support Both Fully Differential and Single-Ended Inputs Short Circuit and Over Temperature Protection Selectable Gain Settings: -6dB, 0dB, 3dB and 6dB Available in Space Saving Packages: U-QFN3030-16 (Type US) Lead Free and Green Devices Available (RoHS Compliant) Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green Device (Note 3) Pin Assignments 5 6 7 8 13141516 INL- INL+ INR+ INR- OUTR HPVSS PGND CAP- CAP+ PVDD HPVDD OUTL SGND EN Top View U-QFN3030-16 5 6 7 8 13141516 INL- INL+ INR+ INR- OUTR HPVSS CAP- PGND CAP+ HPVDD EN PVDD SGND OUTL Top View U-QFN3030-16
Applications
Smart Phones/Cellular Phones Notebook Computers Portable DVD Player Personal Digital Assistants (PDAs) Electronic Dictionaries Digital Still Cameras Portable Gaming Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Hal ogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. (Top View) U-QFN3030-16 (Type US) U-QFN3030-16 (Type US) (Top View)
Document number: DS36456 Rev. 2 - 2 2 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Typical Applications Circuit Typical Application Configuration with Differential Input Signals Typical Application Configuration with Single-Ended Input Signal PAM8901/ PAM8908 PAM8901/ PAM8908
Document number: DS36456 Rev. 2 - 2 3 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Pin Descriptions Pin Number Pin Name I/O/P Function PAM8901 PAM8908 1 1 INL- I Inverting left input for differential signals. 2 2 INL+ I Non-inverting left input for differential signals. 3 3 INR+ I Inverting right input for differential signals. 4 4 INR- I Non-inverting right input for differential signals. 5 6 G0 I Gain select bit 0 6 7 G1 I Gain select bit 1 7 5 OUTR O Right headphone amplifier output. Connect to right terminal of headphone jack. 8 8 HPVSS P Charge pum p output and negative power supply for output amplifiers; connect 1µ F capacitor to GND 9 10 PGND P Power Ground 10 9 CAP- O Charge pump negative flying cap. 11 11 CAP+ O Charge pump positive flying cap. 12 14 PVDD P Power VDD. 13 12 HPVDD O Positive power supply for headphone amplifiers. Charge pump positive half VDD output. 14 16 OUTL O Left headphone amplifier output. Connect to left terminal of headphone jack. 15 15 SGND I Amplifier reference voltage. 16 13 EN I Amplifier enabled. Connect to logic low to shutdown; connect to logic high to activate Functional Block Diagram HPVDD HPVSS Resistor Array PVDD Supply Control PGND OUTL Short-Circuit Protection Thermal Protection OUTR CAP+ CAP- 1uF
3 Phase
*Patent Pending On/Off Pop Free ENSGND INR- INR+ INL- INL+ Resistor Array Gain Select HPVDD 1uF1uF HPVSS HPVSS HPVDD
Document number: DS36456 Rev. 2 - 2 4 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Absolute Maximum Ratings (@TA = +25° C, unless otherwise specified.) (Note 4) These are stress ratings only and functional operation is n ot implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Parameter Rating Unit Supply Voltage (PVDD) 6.0 V Input Voltage (INR+, INR-, INL+, INL-) HPVSS -0.3 to HPVDD +0.3 V Control Interface Voltage (G0, G1, EN) -0.3 to PVDD +0.3 V Storage Temperature -65 to +150 °C Maximum Junction Temperature +150 Soldering Temperature +250, 10sec Note: 4. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are st ress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device r eliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. Recommended Operating Conditions (@TA = +25° C, unless otherwise specified.) Symbol Parameter Rating Unit VDD Supply Voltage Range 2.5 to 5.5 V TA Ambient Temperature Range -40 to +85 TJ Junction Temperature Range -40 to +125 Thermal Information (@TA = +25° C, unless otherwise specified.) Symbol Parameter Package Max Unit θJA Thermal Resistance (Junction to Ambient) U-QFN3030-16 (Type US) 35 ° C/W θJC Thermal Resistance (Junction to Case) U-QFN3030-16 (Type US) 14 ° C/W
Document number: DS36456 Rev. 2 - 2 5 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Electrical Characteristics (@TA = +25° C, PVDD = 3.6V, RL = 16Ω, unless otherwise specified.) Symbol Parameter Test Conditions Min Typ Max Units PVDD Supply Voltage — 2.5 — 5.5 V IQ Quiescent Current EN = PVDD, No Load — 4 — mA PO Output Power per Channel THD = 1%, f = 1kHz, RL = 16Ω — 35 — mW THD = 1%, f = 1kHz, RL = 32Ω — 25 — mW ISD Shutdown Current EN = 0V, PVDD = 2.5V to 5.5V — 0.1 1 µA VIH EN High Level Input Voltage — 1.4 — — V VIL EN Low Level Voltage — — — 0.6 V VGH G0, G1 High Level Input Voltage — 1.4 — — V VGL G0, G1 Low Level Voltage — — — 0.6 V VOS Output Offset Voltage — — 1 5 mV AV Closed-Loop Voltage Gain G0 = 0V, G1 = 0V — -6 — dB G0 = PVDD, G1 = 0V — 0 — dB G0 = 0V, G1 = PVDD — 3 — dB G0 = PVDD, G1 = PVDD — 6 — dB PSRR Power Supply Rejection Ratio Input A C-GND, f + 1kHz, VPP = 200mV — 75 — dB THD+N Total Harmonic Distortion Plus Noise PO = 20mW, f = 1kHz — 0.03 — % SNR Signal to Noise Ratio PO = 20mW, into 16Ω — 100 — dB EN Noise Output Voltage A-Weighted — 10 — µVRMS CS Crosstalk PO = 15mW, f = 1kHz — 80 — dB fOSC Charge Pump Switching Frequency — 1.2 1.5 1.8 MHz tON Start-Up Time EN from low to high — 0.4 — Ms OTP Thermal Shutdown Threshold — +150 — °C OTPH Thermal Shutdown Hysteresis Hysteresis — +20 — °C
Document number: DS36456 Rev. 2 - 2 6 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Typical Performance Characteristics (@TA = +25° C, PVDD = 3.6V, f = 1kHz, Gain = 6dB, unless otherwise specified.)
Document number: DS36456 Rev. 2 - 2 7 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Typical Performance Characteristics (Cont.) (@TA = +25° C, PVDD = 3.6V, f = 1kHz, Gain = 6dB, unless otherwise specified.)
Document number: DS36456 Rev. 2 - 2 8 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Typical Performance Characteristics (Cont.) (@TA = +25° C, CIN = 10µ F, CO = 10µ F, L = 4.7µ H, unless otherwise specified.)
Document number: DS36456 Rev. 2 - 2 9 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908
Application Information
The basic PAM8901 / PAM8908 application circuit is shown in page 2. Gain Control The PAM8901 / PAM8908 has four gain settings which are controlled with pins G0 and G1. The following table gives an overview of the gain function. G0 Voltage G1 Voltage Amplifier Gain ≤0.6V ≤0.6V -6dB ≥1.4V ≤0.6V 0dB ≤0.6V ≥1.4V 3dB ≥1.4V ≥1.4V 6dB Input Coupling Capacitors Input coupling capacitors block any DC bias from the audio source and ensure maximum dynamic range. Input coupling capacitors also minimize PAM8901 / PAM8908 turn-on pop to an inaudible level. The input capacitors are in series with PAM8901 / PAM8908 internal input resistors, creating a high-pass filter. The following Equation calculates the highpass filter corner frequency. CR2 ININTTC The input impedance, RIN, is dependent on device gain. Larger input capacitors decrease the corner frequency. See the following table for input impedance values. G0 Voltage G1 Voltage RIN ≤0.6V ≤0.6V 26.4kΩ ≥1.4V ≤0.6V 19.8kΩ ≤0.6V ≥1.4V 16.5kΩ ≥1.4V ≥1.4V 13.2kΩ For a given high-pass cutoff frequency, the minimum input coupling capacitor is found as: Rf2 INCTTIN Example: Design for a 20Hz corner frequency with a PAM8901 / PAM8908 gain of +6dB. The input impedance table gives RIN as 13.2kΩ. The CIN Equation shows the input coupling capacitors must be at least 0 .6µ F to achieve a 20Hz highpass corner frequency. Choose a 0.68µ F standard value capacitor for each PAM8901 / PAM8908 input (X5R material or better is required for best performance). Charge Pump Flying Capacitor, HPVDD Capacitor and HPVSS Capacitor The PAM8901 / PAM8908 uses a built-in charge pump to generate a positive and negative voltage supply for the headphone am plifiers. The charge pump flying capacitor connects between CAP+ and CAP-. It transfers charge to generate the positive and negative supply voltage. The HPVDD capacitor or HPVSS capacitor must be at least equal in or larger than value to the flying capacitor to allow maximum charge transfer. Use low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or better is required for best performance) to maximize charge pump efficiency. Typical values are 1µF for the HPVDD, HPVSS and flying capacitors. Power Supply Decoupling Capacitors The PAM8901 / PAM8908 TrueCapFree headphon e amplifier requires adequate power supply decoupling to ensure that output noise and total harmonic distortion (THD) remain low. Use good low equivalent-series-resistance (ESR) ceramic capacitors (X5R material or better is required for best performance). Place a 2.2µ F capacitor within 5 mm of the PVDD pin. Reducing the distance between the decoupling capacitor and PVDD minimizes parasitic inductance and resistance, improving PAM8901 / PAM8908 supply rejection performance. Use 0402 or smaller size capacitors if possible.
Document number: DS36456 Rev. 2 - 2 10 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Application Information (Cont.) Power Supply Sequencing Use input coupling capacitors to ensure inaudible turn-on pop. Activate the PAM8901 / PAM8908 after all audio sources have been activated and their output voltages have settled. On powerd own, deactivate the PAM8901 / PAM8908 befor e deactivating the audio input source. The EN pin controls device shutdown: Set to 0.6V or lower to deactivate the PAM8901 / PAM8908; set to 1.4V or higher to activate. TrueCapFree Headphone Amplifiers The TrueCapFree amplifier architecture operates from a single supply voltage and uses two internal charge pumps to generate a positive supply and a rail for the headphone amplifier. The output voltages are centered around 0V and are capable of positive and negative voltage swings as shown in the following drawing. TrueCapFree amplifiers require no output DC-blocking capacitors. The headphone connector shield pin connects to ground and will interface with headphones and non-headphone accessories. The PAM8901 / PAM8908 is a TrueCapFree amplifier. LAYOUT RECOMMENDATIONS Exposed Pad on PAM8901 / PAM8908 Solder the exposed metal pad on the PAM8901 / PAM8908 U-QFN3030-16 (Type US ) package to the landing pad on the PCB. Connect the landing pad to ground or leave it electrically unconnected (floating). Do not connect the landing pad to PVDD or to any other power supply voltage. If the pad is grounded, it must be connected to the same ground as the PGND. Soldering the thermal pad is required for mechanical reliability and enhances thermal conductivity of the package. GND Connections The SGND pin is an input reference and must be connected to the headphone ground connector pin. This ensures no turn-on pop and minimizes output offset voltage. Do not connect more than ± 0.3V to SGND. PGND is a power ground. Connect supply decoupling capacitors for PVDD, HPVDD, and HPVSS to PGND. Power Supply Connections Connect the supply voltage to the PVDD pin and decouple it with an X5R or better capacitor. Place both PVDD capacitors within 5mm of PVDD pin on the PAM8901 / PAM8908. Ensure that the ground connection of PVDD capacitor has a minimum length return path to the device. Failure to properly decouple the PAM8901 / PAM8908 may degrade audio or EMC performance.
Document number: DS36456 Rev. 2 - 2 11 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908
Ordering Information
Package Type Pin Configuration Shipping Package J: U-QFN3030-16 (Type US) E: 16 pin R: 7" Tape & Reel Part Number Package Type Standard Package PAM8901JER U-QFN3030-16 (Type US) 3000 Units/ Tape & Reel PAM8908JER U-QFN3030-16 (Type US) 3000 Units/ Tape & Reel Marking Information Top View U-QFN3030-16 P8901 XXXYW XXX : Internal Code Y: Year W: Weak Top View U-QFN3030-16 P8908 XXXYW XXX : Internal Code Y: Year W: Weak (Top View) U-QFN3030-16 (Type US) (Top View) U-QFN3030-16 (Type US)
Document number: DS36456 Rev. 2 - 2 12 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. U-QFN3030-16 (Type US) Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. U-QFN3030-16 (Type US) U-QFN3030-16 (Type US) Dim Min Max Typ A 0.500 0.600 0.550 A1 0.000 0.050 -- A3 0.152 REF b 0.200 0.300 0.250 D 2.950 3.050 3.000 D2 1.600 1.700 1.650 e 0.500 BSC e1 1.500 REF E 2.950 3.050 3.000 E2 1.600 1.700 1.650 L 0.350 0.450 0.400 All Dimensions in mm Dimensions Value (in mm) C 0.500 X 0.350 X1 0.570 X2 1.800 X3 3.300 Y 0.570 Y1 1.800 Y2 3.300 b A Pin #1 ID (Laser Mark) Seating Plane D E L e C Y X
Document number: DS36456 Rev. 2 - 2 13 of 13 www.diodes.com October 2016 © Diodes Incorporated NEW PRODUCT PAM8901 / PAM8908 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, cor rections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability a rising out of the application or use of this document or any product described herein; neither does Diode s Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such appli cations shall assume all risks of such use and will agree to hold Diodes Inco rporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign paten ts pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemn ify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2016, Diodes Incorporated www.diodes.com