FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Features Description Regulated positive supply Dual speaker drivers with mono/stereo switch capability Capable of driving 16mW RMS per channel The FAN3800 is a low-cost solution that integrates the many discrete parts currently used in stereo headset applications. It provides mono / stereo speaker drivers and a complete microphone interface. Additionally, the FAN3800 allows headset detection and identification through a 5-pin, enhanced mini-USB (EMU) bus. Manual and remote send-end switching is supported. Manual and remote send-end switch interface Negative supply generator allows ground-centered output swing Complete external microphone interface Enhanced mini-USB bus detection and interface circuitry Pop and click suppression FAN3800 delivers a complete solution for interfacing an external microphone. The microphone interface provides a regulated, high PSRR supply, differential input sense to single-ended output driver amplifiers, and output muting. Gain is fixed at 36dB and can be attenuated externally with a resistor divider network. SW1 EMU to 2.5 or 3.5 adapter for stereo headset with microphone CP2 EMU to 3.5mm stereo headphone adapter CP1 One-piece stereo/mono headset with microphone Send-end switching automatically routes the microphone output to the D+ output. When activated, the speakers switch from stereo to mono mode, both driven by the D- input. Pop and click noise is minimized during switching. Send-end information can be generated manually through an external switch or through the EMU bus interface. VS MLP 24-pin package GND 2kV ESD (HBM) protection V+ Single 2.7V to 4.5V operation Applications The FAN3800 speaker drivers are designed to operate with a ground-centered output signal. This allows removal of large and expensive DC blocking capacitors. In addition, it allows interfacing with externally powered speakers. The speaker drivers are capable of driving up to 16mW RMS per channel. CPOUT ID V- MUTE MLP-24 4x4mm BYPASS MIC+ SPKLOUT VS SPKROUT MIC- D+ SPKRIN SPKLIN D- GND MICSW MICOUT MICSUP Figure 1. FAN3800 Pin Out Ordering Information Part Number Pb-Free FAN3800MLP24X © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 Package Packing Method 24-Pin Molded Leadless Package (MLP) Pack www.fairchildsemi.com FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface October 2007 V+ CP1 CP2 CPOUT VVpos VS SPKLOUT 2.5V Suppl y VS Vpos Neg Suppl y MIC BIAS V0dB Vpos SPKLIN VBUS V- D- D- D- D+ SPKROUT ID Vpos SPKRIN 0dB V- GND BYPASS R mono D+ MICBIAS R stereo MICSUP R mic ID Bias MIC+ 38dB SEND/END N.O. DSW 1 MIC- Rid 102k Audi o Removal Filter MICOUT Bias GND GND V+ MICSW MUTE R1 MUTE R mic FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Block Diagram R2 Figure 2. Block Diagram © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 www.fairchildsemi.com 2 CP2 CP1 VS GND V+ SW1 CPOUT ID V- MUTE MLP-24 4x4mm BYPASS MIC+ SPKLOUT VS SPKROUT MIC- D+ SPKLIN SPKRIN D- GND MICSW MICOUT MICSUP Figure 3. FAN3800 Pin Out Pin Definitions Pin # Name Type Description 1 ID Input Identification pin 2 MUTE Input Microphone mute control input 3 BYPASS Output 4 MIC+ Input High-side differential MIC input 5 MIC- Input Low-side differential MIC input 6 MICSUP Output Microphone supply pin 7 MICOUT Output Microphone amplifier output tap for setting gain and shifting the DC bias level 8 MICSW Input Output of microphone amplifier AC coupled to the D+ switch 9 GND Input IC ground 10 D- Input DC biased EMU bus input for send-end enable 11 SPKLIN Input Left audio channel input 12 SPKRIN Input Right audio channel input 13 D+ Input DC biased EMU bus input for identification 14 External 100nF capacitor used for pop/click suppression Output Driven by MICOUT in mono mode SPKROUT Output Right speaker driver output 15 VS Input 16 SPKLOUT Output 17 V- Input 18 CPOUT Output Charge pump unfiltered output 19 CP2 I/O Charge pump external cap pin 20 CP1 I/O Charge pump external cap pin 21 VS Input Supply input from host device (3.3V typical) 22 GND Input IC ground 23 V+ Output 24 SW1 Input © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 Supply input from host device (3.3V typical) FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Pin Assignments Left speaker driver output Filtered negative supply driven by CPOUT Positive power supply output for decoupling capacitor Send-end switch input www.fairchildsemi.com 3 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 VS Parameter Supply Voltage VI/O Analog and Digital I/O TJ Junction Temperature TSTG TL Storage Temperature Range Min. Max. Unit -0.3 +6.0 V GND-0.3 VCC+0.3 V -40 Lead Temperature (Soldering, 10 seconds) +150 °C +80 °C +240 °C 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. Typ. Max. Unit VS Supply Voltage 2.7 3.3 4.5 V TA Temperature Range -20 27 60 °C Speaker Load Impedance 14 32 ZLOAD VIN D+/DVBIAS D+/D ΘJA D+,D- ,SPKLIN,SPKRIN Input Range 0 D- / D+ Bias Level in Audio Mode 1.25 Package Thermal Resistance, JEDEC Standard Multi-Layer Boards, Still Air © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 1.39 40 Ω VS V 1.53 V °C/W FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Absolute Maximum Ratings www.fairchildsemi.com 4 TA = 25°C, VS = 3.0V, audio inputs at -6dBV and AC coupled with 1µF, speaker outputs DC coupled into 16Ω loads referenced to 1kHz, ID = VIL, CBYPASS = 100nF, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units 5.6 6.0 mA 10 ms Power Supply Characteristics IS tSUPPLY PSRRMIC PSRRSPKR VMIC Supply Current(1) Power-Up Stabilization Time Power Supply Noise Rejection at MIC Output Power Supply Noise Rejection at Speaker Output Microphone Bias Supply(1) No load V+, V- within 90% of final value 217Hz 12% duty cycle square wave 2.7V to 3.2V at VS -80 dBV(p) Output (D+) in Vrms as single wideband noise measurement within 20Hz – 20kHz, A weighted -80 dBV(a) Supply current = 1mA 2.0 2.0 Output (D+) in Vrms as single wideband measurement within psophometric filter 217Hz 12% duty cycle square wave 2.7V to 3.2V at VS 2.1 2.2 V D+/D- Line Characteristics VOH D+ Output High Voltage D+(1) During detection, mono mode (external 150k ± 30% D+ pull-up to 2.775V 3% VOL D+ Output Low Voltage D+ (1) During detection, stereo mode (external 150k ± 30% D+ pull-up to 2.775V 3% 0.8 V VOL D- Output Low Voltage D-(1) During detection (external 4M pull-down to GND) 0.8 V VEN LOW D- Voltage to Disable MFB(1) Multi-function button disabled 0.5 V VEN HIGH D- Voltage to Enable MFB(1) Multi-function button enabled 1.0 V 0.8 V V ID Line Characteristics VOH Output High Voltage(1) Send-end active, 102kΩ pull-down resistor VOL Output Low Voltage(1) Send -end Active, 102kΩ pull-down resistor VIH Input High Voltage – Stereo Mode(1) Voltage divider from phone and external 102kΩ pull-down resistors VIL Input Low Voltage – Mono Mode(1) Voltage divider from phone and external 102kΩ pull-down resistors 1.0 V IIN Input Leakage Current(2) Send-end inactive 100 nA 0.2 1.4 V V Input/Output Impedance ZiD- D- Input Impedance(1) D-, mono mode; D-, stereo mode 33 kΩ ZiD+ D+ Input Impedance(1) D+, stereo mode 33 kΩ ZOD+ D+ Output Impedance(2) D+, mono mode MICSUP input Impedance(2) VS = 0 Maximum Load Impedance on D+(2) Mono mode Maximum Load Impedance on SPKROUT & SPKLOUT(2) Stereo or mono mode VIH Input High Voltage(1) Mute-line floating VIL Input Low Voltage(1) Zi MICSUP ZL D+ ZL SPKR 200 200 Ω kΩ 300 pF 1 nF FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Electrical Characteristics Mute Input 1.5 V 0.8 V Continued on the following page… © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 www.fairchildsemi.com 5 TA = 25°C, VS = 3.0V, audio inputs at -6dBV and AC coupled with 1µF, speaker outputs DC coupled into 16Ω loads referenced to 1kHz, ID = VIL, CBYPASS = 100nF, unless otherwise noted. Symbol Parameter Conditions Min. Typ. 37.5 38.0 Max. Units 38.5 dB dB Microphone Pre-Amplifier AMIC FRMIC Gain(1) 1kHz, no divider on MICOUT, Input = -58dBV Frequency Response(1) Input = -58dBV, no divider on MICOUT, referenced to 1kHz THDMIC Distortion(2) NOISEMIC Idle Noise(2) 20Hz to 100Hz -3.0 0.5 100Hz to 20kHz -0.5 0.5 Input = -44dBV at 1kHz Microphone output resistors, R1 = R2 = 800Ω Input loaded with 2Ω through 1µF cap. Psophometric weighted output -65 dB SINAD -80 dBVp 0.5 dB dB Speaker Amplifier ASPK FRSPK Gain(1) Input = -26dBV at 1kHz, 16Ω loads (1) Frequency Response Input = -26dBV -0.5 0 20Hz to 15kHz referenced to 1kHz -1.5 1.5 15kHz to 20kHz referenced to 1kHz -0.5 0.5 THDSPK Distortion(2) Input = -6dBV at 1kHz -65 dB SINAD NOISESPK Idle Noise(2) No input -75 dBV(A) XTLKMS Microphone to Speaker Crosstalk(2) Input at microphone to give D+ = -6dBV, measure at speaker output -65 dB XTLKSM Speaker to Microphone Crosstalk(2) D- = -6dBV, measure at D+ -65 dB AMATCH Matching of L & R Channels(2) Input = -26dBV, 20Hz to 20kHz 0.5 dB Crosstalk Between L & R Channel(2) Input = -26dBV -65 dB XTLKSPK Notes: 1. 100% tested at TA = 25°C. 2. Guaranteed by design and characterization. 3. Microphone path noise measured using psophometric weighting function (see Figure 4). 4. Speaker path noise measured using A-type weighting. © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Electrical Characteristics (Continued) www.fairchildsemi.com 6 MIC Path Psophometric Weighting 4 -6 -16 Relative Gain (dB) -26 -36 -46 -56 -66 -76 -86 -96 10 100 1000 Frequency (Hz) Hi Limit Gain (dB) Low Limit Figure 4. Microphone Path Psophometric Weighting Function © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 10000 FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Typical Characteristics www.fairchildsemi.com 7 FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface Physical Dimensions Figure 5. 24-Pin Molded Leadless Package (MLP) © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0 www.fairchildsemi.com 8 FAN3800 — Mono / Stereo Audio Amplifier with Microphone Pre-Amplifier and EMU Interface 9 www.fairchildsemi.com © 2007 Fairchild Semiconductor Corporation FAN3800 • Rev. 1.0.0