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| YOUDA INTEGRATED CIRCUIT YD7738 PREAMPLIFIER FOR PLAY OR RECORDER --YD7738 DESCRIPTION The YD7738 is an amplifier system designed for a radio cassette recorder. FEATURES *Recorder play back for Pre amplifier; *Buffer amplifier (Recorder amplifier); *Power amplifier; *Wide operating voltage (3.5V to 9V) BLOCK DIAGRAM 16 15 14 13 12 11 10 9 _ PRE AMP + ALC 1 2 3 4 BUFFER AMP FILTER + POWER AMP _ 5 6 7 8 WuXi YouDa Electronics Co., Ltd Add: No.5 Xijin Road, National Hi-Tech Industrial Development Zone, Wuxi Jiangsu China Tel: 86-510-85205117 86-510-5205106 Fax: 86-510-85205110 Website: www.e-youda.com SHENZHEN OFFICE Tel 86-755-83740369 Fax 86-755-83741418 Ver 5.0 1 of 4 2006-06-30 YOUDA INTEGRATED CIRCUIT PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 YD7738 Name INALC OUTBUF NFBUF NC INP NFP GNDP OUTP Description ALC input Buffer amplifierinput Negative feed back of Buffer amplifier NC Power amplifier input Negative feed back of Power amplifier Power GND Power amplifier output PIN 9 10 11 12 13 14 15 16 Name BS Vcc FIL FIL OUTPRE NFPRE INPRE GNDPRE Description BS Supply voltage Filter input Filter input Pre-amplifier output Negative feed back of Pre-amplifier Pre-amplifier input Pre-GND ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Output Current Power Dissipation Operating Temperature Storage Temperature SYMBOL Vcc Iop PD Tamb Tstg (Tamb=25) VALUE 14 1.5 1.2 -20 to+75 -55 to 150 UNIT V A W ELECTRICAL CHARACTERISTICS Unless otherwise specified, Vcc=6V, f=1kHz, Tamb=25 PARAMETER Total Quiescent Current Pre-Amplifier Open Loop Voltage Gain Closed Loop Voltage Gain Max. Output Voltage Input Impedance Equivalent Input Noise Voltage WuXi YouDa Electronics Co., Ltd Gvo1 Gv1 VOM1 Zi VNO1 THD1.0% Vo=0.5Vrms Rg=0 55 70 40 0.7 30 1.4 2.5 dB dB V k V Iccq Vcc=3.5V Vcc=6V 7.5 11 35 mA mA SYMBOL TEST CONDITIONS MIN TYP MAX UNIT 2 of 4 Website: www.e-youda.com YOUDA INTEGRATED CIRCUIT Pre Amplifier + Buffer Amplifier Closed Loop Voltage Gain Max. Output Voltage Equivalent Output Noise Voltage ALC Effect ALC Range Power Amplifier Open Loop Voltage Gain Closed Loop Voltage Gain Gvo3 Gv3 RL=4,THD=10% Maximum Out Power POM Vcc=9V,RL=4, THD=10% Rg=0,Gv=40dB 0.8 60 70 40 0.96 Gv2 Vo2 VNO2 ALC1 ALC2 Pre-Amp: Gv=40dB Buff-Amp: Gv=20dB THD=3.0% Rg=0, Gv2=60dB VIN= -60dBm-20dBm THD1.0% 1.5 60 1.7 1.2 2 60 YD7738 dB V 2.5 mV dB dB dB dB W 2.0 0.3 mV Output Noise voltage APPLICATION CIRCUIT VNO3 S4 + RADIO ATT MIC T R S S1 S2 R/P HEAD BIAS REC S3 390k + 47 + 1 5.6k S5 560p 1k 330 + 10 1000p 51k 6.2k Rf + 47 1 2 3 + 3.3 16 15 22 220 12k 0.01 27k 330k 560p 14 13 + 0.01 220 330 100 + + 12 11 10 Vcc R + S T S6 0.47 9 + 10k + YD7738 4 5 6 7 8 47 3.3 680p SPEAKER + 1000 4 RECORDING EQ 0.022 0.082 WuXi YouDa Electronics Co., Ltd 3 of 4 Website: www.e-youda.com YOUDA INTEGRATED CIRCUIT 1 Rf (pin6) controls the gain of power amplifier Rf (pin6) value Gain of power amplifier #2 S1----S6 apply at play estate 180 42dB 200 40 dB YD7738 220 38 dB OUTLINE DRAWING WuXi YouDa Electronics Co., Ltd 4 of 4 Website: www.e-youda.com |
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