YD7738 YOUDA INTEGRATED CIRCUIT 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 FILTER _ PRE AMP BUFFER AMP + + POWER AMP _ ALC 1 2 3 4 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 YD7738 YOUDA INTEGRATED CIRCUIT PIN DESCRIPTION PIN Name Description PIN Name Description 1 INALC ALC input 9 BS BS 2 OUTBUF Buffer amplifierinput 10 Vcc Supply voltage 3 NFBUF Negative feed back of Buffer amplifier 11 FIL Filter input 4 NC NC 12 FIL Filter input 5 INP Power amplifier input 13 OUTPRE 6 NFP Negative feed back of Power amplifier 14 NFPRE Negative feed back of Pre-amplifier 7 GNDP Power GND 15 INPRE Pre-amplifier input 8 OUTP Power amplifier output 16 GNDPRE Pre-GND ABSOLUTE MAXIMUM RATINGS Pre-amplifier output (Tamb=25℃) PARAMETER SYMBOL VALUE UNIT Supply Voltage Vcc 14 V Output Current Iop 1.5 A Power Dissipation PD 1.2 W Operating Temperature Tamb -20 to+75 ℃ Storage Temperature Tstg -55 to 150 ℃ ELECTRICAL CHARACTERISTICS （Unless otherwise specified, Vcc=6V, f=1kHz, Tamb=25℃） PARAMETER SYMBOL Quiescent Current Iccq TEST CONDITIONS MIN Vcc=3.5V 7.5 Vcc=6V 11 TYP MAX UNIT Total mA 35 mA Pre-Amplifier Open Loop Voltage Gain Gvo1 Closed Loop Voltage Gain Gv1 Max. Output Voltage VOM1 Input Impedance Equivalent Input Noise Voltage WuXi YouDa Electronics Co., Ltd 55 70 dB 40 dB THD≤1.0% 0.7 V Zi Vo=0.5Vrms 30 kΩ VNO1 Rg=0 1.4 2 of 4 Website: www.e-youda.com 2.5 μV YD7738 YOUDA INTEGRATED CIRCUIT Pre Amplifier + Buffer Amplifier Closed Loop Voltage Gain Gv2 Pre-Amp: Gv=40dB Buff-Amp: Gv=20dB Max. Output Voltage Vo2 THD=3.0% Equivalent Output Noise Voltage VNO2 Rg=0, Gv2=60dB 1.2 ALC Effect ALC1 VIN= -60dBm～-20dBm 2 dB ALC Range ALC2 THD＜1.0% 60 dB 70 dB 40 dB 1.5 60 dB 1.7 V 2.5 mV Power Amplifier Open Loop Voltage Gain Gvo3 Closed Loop Voltage Gain Gv3 60 RL=4Ω,THD=10% Maximum Out Power POM Output Noise voltage 0.8 0.96 W Vcc=9V,RL=4Ω, THD=10% 2.0 Rg=0,Gv=40dB 0.3 VNO3 mV APPLICATION CIRCUIT Vcc S4 + RADIO T MIC 12k 0.01μ 27k 330k 22μ ATT R 220Ω S 560p + 3.3μ 16 S1 15 14 0.01μ 220μ 1 S3 2 3 4 + S6 T S 0.47μ 330μ 100μ + + 12 11 10 9 YD7738 S2 R/P HEAD 13 R + 5 + 10k + 47μ 3.3μ 6 7 8 390k BIAS REC RECORDING EQ + 47μ + 1μ 5.6k S5 WuXi YouDa Electronics Co., Ltd 560p 1k 0.022μ 6.2k 1000p 330Ω + 10μ 3 of 4 51k Rf + 47μ 680p SPEAKER + 1000μ 4Ω 0.082μ Website: www.e-youda.com YD7738 YOUDA INTEGRATED CIRCUIT ＃1： Rf (pin6) controls the gain of power amplifier Rf (pin6) value 180Ω 200Ω 220Ω Gain of power amplifier 42dB 40 dB 38 dB #2： S1----S6 apply at play estate OUTLINE DRAWING WuXi YouDa Electronics Co., Ltd 4 of 4 Website: www.e-youda.com