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| SA9618A RF AMPLIFIER FOR CD DIGITAL SERVO SYSTEM DESCRIPTION SA9618A can be used for ALPC and signal conversion between CD optical pickup and decoding chip. This IC incorporates an interconnection to general CD optical pickup photodiode, bias voltage VREF generation circuit, RF amplifier and ALPC circuit.(This IC is adaptive for CD-A/V,CD-R,CD-R/W,CD-ROM). FEATURES * RF amplitude automatic adjustment circuit .(It is adaptive for CDA/V,CD-R,CD-R/W,CD-ROM) * Low power consumption.(35mW ~ 3.5V) * ALPC circuit * Operating voltage range:2.8V - 7.0V SOP-16-225-1.27 ORDERING INFORMATION APPLICATIONS * CD Players * VCD Players Device SA9618A Package SOP-16-225-1.27 BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.07.14 Page 1 of 6 SA9618A ABSOLUTE MAXIMUM RATINGS (Tamb=25C) Characteristics Supply Voltage Operating Temperature Power Dissipation Symbol VDD Topr PD Rating -0.5 ~ +12 -20 ~ +75 370 Unit V C mW DC ELECTRICAL CHARACTERISTICS Characteristics Supply voltage Bias Output Of Photoelectric Signal Current Consumption Symbol VDD VREF IDD VDD=5V Test Condition Min. 2.8 --Typ. 5.0 2.5 12 Max. 7.0 --Unit V V mA AC ELECTRICAL CHARACTERISTICS Characteristics Diode Control Input Photoelectric Input 1(A+C) Photoelectric Input 2(B+D) Gain Of RF Signal Symbol MON PD1 PD2 GAIN DA11 KSS213 DA11 KSS213 1MHZ, 300mVpp Test Conditions Min. -0 0 0 0 -Typ. 0.17 ----15 Max. -0.60 0.15 0.60 0.15 -Unit V V V V V dB Note 1: The resistance between Pin RFM and Pin RFO is 5.5K. PIN CONFIGURATION HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.07.14 Page 2 of 6 SA9618A PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol VTH LD MON PD1 PD2 GND VREF NC NC RFM RFO RFI RFRC AGC LDON VDD APC circuit output pin. Diode control input pin. Photoelectric input1 (A+C) pin. Photoelectric input2 (B+D) pin. GND Bias output pin of OEIC. RF level control ON/OFF switching pin Gain select pin for RF signal. RF level control output pin RF amplifier inverted side output pin. RF amplifier gain is determined by the resistor connected between RFO pin and RFM pin. RF amplifier input pin. External time-constant pin for RF level control. The automatic switching pin for optical power. ALPC circuit ON/OFF switching pin. VDD pin. Description Reference level variable pin for RF level control. NOTE: LDON pin is low active in SA9618A, but it must be connected to an external resistor of 150k. FUNCTION DESCRIPTIONS SA9618A can be divided into three parts: Reference voltage generation circuit; RF signal processing circuit incorporating two RF Amplifiers and an RF adder; Automatic switching APC circuit incorporating optical power switching circuit, RF demodulation circuit and automatic optical power control circuit. Reference voltage is half of VDD. It is not only the common level for amplifier in circuit, but also the bias voltage of OEIC. The feedback resistor of each RF Amplifier is 58k. And the gain of RF amplifier is the ratio of the 58k equivalent resistance and external resistor connected between PD1 pin and PD2 pin. When the resistance value is 33k, the gain of RF Amplifier is 1.76. The output of each RF Amplifier is added by RF adder. The gain of RF adder can be adjusted by varying the resistor connected between RFM pin and RFO pin. When the resistance value is 5.5k, the gain of RF summing amplifier is 2.75. The output of Peak value of RF demodulation circuit comes from the output of RF adder. The DC voltage formed by external RC filter of RFRC pin, and it is related to the level of input of PD1 pin and PD2 pin. The DC voltage will increase as the level of the input becomes higher. Optical Power switching circuit is controlled by AGC pin. It has three modes: connected to GND, open, connected to supply voltage. The optical power can be adjusted by varying the voltage of VL. There are five VL values, and it is as follows. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.07.14 Page 3 of 6 SA9618A AGC VCC OPEN OPEN GND GND small small The level of input * large RFRC>VTH RFRC>VTH RFRC>VTH large RFRC>VTH Value of VL 1.25V 0.9V 1.6V 0.7 1.8 Strength of optical power middle weaker stronger weakest strongest Pin LDON controls APC circuit. In SA9618A, APC is set to ON by connecting the LDON pin to GND; and set to OFF by connecting it to VDD, and SA9618A should be connected to an external resistance of 150k between LDON pin and external MCU. TEST CIRCUITS HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn SA9618A REV:1.1 2006.07.14 Page 4 of 6 SA9618A TYPICAL APPLICATION CIRCUIT PACKAGE OUTLINE SOP-16-225-1.27 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.1 2006.07.14 Page 5 of 6 |
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