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| SA9614 RF AMPLIFIER FOR DIGITAL SERVO SYSTEM DESCRIPTION SA9614 is a RF amplifier, used for signal conversion and auto laser power control (ALPC) between the CD optical pickup head and decoding chip. SA9614 includes interface of CD optical diode, RF signal amplifier and equalizer, VREF generation circuit, automatic optical power switching circuit (it suits for CD-A/V, CD-R, CD-R/W, CD-ROM). SOP-16-225-1.27 FEATURES * RF amplitude automatic adjustment circuit (it suits for CD-A/V, CDR, CD-R/W, CD-ROM). * RF signal equalizer (including VCA). * Auto laser power control circuit (ALPC). * Operating voltage: 3V -7V, power dissipation (150mW @5V). Device Package SOP-16-225-1.27 ORDERING INFORMATION APPLICATIONS * CD Players * VCD Players SA9614 BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2006.07.28 Page 1 of 8 SA9614 ABSOLUTE MAXIMUM RATING (Tamb=25C) Characteristics Power Supply Voltage Operating Temperature Max. Power Dissipation Symbol VDD Tmax Pmax Rating -0.5 ~ +9 -20 ~ +75 500 Unit V C mW DC ELECTRICAL CHARACTERISTICS Characteristics Power Supply Voltage Photo-Electrical Bias Output Voltage Symbol VDD VREF VDD=5V VDD=5V Test conditions Min. 3.0 Typ. 5.0 30 2.5 Max. 7.0 Unit V mA V AC electrical characteristics (VDD=5V) Characteristics Diode Monitor signal Input Photoelectric Signal Input Symbol MON PD DA11 KSS213 PD is input pins, RFO is output pin RFG=VREF+1V RFG=VREF-1V VCA Gain Control Range VGA Adjust RFC to make1.6MHz as the maximum advance frequency, and BST is no connection. VFC=VREF, RFC=300K Equalizer Center Frequency 1 FC1 VFC=VREF, RFC=50K Input 1.6MHz BST=VREF+1V, BST=VREF-1V, Adjust RFC to Boost Of Equalizer Center GFC make1.6MHz as the maximum advance frequency, and BST is no connection. 1.10 11.80 dB 0.4 2.4 MHZ 1.40 14.55 dB 0 0 15 Test conditions Min. Typ. 0.13 0.60 0.15 Max. Unit V V V dB RF Signal Gain GAIN Frequency HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2006.07.28 Page 2 of 8 SA9614 PIN CONFIGURATION PIN DESCRIPTION Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin name RFC LD MON PD RFM GND VREF RFG RFAC EQIN RFO RFI RFRC BST LD_ON VCC I/O I O I I I I O I O I O I O I I I APC circuit output pin. Diode monitor signal feedback pin.. Photoelectric signal Input RF amplifier inverted side output pin. RF amplifier gain is determined by the resistor connected between RFO pin and RFM pin. Ground OEIC bias output pin.. Equalizer gain setting pin.. Equalizer output pin.. Equalizer input pin.. RF signal amplifier output pin. RF signal amplitude detect input pin (coupling from RFO). RF signal amplitude detect voltage generate pin (connect RC components). Equalizer center frequency setting. pin.. APC circuit switch ON/OFF, low active. Power supply pin.. Pin descriptions Input for setting the EQ center frequency HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2006.07.28 Page 3 of 8 SA9614 FUNCTION DESCRIPTION SA9614 includes RF signal amplifier, RF equalizer, RF amplitude detector, auto laser power controller, etc. RF amplifier +- The above figure is RF signal channel diagram. PD is input pin of laser pickup head. RFO is the output pin., RFM is the feedback input pin of the amplifier. The feedback resistor of PD input amplifier is designed as 58k, so the low frequency gain of first amplifier is AV1=58K/RIN. The gain of the second amplifier is determined by the resistor Rf connected between RFO pin and RFM pin . AV2=Rf /2K. Then the low frequency gain of RF amplifier is: AV=AV1*AV2=Rf*58K/(RIN*2). Frequency response is determined by the capacitor paralleled with input adder, and the bandwidth of -3dB is 1.8MHz. RF SIGNAL AMPLITUDE DETECTOR The input signal of RF amplitude detector is from the RF amplifier output pin RFO. In order to enlarge the linear range of detect, this circuit adopts DC coupling input and AC coupling input, which refers to the above figure. RFRC connects with RC filter components which determine the filter time constant. RFRC pin will obtain a DC voltage correlated with RF amplitude according to the RFO input signal. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn +- REV:1.0 2006.07.28 Page 4 of 8 SA9614 APC CIRCUIT The constant power circuit is used to generate the constant power when diode is in the different state. APC circuit realizes the constant power by monitoring the receiving power of diode, thereby to stabilize the RF input amplitude. In order to adapt to RF input signal of different disks, APC circuit adds the auto power adjusting function. It is to adjust the output power by detecting the RF input signals and thus to adapt to various disks. In the above figure, MON pin is the constant power monitor pin, LD is driver output pin which connects with a PNP transistor. LD_ON is the enable port of APC circuit, high level active. EQUALIZER (INCLUDE VCA AND OUTPUT STAGE) BST 14 RFC 1 EQIN 10 RFG 8 VREF EQ circuit VCA EQ 9 RFAC EQ curve The equalizer includes controllable gain amplifier VCA , equalizer circuit and signal amplifier. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2006.07.28 Page 5 of 8 SA9614 RFG is the gain control port of VCA, and EQ_IN is signal input port. When the voltage of RFG is equal to VREF, the low frequency gain is 0dB; when the voltage of RFG is equal to VREF+1V, the gain of VCA is +8dB; when the voltage of RFG is equal to VREF-1V, the gain of VCA is -8dB. In the actual applications, it can adjust the output amplitude through adjusting the voltage of RFG. The signal enters the equalizer after passing through the control gain amplifier. The main parameter center frequency and boost gain can be set by RFC and BST. The center frequency of the equalizer curve can be adjusted by changing the ground resistance of RFC, and the external resistor is usually between 50 KHz and 200 KHz. The center frequency is between 1MHz and 5MHz. Setting the voltage of BST can regulate the boost gain of center frequency. When BST is equal to VREF, the gain is set at +5dB; when BST is equal to VREF+1, the gain is set at +8dB; when BST is equal to VREF-1; the gain is set at -1dB. You will get the needed equalizer curve to satisfy the system design by adjusting RFC and BST. The signal amplitude reduced after equalizing, so we need to add an amplifier to compensate the gain, increase the drive capability and reduce the output resistance. RFAC is the output port of the amplifier. After the signal passing through the last amplifier, the output amplitude is adjusted to the same as before equalizing. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2006.07.28 Page 6 of 8 SA9614 TEST CIRCUIT TYPICAL APPLICATION CIRCUIT VCC 16 LD_ON 15 MICROCOMPUTER 14 RFRC 13 RFI 12 RFO 11 EQIN 10 VCC MON RFM GND VREF 1 RFC 100 /6.3V 2 LD 3 4 5 6 7 I_V I_V I_V HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn I_V VCC REV:1.0 8 RFG PD RFAC BST 9 100 1 /6.3V 500 2006.07.28 Page 7 of 8 SA9614 PACKAGE OUTLINE SOP-16-225-1.27 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2006.07.28 Page 8 of 8 5.720.25 6.00.4 3.90.3 |
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