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SA9616
RF AMPLIFIER FOR DIGITAL SERVO SYSTEM
DESCRIPTION
SA9616 can be used for (ALPC) and signal conversion between CD optical pickup head and decoding chip. This IC incorporates an interface to general CD optical pickup photodiode, RF signal amplifier and equalizer, VREF generation circuit and automatic optical power switching control (It is adaptive for CDA/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) * RF system equalizer * Automatic laser power control circuit(ALPC) * Operating voltage range (3V -7V), power consumption (150mW @5V)
SOP-20-300-1.27
ORDERING INFORMATION
Device SA9616 Package SOP-20-300-1.27
APPLICATIONS
* CD Players * VCD Players
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1
2002.07.11 Page 1 of 7
SA9616
ABSOLUTE MAXIMUM RATINGS (Tamb=25C)
Characteristics Supply Voltage Operating Temperature Operating Temperature Symbol VDD Tmax Pmax Rating -0.5 ~+9 -20 ~+75 500 Unit V C mW
DC ELECTRICAL CHARACTERISTICS
Characteristics Supply Voltage Current Consumption Bias Output Of Photoelectric Signal Symbol VDD IDD VREF VDD=5V VDD=5V Test Condition Min. 3.0 --Typ. 5.0 30 2.5 Max. 7.0 --Unit V mA V
AC ELECTRICAL CHARACTERISTICS (VDD=5V)
Characteristics Diode Control Input Photoelectric Input 1(A) Photoelectric Input 2(B) Photoelectric Input 3(C) Photoelectric Input 4(D) Symbol MON A B C D DA11 KSS213 DA11 KSS213 DA11 KSS213 DA11 KSS213 The resistor connected between RFM and RFO is Gain Of RF Signal GAIN 5.5K A, B, C, D are input pins, RFO is output pin RFG=VREF+1.0V Range Of VCA Gain VGA RFG=VREF-1.0V RFC=220K Input frequency 1.6MHz VFC=VREF, RFC=300K EQ Center Frequency 1 fC1 VFC=VREF, RFC=50K Input frequency 1.6MHz RFC=220K, VFC=VREF+1.0V EQ Center Frequency 2 fC2 RFC=220K, VFC=VREF-1.0V Input frequency 1.6MHz Boost Of EQ Center Frequency GFC RFC=220K, VFC=VREF Input frequency 1.6MHz -7.4 -6.1 dB 0.56 -1.5 MHz 0.85 -3.0 MHz -5.8 -7.2 dB 15.0 16.0 17.0 dB Test Conditions Min. -0 0 0 0 0 0 0 0 Typ. 0.13 --------Max. -0.60 0.15 0.60 0.15 0.60 0.15 0.60 0.15 Unit V V V V V V V V V
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.1
2002.07.11 Page 2 of 7
SA9616
PIN CONFIGURATION
PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol LD LD_ON RFAC A B C D VFC VCC EQ_IN BST RFG GND VREF RFC RFRC RFO RFM RFI MON APC circuit output pin. ALPC circuit ON/OFF switching pin. EQ output pin Photoelectric input 1 pin Photoelectric input 2 pin Photoelectric input 3 pin Photoelectric input 4 pin Equalizer center frequency adjust pin. Power supply pin. EQ input pin Equalizer for adjustment of boost level Input for setting the EQ gain Ground. Bias output pin of OEIC Input for setting the EQ center frequency Generating a detecting voltage for RF signal(external RC filter element) RF amplitude control output pin RF amplifier inverted output pin. RF amplifier gain is determined by the resistor connected between RFO pin and RFM pin. RF signal amplitude detecting input(coupling form RFO) Diode control input pin. Pin Description
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SA9616
FUNCTION DESCRIPTION
SA9616 incorporates RF amplifier, RF equalizer, RF amplitude detection circuit, automatic laser power control circuit, etc. RF AMPLIFIER
As shown in the block diagram, A, B, C, D are four photoelectric input pins. RFO is the output of the sum of the four input signal. RFM is the feedback input pin of the adder. RFO is realized by adding A and B (A+B), C and D (C+D) by the first adder, then getting the sum (A+B+C+D) by the second adder. The feedback equivalent resistors of A, B, C, D input amplifiers equal 58K, so the low frequency gain of the first adder is 58K/58K=1. The whole low frequency gain of the channel is determined by the gain of the second adder. Here, it is determined by the resistor connected between RFO pin and RFM pin. If the resistor equals 5.5K, the whole low frequency gain (single input loop): AV=R/2K=2.75. Frequency response is determined by the capacitor parallel with RFI pin. The designing -3dB bandwidth is 1.8MHz. RF AMPLITUDE DETECTION
RF amplitude detection input signal comes from the output pin RFO of RF amplifier. To enlarge the linear range of the amplitude detection, DC coupling input and AC coupling input has been used in this circuit. External RC filter connected to RFDC pin to determine the filtering time constants. And according to the RFO signal, a DC voltage correlate with the amplitude will generate in RFRC pin.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.1
2002.07.11 Page 4 of 7
SA9616
APC LOOP
Automatic power control circuit mainly insures the emission diode to generate constant power under different states (such as temperature). APC loop realizes the constant power by monitoring and controlling the receiving power of diode, thus to stabilize the input amplitude of RF signal. Add an automatic power control circuit in APC loop to adapt to the RF input signals of different disks. It is to adjust the output power by detecting the RF input signals and thus to adapt to various disks. The block diagram is shown above. MON is the monitor and control pin of power; LD is the driver output, which is connected to external PNP transistor. LD_ON is the enable pin of APC module which is high level active, and APC loop is working, or else the APC is in standby state. EQUALIZER CIRCUIT (Contains VCA and output)
EQ LOOP
EQ curve
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.1
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SA9616
Equalizer contains controllable gain amplifier VCA , equalize circuit and signal amplify output section .
RFG is the gain control port of VCA, and EQ_IN is the signal input port of VCA. When the potential of RFG is equal to VREF, the low frequency gain of VCA is 0dB; when the potential of RFG is equal to VREF+1V, the gain of VCA is +8 dB; when the potential of RFG is equal to VREF-1V, the gain of VCA is -8 dB. In actual application, you can adjust the output amplitude by adjusting the potential of RFG. The signal enters the equalizer after passing through the controllable gain amplifier. The primary parameter center frequency and boost gain can be set by RFC, VFC, 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. The center frequency also can be adjusted through changing the voltage of VFC. When the potential of VFC is equal to VREF, it does not affect the center frequency, and the center frequency is determined by the external resistor of RFC; When the potential of VFC is equal to VREF+1, the center frequency is 1.5 times of original one; When the potential of VFC is equal to VREF-1, the center frequency is 0.5 times of original one. Setting the voltage of BST can regulate the boost gain of center frequency. When the potential of BST is equal to VREF, the gain is set at +5dB; when the potential of BST is equal to VREF+1, the gain is set at +8dB; when the potential of BST is equal to VREF-1; the gain is set at -1dB. You will get the needed equalizer curve and satisfy the system design by adjusting RFC, VFC, and BST. The signal amplitude reduced after equalizing, so we need to add an amplifier to compensate the gain, increase the capability of drive 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.
TEST CIRCUIT
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.1
2002.07.11 Page 6 of 7
SA9616
TYPICAL APPLICATION CIRCUIT
VCC 0.01 VCC 20 11 19 18 17 16 15 5.5K 200K 33 14 13 12 11 VCC
SA9616
10 H LD 1 2 3 4 5 6 7 8 9 10 0.01 33 MICRO-COMPUTER SSP A B C D +5.0V
PACKAGE OUTLINE
SOP-20-300-1.27 UNIT: mm
0.150.05
1.27 12.700.25
0.45
2.25MAX
11.43
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1
2002.07.11 Page 7 of 7

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