BL1516 Triple, 35MHz, 6th Order, HDTV Video Filter Driver BL1516 Description The BL1516 is a video buffer which integrates triple 6dB Gain rail-to-rail output driver and triple 6th order output reconstruction filter, and it owns 35MHz -3dB bandwidth. Compared with passive LC filters and discrete drivers, BL1516 can improve image quality. And it is ideally suited for battery powered applications, because the BL1516 can operate under the environment with single supplies ranging from +3.3V to +5.5V and sinking an ultra-low 36mA quiescent current. Video signal, such as the output of DAC, can be input in the BL1516 by DC-coupled or AC-coupled ways. Internal diode clamps and bias circuitry may be used if AC-coupled inputs are required. BL1516 also integrates an internal level shift circuit which avoids sync-pulse being clipped and allows DCcoupled output. The driver in BL1516 can drive DC or AC-coupled single (150Ω) or dual (75 Ω) loads. Features Triple 6th Order 35MHz (HD) Filters Transparent Input Clamping 6dB Output Driver Gain and Drive Dual Video Load Rail-to-Rail Output Input Voltage Range Includes Ground AC or DC Coupled Inputs / Outputs Operates from 3.3V to 5.5V Single Power Supply Low Power 36mA Total Supply Current Green SOP8 Package Applications Cable and Satellite Set-Top Boxes Video Amplifiers Communications Devices Personal Video Recorders Video on Demand, DVD Players, HDTV, Projectors http://www.belling.com.cn -1- Total 7 Pages BL1516 Pin Configuration IN1 1 8 OUT1 IN2 2 7 OUT2 IN3 3 6 OUT3 VDD 4 5 GND SOP8L Block Diagram IN1 IN2 IN3 Transparent Clamp 35MHz,6th order Transparent Clamp 35MHz,6th order Transparent Clamp 35MHz,6th order 6dB OUT1 6dB OUT2 6dB OUT3 Pin Description No. 1 2 3 4 5 6 7 8 http://www.belling.com.cn Pin Name IN1 IN2 IN3 VDD GND OUT3 OUT2 OUT1 Description Signal Input, channel 1 Signal Input, channel 2 Signal Input, channel 3 The power pad of the chip The ground pad of the chip Signal Output, channel 3 Signal Output, channel 2 Signal Output, channel 1 -2- I/O Input Input Input Power Ground Output Output Output Total 7 Pages BL1516 ABSOLUTE MAXIMUM RATINGS Parameter Min Max Units Supply Voltage V+ to V- -0.3 6 V Input Voltage GND-0.3 (+Vs)+ 0.3 V Storage Temperature Range -65 150 ℃ Work Temperature Range -40 85 ℃ -40 85 ℃ Operating Temperature Range TA Notes: Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ORDERING INFORMATION MODEL PIN- PACKAGE BL1516 SOP8 http://www.belling.com.cn SPECIFIED TEMPERATURE RANGE - 40°C to +85°C -3- PACKAGE OPTION Tape and Reel, 2500 Total 7 Pages BL1516 ELECTRICAL CHARACTERISTICS (At Vs=5V, RL = 150Ω connected to GND, VIN = 1Vpp, and CIN = 0.1µF, all outputs AC coupled with 220µF, unless otherwise noted) DC ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS Iq VIN=0V VOLS VIN=0V, NO LOAD Input Voltage Vclamp (Vclamp) IIN=-3.5mA TEMP MIN TYP MAX UNITS +25℃ -40 to +85℃ +25℃ -40 to +85℃ +25℃ 36 48 550 62 638 785 -180 -105 mA mV mV -40 to +85℃ -261 Clamp Charge Current VIN=Vclamp-100mV PSRR DC Output Voltage High Swing VIN=3V, RL = 150Ω connected to GND +25℃ -6 -40 to +85℃ -6.6 +25℃ 48 -40 to +85℃ 43 +25℃ -40 to +85℃ -5.1 mA 60 dB 4.73 4.85 V 4.71 AC ELECTRICAL CHARACTERISTICS PARAMETER GAIN (AV) CONDITIONS TEMP MIN TYP MAX UNITS +25℃ 5.89 6 6.36 RL = 150Ω to GND dB -40 to +85℃ 5.56 6.52 BW (-0.1dB) RL = 150Ω to GND +25℃ 30 MHz BW (-3dB) RL = 150Ω to GND +25℃ 35 MHz Filter response fIN=74.25MHz +25℃ -45 dB D/DT difference from 400KHz to 20MHz +25℃ 4 nS CROSSTALK At 1MHz +25℃ 70 dB http://www.belling.com.cn -4- Total 7 Pages BL1516 Typical Application Diagram The following schematic in Figure 1 is normally used for AC coupled output and DCcoupled input with DAC which has an output voltage range of 0V to 1.4V. AC coupled output offer slightly lower power dissipation and high ESD protection ability. Figure 2 is Is a kind of special application in STB . input clamp 1 IN1 R/Pr filter 220μF OUT1 8 R/Pr 75Ω 75Ω input clamp 2 IN2 G/Y filter OUT2 220μF 7 G/Y 75Ω 75Ω input clamp 3 IN3 filter B/Pb 220μF OUT3 6 B/Pb 75Ω 75Ω BL1516 4 +5V 10μF +Vs GND 5 0.1μF or 0.01μF Figure 1 Input DC Coupling and Output AC Coupling Application Schematic 220μF to loading1 input clamp Y 1 75Ω IN1 filter 220μF 8 OUT1 A to loading2 75Ω 75Ω 220μF to loading1 input clamp SOC Of STB Pb 2 75Ω IN2 filter to loading2 75Ω B 75Ω 220μF 7 OUT2 220μF to loading1 input clamp Pr 3 75Ω IN3 filter OUT3 220μF 6 C to loading2 75Ω 75Ω BL1516 4 +Vs GND 5 Vcc 10μF 0.1μF or 0.01μF Figure 2 A kind of special application in STB http://www.belling.com.cn -5- Total 7 Pages BL1516 APPLICATION NOTE Functional Description BL1516 operates from a single 3.3V to +5.5V supply. In application, BL1516 is a fully integrated solution for filtering and buffering HDTV signals in front of video decoder or behind video encoder. For example, BL1516 can replace three passive LC filter and one amplifier driver at R\G\B and Y\Pb\Pr output side in set-top box and DVD player, this solution can help you save PCB size and production cost, it also improves video signal performance comparing with traditional design using discrete components. BL1516 features a DC-coupled input buffer, 6-pole low-pass filter to eliminate out-of-band noise of video encoder, and a gain of +6dB in the output amplifier to drive 75Ω load. The AC or DC-coupled input buffer eliminates sync crush, droop, and field tilt. The output of BL1516 also can be DC-coupled or AC-coupled. Input Considerations Besides AC coupling, the BL1516 inputs also can be DC-coupled. In DC coupling application, No input coupling capacitors are needed because the amplitude of input video signal from DAC includes ground and extends up to 1.4V, then BL1516 can be directly connected to the output of a single-supply, currentoutput DAC without any external bias network. Some time, if DAC’s output level exceeds the range of 0V to 1.4V, or BL1516 is driven by an unknown external source or a SCART switch which has its own clamping circuit, AC coupling is needed in such applications. Output Considerations The BL1516 outputs can be DC-coupled or AC-coupled. When 0V is input, the BL1516 output voltage is 550mV typically. In DC coupling design, one 75Ω resistor is used to connect BL1516’s output pin with external load directly, this serial back-termination resistor is used to match the impedance of the transmission line between BL1516 and external load to cancel the signal reflection. The BL1516 outputs can sink and source current allowing the device to be AC-coupled with external load, in AC coupling, 220µF at least capacitor will be used in order to eliminate field tilt. Power-Supply Bypassing and Layout Correct power supply bypassing is very important for optimizing video performance in design. One 0.1µF and one 10µF capacitors are always used to Bypass VCC pin of BL1516, please place these two capacitors as close to the BL1516 output pin as possible, a large ground plane is also needed to ensure optimum performance. The input and output termination resistors should be placed as close to the related pin of BL1516 as possible to avoid performance degradation. The PCB traces at the output side should have 75Ω characteristic impedance in order to match the 75Ω characteristic impedance cable connecting external load. In design, please keep the board trace at the inputs and outputs of the BL1516 as short as possible to minimize the parasitic stray capacitance and noise pickup. http://www.belling.com.cn -6- Total 7 Pages BL1516 PACKAGE OUTLINE DIMENSIONS (SOP8) SOP8L SYMBOL MILLIMETER http://www.belling.com.cn MILLIMETER MIN. NOM MAX. A A1 A2 A3 b b1 c c1 D E E1 e h L L1 0.10 1.30 0.60 0.39 0.38 0.21 0.19 4.70 5.80 3.70 1.27BSC 0.25 0.50 1.05BSC 1.40 0.65 0.41 0.20 4.90 6.00 3.90 1.75 0.23 1.50 0.70 0.48 0.44 0.26 0.21 5.10 6.20 4.10 1.27BSC 0.50 0.80 1.05BSC θ 0° -7- - 8° Total 7 Pages