SM5301AS 3-channel Video Buffer with Built-in Wideband Filters OVERVIEW The SM5301AS is a video buffer with built-in video signal bandwidth lowpass filter. The filter employs a 5order Butterworth lowpass filter configuration. The filter characteristics have been optimized for minimal overshoot and flat group delay, it has a variable cutoff frequency and guaranteed driver-stage channel gain difference and phase difference values. ■ ■ ■ ■ ■ ■ APPLICATIONS ■ ■ ■ ■ Set-top boxes Digital television DVD players Projector ORDERING INFORMATION Device Package SM5301AS 28-pin HSOP 1 28 NC GSG1 2 27 RINB/YINB GINB/UINB 3 26 GSR1 NC 4 25 RINA/YINA BINA/VINA 5 24 VCC4 GSB1 6 23 SYNCIN BINB/VINB 7 22 MUXSEL GND GND NC 8 21 VFC DISABLE 9 20 RFC GND3 10 19 GND4 BOUT/VOUT 11 18 VCC1 VCC3 12 17 ROUT/YOUT GND2 13 16 GND1 GOUT/UOUT 14 15 VCC2 PACKAGE DIMENSIONS (Unit: mm) + 0.1 0.15 – 0.0 5 0.5 ± 0.2 ■ GINA/UINA 1.3TYP 2.2 ± 0.1 ■ (Top view) 9.9 ± 0.3 ■ Supply voltage: 5V ± 10% VESA-standard ATSC digital TV RGB/YUV video filters 2-system input/1-system output switching analog multiplexer function DC voltage level restore sync clamp function Output buffer gain switching function: 0, 6dB (input-to-output AC signal gain) Channel-to-channel gain difference: 0.5dB (± 5% supply voltage variation) Channel-to-channel phase difference: 3.5 degree Output signal harmonic distortion (all channels): 1.5% Cutoff frequency: 5.8 to 37MHz variable Package: 28-pin HSOP (Pb free) 18.6 ± 0.3 0.8 5.15 0.10 0.35 ± 0.05 0.12 M 0 to 10 0.1 ± 0.05 ■ PINOUT 7.5 ± 0.2 FEATURES NIPPON PRECISION CIRCUITS INC.—1 SM5301AS BLOCK DIAGRAM VCC1 VCC2 VCC3 VCC4 DISABLE Buffer RINA/YINA MUX LPF ROUT/YOUT RINB/YINB GSR1 DC Restore Buffer GINA/UINA MUX LPF GOUT/UOUT GINB/UINB GSG1 DC Restore Buffer BINA/VINA MUX LPF BOUT/VOUT BINB/VINB GSB1 DC Restore MUXSEL SYNCIN IFC Control GND1 GND2 GND3 GND4 RFC VFC NIPPON PRECISION CIRCUITS INC.—2 SM5301AS PIN DESCRIPTION Number Name I/O Description 1 GINA/UINA I Analog GINA or UINA signal input. Sync signal is input on SYNCIN pin. 2 GSG1 I GOUT/UOUT output buffer gain set input 3 GINB/UINB I Analog GINB or UINB signal input. Sync signal is input on SYNCIN pin. 4 NC – No connection (leave open or connect to ground) 5 BINA/VINA I Analog BINA or VINA signal input. Sync signal is input on SYNCIN pin. 6 GSB1 I BOUT/VOUT output buffer gain set input 7 BINB/VINB I Analog BINB or VINB signal input. Sync signal is input on SYNCIN pin. 8 NC – No connection (leave open or connect to ground) 9 DISABLE I Power save function. Built-in pull-down resistor. L: Enable H: Disable (Output pins: ROUT/YOUT, GOUT/UOUT, and BOUT/VOUT are high impedance.) 10 GND3 − Analog ground 11 BOUT/VOUT O B/V signal output 12 VCC3 − Analog 5V supply 13 GND2 − Analog ground 14 GOUT/UOUT O G/U signal output 15 VCC2 − Analog 5V supply 16 GND1 − Analog ground 17 ROUT/YOUT O R/Y signal output 18 VCC1 − Analog 5V supply 19 GND4 − Analog ground 20 RFC − LPF (lowpass filter) cutoff frequency setting resistor connection 21 VFC I LPF (lowpass filter) cutoff frequency setting voltage input 22 MUXSEL I Input select signal. Built-in pull-down resistor. L: ×INA pin select H: ×INB pin select 23 SYNCIN I Filter channel external H-Sync signal input. Active “H”. Built-in pull-down resistor. 24 VCC4 − Analog 5V supply 25 RINA/YINA I Analog RINA or YINA signal input. Sync signal is input on SYNCIN pin. 26 GSR1 I ROUT/YOUT output buffer gain set input 27 RINB/YINB I Analog RINB or YINB signal input. Sync signal is input on SYNCIN pin. 28 NC – No connection (leave open or connect to ground) NIPPON PRECISION CIRCUITS INC.—3 SM5301AS SPECIFICATIONS Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage range VCC − 0.3 to 7.0 V Storage temperature range Tstg − 55 to + 125 °C Power dissipation 11 PD1 1.0 W Power dissipation 22 PD2 0.9 W 1. When mounted on a substrate: mounted on a 111 × 80 × 1.6mm glass-epoxy substrate with 90% copper (Cu) wiring factor, 0m/s air flow, and Ta = – 25 to 70 °C. 2. When mounted on a substrate: mounted on a 111 × 80 × 1.6mm glass-epoxy substrate with 90% copper (Cu) wiring factor, 0m/s air flow, and Ta = 70 to 80 °C. Recommended Operating Conditions Parameter Supply voltage ranges Operating temperature range Symbol Rating Unit VCC 4.5 to 5.5 V Ta – 25 to 85 °C Electrical Characteristics VCC = 4.5 to 5.5V, Ta = – 25 to 85°C unless otherwise noted. Rating Parameter Symbol Condition min typ max Unit Test level Supply current 1 ICC1 VCC = 5.5V, RFC = 820Ω to GND, VFC = 0.2V (fc = 5MHz), DISABLE = "L" 70 100 130 mA I Supply current 2 ICC2 VCC = 5.5V, RFC = 820Ω to GND, VFC = 1.6V (fc = 40MHz), DISABLE = "L" 90 120 160 mA I Supply current 3 ICC3 VCC = 5.5V, RFC = 820Ω to GND, VFC = 0.2V (fc = 40MHz), DISABLE = "H" 1 2.5 5 mA I Output gain error 1 ∆AV1 Error entered around table 1 values, Ta = 0 to 70°C, VCC = 4.75 to 5.25V – 0.5 – + 0.5 dB I Output gain error 2 ∆AV2 Error entered around table 1 values, Ta = – 25 to 85°C –1 – +1 dB I Output voltage Vout2 RL = 75Ω to GND, 6dB gain setting 2.4 – – Vp-p I DISABLE-mode input impedance (pull-down) RIN1 RINA/YINA, RINB/YINB, GINA/UINA, GINB/UINB, BINA/VINA, BINB/VINB – 50 – kΩ I Time for 90% output signal change for 10mV input signal, CIN = 0.1µF – 8 – ms II AC coupling, 6dB gain setting – – 1.4 Vp-p I Clamp response time Maximum input amplitude Tclamp VI Maximum overshoot VOS 2Vp-p output pulse – 10 – % II Maximum load capacitance CL BOUT/VOUT, GOUT/UOUT, ROUT/YOUT – – 15 pF II Output drive load RL one load unit = 150Ω – – 2 load I Channel-to-channel gain difference dG Between R/G/B, fc/2 [Hz] – – 0.5 dB I NIPPON PRECISION CIRCUITS INC.—4 SM5301AS Rating Parameter Symbol Condition min typ max Unit Test level Channel-to-channel phase difference dφ Between R/G/B, fc/2 [Hz] – 3.5 – degree II Output harmonic distortion THD Vout = 2Vp-p, f = 1MHz – 1.5 – % II Power supply rejection ratio PSRR VCC = 0.5Vp-p, f = 100kHz – 35 – dB II Output short-circuit current ISC – – 100 mA II Logic HIGH-level input voltage 1 VIH1 DISABLE, MUXSEL, SYNCIN 2.5 – – V I Logic LOW-level input voltage 1 VIL1 DISABLE, MUXSEL, SYNCIN – – 1.0 V I Logic HIGH-level input voltage 2 VIH2 GSB1, GSG1, GSR1 VCC − 0.5 – – V I Logic LOW-level input voltage 2 VIL2 GSB1, GSG1, GSR1 – – 0.5 V I Logic pull-up resistance RIN2 GSB1, GSG1, GSR1 – 40 – kΩ I Logic pull-down resistance RIN3 DISABLE, MUXSEL, SYNCIN – 50 – kΩ I Unit Test level Filter Characteristics VCC = 4.5 to 5.5V, Ta = – 25 to 85°C unless otherwise noted. Rating Parameter Cutoff frequency adjustment range Symbol Condition min typ max FC Ta=25°C (see figure 1) 5.8 – 37 MHz I Cutoff frequency error ∆FC Ta = 25°C, VCC = 5.0V – – ± 20 % I 4fc attenuation fSB fIN ≥ 4fc – 50 – dB II Output noise characteristic VNOISE 10kHz to 40MHz, 6dB output gain setting – 1.0 – mVRMS II Crosstalk XTALK Between 2 channels with input 0.5Vp-p 1MHz – − 47 – dB II Multiplexer crosstalk XTALK Between MUX A−B – − 49 – dB II TPD Each input = 500kHz – 10 – ns II to 3.58MHz – 9 – ns II to 4.43MHz – 15 – ns II to 3.58MHz – 1 – ns II to 4.43MHz – 1 – ns II to 10MHz – 2 – ns II to 10MHz – 0.5 – ns II to 30MHz – 5 – ns II 0.2 – 1.6 V I Channel-to-channel group delay Group delay variation ∆TPD1 Fc = 6.7MHz (500kHz) ∆TPD2 Fc = 24MHz (500kHz) ∆TPD3 VFC input voltage range Fc = 36MHz (1MHz) VFC Test level I : 100% of products tested at Ta = + 25°C. II : Guaranteed as result of design and characteristics evaluation. NIPPON PRECISION CIRCUITS INC.—5 SM5301AS Table 1. Output buffer gain control GS×1 Gain [dB] GND 0 VCC or Open 6 45 40 35 fc [MHz] 30 25 20 15 10 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 VFC [V] RFC: 820Ω to GND Figure 1. VFC vs. cutoff frequency NIPPON PRECISION CIRCUITS INC.—6 SM5301AS 2.00E+01 6dB 0.00E+00 Gain [dB] 0dB –2.00E+01 –4.00E+01 –6.00E+01 –8.00E+01 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency [Hz] Figure 2. Frequency response (VFC = 0.2V) 2.00E+01 6dB Gain [dB] 0.00E+00 0dB –2.00E+01 –4.00E+01 –6.00E+01 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency [Hz] Figure 3. Frequency response (VFC = 1.0V) 2.00E+01 6dB Gain [dB] 0.00E+00 0dB -2.00E+01 -4.00E+01 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency [Hz] Figure 4. Frequency response (VFC = 1.6V) NIPPON PRECISION CIRCUITS INC.—7 SM5301AS Adjusting the Cutoff Frequency Constant-voltage control 1 Cutoff frequency control using a reference voltage VR generated by voltage divider formed by R1 and R2. VR R1 VFC R2 RFC Constant-voltage control 2 Cutoff frequency control by adjusting the resistance connected to RFC. VFC VR RFC PWM control Cutoff frequency control by smoothing the PWM signal, using R1 and C1, input to VFC. PWM R1 VFC C1 RFC When VFC = 0.2V VDD = 3.3V, 6% duty drive VDD = 5.0V, 4% duty drive When VFC = 1.6V VDD = 3.3V, 48% duty drive VDD = 5.0V, 32% duty drive Note: The resistor connected to RFC can affect the cutoff frequency response, so a high-precision component should be used. It is recommended to set the RC filter cutoff frequency to < fc/100 of the PWM waveform frequency. NIPPON PRECISION CIRCUITS INC.—8 SM5301AS Resistor switch control The VFC voltage can be controlled using multi-logic voltage levels switching inputs to a voltage divider resistor network. V1 V2 V3 R1 VFC R2 R3 RFC R0 The VFC voltage is determined by the logic voltage (V1, V2, V3) and the corresponding voltage divider resistor network. NIPPON PRECISION CIRCUITS INC.—9 SM5301AS TYPICAL APPLICATION CIRCUITS 820Ω ATSC Digital TV Application +5V + Cut-off control voltage SYNC (*3) + RIN/YIN 220µF 1.0µF GSR1 (*2) R/Y 75Ω (*2) (*4) GIN/UIN ROUT/YOUT GND1 VCC2 VCC3 GND2 GOUT/UOUT VCC1 BOUT/VOUT RFC GND4 DISABLE GND3 VFC NC MUXSEL BINB/VINB SYNCIN VCC4 (*1) 1.0µF GSB1 BINA/VINA RINA/YINA NC RINB/YINB GSR1 GINB/UINB GSG1 GINA/UINA NC (*1) + (*1) 220µF GSG1 (*4) G/U 75Ω (*2) (*2) + BIN/VIN 220µF B/V 75Ω 1.0µF GSB1 (*4) DISABLE (*1) Pins without an input signal, set by NUXSEL, should be left open or tied to GND. (*2) Connect 4 × 0.1µF capacitor between the supply pins close to the IC. (*3) Connect a 47µF capacitor between the supply pins close to the IC. (*4) GS×1 are 3-level pins. Connect a capacitor if an error occurs due to external noise. Also, if open-circuit, the internal impedance and external capacitance (C) form an RC network. When power is applied, the open-circuit potential rises with time constant τ = C × 10k (sec). (*5) Printed circuit board supply wiring ■ ■ ■ If the supply is used for other digital circuits, there is a possibility that noise will be introduced. Accordingly, these circuits should be connected to the application’s analog supply. Ground-plane wiring should be performed, as much as possible, to provide low GND line impedance. If ground-plane wiring up to the GND pins is difficult, the ground plane should be as close to the IC as possible with a separate wire to each GND pin. Input Capacitor and Cutoff Frequency The capacitor connected to pins RINA/YINA, RINB/YINB, GINA/UINB, GINB/UINB, BINA/VINA, and BINB/VINB forms a highpass filter (HPF) with the internal impedance. The HPF cutoff frequency is given by the following equation. fc = 1 2πCR (C: input capacitance, R: signal input impedance = 9.3kΩ) NIPPON PRECISION CIRCUITS INC.—10 SM5301AS 2-load Output Connection ROUT/YOUT output 2-load connection (similarly for GOUT/UOUT , BOUT/VOUT outputs) 220µF ROUT/YOUT 75Ω + R/Y1 75Ω R/Y2 Digital TV Receiver and HDTV Decoder Box Graphic Processor MPEG2 Transport/Decoder CAMERA HDTV Decoder/Display Processor D to A Convertor SM5301 DIGITAL TV Video Decoder and Display Processor D to A Convertor SM5301 RGB MONITOR DVD-ROM MEMORY Graphic Processor NIPPON PRECISION CIRCUITS INC.—11 SM5301AS Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from NIPPON PRECISION CIRCUITS INC. (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome, Koto-ku, Tokyo 135-8430, Japan Telephone: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: [email protected] NC0202BE 2003.05 NIPPON PRECISION CIRCUITS INC.—12