SM5304AV Video Buffer with Built-in Analog LPF OVERVIEW The SM5304AV is a 75Ω terminating resistance drive video buffer with built-in analog filter. The filter cutoff frequency, controlled by the resistance connected to RFC pin, can be set to match any system resolution. The output buffer can be selected 0dB, 6dB, and 12dB. The feedback point occurs after the external coupling capacitors, and the coupling capacitances can be reduced. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ PINOUT 5V ± 10% supply voltage Adjustable cutoff frequency using external resistor 0dB, 6dB, 12dB selectable gain using logic signal ± 0.5dB output gain error Two systems (two load resistances) can be driven 0.7% output signal harmonic distortion Sag compensation circuit built-in Package: 8-pin VSOP (Pb free) (Top view) VIN 8 1 VF ENABLE VOUT RFC APPLICATIONS ■ ■ ■ VCC GSEL 5 4 GND DVD Digital still camera Digital VHS ORDERING INFORMATION PACKAGE DIMENSIONS (Unit: mm) Weight: 0.04g 0 to 10 0.5 ± 0.2 6.4 ± 0.3 8-pin VSOP 4.4 ± 0.2 SM5304AV 0.575typ + 0.1 5 0.0 0.15 − 3.1 ± 0.3 1.15 ± 0.05 Package 0.65 0.10 0.1 ± 0.05 Device 0.22 ± 0.1 0.12 M SEIKO NPC CORPORATION —1 SM5304AV BLOCK DIAGRAM VCC ENABLE GSEL 8th order LPF VIN Buffer VOUT Clamp RFC VF GND PIN DESCRIPTION Number Name I/O1 A/D2 1 VIN I A Input signal pin 2 ENABLE I D Enable signal input pin (with pull-down resistor) 3 RFC O A LPF cutoff frequency set pin 4 VCC – – 5V supply pin 5 GND – – Ground pin 6 VOUT O A Output signal pin 7 VF I A Output signal feedback pin for sag compensation circuit 8 GSEL I D Gain set signal input pin Description 1. I: input, O: output 2. A: analog, D: digital SEIKO NPC CORPORATION —2 SM5304AV SPECIFICATIONS Absolute Maximum Ratings Parameter Symbol Condition Rating Unit Supply voltage range VCC − 0.3 to 7 V Storage temperature range TSTG − 55 to + 125 °C 300 mW 125 °C Power dissipation PD Junction temperature Tj θja = 214°C/W (Note 1) (Note 1) Tj is calculated by Tj = PD × θja + Ta (PD: Power dissipation (= VCC × ICC), θja: Thermal resistance, Ta: Ambient temperature). θja is measured value in the mounting condition which NPC specified. (glass epoxy board, board size: 40mm × 40mm, wiring density: 10%, still air) Recommended Operating Conditions Parameter Symbol Supply voltage range Operating temperature range Condition Rating Unit VCC 4.5 to 5.5 V Ta – 40 to 85 °C Digital Characteristics VCC = 5.0V, Ta = 25°C, unless otherwise noted. Rating Parameter Symbol Condition min typ max Unit Test level HIGH-level input voltage 1 VIH1 ENABLE pin 2.4 – – V I LOW-level input voltage 1 VIL1 ENABLE pin – – 0.8 V I HIGH-level input voltage 2 VIH2 GSEL pin VCC – 0.5 – – V I LOW-level input voltage 2 VIL2 GSEL pin – – 0.5 V I Open-circuit input voltage VOPEN GSEL pin VCC/2 – 0.5 – VCC/2 + 0.5 V I HIGH-level input current 1 IIH1 ENABLE pin, VIN = VCC – 100 200 µA I Input leakage current 1 ILL1 ENABLE pin, VIN = 0V – – 1 µA I Input leakage current 2 ILL2 GSEL pin, ENABLE = “LOW”, VIN = 0V – – 1 µA I HIGH-level input current 2 IIH2 GSEL pin, ENABLE = “HIGH”, VIN = VCC – 250 400 µA I LOW-level input current 2 IIL2 GSEL pin, ENABLE = “HIGH”, VIN = 0V – 250 400 µA I Pull-down resistance 1 RPD1 ENABLE pin 40 50 60 kΩ I Pull-down resistance 2 RPD2 GSEL pin when ENABLE = “LOW” 16 20 24 kΩ I SEIKO NPC CORPORATION —3 SM5304AV Electrical Characteristics VCC = 5.0V, Ta = 25°C, unless otherwise noted, See Measurement circuit. Rating Unit Test level 52 mA II 39 49 mA II – – 10 µA I 5.7 6.2 6.7 dB I GSEL = “Open cct”, RFC = 4.3kΩ, f = 1MHz – 0.3 0.2 0.7 dB I AV3 GSEL = “HIGH”, RFC = 4.3kΩ, f = 1MHz 11.5 12.0 12.5 dB I Input voltage range VIN AC-coupled input, f = 100kHz 1.4 – – Vp-p I Maximum output voltage Vout Output conditions shown in Typical Connection 2.4 – – Vp-p I Parameter Symbol Condition Current consumption 1 ICC1 Current consumption 2 min typ max VCC = 4.5 to 5.5V, RFC = 2.7kΩ, Ta = – 40 to 85°C, ENABLE = “HIGH” – 41 ICC2 VCC = 4.5 to 5.5V, RFC = 4.3kΩ, Ta = – 40 to 85°C, ENABLE = “HIGH” – Current consumption 3 ICC3 ENABLE = “LOW”, GSEL = “LOW” Signal gain 1 AV1 GSEL = “LOW”, RFC = 4.3kΩ, f = 1MHz Signal gain 2 AV2 Signal gain 3 Clamp voltage VCLMP 0.9 1.2 1.45 V I Overshoot/ Undershoot1 VOS – 4.0 – % III Output harmonic distortion THD Cutoff frequency control range ) value range2 f = 1MHz, Vout = 2Vp-p, RFC = 4.3kΩ – 0.7 – % III fC 2 – 10 MHz I RFC 2.7 – 18 kΩ I Cutoff frequency error ∆FC – – ± 15 % I 4fc attenuation fSB f ≥ 4fc – – 70 – dB III RFC = 4.3kΩ, 100kHz and 5MHz group delay difference – 12 – ns III Resistor (RFC ∆TPD Group delay variation 1. The percentage output pulse overshoot when RFC = 4.3kΩ, gain = 6dB, and input pulse = 1Vp-p (rise and fall times = 100ns). 2. Refer to “RFC Frequency Control” for the Cutoff frequency vs. RFC characteristics. Test level I : Valid for 100% product tests conducted at Ta = 25°C II : 100% valid for alternative tests conducted at Ta = 25°C III : Guaranteed based on design and characteristics evaluation Measurement circuit 4.7µF VCC + VIN VCC GSEL 22µF Output + ENABLE RFC VF RFC VOUT VCC GND 75Ω 75Ω + Input 100µF 75Ω 75Ω VCC SEIKO NPC CORPORATION —4 SM5304AV FUNCTIONAL DESCRIPTION RFC Frequency Control Characteristics The cutoff frequency (fc) is controlled by the resistor connected to RFC pin (RFC). The characteristics about fc versus RFC is shown in table 1. Table 1. RFC and frequency control range RFC [kΩ] Cutoff frequency [MHz] 18 1.9 15 2.3 12 2.8 10 3.3 8.2 3.9 6.8 4.6 5.6 5.5 4.7 6.4 4.3 6.9 3.9 7.5 3.3 8.7 2.7 10.5 Adjustment methods It can set up by the following methods. Since resistance affects cutoff frequency, please use a high precise thing. ■ Fixed resistor The frequency can be adjusted using an external resistor connected to RFC. RFC SEIKO NPC CORPORATION —5 SM5304AV ■ Variable resistor The frequency can be adjusted using a preset variable resistor VR connected to RFC. RFC ■ Voltage control The frequency can be adjusted by voltage control of the resistor connected to RFC using a DC voltage supply (for example, using a DAC). In this case, the adjusting voltage must be controlled such that it does not exceed the RFC pin voltage (1.5V typ). RFC ■ Resistor switch control The frequency can be adjusted by switching the resistance connected to RFC using logic voltage control. RFC SW Control SEIKO NPC CORPORATION —6 SM5304AV Gain Control Function and Enable Function ENABLE pin HIGH (Enable) GSEL pin Gain setting LOW 6dB Open 0dB HIGH 12dB LOW LOW (Disable) Open High impedance output HIGH When setting GSEL pin to open, in order to prevent incorrect operation by the external noise, it recommends connecting a capacitor between GSEL pin and GND pin. Equivalent circuit The equivalent circuit of GSEL pin and ENABLE pin is shown in figure. GSEL pin is connected only to pulldown resistor in the state of disable. ENABLE GSEL 3-level decoder SEIKO NPC CORPORATION —7 SM5304AV TYPICAL CHARACTERISTICS VCC = 5.0V, RFC = 4.3kΩ, Ta = 25°C, unless otherwise noted. 12 0 0 150n 6dB Gain Gain −6 0 130n −12 110n Phase −180 −18 −270 −24 −30 −24 90n Group Delay −360 −36 −450 −42 −540 −48 0.1 1 10 Frequency [MHz] 100 −36 −48 Group Delay [s] −12 Gain [dB] −90 Phase [deg] 70n 50n 0.1 Figure 1. Phase vs Frequency 1 10 Frequency [MHz] 100 Figure 2. Group Delay vs Frequency 6 18 0dB 12 12dB 0 6 Gain [dB] 6dB 0 0dB −6 −12 −6 −12 Rfc=10kΩ −18 −24 Rfc=4.3kΩ Rfc=18kΩ 0.1 1 10 Frequency [MHz] −18 100 Figure 3. Gain vs Frequency (Rfc = 4.3kΩ) 0.1 1 Rfc=2.7kΩ 10 Frequency [MHz] 18 6dB 12dB 6 Gain [dB] 12 0 −6 Rfc=10kΩ Rfc=18kΩ −12 100 Figure 4. Gain vs Frequency (0dB) 12 Gain [dB] Gain [dB] Gain [dB] 12 90 6dB 6 0.1 1 6 0 Rfc=4.3kΩ Rfc=10kΩ Rfc=2.7kΩ 10 Frequency [MHz] Figure 5. Gain vs Frequency (6dB) 100 Rfc=4.3kΩ Rfc=18kΩ −6 0.1 1 Rfc=2.7kΩ 10 100 Frequency [MHz] Figure 6. Gain vs Frequency (12dB) SEIKO NPC CORPORATION —8 SM5304AV 12 14 10 12 Rfc=2.7kΩ 10 fc [MHz] fc [MHz] 8 6 4 8 6 Rfc=4.3kΩ 4 Rfc=10kΩ 2 2 0 0 Rfc=18kΩ 1 10 Rfc [kΩ] 100 −50 0 50 100 Ta [°C] Figure 7. fc vs Rfc Figure 8. fc vs Ta 50 45 47.5 43 45 ICC [mA] ICC [mA] Rfc=2.7kΩ 42.5 40 VCC=5.5V 37.5 41 Rfc=4.3kΩ 39 VCC=5.0V 35 37 VCC=4.5V 32.5 35 −50 30 1 10 Rfc [kΩ] 100 0 50 100 Ta [°C] Figure 9. ICC vs Rfc Figure 10. ICC vs Ta 15 45 Rfc=2.7kΩ 12 12dB 43 Gain [dB] ICC [mA] 9 Rfc=4.3kΩ 41 39 6dB 6 3 37 0dB 0 35 4 4.5 5 VCC [V] Figure 11. ICC vs VCC 5.5 6 −3 0.2 0.4 0.6 0.8 1 1.2 VIN [Vp-p] 1.4 1.6 1.8 Figure 12. Gain vs VIN SEIKO NPC CORPORATION —9 SM5304AV 15 15 12 12 12dB (VIN=0.6Vp-p) 12dB (VIN=0.6Vp-p) 9 Gain [dB] Gain [dB] 9 6 6dB (VIN=1.2Vp-p) 3 6 6dB (VIN=1.2Vp-p) 3 0 0 0dB (VIN=1.4Vp-p) −3 4 4.5 5 VCC [V] 5.5 0dB (VIN=1.4Vp-p) −3 6 −50 −25 Figure 13. Gain vs VCC 0 25 Ta [°C] 50 75 100 Figure 14. Gain vs Ta 4 Input signal frequency=1MHz Vmaxout [Vp-p] 3.75 3.5 3.25 3 2.75 2.5 4 4.5 5 VCC [V] 5.5 6 Figure 15. Vmaxout vs VCC TYPICAL CONNECTION 10µF 5V VCC + 0.1µF GSEL ENABLE Input 8th order LPF + 4.7µF VIN 100µF + Buffer 75Ω Output VOUT 75Ω Clamp RFC 22µF + VF RFC 75Ω Output GND 75Ω SEIKO NPC CORPORATION —10 SM5304AV NOTES ON USE Capacitors Between Power Supply Pin Please be sure to connect a capacitor between power supply pin (VCC, GND) for preventing the oscillation of an output and supplying a power supply stable. Electrolytic capacitor about 1µF to 10µF and ceramic capacitor about 0.01µF to 0.1µF are recommended. Please connect a ceramic capacitor to near between power supply pin, shown in a figure. VCC GND Range of Power Dissipation and Ambient Temperature Operating condition range (power supply and ambient temperature) which is not exceeded package power dissipation and package junction temperature shown in the item of Absolute Maximum Rating are shown in a figure. However this range is calculated from the package thermal resistance under the mounting conditions which NPC specified, and when mounting conditions differ from this condition, it does not become such. PD = ( Tjmax − Ta ) / θja Tjmax = 125 C, θja = 214 C/W Power Dissipation [mW] 300 187 0 −40 60.8 85 Ta [ C] Mounting conditions • • • • glass epoxy board board size: 40mm × 40mm wiring density: 10% still air The following method is effective, in order to lower thermal resistance and to prevent the rise of junction temperature. • Wiring area connected to the pin of SM5304AV is made widely. • To cool down, use the cooling fan etc. SEIKO NPC CORPORATION —11 SM5304AV 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 SEIKO NPC CORPORATION (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. SEIKO NPC CORPORATION 15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: [email protected] NC0118BE 2006.04 SEIKO NPC CORPORATION —12