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| SM5304AV Video Buffer with Built-in Analog LPF OVERVIEW The SM5304AV is a 75 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 I I I I I I I I PINOUT (Top view) 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) VIN ENABLE RFC 1 8 GSEL VF VOUT APPLICATIONS I I I VCC 4 5 GND DVD Digital still camera Digital VHS ORDERING INFORMATION PACKAGE DIMENSIONS Device SM5304AV Package 8-pin VSOP (Unit: mm) Weight: 0.04g 0 to 10 4.4 0.2 6.4 0.3 0.575typ 3.1 0.3 1.15 0.05 + 0.1 5 0.0 0.15 - 0.10 0.22 0.1 0.1 0.05 0.65 0.12 M NIPPON PRECISION CIRCUITS INC.--1 0.5 0.2 SM5304AV BLOCK DIAGRAM VCC ENABLE VIN 8th order LPF Buffer Clamp RFC VF VOUT GSEL GND PIN DESCRIPTION Number 1 2 3 4 5 6 7 8 1. I: input, O: output 2. A: analog, D: digital Name VIN ENABLE RFC VCC GND VOUT VF GSEL I/O1 I I O - - O I I A/D2 A D A - - A A D Input signal pin Enable signal input pin (with pull-down resistor) LPF cutoff frequency set pin 5V supply pin Ground pin Output signal pin Output signal feedback pin for sag compensation circuit Gain set signal input pin Description NIPPON PRECISION CIRCUITS INC.--2 SM5304AV SPECIFICATIONS Absolute Maximum Ratings Parameter Supply voltage range Storage temperature range Power dissipation Junction temperature Symbol VCC TSTG PD Tj ja = 214C/W (Note 1) Condition Rating - 0.3 to 7 - 55 to + 125 300 125 Unit V C mW C (Note 1) Tj is calculated by Tj = PD x ja + Ta (PD: Power dissipation (= VCC x ICC), ja: Thermal resistance, Ta: Ambient temperature). ja is measured value in the mounting condition which NPC specified. (glass epoxy board, board size: 40mm x 40mm, wiring density: 10%, still air) Recommended Operating Conditions Parameter Supply voltage range Operating temperature range Symbol VCC Ta Condition Rating 4.5 to 5.5 - 40 to 85 Unit V C Digital Characteristics VCC = 5.0V, Ta = 25C, unless otherwise noted. Rating Parameter HIGH-level input voltage 1 LOW-level input voltage 1 HIGH-level input voltage 2 LOW-level input voltage 2 Open-circuit input voltage HIGH-level input current 1 Input leakage current 1 Input leakage current 2 HIGH-level input current 2 LOW-level input current 2 Pull-down resistance 1 Pull-down resistance 2 Symbol VIH1 VIL1 VIH2 VIL2 VOPEN IIH1 ILL1 ILL2 IIH2 IIL2 RPD1 RPD2 ENABLE pin ENABLE pin GSEL pin GSEL pin GSEL pin ENABLE pin, VIN = VCC ENABLE pin, VIN = 0V GSEL pin, ENABLE = "LOW", VIN = 0V GSEL pin, ENABLE = "HIGH", VIN = VCC GSEL pin, ENABLE = "HIGH", VIN = 0V ENABLE pin GSEL pin when ENABLE = "LOW" Condition min 2.4 - VCC - 0.5 - VCC/2 - 0.5 - - - - - 40 16 typ - - - - - 100 - - 250 250 50 20 max - 0.8 - 0.5 VCC/2 + 0.5 200 1 1 400 400 60 24 V V V V V A A A A A k k Unit Test level I I I I I I I I I I I I NIPPON PRECISION CIRCUITS INC.--3 SM5304AV Electrical Characteristics VCC = 5.0V, Ta = 25C, unless otherwise noted, See Measurement circuit. Parameter Current consumption 1 Current consumption 2 Current consumption 3 Signal gain 1 Signal gain 2 Signal gain 3 Input voltage range Maximum output voltage Clamp voltage Overshoot/ Undershoot1 Output harmonic distortion Cutoff frequency control range Resistor (RFC ) value range2 Symbol ICC1 ICC2 ICC3 AV1 AV2 AV3 VIN Vout VCLMP VOS THD fC RFC FC fSB TPD f 4fc RFC = 4.3k, 100kHz and 5MHz group delay difference f = 1MHz, Vout = 2Vp-p, RFC = 4.3k Condition VCC = 4.5 to 5.5V, RFC = 2.7k, Ta = - 40 to 85C, ENABLE = "HIGH" VCC = 4.5 to 5.5V, RFC = 4.3k, Ta = - 40 to 85C, ENABLE = "HIGH" ENABLE = "LOW", GSEL = "LOW" GSEL = "LOW", RFC = 4.3k, f = 1MHz GSEL = "Open cct", RFC = 4.3k, f = 1MHz GSEL = "HIGH", RFC = 4.3k, f = 1MHz AC-coupled input, f = 100kHz Output conditions shown in Typical Connection Rating min - - - 5.7 - 0.3 11.5 1.4 2.4 0.9 - - 2 2.7 - - - typ 41 39 - 6.2 0.2 12.0 - - 1.2 4.0 0.7 - - - - 70 12 max 52 49 10 6.7 0.7 12.5 - - 1.45 - - 10 18 15 - - Unit mA mA A dB dB dB Vp-p Vp-p V % % MHz k % dB ns Test level II II I I I I I I I III III I I I III III Cutoff frequency error 4fc attenuation Group delay variation 1. The percentage output pulse overshoot when RFC = 4.3k, 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 = 25C II : 100% valid for alternative tests conducted at Ta = 25C III : Guaranteed based on design and characteristics evaluation Measurement circuit 4.7F Input VCC + VCC VIN ENABLE RFC RFC GSEL VF VOUT GND 22F + Output 75 75 VCC VCC 100F NIPPON PRECISION CIRCUITS INC.--4 + 75 75 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 [k] 18 15 12 10 8.2 6.8 5.6 4.7 4.3 3.9 3.3 2.7 Cutoff frequency [MHz] 1.9 2.3 2.8 3.3 3.9 4.6 5.5 6.4 6.9 7.5 8.7 10.5 Adjustment methods It can set up by the following methods. Since resistance affects cutoff frequency, please use a high precise thing. I Fixed resistor The frequency can be adjusted using an external resistor connected to RFC. RFC NIPPON PRECISION CIRCUITS INC.--5 SM5304AV I Variable resistor The frequency can be adjusted using a preset variable resistor VR connected to RFC. RFC I 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 I Resistor switch control The frequency can be adjusted by switching the resistance connected to RFC using logic voltage control. RFC SW Control NIPPON PRECISION CIRCUITS INC.--6 SM5304AV Gain Control Function and Enable Function ENABLE pin GSEL pin LOW HIGH (Enable) Open HIGH LOW LOW (Disable) Open 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. High impedance output Gain setting 6dB 0dB 12dB 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 NIPPON PRECISION CIRCUITS INC.--7 SM5304AV TYPICAL CHARACTERISTICS VCC = 5.0V, RFC = 4.3k, Ta = 25C, unless otherwise noted. 12 6 0 -6 Gain [dB] -12 -18 -24 -30 -36 -42 -48 0.1 1 10 Frequency [MHz] 100 Phase 6dB Gain 90 0 -90 Gain [dB] 12 Gain 0 6dB 150n 130n Group Delay [s] -180 -270 -360 -450 -540 -12 Phase [deg] 110n -24 Group Delay -36 90n 70n -48 50n 0.1 1 10 Frequency [MHz] 100 Figure 1. Phase vs Frequency Figure 2. Group Delay vs Frequency 18 12 12dB 6 Gain [dB] 0 0dB -6 -12 -18 -24 Gain [dB] 6dB 6 0dB 0 -6 -12 Rfc=10k Rfc=18k Rfc=4.3k Rfc=2.7k 100 0.1 1 10 Frequency [MHz] 100 -18 0.1 1 10 Frequency [MHz] Figure 3. Gain vs Frequency (Rfc = 4.3k) Figure 4. Gain vs Frequency (0dB) 12 6dB 6 Gain [dB] Gain [dB] 18 12dB 12 0 6 -6 Rfc=10k Rfc=18k Rfc=4.3k Rfc=2.7k 100 0 Rfc=10k Rfc=18k Rfc=4.3k Rfc=2.7k 10 100 -12 0.1 1 10 Frequency [MHz] -6 0.1 1 Frequency [MHz] Figure 5. Gain vs Frequency (6dB) Figure 6. Gain vs Frequency (12dB) NIPPON PRECISION CIRCUITS INC.--8 SM5304AV 12 10 8 fc [MHz] fc [MHz] 14 12 10 8 6 4 Rfc=10k 2 Rfc=18k 0 1 10 Rfc [k] 100 Rfc=4.3k Rfc=2.7k 6 4 2 0 -50 0 Ta [C] 50 100 Figure 7. fc vs Rfc Figure 8. fc vs Ta 50 47.5 45 ICC [mA] ICC [mA] 42.5 40 37.5 35 32.5 30 1 10 Rfc [k] 100 VCC=5.5V VCC=5.0V VCC=4.5V 45 43 Rfc=2.7k 41 39 Rfc=4.3k 37 35 -50 0 Ta [C] 50 100 Figure 9. ICC vs Rfc Figure 10. ICC vs Ta 45 Rfc=2.7k 43 15 12 9 12dB ICC [mA] 41 Gain [dB] Rfc=4.3k 6 3 6dB 39 37 0 35 4 4.5 5 VCC [V] 5.5 6 -3 0.2 0dB 0.4 0.6 0.8 1 1.2 VIN [Vp-p] 1.4 1.6 1.8 Figure 11. ICC vs VCC Figure 12. Gain vs VIN NIPPON PRECISION CIRCUITS INC.--9 SM5304AV 15 12 12dB (VIN=0.6Vp-p) 9 Gain [dB] 6 6dB (VIN=1.2Vp-p) 3 0 0dB (VIN=1.4Vp-p) -3 4 4.5 5 VCC [V] 5.5 6 Gain [dB] 15 12 12dB (VIN=0.6Vp-p) 9 6 6dB (VIN=1.2Vp-p) 3 0 0dB (VIN=1.4Vp-p) -3 -50 -25 0 25 Ta [C] 50 75 100 Figure 13. Gain vs VCC Figure 14. Gain vs Ta 4 Input signal frequency=1MHz 3.75 Vmaxout [Vp-p] 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 10F 5V + VCC 0.1F GSEL ENABLE + Input 4.7F VIN Clamp RFC 8th order LPF Buffer 100F + 75 Output 75 VOUT 22F + VF RFC GND 75 Output 75 NIPPON PRECISION CIRCUITS INC.--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 1F to 10F and ceramic capacitor about 0.01F to 0.1F 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 ) / ja Tjmax = 125 C, ja = 214 C/W 300 Power Dissipation [mW] 187 0 -40 Ta [ C] 60.8 85 Mounting conditions * * * * glass epoxy board board size: 40mm x 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. NIPPON PRECISION CIRCUITS INC.--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 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: sales@npc.co.jp NC0118AE 2003.02 NIPPON PRECISION CIRCUITS INC.--12 |
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