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| ASAHI KASEI [AK4250] AK4250 Output Coupling Capacitor-less Video Amp with LPF GENERAL DESCRIPTION The AK4250 is a Video Amp with LPF. The output coupling capacitor can be removed because the AK4250 includes the negative power supply circuit. The AK4250 is housed in a space-saving 8-pin USON package. FEATURE 1. Video Function * A Composite Video Input * A Video-Amp (+6dB) for Composite Video Signal * Low Pass Filter * Charge pump circuit for negative power supply 2. Ta = -40 85 C 3. Power Supply: 2.7 3.6V (typ. 3.0V) 4. Power Supply Current: 10 mA 5. Package: 8 pin USON Block Diagram PDN VIN Clamp LPF VOUT VDD Charge Pump Clock Generator CP CN VSS VEE Figure 1. AK4250 Block Diagram MS0540-E-00 -1- 2007/03 ASAHI KASEI [AK4250] Ordering Guide AK4250VU AKD4250 -40 +85C 8 pin USON (0.5mm pitch) Evaluation board for AK4250 Pin Layout CP 1 8 CN VDD VIN 2 7 VEE 3 Top View 6 VSS PDN 4 5 VOUT MS0540-E-00 -2- 2007/03 ASAHI KASEI [AK4250] PIN/FUNCTION No. 1 2 3 4 5 6 7 8 Pin Name CP VDD VIN PDN VOUT VSS VEE CN I/O O I I O O I Function Positive Charge Pump Capacitor Terminal Pin Power Supply Pin. Composite Video Signal Input Pin Power-Down Mode Pin. Internal Pull Down 100k. "H": Power up, "L": Power down. Composite Video Signal Driver Pin Ground Pin Negative Voltage Output Pin for Video Amplifier Negative Charge Pump Capacitor Terminal Pin ABSOLUTE MAXIMUM RATINGS (VSS=0V; Note1) Parameter Power Supplies: Input Current, Any Pin Except Supplies Input Voltage (Note 2) Ambient Temperature (powered applied) Storage Temperature Symbol VDD IIN VIN Ta Tstg min -0.3 -0.3 -40 -65 max 4.0 10 (VDD+0.3) or 4.0 85 150 Units V mA V C C Note 1. All voltages are with respect to ground. Note 2. VIN, PDIN pins. Max is smaller value between (VDD+0.3)V and 4.0V VOUT pin becomes Hi-Z at PDN pin = "L". Therefore VOUT pin is available to signal line from another device by Wired-OR. The input signal to VOUT pin mustn't exceeds this input voltage range. Any voltage must not be applied to the CN pin. WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. RECOMMENDED OPERATING CONDITIONS (VSS=0V; Note1) Parameter Power Supplies Note 1. All voltages with respect to ground. * AKM assumes no responsibility for the usage beyond the conditions in this datasheet. Symbol VDD min 2.7 typ 3.0 max 3.6 Units V MS0540-E-00 -3- 2007/03 ASAHI KASEI [AK4250] ANALOG CHRACTERISTICS (Ta=25C; VDD =3.0V; VSS = 0V; unless otherwise specified) Parameter Conditions min typ max Units V Input Characteristics Input Voltage 1.5 Vpp Input Sync Chip Clamp Voltage (Note 3) -0.386 -0.286 -0.186 V V Output Characteristics (Note 4) Output Gain VIN=100kHz, 0.2Vpp 5.0 6.0 7.0 dB Maximum output voltage VIN=100kHz , THD=-30dB 2.52 Vpp 65 dB S/N BW=100kH 6MHz, (Note 5) Secondary Distortion VIN=3.58MHz, 0.2Vpp (Sin Wave) -45 dB Load Resistance 140 150 15 pF Load Capacitance C1 (Figure 2) 400 pF C2 (Figure 2) LPF Frequency Response Response at 6.75MHz -3 -0.5 dB Input= 0.2Vpp, Sin Wave Response at 27MHz -40 -20 dB (0dB at 100kHz) Group Delay |GD3MHz - GD6MHz| 10 100 nsec Power Supplies Power Up Black signal is output and no load 10 15 mA resistance. Power Down PDN pin = 0V 1 20 A Note 3. The Charge Pump circuit doesn't work well, if the sync chip clamp voltage input to VIN pin isn't within this voltage range. This sync chip clamp voltage is the voltage from the pedestal voltage Note 4. The measurement point is the point A in Figure 2 Note 5. The reference signal is the 100% white signal. Measurement Point A 75 ohm Video Signal Output R1 C1 C2 R2 75 ohm Figure 2. Load Capacitance C1 and C2 DC CHRACTERISTICS (Ta=25C; VDD=2.7 3.6V) Parameter High-Level Input Voltage Low-Level Input Voltage Symbol VIH VIL min 1.5 typ max 0.6 Units V V (PDN pin) (PDN pin) MS0540-E-00 -4- 2007/03 ASAHI KASEI [AK4250] Video Block The Video Amp has a drivability for a load resistance of 150. The AK4250 has a composite input and output and includes a low pass filter (LPF). Internal negative power supply circuit supplies negative voltage to the video amp and video amp 0V output is used for a pedestal level. Therefore, the output coupling capacitor can be removed. AK4250 VDD Charge Pump Negative Power CP (+) CN 1uF VSS C2 (+) VEE 1uF C1 Note 6. C1 and C2 capacitors should have the low ESR (Equivalent Series Resistance) over all temperature range. When these capacitors have the polarity, the positive polarity pin should be connected to the CP pin and the VSS pin. Non polarity capacitors can also be used. Figure 3. Negative Power Supply circuit AK4250 75 VOUT 75 0V Figure 4. Video signal output Power Down Control When the PDN pin is "L", the AK4250 is forced to the Power Down Mode (Power consumption: typ 1A). VOUT pin becomes Hi-Z at PDN pin = "L". The AK4250 includes a power-on-reset function. Therefore any reset isn't required externally. MS0540-E-00 -5- 2007/03 ASAHI KASEI [AK4250] SYSTEM DESIGN Figure 5 shows the system connection diagram for the AK4250. An evaluation board [AKD4250] is available which demonstrates the optimum layout, power supply arrangements and measurement results. (+) 1 Power Supply 2.73.6V 10 + 0.1 0.1u 1 CP 2 VDD CN 8 VEE 7 1 (+) Top View VSS 6 3 VIN 75 4 PDN VOUT 5 DSP or P Figure 5. Typical Connection Diagram Note: - Any voltage must not be applied to the CN pin. MS0540-E-00 -6- 2007/03 ASAHI KASEI [AK4250] PACKAGE 8pin USON (Unit : mm) 2.2 0.05 1.9 0.05 0.25 0.05 0.05 0.5 0.2 0.05 2.2 0.05 1.2 0.05 M 0.05 Material & Lead finish Package molding compound: Lead frame material: Lead frame surface treatment: Epoxy Ni Ag plate MS0540-E-00 -7- 0.6MAX We recommend mounting this portion onto circuit board in order to secure mounting intensity. Please do not connect to a Power Supply, GND, Signal Line, etc. 2007/03 ASAHI KASEI [AK4250] MARKING AK4250VU 250 XXX 1 XXX: Date code (3 digit) REVISION HISTORY Date (YY/MM/DD) 07/03/28 Revision 00 Reason First Edition Page Contents IMPORTANT NOTICE * These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. * AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. * Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. * AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: a. A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. b. A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. * It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification. MS0540-E-00 -8- 2007/03 |
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