[AK4252] AK4252 Output Coupling Capacitor-less Video Amp with LPF GENERAL DESCRIPTION The AK4252 is a Video Amp with LPF. The output coupling capacitor can be removed because the AK4252 includes the negative power supply circuit. The AK4252 is housed in a space-saving 8-pin USON package. FEATURE 1. Video Function • A Composite Video Input • A Video-Amp (+12dB) 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 VOUT LPF Clock Generator VDD Charge Pump CP CN VSS VEE Figure 1. AK4252 Block Diagram MS1091-E-01 2010/04 -1- [AK4252] ■ Ordering Guide AK4252VU AKD4252 −40 ∼ +85°C 8 pin USON (0.5mm pitch) Evaluation board for AK4252 ■ Pin Layout CP 1 VDD 2 VIN 3 PDN 4 Top View MS1091-E-01 8 CN 7 VEE 6 VSS 5 VOUT 2010/04 -2- [AK4252] PIN/FUNCTION No. Pin Name CP I/O O 1 2 3 VDD VIN I 4 PDN I 5 6 7 8 VOUT VSS VEE CN 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 100kΩ. “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; Note 1) 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 value is smaller value between (VDD+0.3)V and 4.0V. The VOUT pin becomes Hi-Z at the PDN pin = “L”. Therefore the VOUT pin is available to signal line from another device by Wired-OR. The input signal to the VOUT pin must not exceed 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; Note 1) Parameter Power Supplies Symbol VDD min 2.7 typ 3.0 max 3.6 Units V Note 1. All voltages with respect to ground. * AKM assumes no responsibility for the usage beyond the conditions in this datasheet. MS1091-E-01 2010/04 -3- [AK4252] ANALOG CHRACTERISTICS (Ta=25°C; VDD=3.0V; VSS = 0V; unless otherwise specified) Parameter Conditions min typ max Units V Input Characteristics Input Voltage 0.75 Vpp Input Sync Chip Clamp Voltage (Note 3) -0.193 -0.143 -0.093 V V Output Characteristics (Note 4) Output Gain VIN=100kHz, 0.2Vpp 11.0 12.0 13.0 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 Ω 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 2 μA Note 3. The Charge Pump circuit will not work well, if the sync chip clamp voltage input to the VIN pin is not 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 R2 75 ohm R1 C1 C2 Figure 2. Load Capacitance C1 and C2 DC CHRACTERISTICS (Ta=25°C; VDD=2.7 ∼ 3.6V) Parameter High-Level Input Voltage Low-Level Input Voltage (PDN pin) (PDN pin) Symbol VIH VIL MS1091-E-01 min 1.5 - typ - max 0.6 Units V V 2010/04 -4- [AK4252] ■ Video Block The Video Amp has drivability for a load resistance of 150Ω. The AK4252 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. AK4252 VDD Charge Pump CP CN Negative Power VSS 1uF VEE C2 (+) C1 1uF (+) 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 AK4252 75Ω VOUT 75Ω 0V Figure 4. Video signal output ■ Power Down Control When the PDN pin is “L”, the AK4252 is forced to Power Down Mode (Power consumption: typ 1μA). The VOUT pin becomes Hi-Z at the PDN pin = “L”. The AK4252 includes a power-on-reset function. Therefore any external reset is not required. MS1091-E-01 2010/04 -5- [AK4252] SYSTEM DESIGN Figure 5 shows the system connection diagram for the AK4252. An evaluation board [AKD4252] is available which demonstrates the optimum layout, power supply arrangements and measurement results. (+) Power Supply 2.7∼3.6V 10µ + 1µ 1 CP 0.1µ CN 8 0.1u 1µ VEE 7 2 VDD (+) Top View VSS 6 3 VIN 75 VOUT 5 4 PDN DSP or μP Figure 5. Typical Connection Diagram Note: - Any voltage must not be applied to the CN pin. MS1091-E-01 2010/04 -6- [AK4252] PACKAGE 8pin USON (Unit: mm) 2.2 ± 0.05 0.25 ± 0.05 1.2 ± 0.05 2.2 ± 0.05 1.9 ± 0.05 0.05 0.5 M 0.2 ± 0.05 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. 0.05 ■ Material & Lead finish Package molding compound: Lead frame material: Lead frame surface treatment: Epoxy, Halogen (bromine and chlorine) free Ni Au plate MS1091-E-01 2010/04 -7- [AK4252] MARKING ■ AK4252VU 252 XXX 1 XXX: Date code (3 digit) REVISION HISTORY Date (YY/MM/DD) 09/06/10 10/04/08 Revision 00 03 Reason First Edition Error Correct Page Contents 7 ■ Material & Lead finish Lead frame surface treatment: Ag plate → Au plate IMPORTANT NOTICE z These products and their specifications are subject to change without notice. When you consider any use or application of these products, please make inquiries the sales office of Asahi Kasei Microdevices Corporation (AKM) or authorized distributors as to current status of the products. z AKM assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of any information contained herein. z 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. z AKM products are neither intended nor authorized for use as critical componentsNote1) in any safety, life support, or other hazard related device or systemNote2), and AKM assumes no responsibility for such use, except for the use approved with the express written consent by Representative Director of AKM. As used here: Note1) 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. Note2) 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. z It is the responsibility of the buyer or distributor of AKM products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third 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. MS1091-E-01 2010/04 -8-