[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 or 8-pin TMSOP 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 (AK4250VU) 8 pin TMSOP (AK4250VT) ■ Block Diagram PDN VIN Clamp VOUT LPF Clock Generator VDD Charge Pump CP CN VSS VEE Figure 1. AK4250 Block Diagram MS0540-E-04 2010/06 -1- [AK4250] ■ Ordering Guide AK4250VU AK4250VT AKD4250 −40 ∼ +85°C 8 pin USON (0.5mm pitch) −40 ∼ +85°C 8 pin TMSOP Evaluation board for AK4250 ■ Pin Layout AK4250VU CP 1 8 CN VDD 2 7 VEE 6 VSS 5 VOUT VIN 3 PDN 4 Top View AK4250VT CP 1 5 CN VDD 2 6 VEE VIN 3 7 VSS PDN 4 8 VOUT Top View MS0540-E-04 2010/06 -2- [AK4250] 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 Symbol min max Units Power Supplies: VDD −0.3 4.0 V Input Current, Any Pin Except Supplies IIN ±10 mA Input Voltage (Note 2) VIN −0.3 (VDD+0.3) or 4.0 V Ambient Temperature (powered applied) Ta −40 85 °C Storage Temperature Tstg −65 150 °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 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 Note 1. All voltages with respect to ground. Symbol VDD min 2.7 typ 3.0 max 3.6 Units V * AKM assumes no responsibility for the usage beyond the conditions in this datasheet. MS0540-E-04 2010/06 -3- [AK4250] ANALOG CHRACTERISTICS (Ta=25°C; 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 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 MS0540-E-04 min 1.5 - typ - max 0.6 Units V V 2010/06 -4- [AK4250] ■ Video Block The Video Amp has a drivability for a load resistance of 150Ω. 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 CP CN Negative Power VSS (+) 1uF C1 C2 VEE 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 AK4250 75Ω VOUT 75Ω 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 1μA). The VOUT pin becomes Hi-Z at the PDN pin = “L”. The AK4250 includes a power-on-reset function. Therefore any reset is not required externally. MS0540-E-04 2010/06 -5- [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. (+) 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. MS0540-E-04 2010/06 -6- [AK4250] PACKAGE (AK4250VU) 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 Ni Au plate MS0540-E-04 2010/06 -7- [AK4250] PACKAGE (AK4250VT) 8pin TMSOP (Unit: mm) 0.127 +0.1 -0.05 0.95 max. 0.55±0.2 2.8 4.0±0.2 2.9 +0.12 -0.1 0.65 +0.1 0.1 -0.05 0~10° 0.1 0.2±0.05 0.1 M ■ Material & Lead finish Package molding compound: Lead frame material: Lead frame surface treatment: Epoxy Cu Sn-Bi (Pb free) MS0540-E-04 2010/06 -8- [AK4250] MARKING (AK4250VU) 250 XXX 1 XXX: Date code (3 digit) MARKING (AK4250VT) 8 7 6 5 (1) #1Pin Indicator (2) Chip No. (AK4xxx=xxx) (3) Year 1 Digit (4) Month 1 Digit (5) Manage Code (Internal use) 250 (2) YMA (1) (3) (4) (5) 1 2 3 4 MS0540-E-04 2010/06 -9- [AK4250] REVISION HISTORY Date (YY/MM/DD) 07/03/28 07/11/05 Revision 00 01 Reason First Edition Spec Change Page Contents 4 08/09/05 10/04/08 02 03 Error Correct Error Correct 8 7 10/06/07 04 Description Addition Power supply current consumption at power down max 20μA → 2μA Marking was changed. ■ Material & Lead finish Lead frame surface treatment: Ag plate → Au plate The AK4250VT was added. 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 Descriptions of external circuits, application circuits, software and other related information contained in this document are provided only to illustrate the operation and application examples of the semiconductor products. You are fully responsible for the incorporation of these external circuits, application circuits, software and other related information in the design of your equipments. AKM assumes no responsibility for any losses incurred by you or third parties arising from the use of these information herein. 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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. MS0540-E-04 2010/06 - 10 -