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AK4252 Dataheets PDF



Part Number AK4252
Manufacturers Asahi Kasei Microsystems
Logo Asahi Kasei Microsystems
Description Output Coupling Capacitor-less Video Amp
Datasheet AK4252 DatasheetAK4252 Datasheet (PDF)

ASAHI KASEI [AK4250/52] = Preliminary = AK4250/52 Output Coupling Capacitor-less Video Amp with LPF GENERAL DESCRIPTION The AK4250/52 are a Video Amp with LPF. The output coupling capacitor can be removed because the AK4250/52 include the negative power supply circuit. The AK4250/52 are housed in a space-saving 8-pin USON package. FEATURE 1. Video Function • A Composite Video Input • A Video-Amp for Composite Video Signal AK4250: +6dB www.DataSheet4U.com Ak4252: +12dB • Low Pass Filter • Charg.

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ASAHI KASEI [AK4250/52] = Preliminary = AK4250/52 Output Coupling Capacitor-less Video Amp with LPF GENERAL DESCRIPTION The AK4250/52 are a Video Amp with LPF. The output coupling capacitor can be removed because the AK4250/52 include the negative power supply circuit. The AK4250/52 are housed in a space-saving 8-pin USON package. FEATURE 1. Video Function • A Composite Video Input • A Video-Amp for Composite Video Signal AK4250: +6dB www.DataSheet4U.com Ak4252: +12dB • 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. AK4250/52 Block Diagram Rev.0.4 -12006/11 ASAHI KASEI [AK4250/52] „ Ordering Guide AK4250VU AK4252VU AKD4250/52 −40 ∼ +85°C 8 pin USON (0.5mm pitch) −40 ∼ +85°C 8 pin USON (0.5mm pitch) Evaluation board for AK4250/52 „ Pin Layout CP 1 8 CN www.DataSheet4U.com VDD VIN 2 7 VEE 3 Top View 6 VSS PDN 4 5 VOUT Rev.0.4 -2- 2006/11 ASAHI KASEI [AK4250/52] 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 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 www.DataSheet4U.com ABSOLUTE MAXIMUM RATINGS (VSS=0V; Note1) Parameter Symbol min Power Supplies: VDD −0.3 Input Current, Any Pin Except Supplies IIN Input Voltage (Note 2) VIN −0.3 Ambient Temperature (powered applied) Ta −40 Storage Temperature Tstg −65 max 4.0 ±10 (VDD+0.3) or 4.0 85 150 Units V mA V °C °C Note 1. All voltages 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. Then the input signal to VOUT pin mustn’t exceeds this input voltage range. The 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 Rev.0.4 -3- 2006/11 ASAHI KASEI [AK4250/52] ANALOG CHRACTERISTICS (Ta=25°C; VDD =3.0V; VSS = 0V; unless otherwise specified) Parameter Conditions Min typ max Units V Input Characteristics Input Voltage AK4250 1.5 Vpp AK4252 0.75 Vpp Input Sync Chip Clamp (Note 3) AK4250 -0.386 -0.286 -0.186 V Voltage AK4252 TBD -0.143 TBD V V Output Characteristics (Note 4) Output Gain VIN=100kHz, 0.2Vpp AK4250 5.0 6.0 7.0 dB VIN=100kHz, TBD Vpp AK4252 TBD 12.0 TBD dB Maximum output voltage VIN=100kHz , THD=-30dB AK4250 2.52 Vpp AK4252 2.52 Vpp S/N AK4250 65 dB BW=100kH ∼ 6MHz, (Note 5) www.DataSheet4U.com AK4252 62 dB Secondary Distortion VIN=3.58MHz, 0.2Vpp(Sin Wave) -45 dB Load Resistance 140 150 Ω Load Capacitance C1(see Figure 2) 15 pF C2(see Figure 2) 400 pF LPF Frequency Response Response at 6.75MHz TBD -0.5 dB Input= 0.2Vpp, Sin Wave Response at 27MHz -40 TBD dB (0dB at 100kHz) Group Delay |GD3MHz - GD6MHz| 10 TBD nsec Power Supplies Power Up Black signal is output and no load resistance. 10 TBD mA Power Down PDN pin = 0V 1 TBD μA 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=25°C; 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) Rev.0.4 -4- 2006/11 ASAHI KASEI [AK4250/52] „ Video Block The Video Amp has a drivability for a load resistance of 150Ω. The AK4250/52 have a composite input and output and includes a low pass filter (LPF). Internal negative power supply circuit supplies the negative voltage to the video amp and the video amp 0V output is used for a pedestal level. Therefore, the output coupling capacitor can be removed. AK4250/52 VDD Charge Pump Negative Power www.DataSheet4U.com 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. N.


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