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AK4955 Datasheet(PDF) 11 Page - Asahi Kasei Microsystems |
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AK4955 Datasheet(HTML) 11 Page - Asahi Kasei Microsystems |
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11 / 117 page  [AK4955] MS1343-E-00 2011/12 - 11 - Parameter min typ max Unit Video Signal Input External Resistor (Note 21) R1 (Figure 2) - - 600 Ω External Capacitor C1 (Figure 2) 0.05 0.1 0.2 μF Maximum Input Voltage: VG1-0 bits = “00” (+6dB) - 1.0 1.24 Vpp Pull Down Current - 0.5 - μA Video Analog Output (Figure 3) VG1-0 bits = “00”, 1.0Vpp Input 5.5 6.0 6.5 VG1-0 bits = “01”, 0.7Vpp Input 8.5 9.0 9.5 VG1-0 bits = “10”, 0.5Vpp Input 11.5 12.0 12.5 Output Gain fin =100kHz Sine wave Input (Note 20) VG1-0 bits = “11”, 0.3Vpp Input 16 16.5 17 dB Signal Input (Pedestal Level) −100 0 100 mV DC Output Offset Level (Note 20) No Signal Input - −572 - mV S/N (Note 22) VG1-0 bits = “00”(+6dB) BW = 100kH ∼ 6MHz, S = 0.7Vpp Input 60 70 - dB Maximum Output Voltage (Note 20) fin =100kHz (Sine wave) 2.62 - - Vpp Secondary Harmonic Distortion VG1-0 bits = “00”(+6dB), fin = 3.58MHz, 1.0Vpp: −40 ~ 100IRE, Sine Wave Input - −40 −30 dB Load Resistance 140 150 - Ω Load Capacitance C2 (Figure 3) C3 (Figure 3) - - - - 15 400 pF pF fin = 10kHz - 58 - dB PSRR VG1-0 bits = “00”(+6dB) fin = 100kHz - 53 - dB LPF for VIN signal : (Note 20) Frequency Response (fin = 100kHz, 1.0Vpp, Sine wave Input) Response at 6.75MHz −3.0 −0.5 +2.0 Response at 27MHz - −40 −20 dB Group Delay |GD3MHz −GD6MHz| - 15 100 ns Note 20. This is a value at measurement point in Figure 3. 1.0Vpp input is the value when VG1-0 bits =“00”. Input amplitude is in inverse proportion to the gain. S/N is measured at measuring point 2. Note 21. PMV bit must be set to “0” if the input impedance of the VIN pin exceeds 600Ω in case of the input signal is stopped or the input circuit of the VIN pin is powered down. Note 22. S/N = 20xlog (Output Voltage[Vpp]/Noise Level[Vrms]). Output Voltage = 0.7 [Vpp]. AK4955 VIN pin R1 From Video DAC C1 Figure 2. External Resistor of Video Signal Input pin Video Signal Output 75 ohm 75 ohm C3 R2 R3 C2 Measurement point1 Measurement point2 Figure 3. Load Capacitance C2 and C3 |
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