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AK4705A
音频/视频切换开关 配有音频DAC以及适用于STB的分量视频滤波器
The AK4705A offers the ideal features for digital set-top-box systems. Using AKM multi-bit architecture for its audio DAC, the AK4705A delivers a wide dynamic range while preserving linearity for improved THD+N performance. The AK4705A integrates a combination of SCF and CTF filters, removing the need for high cost external filters and increasing performance for systems with excessive clock jitter. The AK4705A also including the audio switches, volumes, video switches, video filters, designed primarily for digital set-top-box systems. The AK4705A is offered in a space saving 48-pin LQFP package.
Features
  1. Application s : Digital TV, Set-Top Box
  2. DAC
         Sampling Rates Ranging from 32kHz to 50kHz
         64dB High Attenuation 8x FIR Digital Filter
         2nd Order Analog LPF
         On Chip Buffer with Single-Ended Output
         Digital De–Emphasis for 32k, 44.1k and 48kHz Sampling
         I/F Format: 24bit MSB Justified, I 2 S, 18/16bit LSB Justified
         Master Clock: 256fs, 384fs
         High Tolerance to Clock Jitter
  3. Analog Switches for SCART
  4. Audio Section
         THD+N: –86dB (@2Vrms)
         Dynamic Range: 96dB (@2Vrms)
         Stereo Analog Volume with Pop-noise Free Circuit
         (+6dB to –60dB & Mute)
         Analog Inputs
             Two Stereo Inputs (TV&VCR SCART)
             One Stereo Input (Changeover to Internal DAC)
         Analog Outputs
             Two Stereo Outputs (TV, VCR SCART)
             One Mono Output (Modulator)
         Pop Noise Free Circuit for Power On/Off
  5. Video Section
         Integrated LPF: –40dB@27MHz
         75ohm Driver
         6dB Gain for Outputs
         Adjustable Gain
         Four CVBS/Y Inputs (ENCx2, TV, VCR),
         Three CVBS/Y Outputs (RF, TV, VCR)
         Three R/C Inputs (ENCx2, VCR),
         Two R/C outputs (TV, VCR)
         Bi-Directional Control for VCR-Red/Chroma
         Two G and B Inputs (ENC, VCR),
         One G and B Outputs (TV)
         Y/Pb/Pr Option (to 6MHz)
         VCR Input Monitor
  6. Loop–Through Mode for Standby
  7. Auto–Startup Mode for Power Saving
  8. SCART Pin#16(Fast Blanking), Pin#8(Slow Blanking) Control
  9. AK4702/04 Software Compatible
  10. Power Supply:
         5V+/–5% and 12V+/–5%
         Low Power Dissipation / Low Power Standby Mode
  11. Package: Small 48pin LQFP
  12. Evaluation Board: AKD4705A
AK4705A BLOCK DIAGRAM
AK4705 Diagram
AK4705
AK4705
For further information of AK4705A, contact us at:
  • Data Sheet PDF
Data Sheet
Data Sheet
Rev. MS0935-E-01 2008/04
PDF : 381KB / 19pages
Data Sheet
Evaluation Board Manual
Rev. KM091000 2007/09
PDF : 467KB / 34pages