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AK4705A
A/V Switch with Audio DAC and component video filter for STB Applications
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. Applications : 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