
ASAHI KASEI 
[AK4706] 
MS0507-E-00 
2006/05 
- 1 - 
GENERAL DESCRIPTION 
The AK4706 offers the ideal features for digital set-top-box systems. Using AKM's multi-bit architecture 
for its modulator, the AK4706 delivers a wide dynamic range while preserving linearity for improved 
THD+N performance. The AK4706 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 
AK4706 also including the audio switches, volumes, video switches, HD/SD video filters, etc. designed 
primarily for digital set-top-box systems with SCART routing. The AK4706 is offered in a space saving 
64-pin LQFP package.
FEATURES 
DAC 
Sampling Rates Ranging from 8kHz 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 
Analog Switches 
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 
Video Section 
Integrated LPF 
SD: –40dB@27MHz 
HD: –40dB@74.25MHz or 54MHz or 27MHz selectable 
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) 
Three G and B Inputs (ENC, VCR, HD), Two G and B Outputs (TV, HD)  
Bi-Directional Control for VCR-Red/Chroma 
YPbPr Option (to 6MHz) 
VCR Input Monitor 
Loop–Through Mode for Standby 
Auto–Startup Mode for Power Saving 
SCART Pin#16(Fast Blanking), Pin#8(Slow Blanking) Control 
S1/S2 DC Control 
2ch 24bit DAC with AV Switch & HD/SD Video Filter
AK4706