
ASAHI KASEI 
[AK4702EQ] 
MS0424-E-00 
2005/09 
- 1 - 
GENERAL DESCRIPTION 
The AK4702 offers the ideal features for digital set-top-box systems. Using AKM's multi-bit architecture 
for its modulator, the AK4702 delivers a wide dynamic range while preserving linearity for improved 
THD+N performance. The AK4702 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 
AK4702 also including the audio switches and volumes designed primarily for digital set-top-box systems. 
The AK4702 is offered in a space saving 48-pin LQFP package.
FEATURES 
        DAC 
 Sampling Rates Ranging from 8kHz to 50kHz 
 18bit 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: 18bit MSB justified, 18/16bit LSB justified, I
2
S
 Master clock: 256fs, 384fs 
 High Tolerance to Clock Jitter 
        Analog switches for SCART 
         Audio section 
 THD+N: -86dB (@2Vrms) 
 Dynamic Range: 96dB (@2Vrms) 
Stereo Analog Volume with Zero-cross Detection Circuit
(+6dB to –60dB & Mute)
Five Analog Inputs 
     Two Stereo Input (TV, VCR SCART) 
   One Mono Input for Tone 
Five Analog Outputs 
   Two Stereo Outputs (TV, VCR SCART) 
    One Mono Output 
Loop-through mode for standby 
Pop Noise Free Circuit for Power on/off 
         Video section 
75ohm driver 
6dB Gain for Outputs 
 Adjustable gain 
Four CVBS/Y inputs (ENCx2, TV, VCR),  
Three CVBS/Y output (RF, TV, VCR) 
Three R/C inputs (ENCx2, VCR), Two R/C output (TV, VCR) 
Bi-directional control for VCR-Chroma/Red 
Two G and B inputs (ENC, VCR), One G and B outputs (TV) 
        Power supply 
5V+/-5% and 12.6V~10V 
Low Power Dissipation
Package
Small 48pin LQFP
2ch DAC with AV SCART switch 
AK4702EQ