[AK4706]
AK4706
2ch 24bit DAC with AV Switch & HD/SD Video Filter
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
MS0507-E-01
-1-
2010/09
AKM [ ASAHI KASEI MICROSYSTEMS ]
