AK4704 参数 Datasheet PDF下载

ASAHI KASEI

AKM CONFIDENTIAL

[AK4704]

= Target Spec =

AK4704

2ch 24bit DAC with AV SCART switch

GENERAL DESCRIPTION

The AK4704 offers the ideal features for digital set-top-box systems. Using AKM's multi-bit architecture

for its modulator, the AK4704 delivers a wide dynamic range while preserving linearity for improved

THD+N performance. The AK4704 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

AK4704 also including the audio switches, volumes, video switches, video filters, etc. designed primarily

for digital set-top-box systems. The AK4704 is offered in a space saving 48-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 for SCART

Audio section

THD+N: -86dB (@2Vrms)

Dynamic Range: 96dB (@2Vrms)

Stereo Analog Volume with Zero-cross Detection Circuit

(+6dB to –60dB & Mute)

Six Analog Inputs

Two Stereo Input (TV&VCR SCART)

One Stereo Input (changeover to internal DAC)

Five Analog Outputs

Two Stereo Outputs (TV, VCR SCART)

One Mono Output (Modulator)

Pop Noise Free Circuit for Power on/off

Video section

Integrated LPF: -40dB@27MHz

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)

Y/C Mixer for RF output

VCR input monitor

Loop-through Mode for standby

Auto-Startup Mode for power saving

SCART pin#16(Fast Blanking), pin#8(Slow Blanking) Control

Power supply

5V+/-5% and 12V+/-5%

Low Power Dissipation / Low Power Standby Mode

Package

Small 48pin LQFP

Rev. 0.5

-1-

2004/1