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PDF AK4704 Data sheet ( Hoja de datos )
| Número de pieza | AK4704 | |
| Descripción | 2ch 24bit DAC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK4704 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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ASAHI KASEI
AKM CONFIDENTIAL
[AK4704]
www.DataSheet4U.com
= 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, I2S, 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
1 page  
ASAHI KASEI
No. Pin Name
1 VCRC
2 VVSS
3 TVVOUT
4 VVD2
5 TVRC
6 TVG
7 TVB
8 VVD1
9 ENCB
10 ENCG
11 ENCRC
12 ENCC
13 ENCV
14 ENCY
15 TVVIN
16 VCRVIN
17 VCRFB
18 VCRRC
19 VCRG
20 VCRB
21 INT
22 VCRSB
23 TVSB
24 VCRINR
25 VCRINL
26 TVINR
27 TVINL
28 FILT
29 VCROUTR
30 VCROUTL
31 TVOUTR
32 TVOUTL
33 MONOOUT
34 VP
35 DVCOM
36 PVCOM
AKM CONFIDENTIAL
[AK4704]
www.DataSheet4U.com
PIN/FUNCTION
I/O Function
O Chrominance Output Pin for VCR
- Video Ground Pin. 0V.
O Composite/Luminance Output Pin for TV
- Video Power Supply Pin #2. 5V.
Normally connected to VVSS with a 0.1µF ceramic capacitor in parallel with
a 10µF electrolytic cap.
O Red/Chrominance Output Pin for TV
O Green Output Pin for TV
O Blue Output Pin for TV
- Video Power Supply Pin #1. 5V.
Normally connected to VVSS with a 0.1µF ceramic capacitor in parallel with
a 10µF electrolytic cap.
I Blue Input Pin for Encoder
I Green Input Pin for Encoder
I Red/Chrominance Input Pin1 for Encoder
I Chrominance Input Pin2 for Encoder
I Composite/Luminance Input Pin1 for Encoder
I Composite/Luminance Input Pin2 for Encoder
I Composite/Luminance Input Pin for TV
I Composite/Luminance Input Pin for VCR
I Fast Blanking Input Pin for VCR
I Red/Chrominance Input Pin for VCR
I Green Input Pin for VCR
I Blue Input Pin for VCR
O Interrupt Pin for Video Blanking
I/O Slow Blanking Input/Output Pin for VCR
O Slow Blanking Output Pin for TV
I Rch VCR Audio Input Pin
I Lch VCR Audio Input Pin
I Rch TV Audio Input Pin
I Lch TV Audio Input Pin
O Filter Pin
Normally connected to VVSS with a 0.1µF ceramic capacitor.
O Rch Analog Output Pin1
O Lch Analog Output Pin1
O Rch Analog Output Pin2
O Lch Analog Output Pin2
O MONO Analog Output Pin
- Power Supply Pin. 12V.
Normally connected to VSS with a 0.1µF ceramic capacitor in parallel with a
10µF electrolytic cap.
O DAC Common Voltage Pin
Normally connected to VSS with a 0.1µF ceramic capacitor in parallel with a
10µF electrolytic cap.
O Audio Common Voltage Pin
Normally connected to VSS with a 0.1µF ceramic capacitor in parallel with a
10µF electrolytic cap. The caps affect the settling time of audio bias level.
Rev. 0.5
-5-
2004/1
5 Page 
ASAHI KASEI
AKM CONFIDENTIAL
[AK4704]
www.DataSheet4U.com
FILTER CHARACTERISTICS
(Ta = 25°C; VP=11.4∼12.6V, VD = 4.75∼5.25V, VVD1=VVD2 = 4.75∼5.25V; fs = 48kHz; DEM0 = “1”, DEM1 = “0”)
Parameter
Symbol
min
typ
max Units
Digital filter
Passband
±0.05dB (Note: 14)
PB
0
21.77
kHz
-6.0dB
- 24.0 - kHz
Stopband
(Note: 14)
SB
26.23
kHz
Passband Ripple
PR
± 0.01
dB
Stopband Attenuation
SA 64
dB
Group Delay
(Note: 15)
GD
-
24
- 1/fs
Digital Filter + LPF
Frequency Response 0 ∼ 20.0kHz
FR - ± 0.5 - dB
Note: 14. The passband and stopband frequencies scale with fs (system sampling rate).
e.g.) PB=0.4535×fs (@±0.05dB), SB=0.546×fs.
Note: 15. The calculating delay time which occurred by digital filtering. This time is from setting the 16/18/24bit data of
both channels to input register to the output of analog signal.
Rev. 0.5
- 11 -
2004/1
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4704.PDF ] | |
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