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PDF AK4705 Data sheet ( Hoja de datos )
| Número de pieza | AK4705 | |
| Descripción | 2ch 24bit DAC | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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[AK4705]
www.DataSheet4U.com
AK4705
2ch 24bit DAC with AV SCART Switch
GENERAL DESCRIPTION
The AK4705 offers the ideal features for digital set-top-box systems. Using AKM's multi-bit architecture
for its modulator, the AK4705 delivers a wide dynamic range while preserving linearity for improved
THD+N performance. The AK4705 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
AK4705 also including the audio switches, volumes, video switches, video filters, etc. designed primarily
for digital set-top-box systems. The AK4705 is offered in a space saving 48-pin LQFP package.
FEATURES
DAC
Sampling Rates Ranging from 32kHz 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 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: –40dB@27MHz
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)
Bi-Directional Control for VCR-Red/Chroma
Two G and B Inputs (ENC, VCR),
One G and B Outputs (TV)
Y/Pb/Pr 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
AK4702/04 Software Compatible
MS0451-E-01
-1-
2007/06
1 page  
■ Ordering Guide
AK4705
■ Pin Layout
-10 ∼ +70°C
48pin LQFP (0.5mm pitch)
[AK4705]
www.DataSheet4U.com
VSS
VD
MCLK
BICK
SDTI
LRCK
SCL
SDA
PDN
RFV
VCRVOUT
TVFB
37
38
39
40
41
42
43
44
45
46
47
48
AK4705VQ
Top View
24 TVSB
23 VCRSB
22 INT
21 VCRB
20 VCRG
19 VCRRC
18 VCRFB
17 VCRVIN
16 TVVIN
15 ENCY
14 ENCV
13 ENCC
MS0451-E-01
-5-
2007/06
5 Page 
[AK4705]
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(VSS=VVSS=0V;Note: 1)
Parameter
Symbol
Power Supply
VD
VVD1
VVD2
VP
Input Current (any pins except for supplies)
IIN
Input Voltage
VIND
Video Input Voltage
VINV
Audio Input Voltage (except DACL/R pins)
VINA
Audio Input Voltage (DACL/R pins)
VINA
Ambient Operating Temperature
Ta
Storage Temperature
Tstg
Note: 1. All voltages with respect to ground.
min
-0.3
-0.3
-0.3
-0.3
-
-0.3
-0.3
-0.3
-0.3
-10
-65
max
6.0
6.0
6.0
14
±10
VD+0.3
VVD1+0.3
VP+0.3
VD+0.3
70
150
Units
V
V
V
V
mA
V
V
V
V
°C
°C
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(VSS=VVSS=0V; Note: 1)
Parameter
Symbol min typ
Power Supply (Note: 2)
VD 4.75 5.0
VVD1/VVD2
4.75
5.0
VP 11.4 12
Note: 2. Analog output voltage scales with the voltage of VD.
AOUT (typ@0dB) = 2Vrms × VD/5.
The VVD1 and VVD2 must be the same voltage.
*AKEMD assumes no responsibility for the usage beyond the conditions in this datasheet.
max Units
5.25 V
5.25 V
12.6 V
ELECTRICAL CHARACTERISTICS
(Ta = 25°C; VP=12V, VD = 5V; VVD1=VVD2 = 5V; fs = 48kHz; BICK = 64fs)
Power Supplies
Parameter
min typ max
Power Supply Current
Normal Operation (PDN pin = “H”; Note: 3)
VD
VVD1+VVD2
VD+ VVD1+VVD2
VP
Power-Down Mode (PDN pin = “L”; Note: 4)
VD
VVD1+VVD2
VP
14 -
46 -
- 120
6 12
10 100
10 100
10 100
Note: 3. STBY bit = “L”, all video outputs are active.
No signal, no load for A/V switches. fs=48kHz “0”data input for DAC.
Note: 4. All digital inputs including clock pins (MCLK, BICK and LRCK) are held at VD or VSS.
Units
mA
mA
mA
mA
μA
μA
μA
MS0451-E-01
- 11 -
2007/06
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4705.PDF ] | |
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