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PDF AK4702EQ Data sheet ( Hoja de datos )
| Número de pieza | AK4702EQ | |
| Descripción | 2ch DAC | |
| Fabricantes | Asahi Kasei Microsystems | |
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ASAHI KASEI
[AK4702EQ]
AK4702EQ
2ch DAC with AV SCART switch
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, I2S
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
MS0424-E-00
-1-
2005/09
1 page  
ASAHI KASEI
[AK4702EQ]
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 MONOIN
29 VCROUTR
30 VCROUTL
31 TVOUTR
32 TVOUTL
33 MONOOUT
34 VP
35 DVCOM
36 PVCOM
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
I MONO Input Pin
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.
MS0424-E-00
-5-
2005/09
5 Page 
ASAHI KASEI
[AK4702EQ]
FILTER CHARACTERISTICS (AUDIO)
(Ta = 25°C; VP=10.0∼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: 12)
PB
0
21.77
kHz
-6.0dB
- 24.0 - kHz
Stopband
(Note: 12)
SB
26.23
kHz
Passband Ripple
PR
± 0.06
dB
Stopband Attenuation
SA 54
dB
Group Delay
(Note: 13)
GD
-
19.1
- 1/fs
Digital Filter + LPF
Frequency Response 0 ∼ 20.0kHz
FR - ± 0.5 - dB
Note: 12. The passband and stopband frequencies scale with fs (system sampling rate).
ex.) PB=0.4535×fs (@±0.05dB), SB=0.546×fs.
Note: 13. The calculating delay time which occurred by digital filtering. This time is from setting the 16/18bit data of
both channels to input register to the output of analog signal.
ANALOG CHARACTERISTICS (VIDEO)
(Ta = 25°C; VP=12V, VD = 5V; VVD1=VVD2 = 5V; VVOL1/0= “00” unless specified.)
Parameter
Conditions
min typ
Sync tip clamp
0.7
voltage at output
Chrominance bias
2.2
voltage at output
Gain
Input=0.3Vp-p, 100kHz
5.5 6
RGB Gain
Input=0.3Vp-p, 100kHz VVOL1/0= “00”
5.5 6
VVOL1/0= “01”
6.7 7.2
VVOL1/0= “10”
7.7 8.2
VVOL1/0= “11”
8.6 9.1
Interchannel Gain
Mismatch
Frequency response
Input impedance
Input Signal
Load Resistance
Load Capacitance
Input=0.3Vp-p, 100kHz (Note: 14)
Input=0.3Vp-p, Response at 6MHz
Chrominance input (internally biased)
f=100kHz, maximum with distortion < 1.0%,
gain=6dB.
Except RFV pin (Note: 15)
RFV pin (Note: 16)
C1 (Note: 15)
C2 (Note: 15, Note: 16)
-0.3
-1
40
-
150
20k
-
-0.5
60
-
-
-
Dynamic Output
Signal
Y/C Cross talk
S/N
Differential Gain
Differential Phase
f=100kHz, maximum with distortion < 1.0%
f=4.43MHz, 1Vp-p input. Among TVVOUT,
TVRC, VCRVOUT and VCRC outputs.
Reference Level = 0.7Vp-p, CCIR 567 weighting.
BW= 15kHz to 5MHz.
0.7Vpp 5steps modulated staircase.
chrominance &burst are 280mVpp, 4.43MHz.
0.7Vpp 5steps modulated staircase.
chrominance &burst are 280mVpp, 4.43MHz.
-
-
-
-
-
-
-50
74
+0.4
+0.8
max Units
V
V
6.5 dB
6.5 dB
7.7 dB
8.7 dB
9.6 dB
0.3 dB
dB
- kohm
1.5 Vpp
- ohm
- ohm
400 pF
15 pF
3 Vpp
- dB
- dB
-%
- Degree
MS0424-E-00
- 11 -
2005/09
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4702EQ.PDF ] | |
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