NOT RECOMMENDED FOR NEW DESIGNS
Contact our Technical Support Center at
1-888-INTERSIL or www.intersil.com/tsc
DATASHEET
FN7735
Rev. 1.00
May 19, 2017
TW2815
4-Channel Video Decoders and Audio Codecs
for Security Applications
The TW2815 includes four high quality NTSC/PAL video decoders that convert analog composite video signal to
digital component YCbCr data for security application. The TW2815 contains four 10-bit ADC and proprietary clamp
and gain controllers and uses 4H comb filter for separating luminance & chrominance to reduce cross noise artifacts.
The TW2815 adopts the image enhancement techniques such as IF compensation filter, CTI , and programmable
peaking. The TW2815 also includes audio CODEC which has four audio Analog-to-Digital converters and one
Digital-to-Analog converter. A built-in audio controller can generate digital outputs for recording/mixing and accepts
digital input for playback.
Features
Four Video Decoders
Accepts all NTSC(M/N/4.43) / PAL(B/D/G/H/I/K/L/M/N/60) standards with auto detection
Integrated four video analog anti-aliasing filters and 10 bit CMOS ADCs
High performance adaptive 4H comb filters for all NTSC/PAL standards
IF compensation filter for improvement of color demodulation
Color Transient Improvement (CTI)
Automatic white peak control
Programmable hue, saturation, contrast, brightness and sharpness
Proprietary fast video locking system for non-realtime application
Supports the standard ITU-R BT.656 format or time multiplexed output with 54MHz
Provides simultaneous four channel Full D1 and CIF time-multiplexed outputs with 54MHz
Integrated four audio ADCs and one audio DAC
Provides multi-channel audio mixed analog output
Supports a standard I2S interface for record output and playback input
8/16 bit audio word length
Sample audio with 8/16KHz
Supports a two-wire serial host interface
Ultra low power consumption (Typical 500mW)
100 TQFP package
FN7735 Rev. 1.00
May 19, 2017
Page 1 of 82
TW2815
Table of Contents
Block Diagram _______________________________________________________________________ 4
Pin Diagram _________________________________________________________________________ 5
Pin Description _______________________________________________________________________ 6
Functional Description _________________________________________________________________ 8
Video Input Formats ________________________________________________________________ 8
Analog-to-Digital Converter __________________________________________________________ 9
Sync Processing ___________________________________________________________________ 10
Automatic Gain Control and Clamping ________________________________________________ 10
Horizontal Sync Processing _________________________________________________________ 10
Vertical Sync Processing ___________________________________________________________ 10
Color Decoding ____________________________________________________________________ 11
Decimation Filter _________________________________________________________________ 11
Y/C Separation ___________________________________________________________________ 12
Luminance Processing ______________________________________________________________ 13
Chrominance Processing ____________________________________________________________ 14
Chrominance Demodulation _________________________________________________________ 14
ACC (Automatic Color gain control) __________________________________________________ 15
Chrominance Gain, Offset and Hue Adjustment _________________________________________ 15
CTI (Color Transient Improvement) __________________________________________________ 15
Video Cropping ___________________________________________________________________ 16
Output Format ____________________________________________________________________ 18
ITU-R BT.656 Format _____________________________________________________________ 18
Two Channel ITU-R BT.656 Time-multiplexed Format with 54MHz ________________________ 19
Four Channel CIF Time-multiplexed Format with 54MHz _________________________________ 20
Extra Sync Output ________________________________________________________________ 22
Output Enabling Act _______________________________________________________________ 23
Audio Codec ______________________________________________________________________ 24
Audio Detection __________________________________________________________________ 25
Multi-Chip Operation ______________________________________________________________ 25
Serial Audio Interface _____________________________________________________________ 27
Host Interface _______________________________________________________________________ 30
Serial Interface ____________________________________________________________________ 30
Interrupt Interface _________________________________________________________________ 31
FN7735 Rev. 1.00
May 19, 2017
Page 2 of 82
TW2815
Control Register ___________________________________________________________________ 32
Register Map ____________________________________________________________________ 32
Recommended Value ______________________________________________________________ 35
Register Description _______________________________________________________________ 37
Electrical Information ________________________________________________________________ 74
Absolute Maximum Ratings _________________________________________________________ 74
Recommended Operating Conditions __________________________________________________ 74
DC Electrical Parameters ___________________________________________________________ 75
AC Electrical Parameters ___________________________________________________________ 76
Decoder Performance Parameter _____________________________________________________ 79
Recommended Schematic ______________________________________________________________ 80
Package Dimension ___________________________________________________________________ 81
Revision History _____________________________________________________________________ 82
_______________________________________________________________________________ 82
FN7735 Rev. 1.00
May 19, 2017
Page 3 of 82
TW2815
Block Diagram
VIN1
ADC
AIN1
ADC
Decimation Filter
BT.656
Interface
4H Comb
Video Decoder
VD1[7:0]
VD2[7:0]
VD3[7:0]
VD4[7:0]
MPP1
MPP2
MPP3
MPP4
CLKPO
CLK54I
CLKNO
SCLK
SDAT
IRQ
ACLKR
ASYNR
ADATR
ADATM
ACLKP
ASYNP
ADATP
VIN2
ADC
4H Comb
Video Decoder
Decimation Filter
AIN2
ADC
VIN3
ADC
4H Comb
Video Decoder
Decimation Filter
AIN3
ADC
VIN4
ADC
4H Comb
Video Decoder
Decimation Filter
AIN4
ADC
AOUT
DAC
Interpolation Filter
FN7735 Rev. 1.00
May 19, 2017
I2S
Interface
Host
Interface
Clock
Generator
MPP
Interface
Page 4 of 82
TW2815
Pin Diagram
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
SADD[1]
SADD[0]
VDDA
AOUT
VSSA
VSSA
AIN2
AIN3
AIN4
AIN1
VDDA
VDDV
VIN1
VSSV
VSSV
VIN2
VDDV
VDDV
VIN3
VSSV
VSSV
VIN4
VDDV
TEST
RSTB
VSS
ADATP
ASYNP
VDDI
ACLKP
ADATM
VSS
ADATR
ASYNR
VDDO
ACLKR
VD1[0]
VSS
VD1[1]
VD1[2]
VDDI
VD1[3]
VD1[4]
VSS
VD1[5]
VD1[6]
VDDO
VD1[7]
MPP1
VSS
TW2815
100TQFP(12x12)
VDDI
VD2[0]
VD2[1]
VSS
VD2[2]
VD2[3]
VSS
VD2[4]
VD2[5]
VD2[6]
VDDO
VD2[7]
MPP2
CLK54I
VDDI
CLKNO
CLKPO
VD3[0]
VSS
VD3[1]
VD3[2]
VSS
VD3[3]
VD3[4]
VDDI
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
FN7735 Rev. 1.00
May 19, 2017
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
VSS
SCLK
SADT
VDDI
IRQ
MPP4
VSS
VD4[7]
VD4[6]
VDDO
VD4[5]
VD4[4]
VSS
VD4[3]
VD4[2]
VDDI
VD4[1]
VD4[0]
VSS
MPP3
VD3[7]
VDDO
VD3[6]
VD3[5]
VSS
Page 5 of 82
电子竞赛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
