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PDF ( 数据手册 , 数据表 ) TW6872

零件编号 TW6872
描述 Triple-Rate (SD/HD/3G) SDI Transmitter
制造商 Intersil
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TW6872 数据手册, 描述, 功能
Triple-Rate (SD/HD/3G) SDI Transmitter with VC-2
Encoder and Audio Decoder
TW6872
The TW6872 is a triple-rate (SD/HD/3G) SDI transmitter. It
receives parallel BT.656/BT.1120/ASI video data from a
CMOS sensor/ISP chip. It also receives analog audio, or serial
digital audio. The TW6872 serializes the video and audio into
an SDI stream and transmits it to an SDI receiver via its
integrated cable driver.
In addition to the standard SDI format with uncompressed raw
video data, TW6872 can optionally compress video with a
visually lossless VC-2 compression algorithm to send the video
formats normally running at HD rate (1.5Gbps) on the cable at
SD rate (270Mbps), and therefore achieve longer cable reach.
Together, the TW6872 and Intersil’s TW6874 SDI receiver
provide a complete end-to-end SDI link solution and can
operate with or without VC-2 compression. Integrated
audio/video test patterns and PRBS checker ease system
design and implementation.
The TW6872 is available in a 76 Ld QFN. It is specified for
operation over the -40°C to +85°C ambient temperature
range and operates on two power supplies: 1V and 3.3V. A
single 27MHz crystal is used for all supported audio/video
operating modes.
Applications
• SD/HD/3G-SDI Camera
Features
• Triple-rate (SD/HD/3G) SDI transmitter for Standard
Definition (SD) and High Definition (HD), and 3G 10-bit
component video
• Encoding SDI standard of ITU-R BT.656/SMPTE 259M
Level C, ITU-R BT.1120/SMPTE ST 292, SMPTE 424M 10-bit
parallel component video inputs into 10-bit serial video
output
• BT.656/BT.1120 interface for CMOS sensor/ISP chip
• Asynchronous Serial Interface (ASI) for IEC 13818-1
compliant transport streams
• Integrated 75Ω cable driver with pre/de-emphasis
• Integrated VC-2 encoder allows transmission of HD video
over SD transmission lengths
• Analog audio and I2S serial audio input interfaces over
ancillary field
• Digital audio with PCM encoding for embedding audio
samples into the audio ancillary field of SDI stream
• Single 27MHz clock/crystal input
• Optional clock output for use as the ISP chip’s clock input to
enhance overall jitter
• PRBS7/23 and video/audio pattern generator
• I2C for external micro-controller interface
• Low power consumption
• Small footprint LTZ-QFN76L (9mm x9mm) package
• Pb-free (RoHS compliant)
d
u
m
m
y
May 23, 2014
FN8616.0
1.0V 3.3V
CMOS
SENSOR
CLK
DATA
CLKO
ISP
21
VD
3 I2S
4.7k
4.7k
2.2µF
AIN0
2.2µF
AIN1
TW6872
HOST
PROCESSOR
IRQ
I2C
SDO
SDO
XTI
XTO
RSET
3.3V
75 
3.3V
75 
22pF
0 
open*
0 
open*
1µF
1µF
75
75
COAX
TW6874S
DI RX
d
u
m
m
y
27MHz
22pF
1.6k 
*Final RLN values pending optimization.
Place holder for inductor recommended.
AINN
2.2µF
FIGURE 1. TW6872 TYPICAL APPLICATION
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
I2C Bus™ is a trademark owned by NXP Semiconductors Netherlands, B.V. All other trademarks mentioned are the property of their respective owners.







TW6872 pdf, 数据表
TW6872
Absolute Maximum Ratings
Supply Pins
AVDD_SDO to AVSS_SDO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_MISC to AVSS_MISC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_ADCA to AVSS_ADCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_ADCD to AVSS_ADCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_PLL1 to AVSS_PLL1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_PLL2 to AVSS_PLL2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_PLL3 to AVSS_PLL3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
AVDD_PLLX4 to AVSS_PLLX4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
DVDDI to DVSSI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.2V
DVDDO to DVSSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V
Other Pins
Voltage on any Input Pin . . . . . . . . . . . . . . . . . . DVSSO-0.3 V to DVDDO V
SDO/SDOb Voltage. . . . . . . . . . . . . . . . . . . .AVSS_SDO V to AVDD_SDO V
XTI/XTO Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 1 V
AIN0/1/N Voltage . . . . . . . . . . . . . . . . . AVSS_ADCA V to AVDD_ADCA V
ESD Ratings
IEC 61000-4-2 (contact discharge) Analog Audio Pins . . . . . . . . . . . 6kV
Human Body Model (JEDEC JS-001-2011) all Pins . . . . . . . . . . . . . . 2kV
Charged Device Model (JESD22-C101) . . . . . . . . . . . . . . . . . . . . . . . 750V
Latch Up (Tested per JESD78; Class II, Level A) . . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
QFN Package (Notes 3, 4) . . . . . . . . . . . . . .
22
1.5
Power Dissipation. . . . . . . . . . . . . . . . . . . . . .See “Electrical Specifications”
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Ambient Operating Temperature . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
3. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
4. For JC, the “case temp” location is the center of the exposed pad on the package underside.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications DVDDI = 1.0V, AVDD_SDO = AVDD_MISC = AVDD_ADCD = AVDD_ADCA = AVDD_PLL1 = AVDD_PLL2 =
AVDD_PLL3 = AVDD_PLLX4 = DVDDO = 3.3V, TA = +25°C, unless otherwise specified.
PARAMETER
DESCRIPTION
TEST CONDITIONS
MIN
(Note 5)
MAX
TYP (Note 5) UNIT
POWER SUPPLY VOLTAGE
AVDD_SDO Analog SDO Driver Supply Voltage
3.0 3.3 3.6 V
AVDD_MISC Analog Misc Supply Voltage
3.0 3.3 3.6 V
AVDD_ADCA Analog ADC Supply Voltage
3.0 3.3 3.6 V
AVDD_ADCD Analog ADC Supply Voltage
3.0 3.3 3.6 V
AVDD_PLL1 Analog PLL Supply Voltage
3.0 3.3 3.6 V
AVDD_PLL2 Analog PLL Supply Voltage
3.0 3.3 3.6 V
AVDD_PLL3 Analog PLL Supply Voltage
3.0 3.3 3.6 V
AVDD_PLLX4 Analog PLL Supply Voltage
3.0 3.3 3.6 V
DVDDI
Digital Core Supply Voltage
0.9 1.0 1.1 V
DVDDO
Digital IO Supply Voltage
3.0 3.3 3.6 V
POWER DISSIPATION
I_AVDD
Analog Supply Current (Note 10)
(all AVDD_* tied together except SDO)
60 mA
I_AVDD_SDO Analog SDO Supply Current
60 mA
I_DVDDI
Digital Core Supply Current
90 mA
I_DVDDO Digital IO Supply Current
6 mA
PTOT
Total Power
505.8
mW
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FN8616.0
May 23, 2014







TW6872 equivalent, schematic
TW6872
FIGURE 10. SDO/SDOb OUTPUT SCHEMATIC
FIGURE 11. SDO/SDOb LAYOUT LAYER 1
Submit Document Feedback 16
FN8616.0
May 23, 2014










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