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GS3441 の電気的特性と機能

GS3441のメーカーはSemtechです、この部品の機能は「Extended Reach 3G/HD/SD Adaptive Cable Equalizer」です。


製品の詳細 ( Datasheet PDF )

部品番号 GS3441
部品説明 Extended Reach 3G/HD/SD Adaptive Cable Equalizer
メーカ Semtech
ロゴ Semtech ロゴ 




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GS3441 Datasheet, GS3441 PDF,ピン配置, 機能
GS3441
Extended Reach 3G/HD/SD Adaptive Cable Equalizer with Dual Outputs
Key Features
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
compliant
• Automatic cable equalization
• Multi-standard operation from 125Mb/s to 2.97Gb/s
• Performance optimized for 270Mb/s, 1.485Gb/s and
2.97Gb/s. Typical equalized length of Belden 1694A
cable up to:
Š 210m at 2.97Gb/s
Š 300m at 1.485Gb/s
Š 550m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Supports MADI at 125Mb/s
• Dual, independently-controlled outputs
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Cable Length Indicator (CLI) output; varies
monotonically with input cable length
• Automatic power-down on loss of signal
Š Standby power <35 mW (typical)
• Differential outputs support DC coupling from 1.2V to
3.3V CML logic
• Option to compensate for 6dB flat attenuation prior to
input of device
• Selectable output de-emphasis: 2dB, 4dB and 6dB
• Standard EIA/JEDEC logic control and status signal
levels
• Single 3.3V power supply operation
• 180mW (one output enabled), 212mW (both outputs
enabled) typical power consumption
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
• Pb-free and RoHS compliant
Applications
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
coaxial cable serial digital interfaces
Description
The GS3441 is a high-speed BiCMOS device designed to
equalize and restore signals received over 75Ω coaxial
cable.
The device is designed to support SMPTE ST 424,
SMPTE ST 292 and SMPTE ST 259, and is optimized for
performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s.
The GS3441 features DC restoration to compensate for the
DC content of SMPTE pathological signals.
The Carrier Detect output pin (CD) indicates whether an
input signal has been detected. It can be connected directly
to the SLEEP pin to enable automatic power-down upon
loss of carrier.
A voltage programmable threshold, set via the SQ_ADJ pin,
forces CD high when the input signal amplitude falls below
the threshold. This allows the GS3441 to distinguish
between low-amplitude SDI signals and noise at the input
of the device.
The equalizing and DC restore stages are disengaged and
no equalization occurs when the BYPASS pin is HIGH.
Setting the BYPASS pin HIGH is useful for signals launched
at the signal source with low data rates and/or slow rise/fall
times.
The GS3441 features a gain selection pin (GAIN_SEL) which
can be used to compensate for 6dB flat attenuation prior to
input of the device.
The differential outputs can be DC-coupled to Semtech’s
reclockers and cable drivers, as well as industry-standard
1.2V, 1.8V, 2.5V and 3.3V CML logic by changing the
voltage applied to the VCC_O pin. In general, DC-coupling
to any termination voltage between 1.2V and 3.3V is
supported.
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
1 of 25
Proprietary & Confidential

1 Page





GS3441 pdf, ピン配列
Contents
1. Pin Out...............................................................................................................................................................4
1.1 GS3441 Pin Assignment .................................................................................................................4
1.2 GS3441 Pin Descriptions ................................................................................................................4
2. Electrical Characteristics ............................................................................................................................7
2.1 Absolute Maximum Ratings ..........................................................................................................7
2.2 DC Electrical Characteristics ........................................................................................................7
2.3 AC Electrical Characteristics ..................................................................................................... 10
3. Input/Output Circuits ............................................................................................................................... 12
4. Detailed Description.................................................................................................................................. 14
4.1 Serial Digital Inputs ...................................................................................................................... 14
4.2 Automatic (Adaptive) Cable Equalization ............................................................................. 14
4.3 Differential Digital Data Outputs ............................................................................................. 14
4.4 Programmable Squelch Adjust (SQ_ADJ) .............................................................................. 15
4.5 Carrier Detect, Sleep, and Auto-Sleep .................................................................................... 15
4.6 GAIN_SEL ......................................................................................................................................... 16
4.7 Adjustable Output Swing, De-Emphasis and Mute ............................................................ 16
4.8 Cable Length Indicator (CLI) ...................................................................................................... 18
5. Application Information .......................................................................................................................... 19
5.1 High Gain Adaptive Cable Equalizers .................................................................................... 19
5.2 PCB Layout ....................................................................................................................................... 19
5.3 Typical Application Circuit ........................................................................................................ 20
6. Package & Ordering Information .......................................................................................................... 21
6.1 Package Dimensions ..................................................................................................................... 21
6.2 Packaging Data ............................................................................................................................... 21
6.3 Recommended PCB Footprint ................................................................................................... 22
6.4 Marking Diagram ........................................................................................................................... 22
6.5 Solder Reflow Profiles .................................................................................................................. 23
6.6 Ordering Information ................................................................................................................... 23
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
3 of 25
Proprietary & Confidential


3Pages


GS3441 電子部品, 半導体
Table 1-1: GS3441 Pin Descriptions (Continued)
Pin Number
Name
Timing
Type
19
VCC_O1
Analog
Power
20
OP1_CTL
Not
Synchronous
Input
21
OP1_EN
Input
22 CLI — Output
23
SLEEP
Not
Synchronous
Input
24
CD
Not
Synchronous
Output
Center Pad
Power
Description
Most positive power supply connection for the output buffer for
output 1.
Connect to 1.2 - 3.3V DC.
Controls the Output Swing, De-emphasis and Mute features of the
DDO/DDO outputs for Output 1.
When this pin is connected to GND, the output swing is 800mVppd
with no de-emphasis applied to the output signal.
With this pin connected to the 2.5V, the output is MUTED.
Intermediate voltages and functions are shown in Table 4-5. These
voltages can be achieved as shown in Figure 4-2 and Figure 4-3.
This pin has an internal pull-down resistor.
Output 1 Enable.
Please refer to the input logic parameter in the DC Electrical
Characteristics table for logic level threshold and compatibility.
When HIGH, Output 1 is operational.
When LOW, Output 1 is powered-down and the outputs are both at
VCC_O1.
This pin has an internal pull-up resistor.
Cable Length Indicator
SLEEP Control.
Please refer to the input logic parameter in the DC Electrical
Characteristics table for logic level threshold and compatibility. This
pin is a 2.5V input that is tolerant to 3.3V levels.
When HIGH the part is powered-down except for the Carrier Detect
function.
This pin may be connected directly to the CD pin to automatically
put the device to sleep (low-power operation) on loss of carrier.
This pin has an internal pull-down resistor.
Note: When SLEEP is connected to CD for automatic power
reduction on loss of carrier, the SQ_ADJ pin will not modify the CD
threshold. The CD threshold will revert to the default value used
when SQ_ADJ is pulled LOW.
Carrier Detect Status Output.
Please refer to the output logic parameter in the DC Electrical
Characteristics table for logic level threshold and compatibility. This
pin is a 2.5V output.
Indicates presence of an input signal. When the CD pin is LOW, a
signal has been detected at the input. When this pin is HIGH, it
indicates loss of input signal.
Internally bonded to VEE_A.
Connect to GND with at least 5 VIAs.
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
6 of 25
Proprietary & Confidential

6 Page



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部品番号部品説明メーカ
GS3440

Extended Reach 3G/HD/SD Adaptive Cable Equalizer

Semtech
Semtech
GS3441

Extended Reach 3G/HD/SD Adaptive Cable Equalizer

Semtech
Semtech


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