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PDF GS3440 Data sheet ( Hoja de datos )
| Número de pieza | GS3440 | |
| Descripción | Extended Reach 3G/HD/SD Adaptive Cable Equalizer | |
| Fabricantes | Semtech | |
| Logotipo |  |
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GS3440
Extended Reach 3G/HD/SD Adaptive Cable Equalizer
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:
210m at 2.97Gb/s
300m at 1.485Gb/s
550m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Supports MADI at 125Mb/s
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Automatic power-down on loss of signal
Standby power <35mW (typical)
• Differential output supports 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 power consumption (typical)
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
Footprint compatible with the GS2974A, GS2974B,
GS2984 and GS2994
• Pb-free and RoHS compliant
Applications
• SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
coaxial cable serial digital interfaces
Description
The GS3440 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 GS3440 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 sleep on 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 GS3440 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 GS3440 features a gain selection pin (GAIN_SEL) which
can be used to compensate for 6dB flat attenuation prior to
the input of the device.
The differential output 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.
The GS3440 also features programmable output
de-emphasis with three, user-selectable operating levels to
support long PCB traces at the output of the device.
GS3440 Adaptive Cable Equalizer
Final Data Sheet
Rev. 2
December 2012
www.semtech.com
1 of 23
Proprietary and Confidential
1 page  
Table 1-1: GS3440 Pin Descriptions (Continued)
Pin Number
Name
Timing
Type
7
BYPASS
Not
Synchronous
Input
8
SQ_ADJ
Analog
Input
9
OP_CTL
Not
Synchronous
Input
10, 11
12
13
DDO, DDO
VEE_O
Analog
Analog
VCC_O
Analog
Output
Power
Power
14
SLEEP
Not
Synchronous
Input
Description
Core Bypass 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.
Forces the equalizer and DC-restore stages into Bypass mode when
HIGH. No equalization occurs in this mode.
This pin has an internal pull-down resistor.
Squelch Threshold Adjust.
Adjusts the input signal amplitude threshold of the carrier detect
function. The serial data output of the device can be muted when
the serial data input signal amplitude is too low by connecting the
CD and OP_CTL pins using a suitable resistor network (see Figure 4-2
and Figure 4-3).
This pin has an internal pull-down resistor.
Note: The SQ_ADJ function is only available when the device is not
in auto-sleep mode. Reference Section 4.5 for more detail.
Controls the Output Swing, De-emphasis and Mute Features of the
DDO/DDO outputs.
When this pin is connected to GND, the output swing is 850mVppd
with no de-emphasis applied to the output signal.
With this pin connected to 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.
Serial digital differential output.
Most negative power supply connection for the output buffer.
Connect to GND.
Most positive power supply connection for the output buffer.
Connect to 1.2V - 3.3V DC.
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 can 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.
GS3440 Adaptive Cable Equalizer
Final Data Sheet
Rev. 2
December 2012
5 of 23
Proprietary and Confidential
5 Page 
3. Input/Output Circuits
VCC_A
SDI
VCC_A
2kΩ
2kΩ 2kΩ
RC RC
2.625kΩ
VCC_A
SDI
VCC_A
SQ_ADJ
+
-
82.4kΩ
Figure 3-1: Input Circuit
VCC_O
VCC_O
Figure 3-2: SQ_ADJ Circuit
VCC_O
DDO
50Ω
50Ω
DDO
Figure 3-3: Output Circuit
GS3440 Adaptive Cable Equalizer
Final Data Sheet
Rev. 2
December 2012
11 of 23
Proprietary and Confidential
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet GS3440.PDF ] | |
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