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PDF GS3441 Data sheet ( Hoja de datos )
| Número de pieza | GS3441 | |
| Descripción | Extended Reach 3G/HD/SD Adaptive Cable Equalizer | |
| Fabricantes | Semtech | |
| Logotipo |  |
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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:
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
• 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
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  
Table 1-1: GS3441 Pin Descriptions (Continued)
Pin Number
6, 7
Name
AGC, AGC
Timing
Analog
Type
—
8
BYPASS
Not
Synchronous
Input
9
SQ_ADJ
Analog
Input
10
OP2_EN
—
Input
11
OP2_CTL
Not
Synchronous
Input
12
13, 14
15
VCC_O2
DDO2,
DDO2
VEE_O2
Analog
Analog
Analog
Power
Output
Power
16
17, 18
VEE_O1
DDO1,
DDO1
Analog
Analog
Power
Output
Description
External AGC capacitor connection.
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 OPn_CTL pins via suitable resistor networks (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.
Output 2 Enable.
Please refer to the input logic parameter in the DC Electrical
Characteristics table for logic level threshold and compatibility.
When HIGH, Output 2 is operational.
When LOW, Output 2 is powered-down and the outputs are both at
VCC_O2.
This pin has an internal pull-down resistor.
Controls the Output Swing, De-emphasis and Mute features of the
DDO/DDO outputs for Output 2.
When this pin is connected to GND, the output swing is 850mVppd
with no de-emphasis.
With this pin connected to a 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.
Most positive power supply connection for the output buffer for
output 2.
Connect to 1.2 - 3.3V DC.
Serial digital differential output 2.
Most negative power supply connection for the output buffer for
output 2.
Connect to GND.
Most negative power supply connection for the output buffer for
output 1.
Connect to GND.
Serial digital differential output 1.
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
5 of 25
Proprietary & Confidential
5 Page 
Table 2-3: AC Electrical Characteristics (Continued)
VCC = +3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown
Parameter
Symbol Conditions
Min
Typ
Max
Units
Notes
Input Return Loss
– 5MHz - 1.485GHz
– 1.485GHz - 2.97GHz
15 –
10 –
– dB –
– dB –
Input Resistance
– single-ended
– 1.9 – kΩ –
Input Capacitance
– single-ended
– 1.3 – pF –
Output Resistance
– single-ended
– 50 – Ω –
Notes:
1. Device performance is optimized for standard data rates (SD = 270Mb/s, HD = 1.485Gb/s, 3G = 2.970Gb/s)
2. 0m cable length.
3. All parts are production tested. In order to guarantee jitter over the full range of specification (VCC_A = 3.3V ±5%, TA = -40°C to +85°C, and
720-880mVpp launch swing from the SDI cable driver) the recommended applications circuit must be used.
4. Based on validation data using the recommended applications circuit, at VCC_A = 3.3V, TA = -40°C to +85°C and 800mVpp launch swing from
the SDI cable driver.
5. GAIN_SEL = 0
GS3441 Extended Reach 3G/HD/SD Adaptive Cable
Equalizer with Dual Outputs
Final Data Sheet Rev. 1
GENDOC-056647 May 2013
www.semtech.com
11 of 25
Proprietary & Confidential
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet GS3441.PDF ] | |
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