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GS1574-CTE3

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
www.gennum.com
GS1574 HD-LINX® II
Adaptive Cable Equalizer
GS1574 Data Sheet
28854 - 5 May 2007 1 of 18
Features
• SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
• Automatic cable equalization
• Multi-standard operation from 143Mb/s to
1.485Gb/s
• Supports DVB-ASI at 270Mb/s
• Small footprint (4mm x 4mm)
• Pb-free and RoHS Compliant
• Pin compatible with the GS9074 Cable Equalizer
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Performance optimized for 270Mb/s and 1.485Gb/s
• Typical maximum equalized length of Belden
1694A cable: 140m at 1.485Gb/s, 350m at 270Mb/s
•50Ω differential output (with internal 50Ω pull-ups)
• Manual output mute or programmable mute based
on max cable length adjust
• Single 3.3V power supply operation
• Operating temperature range: 0°C to +70°C
Applications
• SMPTE 292M, SMPTE 344M and SMPTE 259M
Coaxial Cable Serial Digital Interfaces.
Description
The GS1574 is a second-generation high-speed bipolar
integrated circuit designed to equalize and restore
signals
received over 75
Ω
co-axial cable
.
The GS1574 is designed to support SMPTE 292M,
SMPTE 344M and SMPTE 259M, and is optimized for
performance at 270Mb/s and 1.485Gb/s.
The GS1574 features DC restoration to compensate for
the DC content of SMPTE pathological test patterns.
A voltage programmable mute threshold (MCLADJ) is
included to allow muting of the GS1574 output when an
approximate selected cable length is reached for
SMPTE 259M signals. This feature allows the GS1574
to distinguish between low amplitude SD-SDI signals
and noise at the input of the device. The serial digital
outputs of the GS1574 may be forced to a mute state by
applying a voltage to the MUTE pin.
Power consumption is typically 270mW using a 3.3V
power supply. The GS1574 is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents
are RoHS compliant.
GS1574 Functional Block Diagram
CABLE LENGTH ADJUSTOR
CARRIER DETECT
MUTE
EQUALIZER DC RESTORE OUTPUT
AGC
MUTE
SDO
BYPASS
SDOSDI
SDI
MCLADJ
GS1574 Data Sheet
28854 - 5 May 2007 2 of 18
Contents
Features ........................................................................................................................1
Applications...................................................................................................................1
Description ....................................................................................................................1
1. Pin Out ......................................................................................................................3
1.1 GS1574 Pin Assignment .................................................................................3
1.2 GS1574 Pin Descriptions ................................................................................3
2. Electrical Characteristics...........................................................................................5
2.1 Absolute Maximum Ratings ............................................................................5
2.2 DC Electrical Characteristics ..........................................................................5
2.3 AC Electrical Characteristics ...........................................................................6
2.4 Solder Reflow Profiles .....................................................................................7
3. Input / Output Circuits ...............................................................................................9
4. Detailed Description ................................................................................................11
4.1 Serial Digital Inputs .......................................................................................11
4.2 Cable Equalization ........................................................................................11
4.3 Programmable Mute Output ..........................................................................12
4.4 Mute ..............................................................................................................12
5. Application Information............................................................................................13
5.1 PCB Layout ...................................................................................................13
5.2 Typical Application Circuit A .........................................................................13
5.3 Typical Application Circuit B .........................................................................14
6. Package & Ordering Information.............................................................................15
6.1 Package Dimensions ....................................................................................15
6.2 Land Information ...........................................................................................16
6.3 Packaging Data .............................................................................................16
6.4 Marking Diagram ...........................................................................................17
6.5 Ordering Information .....................................................................................17
7. Revision History ......................................................................................................18
GS1574 Data Sheet
28854 - 5 May 2007 3 of 18
1. Pin Out
1.1 GS1574 Pin Assignment
Figure 1-1: 16-Pin QFN
1.2 GS1574 Pin Descriptions
GS1574
(top view)
1
V
EE_A
V
EE_A
SDI
SDI
2
3
4
SDO
SDO
V
EE_D
VEE_D
12
11
10
9
AGC
AGC
BYPASS
MCLADJ
5
7
68
VCC_A
MUTE
NC
V
CC_D
13
14
15
16
Center Pad
(bottom of package, internally
bonded to VEE_A)
Table 1-1: GS1574 Pin Descriptions
Pin Number Name Timing Type Description
1, 4 VEE_A Analog Power Most negative power supply for analog circuitry.
Connect to analog GND.
2, 3 SDI, SDI
Analog Input Serial digital differential input.
5, 6 AGC, AGC
Analog – External AGC capacitor.
Connect pin 5 and pin 6 together as shown in Typical Application Circuit
A.
7 BYPASS Not
Synchronous
Input Forces the Equalizing and DC RESTORE stages into bypass mode
when HIGH. No equalization occurs in this mode.
8 MCLADJ Analog Input Maximum cable length adjust.
Adjusts the approximate maximum amount of cable to be equalized
(from 0m to the maximum cable length). The output is muted (latched to
the last state) when the maximum cable length is achieved.
NOTE: MCLADJ is only recommended for data rates up to 360Mb/s.
For data rates above this, MCLADJ should be left floating.
9 VEE_D Analog Power Most negative power supply for the digital circuitry and output buffer.
Connect to digital GND.
10, 11 SDO
, SDO Analog Output Equalized serial digital differential output.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

GS1574-CTE3

Mfr. #:
Buy GS1574-CTE3
Manufacturer:
Semtech
Description:
Equalizers QFN-16 Pin Taped (250/reel)
Lifecycle:
New from this manufacturer.
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