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GS1674 데이터시트 PDF




Semtech에서 제조한 전자 부품 GS1674은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 GS1674 기능
기능 Adaptive Cable Equalizer
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GS1674 데이터시트, 핀배열, 회로
GS1674
GS1674 Adaptive Cable Equalizer
The GS1674 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75Ω coaxial
cable. The device is optimized for performance at 270Mb/s and 1.485Gb/s, and features DC restoration to compensate for
the DC content of SMPTE pathological test patterns.
The Carrier Detect output pin (CD) indicates whether a valid input signal has been detected. It can be connected directly to
the MUTE pin to mute the output on loss of carrier. The sensitivity of the carrier detect can be easily programmed to allow
the GS1674 to distinguish between low-amplitude SDI signals and noise at the input of the device. The equalizing and DC
restore stages are disengaged when the BYPASS pin is HIGH. No equalization occurs in Bypass mode.
The GS1674 is footprint and drop-in compatible with existing GS1574A and LMH0044 designs, with no additional
application changes required.
Key Features
• Replaces the LMH0044
• SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
• Automatic cable equalization
• Performance optimized for 270Mb/s and 1.485Gb/s.
Typical equalized length of Belden 1694A cable:
Š 220m at 1.485Gb/s
Š 400m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Standard EIA/JEDEC logic control and status signal
levels
• Single 3.3V power supply operation
• 195mW power consumption (typical)
• Wide temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
• Drop-in compatible with the GS1574A. Forward
compatible with Gennum's 3G EQ products.
• Pb-free and RoHS compliant
Typical Application Circuit
CD
MUTE
VCC VCC
6.8nH*
SDI
75Ω
10nF
1µF
1µF
16 15 14 13
1
VEE_A
2 SDI
3
SDI
GS1674
VEE_D 12
11
SDO
10
SDO
10nF
75Ω 37.4Ω
4
VEE_A
9
VEE_D
4.7µF
+
+
4.7µF
56
78
1µF
SQ_ADJ
BYPASS
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
* Value dependent on layout
GS1674 Adaptive Cable Equalizer
Data Sheet
54168 - 2
September 2012
www.semtech.com
SDO
SDO
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GS1674 pdf, 반도체, 판매, 대치품
Table 1-1: GS1674 Pin Descriptions (Continued)
Pin Number
13
Name
VCC_D
Timing
Analog
Type
Power
14
MUTE
Not
Input
Synchronous
15 CD Not Output
Synchronous
16
VCC_A
Analog
Power
Center Pad
Power
NOTE:
For 3G migration, pins 4 and 9 are input select pins.
Description
Most positive power supply for the digital I/O pins of the device.
Connect to +3.3V DC.
CONTROL SIGNAL INPUT
levels are LVCMOS/LVTTL compatible. (3.3V Tolerant)
Controls output behaviour on SDO and SDO. (Internal pull-down).
See Section 3.4.
STATUS SIGNAL OUTPUT
Signal levels are LVCMOS/LVTTL compatible.
Indicates the presence of an input signal.
See Section 3.4.
Most positive power supply for the analog circuitry of the device.
Connect to +3.3V DC.
Internally bonded to VEE_A.
GS1674 Adaptive Cable Equalizer
Data Sheet
54168 - 2
September 2012
4 of 16

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GS1674 전자부품, 판매, 대치품
2.4 Typical Performance Curves
VCC=3.3V, room temperature, 800mV launch swing
600
400
200
0
0 100 200 300
Cable Length (m)
Figure 2-1: Jitter vs. Cable Length (270 Mb/s)
100
80
60
40
20
0
50 100
Cable Length (m)
Figure 2-2: Jitter vs. Cable Length (1485 Mb/s)
400
150
GS1674 Adaptive Cable Equalizer
Data Sheet
54168 - 2
September 2012
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