GS1675 Datasheet, PDF (1/37 Pages) Gennum Corporation – Differential inputs and outputs

GS1675 SD/HD SDI Reclocker
The GS1675 is a multi-rate serial digital reclocker designed to automatically recover the embedded clock from a digital video signal and
retime the incoming video data. It will recover the embedded clock signal and retime the data from a SMPTE 292M or SMPTE 259M-C
compliant digital video signal.
The GS1675 can operate in either Auto or Manual rate selection mode. In Auto mode, the device will automatically detect and lock onto
incoming SMPTE SDI data signals at SD and HD data rates. For single-rate data systems, the GS1675 can be configured to operate in
Manual mode. In both modes, the device requires only one external crystal to set the VCO frequency when not locked, and provides
adjustment-free operation. In systems which require passing non-SMPTE data rates, the GS1675 can be configured to either
automatically or manually enter a bypass mode in order to pass the signal without reclocking.
The GS1675 accepts industry-standard differential input levels including LVPECL and CML. The differential data and clock outputs
feature selectable output swing via the host interface, ensuring compatibility with most industry-standard, terminated differential
receivers. The GS1675 features dual differential outputs. The second output can be configured to emit either the recovered clock signal
or the re-timed video data.
Key Features
• SMPTE 292M and SMPTE 259M-C compliant
• Supports DVB-ASI at 270Mb/s
• Single-supply operation at 3.3V or 2.5V
• 180mW typical power consumption (213mW with RCO
enabled) at 2.5V
• 2:1 input multiplexer patented technology
• Choice of dual reclocked data outputs or one reclocked data
output and one clock output
• Uses standard 27MHz crystal
• Differential inputs and outputs
Š supports DC-coupling to industry-standard differential
logic
Š on-chip 100Ω differential data input/output termination
Š selectable 400mVppd or 800mVppd output swing on
each output
• 4-wire SPI host interface for device configuration and
monitoring
• Standard logic control and status signal levels
• Auto and Manual modes for rate selection
• Standards indication in Auto mode
• Lock Detect Output
• Mute, Bypass and Autobypass functions
• SD/HD indication output to control GS1678 or GS1679 cable
drivers
• Operating temperature range: -40°C to +85°C
• 32 pin 5mm x 5mm QFN package
• Pb-free and RoHS compliant
• Forward pin-compatible with the Gennum's 3G GS2965
reclocker
•
Typical Application Circuit
GS1675 SD/HD SDI Reclocker
Data Sheet
54174 - 1
June 2011
VCC2
JP5
VCO_SEL
2
R23
VCC_VCO
(Pin9)
422R
1
R24
VCC2
267R
C33 C31 C30
10u 1u 10n
VEE_VCO
(Pin10)
C34
220n
GND
U2
GND
VDD_DIG
(Pin14)
C32
10n
VSS_DIG
(Pin15)
VCC_DDO1
(Pin19)
VCC_DDO0
(Pin23)
C20 C23 C27 C13 C15 C16
10n DNPDNP 10n DNPDNP
VEE_DDO1
(Pin20)
VEE_DDO0
(Pin24)
VCC_CP
(Pin32)
C7
10n
VEE_CP
(Pin31)
GND
Data Input 0
Data Input 1
HIFb
CSb
SPI
SCK
SDO
SDI
C3
47n
3 _DDI0
5
DDI0
DDO0 ²²
21
DDO0
6 _DDI1
DDO1/RCO ¹⁸
7 _DDI1
DDO1/RCO ¹⁷
4 _HIF
GS1675
27
28
29
30
CS
SCK
SDO
SDI
XTAL- ²⁶
25
XTAL+
8
1
2
NC
LF+
CP_CAP
SD/HD
16
13
LOS 12
LOCKED
C4
220n
GND
GND
Data Output 0
Data Output 1
ABM7-27.000MHZ-D2Y-T
R6 Y1
C1
18p
1M
GND
C2
SD/HD
LOS
LOCKED
18p
GND
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