GS3140
Multi-Rate Adaptive 3G SDI
Equalizer
Key Features
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•
•
•
•
Multi-standard operation at rates between 1Mb/s and
2.97Gb/s
SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259
compliant
AES10 (MADI) compatible
Industry leading cable reach, with automatic cable
equalization for different lengths of cable
Performance optimized for 125Mb/s, 270Mb/s,
1.485Gb/s, and 2.97Gb/s. Typical equalized length of
Belden 1694A cable up to:
200m at 2.97Gb/s
280m at 1.485Gb/s
500m at 270Mb/s
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•
•
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3kV HBM ESD protection on all pins
Wide operating temperature range of -40ºC to +85ºC
Small footprint QFN–COL package
(16-pin, 4mm x 4mm)
Pb-free and RoHS compliant
Pin-compatible with the GS6140
Applications
•
SMPTE ST 424, SMPTE ST 292, SMPTE ST 259 and AES10
coaxial cable serial digital interfaces
Description
The GS3140 is a high-speed BiCMOS device designed to
equalize and restore signals received over cable.
The device is designed to support SMPTE ST 424, SMPTE ST
292, SMPTE ST 259 and AES10 (MADI), and it is optimized
for performance at 125Mb/s, 270Mb/s, 1.485Gb/s, and
2.97Gb/s.
The device supports MADI serial signals at 125Mb/s with
peak-to-peak launch amplitude between 300mV
ppd
and
600mV
ppd
(with AES10 spec rise and fall times) and
800mV
ppd
±10% (with SD-SDI rise and fall times).
The GS3140 features DC restoration to compensate for the
DC content of SMPTE pathological signals.
Loss of Signal (LOS) is detected when the input carrier is lost
or signal amplitude falls below a programmable threshold.
This is further processed by a filter programmable up to
1.6s before LOS status is asserted. The device can be
programmed to automatically sleep/mute/disable the
output on loss of signal.
An interrupt pin (INT) indicates LOS by default, and can be
programmed to signal various other statuses.
When the BYPASS control bit is set, the equalizing and DC
restore stages are disengaged. This is useful for signals
launched at the source with low data rates and/or slow rise
and fall times.
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•
1.8V core power supply
Typical power consumption of 84mW when
DC-coupled at 1.2V with OUTPUT_SWING = 0011
b
(see
Table 4-2)
Ultra-low power mode for shorter cable reach
applications
Upstream launch swing compensation from 250mV
ppd
to 1V
ppd
in approximately 50mV
ppd
steps (Default
750mV
ppd
)
Auto/Manual bypass (useful for low data rates with
slow rise/fall times)
Robust, noise-immune signal detection with squelch
threshold adjustment
Auto/Manual control of SLEEP/MUTE/DISABLE OUTPUT
modes
Data Rate detection and indication
<MADI, MADI, SD, HD, 3G differentiation
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Digital cable length indication (CLI)
Differential output supports DC-coupling from
1.2V to 2.5V CML logic and AC-coupling for other logic
families
Programmable/Rate-dependent output de-emphasis
level and delay
Host interface for status and control
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•
GS3140
Final Data Sheet
PDS-060939
www.semtech.com
Rev.1
May 2015
1 of 40
Semtech
Proprietary & Confidential
The differential output can be DC-coupled to Semtech’s
reclockers and cable drivers, as well as industry-standard
+1.2V, +1.8V and +2.5V CML logic by changing the voltage
applied to the VCC_O pin.
The GS3140 also features programmable output
de-emphasis with eight user-selectable operating levels to
support long PCB traces at the output of the device. The
output swing can be programmed, via the user interface,
from approximately 250mV
ppd
to 1V
ppd
in 50mV
ppd
steps.
INT
CS
SCLK
The device comes in a 16-pin, 4mm x 4mm QFN–COL
package.
Power consumption of the GS3140 is typically 84mW when
DC-coupled to a +1.2V termination voltage with
OUTPUT_SWING = 0011
b
(see
Table 4-2).
The GS3140 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
SDIN
SDOUT
VCC_A
Control and Status
VCC_O
SDI
Equalizer
SDI
DC Restore
Output Trace
Driver
DDO
DDO
VCC_D
VEE_A
AGC
VEE_O
AGC
AGC
GS3140 Functional Block Diagram
GS3140
Final Data Sheet
PDS-060939
www.semtech.com
Rev.1
May 2015
2 of 40
Semtech
Proprietary & Confidential
Revision History
Version
1
0
ECO
025657
024058
PCN
—
—
Date
May 2015
January 2015
Changes and/or Modifications
Converted document from Draft Data Sheet to Final Data Sheet.
New Document.
Contents
1. Pin Out.................................................................................................................................................................5
1.1 GS3140 Pin Assignment ...................................................................................................................5
1.2 GS3140 Pin Descriptions ..................................................................................................................5
2. Electrical Characteristics................................................................................................................................7
2.1 Absolute Maximum Ratings ...........................................................................................................7
2.2 DC Electrical Characteristics ...........................................................................................................7
2.3 AC Electrical Characteristics ............................................................................................................9
3. Input/Output Circuits.................................................................................................................................. 11
4. Detailed Description.................................................................................................................................... 12
4.1 Serial Digital Inputs (SDI/SDI) ...................................................................................................... 12
4.1.1 Upstream Launch Swing Compensation.................................................................... 12
4.2 Automatic (Adaptive) Cable Equalization .............................................................................. 12
4.3 Cable Length Indication ................................................................................................................ 13
4.4 Programmable Squelch Threshold ........................................................................................... 13
4.5 Loss of Signal (LOS) ......................................................................................................................... 14
4.5.1 Programmable LOS Filter ................................................................................................. 14
4.6 Rate Detection .................................................................................................................................. 15
4.7 Interrupt (INT)/ Status Output .................................................................................................... 15
4.8 Power Modes .................................................................................................................................... 15
4.8.1 Bypass...................................................................................................................................... 15
4.8.2 Sleep......................................................................................................................................... 15
4.8.3 Mute ......................................................................................................................................... 16
4.8.4 Sleep-Mute............................................................................................................................. 16
4.8.5 Output Disable ..................................................................................................................... 16
4.9 Serial Digital Output (DDO/DDO) .............................................................................................. 16
4.9.1 Adjustable Output Swing and De-Emphasis............................................................. 17
4.9.2 Output Common Mode Voltage.................................................................................... 18
4.10 Device Reset .................................................................................................................................... 19
4.11 Gennum Serial Peripheral Interface (GSPI) .......................................................................... 19
4.11.1 CS Pin..................................................................................................................................... 19
4.11.2 SDIN Pin................................................................................................................................ 20
4.11.3 SDOUT Pin ........................................................................................................................... 20
4.11.4 SCLK Pin................................................................................................................................ 22
4.11.5 Command Word Description........................................................................................ 22
GS3140
Final Data Sheet
PDS-060939
www.semtech.com
Rev.1
May 2015
3 of 40
Semtech
Proprietary & Confidential
4.11.6 GSPI Transaction Timing................................................................................................. 24
4.11.7 Single Read/Write Access............................................................................................... 25
4.11.8 Auto-increment Read/Write Access ........................................................................... 27
4.11.9 Default GSPI Operation................................................................................................... 28
4.11.10 Setting a Device Unit Address ................................................................................... 29
5. Host Interface Register Map...................................................................................................................... 30
6. Application Information............................................................................................................................. 36
6.1 Typical Application Circuit ........................................................................................................... 36
7. Package & Ordering Information ............................................................................................................ 37
7.1 Package Dimensions ...................................................................................................................... 37
7.2 Packaging Data ................................................................................................................................. 38
7.3 Recommended PCB Footprint .................................................................................................... 38
7.4 Marking Diagram ............................................................................................................................. 39
7.5 Solder Reflow Profiles .................................................................................................................... 39
7.6 Ordering Information ..................................................................................................................... 39
GS3140
Final Data Sheet
PDS-060939
www.semtech.com
Rev.1
May 2015
4 of 40
Semtech
Proprietary & Confidential
1. Pin Out
1.1 GS3140 Pin Assignment
SDOUT
14
16
15
VCC_A
SDI
SDI
VEE_A
VCC_D
13
12
INT
CS
1
2
3
4
5
6
7
8
VCC_O
DDO
DDO
VEE_O
GS3140
16-pin QFN–COL
(top view)
11
10
9
AGC
SDIN
Figure 1-1: GS3140 Pin Out
1.2 GS3140 Pin Descriptions
Table 1-1: GS3140 Pin Descriptions
Pin Number
1
2, 3
4
5, 6
7
8
Name
VCC_A
SDI, SDI
VEE_A
AGC, AGC
SDIN
SCLK
SCLK
AGC
Type
Power
Input
Power
Analog I/O
Digital Input
Digital Input
Description
Most positive power supply connection for the input buffer and core.
Connect to 1.8V.
Serial digital differential input.
Most negative power supply connection for the input buffer and core.
Connect to GND.
External Automatic Gain Control capacitor.
Host Interface Serial Data Input.
Host Interface Serial Clock Input.
Most negative power supply connection for the output buffers, digital
IO and digital circuits.
Connect to GND.
9
VEE_O
Power
10, 11
12
DDO, DDO
VCC_O
Output
Power
Serial digital differential output.
Most positive power supply connection for the output buffer.
Connect to 1.2V - 2.5V.
GS3140
Final Data Sheet
PDS-060939
www.semtech.com
Rev.1
May 2015
5 of 40
Semtech
Proprietary & Confidential
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