GS6042-INE3 6G UHD-SDI/3G/HD/SD Adaptive Cable Equalizer - Datasheet Summary

Manufacturer: Semtech (Gennum Products)

Part Number: GS6042-INE3

Revision: Rev.4 (September 2015)

Package: Pb-free 16-pin QFN (4mm x 4mm), single unit packaging (non-tape/reel)

Operating Temperature Range: -40°C to +85°C

Compliance: Pb-free, RoHS compliant (no halogenated flame retardant in encapsulation)

1. Key Features

• Supports data rates from 125Mb/s to 6.25Gb/s, compliant with SMPTE ST 2081 (proposed), ST 424, ST 292, ST 259; also supports DVB-ASI (270Mb/s) and MADI (125Mb/s).
• Automatic adaptive cable equalization with typical Belden 1694A cable reach: 80m @5.94Gb/s, 210m @2.97Gb/s, 300m @1.485Gb/s, 500m @270Mb/s.
• Manual equalizer bypass control, programmable carrier detect with squelch threshold adjustment (SQ_ADJ pin).
• Automatic power-down (sleep mode) on loss of input signal; sleep mode power consumption is only 35mW (180mW typical in normal operation).
• Differential output supports DC-coupling to +1.2V to +3.3V CML logic via VCC_O pin adjustment.
• Optional 6dB flat band input gain (GAIN_SEL pin) and selectable output de-emphasis (2dB, 6dB, 8dB) via OP_CTL pin.
• Standard EIA/JEDEC logic for all control and status signals; single +3.3V core power supply operation.
• PCB footprint compatible with Semtech GS2974A, GS2974B, GS2984, GS2994, GS3440.
• Integrates DC restoration for SMPTE pathological signal compensation and carrier detect (CD) output for signal presence indication.

2. Electrical Characteristics

2.1 Absolute Maximum Ratings

• Supply Voltage (Core/Output Driver): -0.5V to +3.6V DC
• Input ESD Voltage (HBM): 5kV
• Storage Temperature: -50°C to +125°C
• Input Voltage Range: -0.3V to (VCC_A +0.3)V
• Solder Reflow Temperature: 260°C

2.2 DC Electrical Characteristics (VCC_A = +3.3V ±5%, -40°C ≤ TA ≤85°C)

• Core Supply Voltage (VCC_A): 3.135V (min) – 3.465V (max)
• Output Driver Supply Voltage (VCC_O): 1.2V/2.5V/3.3V ±5%
• Power Consumption (PD): 180mW (VCC_O=1.2V, 425mVppd swing); 240mW (max, VCC_O=3.3V, 850mVppd swing); 35mW (sleep mode)
• Input Logic Levels (GAIN_SEL/BYPASS/SLEEP): VIH=1.7V (min), VIL=0.7V (max) (2.5V pins, 3.3V tolerant)
• CD Output Voltage: VCD(OH)=2.0V (min, no signal), VCD(OL)=0.4V (typ, signal present)
• Input Common Mode Voltage (VCMIN): 1.7V (typ)

2.3 AC Electrical Characteristics (VCC_A = +3.3V ±5%, -40°C ≤ TA ≤85°C)

• Serial Input Data Rate (DRDDO): 125Mb/s (min) – 6250Mb/s (max)
• Input Voltage Swing (ΔVSDI): 720–950mVppd (270Mb/s/1.485Gb/s); 720–880mVppd (2.97Gb/s/5.94Gb/s)
• Output Voltage Swing (ΔVDDO): 350–500mVppd (low swing); 700–1000mVppd (high swing) @100Ω differential load
• Output Jitter: ≤0.5UI (max) at maximum supported Belden 1694A cable lengths for all data rates
• Output Rise/Fall Time (tr/tf): 75ps (5.94/2.97/1.485Gb/s); 150ps (270Mb/s) (20%–80%)
• Input Return Loss: ≥15dB (5MHz–1.485GHz); ≥10dB (1.485GHz–2.97GHz)
• Single-ended Impedance: Input 1.9kΩ (typ), Output 50Ω (typ); Input Capacitance: 1.3pF (typ)

3. Pinout & Pin Functions (16-pin QFN, Top View)

The device features a central ground pad (internally bonded to VEE_A, requires ≥5 vias to GND) and key functional pins as follows:

表格

Key Programmable Pin Modes

• GAIN_SEL: 0 = no gain; 1 = 6dB flat band gain
• SLEEP: 0 = normal operation; 1 = sleep mode (CD remains active)
• OP_CTL: 9 analog levels for swing (425/850mVppd), de-emphasis (0/2/6/8dB) and mute (2.416–2.5V)
• CD & SQ_ADJ: CD directly connects to SLEEP for auto-sleep (SQ_ADJ disabled in this mode)

4. Core Functional Blocks

• Serial Digital Input (SDI) stage with differential/single-ended support (AC-coupling recommended)
• Adaptive cable equalizer (inverse frequency response of Belden 1694A cable)
• DC restoration stage for pathological signal compensation
• AGC (Automatic Gain Control) with external capacitor connection
• Programmable squelch adjust (SQ_ADJ) for carrier detect threshold
• Differential output driver (DDO) with adjustable swing/de-emphasis/mute
• Carrier detect (CD) and sleep control with auto-sleep capability
• Power management for normal/sleep mode operation

5. Application Information

5.1 Target Applications

• SMPTE ST 2081/424/292/259 coaxial cable serial digital interfaces
• Serialized 8b/10b encoded video streams up to 6.25Gb/s (6G UHD-SDI, 3G-SDI, HD-SDI, SD-SDI)
• Professional video equipment (routers, transmitters, receivers, video processors)
• DVB-ASI and MADI audio/video serial interfaces

5.2 PCB Layout Guidelines

• Use controlled impedance transmission lines for PCB traces >1cm (FR-4 dielectric acceptable)
• Match high-speed trace width to SMT component width to minimize reflections
• Curve high-speed traces to avoid impedance changes
• Cut inner layers under input/output components to reduce parasitic capacitance
• Connect central ground pad to VEE_A with ≥5 vias for thermal and electrical performance

5.3 Recommended Circuits

• Extended Cable Reach Circuit: Optimized for maximum Belden 1694A cable support, with AC-coupled SDI input and configurable termination.
• Drop-in Replacement Circuit: Footprint-compatible with Semtech’s legacy equalizers (GS2974A/B, etc.), with 75Ω single-ended SDI input termination.

6. Packaging & Ordering

6.1 Package Specifications

• Type: 4mm x 4mm 16-pin QFN (JEDEC M0220)
• Moisture Sensitivity Level (MSL): 1
• Thermal Resistance: θJC=31.0°C/W (junction to case); θJA=43.8°C/W (junction to air, zero airflow)
• Psi, W: 11.0°C/W

6.2 Related Part Numbers (Same Die, Different Packaging)

• GS6042-INTE3: Pb-free 16-pin QFN (250pcs, tape and reel)
• GS6042-INTE3Z: Pb-free 16-pin QFN (2500pcs, tape and reel)All variants operate at -40°C to +85°C.

6.3 Solder Reflow Profile (Pb-free)

• Preheat: 60–150s (temperature ramp ≤3°C/sec)
• Reflow: 20–40s at ≥217°C, peak temperature 260°C (max)
• Total reflow time (≥200°C): ≤60–180s; total process time ≤8min
• Cool down ramp ≤6°C/sec

7. Revision History

• 0 (Jun 2013): New document release
• 1 (Nov 2013): Added 6.25G support, updated jitter characteristics and general content
• 2 (Feb 2014): Converted to Final Data Sheet, modified Section 4.3, added 6G SMPTE standard reference
• 3 (May 2014): Corrected de-emphasis level values
• 4 (Sep 2015): Added tape and reel options to ordering information (Table 6-2)

8. Important Notices

• The device is not designed/authorized for life-support, nuclear, or high-risk applications where failure may cause personal injury, property damage or environmental harm.
• Semtech reserves the right to modify product specifications and documentation without prior notice.
• All sales follow Semtech’s standard terms and conditions; product performance is warranted to published specifications at the time of sale.