Multi-Channel PCIe Gen 4 Linear Equalizer

PTN3944

PTN3944 is a high-performance multi-channel (x4) linear equalizer that is optimized for PCIe 4.0, UPI and similar high-speed interfaces. PTN3944 addresses high-speed signal quality enhancement requirements for implementation of PCIe and UPI interfaces.

The device provides programmable linear equalization, output swing linearity control by pin strapping or I2C control to improve signal integrity and enable channel extension by reducing Inter-Symbol Interference (ISI). The equalizer supports use across a variety of channel conditions. PTN3944 supports entering into deep standby state using an I2C register write.

PTN3944 is powered from a 1.8 V supply. It is available in a small high performance HWFLGA36 package.

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Block Diagram

PTN3944 Block Diagram

PTN3944 Block Diagram
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Features

System Features

  • Supports PCIe Gen1 (2.5 Gbps) x4, Gen2 (5 Gbps) x4, Gen3 (8 Gbps) x4, and Gen4 (16 Gbps) x4
    • Peaking gain up to 18.3 dB at 8 GHz
    • Output swing linearity control: 500 mVppd to 950 mVppd
    • Flat gain of +0.7 dB or -0.7 dB
  • Configurable via I2C interface (supports 16 target addresses)
  • Supports maximum voltage limit (Vvoltage_jump) to align to the latest system platform capabilities
  • Integrated termination resistors provide impedance matching on both transmit and receive sides
  • RX equalizers on all high-speed channels to compensate for signal attenuation
  • Good linearity over the frequency band (DC to Nyquist frequency) and input voltage dynamic range
  • Differential input/output return loss performance < -15 dB up to 8 GHz
  • Flow-through pin-out to ease PCB layout and minimize crosstalk effects
    • Very low crosstalk: DDNEXT < -60 dB up to 8 GHz
    • Very low crosstalk: DDFEXT < -50 dB up to 8 GHz
  • Low active current consumption for output swing linearity control of 950 mVppd
    • Single channel: 62 mA (typ)
    • Two channels: 125 mA (typ)
    • Four channels: 250 mA (typ)
  • Power Supply 1.7 V to 1.9 V
  • Small high performance HWFLGA36 package
  • ESD HBM 1.5 kV, CDM 1 kV
  • Operating temperature range -20 °C to +85 °C

USB Redriver Products

PTN38007  New PTN3944  New PTN38003A  New PTN3816  New PTN36502 PTN36043A PTN36241G PTN36001
Features Combo USB4 20 Gbps TBT3, DP 2.0, USB3 Linear redriver PCIe Gen4 16 Gbps 4-channel Linear equalizer Combo USB3/DP 1.4 10 Gbps Linear redriver DP 1.4/DP 2.0 4-lane 20 Gbps Linear redriver Combo USB 5 Gbps DP 1.2 Limiting redriver USB 5 Gbps Limiting redriver USB 5 Gbps Limiting redriver USB 5 Gbps Limiting redriver
Port Configuration 4 : 4 4-Channel 4 : 4 4-lane 4 : 4 1 x 2 Single Port Single Port
Power Supply 1.8 V 1.8 V 1.8 V 1.8 V 1.8 V 1.8 V 1.8 V 1.8 V
Rx equalizer TX De-Emphasis Control I2C I2C I2C GPIO I2C and GPIO GPIO GPIO GPIO
Power Consumption (all lanes active at highest data rate) 450 mW 450 mW 450 mW 450 mW 405 mW 203 mW 189 mW 200 mW
Package HWFLGA36
2.1 x 6.0 x 0.6 mm,
0.4 mm pitch		 HWFLGA36
2.1 x 6.0 x 0.6 mm,
0.4 mm pitch		 HWFLGA36
2.1 x 6.0 x 0.6 mm,
0.4 mm pitch		 HWFLGA36
2.1 x 6.0 x 0.6 mm,
0.4 mm pitch		 DXHQFN24
2.4 x 2.0 x 0.35 mm,
0.4 pitch 		DXHQFN18
2.4 x 2.0 x 0.35 mm,
0.4 pitch 		X2QFN12
2.4 x 2.0 x 0.35 mm,
0.4 pitch 		X2QFN12
2.4 x 2.0 x 0.35 mm,
0.4 pitch
Target Application Computing Enterprise Server Mobile / Computing Computing Mobile Mobile Mobile Computing

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