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AD8120:  Triple Skew-Compensating Video Delay Line with Analog and Digital Control

The AD8120 is a triple broadband skew delay compensation IC that corrects for time mismatch of video signals incurred by transmission in unshielded twisted pairs of Category-5 and Category-6 type cables. Skew between the individual pairs exists in most types of multi-pair UTP cables due to the different twist-rates used for each pair in order to minimize crosstalk among the pairs. Some pairs are ...More

AD8120:  Triple Skew-Compensating Video Delay Line with Analog and Digital Control

Product Description

The AD8120 is a triple broadband skew delay compensation IC that corrects for time mismatch of video signals incurred by transmission in unshielded twisted pairs of Category-5 and Category-6 type cables. Skew between the individual pairs exists in most types of multi-pair UTP cables due to the different twist-rates used for each pair in order to minimize crosstalk among the pairs. Some pairs are therefore longer than others, and in long cables, the difference in propagation time between two pairs can be well into the tens of nanoseconds.

The AD8120 contains three delay paths which provide broadband delays up to 50 nanoseconds, in 0.8 ns increments, using 64 digital control steps or analog control adjustment. The delay technique used in the AD8120 minimizes noise and offset at the outputs. It has a broad bandwidth that ranges between 106 MHz and 152 MHz, depending upon the delay setting. This high output bandwidth capability makes AD8120 ideal in applications that receive high-resolution video over UTP cables.

The logic circuitry inside the AD8120 provides for individual delay control of each path. The three delay times can be independently set using a standard four-wire SPI bus, standard I2C bus or by applying three analog control voltages to the VCR, VCG, and VCB pins. Analog control offers a simple solution for systems that do not have digital control available, the simplest being potentiometer control.

The AD8120 is designed to be used with the AD8123 triple UTP equalizer in video-over-UTP applications, but can be used in other applications where similar controllable broadband delays are required.

The AD8120 is available in a 5 mm × 5 mm 32-lead LFCSP package and is rated to operate over the industrial temperature range of -40°C to +85°C.

Applications

  • Keyboard-video-mouse (KVM)
  • Digital signage
  • RGB video over UTP cable
  • Professional video projection and distribution
  • HD video
  • Security video
  • General broadband delay lines

    • Data Sheet, Rev PrA, 10/2008

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    • Corrects for unshielded twisted pair (UTP) cable delay skew
    • Delay of up to 50 ns per channel
    • High speed
      200 MHz BW @ VOUT = 1.4 V p-p and 0 ns delay
      150 MHz BW @ VOUT = 1.4 V p-p and 50 ns delay
    • Excellent channel-to-channel matching
      30 mV offset matching RTI
      0.8% gain matching
    • Low output offset
      ±30 mV RTI
      No external circuitry required to correct for offsets
    • Independent red, green, and blue delay controls
    • Drives 4 double-terminated video loads
    • Digital and analog delay control
      6-bit SPI bus
      I2C bus
      Analog voltage control
    • See data sheet for additional features

    Functional Block Diagram for AD8120

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    AD8051 110MHz 170V/µs 1V/V Yes 68 16nV/rtHz 3V to 12V 5.5 Rail-to-Rail, Single Supply SOIC, SOT $0.86
    AD8052 110MHz 170V/µs 1V/V Yes 68 16nV/rtHz 3V to 12V 11 Rail-to-Rail, Single Supply SOIC, SOP $1.62
    AD8091 110MHz 170V/µs 1V/V Yes 71 16nV/rtHz 3V to 12V 5.5 Rail-to-Rail, Single Supply SOIC, SOT $0.70
    AD8092 110MHz 170V/µs 1V/V Yes 71 16nV/rtHz 3V to 12V 11 Rail-to-Rail, Single Supply SOIC, SOP $0.90
    AD829 120MHz 230V/µs 1V/V No n/a 1.7nV/rtHz 9V to 36V 6.5 Comp Pin, Null DIP, LCC, SOIC $2.52
    ADA4851-4 130MHz 375V/µs 1V/V Yes 83 10nV/rtHz 2.7V to 12V 12.8 Rail-to-Rail, Single Supply SOP $1.10
    ADA4851-2 130MHz 375V/µs 1V/V Yes 83 10nV/rtHz 2.7V to 12V 6.4 Rail-to-Rail, Single Supply SOP $0.70
    AD8054 150MHz 145V/µs 1V/V Yes 68 16nV/rtHz 3V to 12V 13.6 Single Supply SOIC, SOP $2.88
    AD8044 160MHz 190V/µs 1V/V Yes 75 16nV/rtHz 3V to 12V 13.6 Rail-to-Rail, Single Supply DIP, SOIC $4.00
    AD8041 170MHz 170V/µs 1V/V Yes 72 16nV/rtHz 3V to 12V 6.5 Disable, Power Down, Rail-to-Rail, Single Supply DIP, SOIC $1.95
    AD8042 170MHz 225V/µs 1V/V Yes 73 15nV/rtHz 3V to 12V 14 Rail-to-Rail, Single Supply DIP, SOIC $2.05
    ADA4850-1 175MHz 220V/µs 1V/V Yes 81 10nV/rtHz 2.7V to 6V 2.9 Power Down, Rail-to-Rail, Single Supply CSP $0.56
    ADA4850-2 175MHz 220V/µs 1V/V Yes n/a 10nV/rtHz 2.7V to 6V 5.6 Disable, Power Down, Rail-to-Rail, Single Supply CSP $0.70
    AD8019 175MHz 400V/µs 1V/V No 78 8nV/rtHz 8V to 24V 21 Power Down, Single Supply SOIC, SOP $3.10
    ADA4856-3 225MHz 800V/µs n/a Yes n/a 14nV/rtHz 3V to 5.5V 23.4 Disable, Power Down, Rail-to-Rail, Single Supply CSP $1.39
    AD8036 240MHz 1.2kV/µs 1V/V No 66 6.7nV/rtHz 6V to 12V 21.5 Clamp Amp DIP, SOIC $3.46
    AD8047 250MHz 750V/µs 1V/V No 61 5.2nV/rtHz 6V to 12V 6.6 n/a DIP, SOIC $2.53
    AD8079 260MHz 800V/µs 1V/V No 65 2nV/rtHz 6V to 12V 11.5 Buffer SOIC $4.56
    AD8055 300MHz 1.4kV/µs 1V/V No 72 6nV/rtHz 8V to 12V 6.5 n/a DIP, SOIC, SOT $0.86
    AD8056 300MHz 1.4kV/µs 1V/V No 72 6nV/rtHz 8V to 12V 12 n/a DIP, SOIC, SOP $1.62
    ADA4862-3 310MHz 830V/µs 1V/V No 81 10.6nV/rtHz 5V to 12V 20.5 Disable, Power Down, Single Supply SOIC $0.96
    AD8063 320MHz 650V/µs 1V/V Yes 77 8.5nV/rtHz 2.7V to 8V 9.5 Disable, Power Down, Rail-to-Rail, Single Supply SOIC, SOT $0.86
    AD8061 320MHz 650V/µs 1V/V Yes 77 8.5nV/rtHz 2.7V to 8V 9.5 Rail-to-Rail, Single Supply SOIC, SOT $0.86
    AD8062 320MHz 650V/µs 1V/V Yes 77 8.5nV/rtHz 2.7V to 8V 19 Rail-to-Rail, Single Supply SOIC, SOP $1.62
    AD9631 320MHz 1.3kV/µs 1V/V No 72 7nV/rtHz 6V to 12V 18 n/a DIP, SOIC $3.81
    AD8057 325MHz 1.15kV/µs 1V/V No 85 7nV/rtHz 3V to 12V 7.5 Single Supply SOIC, SOT $0.86
    AD8058 325MHz 1.15kV/µs 1V/V No 85 7nV/rtHz 3V to 12V 15 Single Supply SOIC, SOP $1.62
    AD8038 350MHz 425V/µs 1V/V No 90 8nV/rtHz 3V to 12V 1.5 Disable, Power Down, Single Supply SC70, SOIC $0.86
    AD8039 350MHz 425V/µs 1V/V No 90 8nV/rtHz 3V to 12V 3 Single Supply SOIC, SOT $1.21
    AD8021 490MHz 150V/µs 1V/V No 93 2.1nV/rtHz 4.5V to 24V 7.7 Comp Pin, Disable, Power Down, Single Supply SOIC, SOP $1.31
    ADA4860-1 520MHz 790V/µs 1V/V No 90 4nV/rtHz 5V to 12V 8 Disable, Power Down, Single Supply SOT $0.56
    AD8074 600MHz 1.6kV/µs 1V/V No 80 19.5nV/rtHz 9V to 11V 30 Buffer, Disable, Power Down, Single Supply SOP $2.22
    ADA4861-3 730MHz 680V/µs 1V/V No 85 3.2nV/rtHz 5V to 12V 20.5 Power Down, Single Supply SOIC $0.96
    AD8045 1GHz 1350V/µs 1V/V No 102 3nV/rtHz 3.3V to 12V 16 - CSP, SOIC $1.41
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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