Vishay – 8-Channel Precision Multiplexer With Low 3.2 Ω On-Resistance and 17 μA Power Consumption

Product Benefits:

  • Features eight single-ended channels
  • Low on-resistance of 3.2 Ω typical
  • Low power consumption of 17 μA
  • Fully specified at ± 15 V, +12 V, and ± 5 V
  • Low source OFF capacitance of 23 pF and drain ON capacitance of 121 pF
  • Low charge injection of 120 pC typical
  • Operates from a single 4.5 V to 24 V power supply, or from dual ± 4.5 V to ± 15 V power supplies
  • Up to 250 mA continuous current
  • Fast switching times
  • Break-before-make operation
  • Enable function
  • No VL logic supply required
  • 0.8 V and 2 V logic thresholds ensure low-voltage TTL/CMOS compatibility
  • Typical on-resistance flatness of 0.5 Ω
  • Bi-directional
  • Supports analog signals up to the supply voltage when on, and blocks them when off
  • Available in the QFN16 4 mm by 4 mm package
  • RoHS compliant
  • Halogen free

 Market Applications:

  • Signal switching and relay replacement in data acquisition
  • medical and healthcare equipment
  • industrial control and automation
  • sample and hold circuits
  • test and measurement equipment and communication
  • battery powered and A/V systems

 The Key Specifications:

  • Analog signal range: ± 15 V
  • 35 V max. supply rating
  • On-resistance: 3.2 Ω
  • On-resistance flatness: 0.5 Ω
  • Channel-to-channel on-resistance matching: 0.2 Ω
  • Power consumption (@ 5 V): 17 μA
  • Power supply:
    • Single: 4.5 V to 24 V
    • Dual: ± 4.5 V to ± 15 V
  • CS(OFF): 23 pF
  • CD(ON): 121 pF
  • Charge injection: 120 pC
  • Temperature range: -40°C to +125°C

The Perspective:

Compared to previous generation and competing analog switches with similar on-resistance in the same footprint, the DG1408 offers 25 % lower on-resistance, 10 % lower drain parasitic capacitance, and up to 30 % lower charge injection. In addition, the device’s new CMOS platform ensures low and flat resistance over the full signal range, providing excellent linearity and low signal distortion.

  • The DG1408 enhances the design of accurate gain amplifiers with improved circuit bandwidth and lower sensitivity to leakage.
  • Improving linearity and enhancing signal fidelity, the low and flat on-resistance minimizes insertion loss and errors caused by changes in the input signal. In addition, low on-resistance makes the DG1408 the preferred solution over mechanical relays, eliminating mechanical bounce and reducing the overall solution size.
  • New CMOS technology enables low parasitic capacitance of 121 pF even though the switch on-resistance is low. In addition, it improves power consumption dramatically to 17 μA over
  • the full range. The nearest competing device offers 220 μA.
  • The low drain ON capacitance helps create a stable amplifier circuit. Drain ON capacitance causes phase shift to the amplifier close loop response, and when it is too large, the amplifier circuit
  • may become unstable and oscillate. Low drain capacitance, together with low on-resistance, also improves data acquisition rate and accuracy.
  • The DG1408’s fast switching time is ideal for circuits requiring low time constants.
  • The DG1408 integrates special design logic circuits that achieve low-voltage logic control over the full operating voltage range. The device doesn’t require an extra power rail for logic circuits, and can interface with 1.8 V logic control directly without level shift circuitry or drivers.
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