What is Current Consumption of ADM3053 at lower data rates?

I found ADM3053 supply current is quiet high (when compared to the other IC's without Iso Power) as per the datasheet spec,

Seems like Driver circuit alone consumes more than other similar devices in market without Iso power.
Typical                              Max.

29mA - Recessive          36mA

195mA - Dominant          232mA

@ RL = 60 ohms and Rs = 0(minimum)

I hope this is the worst case current consumption, and at 1Mbps data rate, and maximum slope.

I see a huge difference between the other CAN transceivers like MCP2551 which consumes only 75mA at dominant state, and 10 mA at Recessive

If the Iso power current is 29mA at Recessive state (Typical data), I can assume it consume few more current for the oscillator circuitry, Iso-power circuit losses etc.

why such a huge difference at dominant state. why would driver consume 166mA more at dominant state with 60 ohm load.

As per datasheet VCAN H can be 4.5V max and VCANL is 2.0 V max then current consumed with RL = 60 ohms should not exceed 75mA+33mA = 108mA.

So I would expect atleast the current consumption does not exceed 140mA. But typcal is 195mA is wat mentioined in datasheet?

Not understandable can any body explain?

What will be the current consumption if I reduce the speed by 8 times, and control the slope by having a Rs according to my speed requirements.

will the current consumption come down significantly? Do we get any tested data/graph with speed?

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  • 0
    •  Analog Employees 
    on Mar 11, 2015 4:51 PM

    Hi Kannan,

    When comparing the ADM3053 current consumption, the MCP2551 or other non-isolated CAN parts are not the best match. The ADM3051 is our non-isolated CAN transceiver best match.

    For example;

    ADM3051 NON-ISOLATED CAN TRANSCEIVER
    Supply current: 78mA maximum (Dominant), 10 maximum (Recessive). RSLOPE = 47 kΩ

    MCP2551 NON-ISOLATED CAN TRANSCEIVER
    Supply current: 75mA maximum (Dominant), 10 maximum (Recessive). RSLOPE = 47 kΩ


    For your question about the typical current and reduced data rates, please see these plots;

    ADM3053 Data sheet, page 9, Figure 5:
    Supply Current, ICC vs. Data Rate
    ADM3053 Data sheet, page 11, Figure 18:
    Supply Current ICC vs. Temperature
    TxD/RxD Data Rate 1 Mbps, RL = 60 Ω

    Regards,

    Richard

Reply
  • 0
    •  Analog Employees 
    on Mar 11, 2015 4:51 PM

    Hi Kannan,

    When comparing the ADM3053 current consumption, the MCP2551 or other non-isolated CAN parts are not the best match. The ADM3051 is our non-isolated CAN transceiver best match.

    For example;

    ADM3051 NON-ISOLATED CAN TRANSCEIVER
    Supply current: 78mA maximum (Dominant), 10 maximum (Recessive). RSLOPE = 47 kΩ

    MCP2551 NON-ISOLATED CAN TRANSCEIVER
    Supply current: 75mA maximum (Dominant), 10 maximum (Recessive). RSLOPE = 47 kΩ


    For your question about the typical current and reduced data rates, please see these plots;

    ADM3053 Data sheet, page 9, Figure 5:
    Supply Current, ICC vs. Data Rate
    ADM3053 Data sheet, page 11, Figure 18:
    Supply Current ICC vs. Temperature
    TxD/RxD Data Rate 1 Mbps, RL = 60 Ω

    Regards,

    Richard

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