can I get 3 wires 's 4-20mA output with PGA309 and XTR115?

weiming zhang

Other Parts Discussed in Thread: XTR115, PGA309, XTR111, XTR110

we have had 2 wires 4-20mA output sensor products using PGA309 and XTR115.

but now some clients want 3 wires 4-20mA output.could you give me some advices? is it possible to get 3 wires 4-20mA output using using PGA309 and XTR115?

over 10 years ago

0 Shrikant Lokhande over 10 years ago

Intellectual 655 points

Weiming,

As I understand from your statement is that earlier you have given 2 wire interface, VCC and 4-20mA output as per xtr115 datasheet.

But I couldnt make out which will be your third wire?

Is it Ground or 0V?

Regards

Shrikant L

0 weiming zhang over 10 years ago in reply to Shrikant Lokhande

Intellectual 270 points

thanks for your relpy.

yes.the 3rd wire is Ground.

is that ok if I use xtr111 to replace xtr115? do you have other better solution?

thank you.

0 Hawk Tong over 10 years ago in reply to weiming zhang

TI__Intellectual 1840 points

Weming,

Recommend XTR111 as 3 wires voltage to current converter, in this case, PGA309+EEPROM+Resistance Bridge can draw more 4mA quiescent current.

I am wondering why you intend use 3 wires current loop tranducer ? the resistance of bridge consumes too much crrent right ?

regards

Hawk Tong

0 Ian Williams over 10 years ago in reply to Hawk Tong

TI__Mastermind 27715 points

Hi Weiming,

You can use the XTR110 or XTR111 to achieve a 3-wire current loop output with the PGA309. The XTR111 is a lower-cost option, with a voltage regulator instead of a reference and no internal resistors to create an internal 4mA offset shift. You can still achieve the offset using the regulator, or the internal reference of the PGA309, along with two discrete resistors.

Best regards,

Ian Williams
Linear Applications Engineer
Precision Analog - Op Amps

0 Shrikant Lokhande over 10 years ago in reply to weiming zhang

Intellectual 655 points

I have developed similar application using xtr110 and accuaracy is also very good.

It seems XTR111 can also be used for the same application.

Also refer this link:

http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/135705/495398.aspx#495398

Regards

Shrikant L

0 weiming zhang over 10 years ago in reply to Hawk Tong

Intellectual 270 points

the client wants 3 wires 4-20mA output .

but our products are 2 wires 4-20mA output.

0 Collin Wells over 10 years ago in reply to weiming zhang

TI__Guru 62915 points

Hello Weiming,

While there are some products available from other component manufacturers that can be used as both 2 and 3-wire 4-20mA transmitter, all of the 4-20mA products from TI are dedicated 2 or 3-wire transmitters. If your customer needs a 3-wire output please follow the advice of Hawk, Ian, or Shrikant above and use the XTR110 or XTR111 with the PGA309.

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can I get 3 wires 's 4-20mA output with PGA309 and XTR115?