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TLA2024: Need more info on tolerances

M.A.M
Expert 8555 points
Part Number: TLA2024
Other Parts Discussed in Thread: ADS1015, ADS1115

Hi,

My important customer cannot find many electrical tolerances described for full temp range, all gain levels, or all data rates, but only for +25C, +/-2V and 128 SPS.

- Can you please help him to clarify the chip better in order for him to assess its usefulness for a PTC100/PTC1000 reading application?

He has four questions. His own words:

" Several essential datasheet specifications of the TLA2024 are applicable only to one particular data rate, one particular FSR setting and at room temperature.

In order to predict the IC's performance under real usage conditions, I need a bit more information according to the following questions:

 

7.5 Electrical Characteristics

General datasheet conditions: minimum and maximum specifications apply from TA = –40°C to +85°C; typical specifications are at TA = 25°C; all

specifications are at VDD = 3.3 V, data rate = 128 SPS, and FSR = ±2.048 V (unless otherwise noted)

 

SYSTEM PERFORMANCE

  • Datasheet specification, min: Resolution (no missing codes) 12 Bits.
    Question 1: This hopefully applies to all gain settings and not only to the overall mentioned one, even though it is not "otherwise noted" - or?

  • Datasheet specification, typ: INL Integral nonlinearity(2) 1 LSB
    Datasheet specification, typ: Offset error ±1 LSB
    Datasheet specification, typ: Offset drift 0.01 LSB/°C
    Datasheet specification, typ: Gain error(3) 0.05%
    Datasheet specification, typ: Gain drift(3) 10 ppm/°C
    Question 2: What are the specifications for the other modes than 128 SPS and FSR = ±2.048 V ?
    Question 3: Are the room-temperature tolerances 3- or 6-sigma widths in normal distributions or something else?
    Question 4: Which numbers apply to these tolerance parameters over the full operational temperature range (all modes, 3- or 6-sigma)?

"

Thanks.

B.r, M.A.M

  • 0
    TI__Guru* 93725 points

    M.A.M.,


    The TLA2024 is a cost-optimized device where the number and speed of production tests were minimized. Generally, I would take the typical value of the specification as a value similar to the mean+standard deviation.

    In regards to the first question, the 12-bit resolution applies to all gain settings. However, for the rest of the questions, we only give typical values and these values apply to the operational temperature of the device.

    For a similar device with more minimum and maximum specifications, I would look at the ADS1015 and the 16-bit ADS1115, which should have similar behavior.


    Joseph Wu