TLV9004: Output offset too big @ V_in_diff = 0V

Ciao,

I just implemented 20 PCBs based on the sboa247 application note, but using the below values (based on the schematic at page 1):

IC = TLV9004IDR (SOIC-14)

V+ = Vex = 3.3 V

V- = 0 V (GND)

Vref = 574.6 mV

G = 434,65 V/V

R11 = 93.1 Ohm 1% tollerance

R4=R2 = 20 k Ohm 1% tollerance

R2=R3 = 4.99 k Ohm 1% tollerance

R8 =17.4 Ohm 1% tollerance

R5=R6=R7=R10 = 350 Ohm --> Strain gauges full bridge

R9 = 23.2 Ohm 1% tollerance

The circuit simulated in TINA-TI (with the TLV9002 op. amp. instead the TLV9004) works fine.

My problem is the output offset with zero input voltage from the Wheatstone bridge. Below you can read the measured values of "Vo - Vref" in the 20 PCBs (in milli Volts)

-387,6
-266,6
-249,6
-199,6
-141,6
-109,6
-107,6
-104,6
-64,6
-41,6
7,4
20,4
162,4
179,4
251,4
445,4
494,4
529,4
617,4
710,4

My questions are:

• Do you think the TLV9004 is the wrong component for this applcation ?
• In the application note, you set the gain at 1001V/V using the TLV9002, how big was your output offset error in the sboa247 application note ?

Thanks in advance for your help,

Marco