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We are in the process of designing a PCB based on the TI reference design - TIPD126_SCH_revA. The PGA309 will communicate with a 8051 mcu on I2C for access to the eeprom registers. The Vout will be read by an ADS1110, also with I2C.
Internal Vref: 2.5V
Internal Vexc: 2.075V
Course Gain: -8.500mV (calculator)
FE PGA Gain: 128 (calculator)
Zero Dac: 1.140V (calculator)
Gain DAC: 642.570m (calculator)
BE PGA Gain: 6 (calculator)
4-20 mA circuit:
R4 + R5 = (Vout_max - Vout_min) / (Iin_max – Iin_min)
= (1.224 – 0.2) / (0.0002 – 0.00004)
= 1.024 / 0.00016
R4 = 3.16Kohm
R5 = 3.24Kohm
Iin_min = Vout_min / (R4 + R5)
= 0.2 / 6.4Kohm
Iref = 0.00004 - 0.00003125
R2 = 2.5 / 0.00000875
C10 = 1 / (2 * pi * R4 * 1.41) * 1000
fc_act = 1 / (2 * pi * R4 * c10) * 1000
I have some questions regarding the design:
Ian WilliamsLinear Applications EngineerPrecision Analog - Op Amps
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In reply to Ian Williams:
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