L9780 datasheet(24/56 Pages) STMICROELECTRONICS

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Main functionalities

L9780

24/56

DocID026356 Rev 3

RCT2 voltage resolution depends on different contributions:

A/D error conversion (±2 counts);

scaling amplifier gain accuracy (±.5%);

scaling amplifier offset (±300 μV);

RCT2 amplifier gain accuracy (±1%);

RCT2 amplifier output offset (±21 mV);

VCCA voltage precision.

When the VCCS filtered control voltage FV is selected by the MUX, the nominal transfer

function from VCCS current (I_VCCS) to A/D output is:

count_VCCS

floor 512

Gsa

-I_VCCS

 Rtot



VCCA

-------------------------------------------------------------

1024







and the nominal transfer function is:

I_VCCS

count_VCCS

1024

------------------------------------

---

–





Gsa Rtot



----------------------------

VCCA



–

where:

Gsa is the scaling amplifier gain;

I_VCCS is the VCCS output current;

count_VCCS is the result of the A/D conversion of FV pin voltage;

Rtot is the VCCS external resistance as defined in Section 4.9.

I_VCCS current resolution depends on different contributions:

A/D error conversion (±2 counts);

scaling amplifier gain accuracy (±0.5% if Gsa=1, ±1% if Gsa = 1.5-2-3-4, ±2% if

Gsa=6-8-12);

scaling amplifier offset (±300 μV);

VCCS gain accuracy (±1.2%);

VCCS offset (±700 μV);

VCCA voltage precision;

Rtot precision.

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