L9780 datasheet(24/56 Pages) STMICROELECTRONICS

24 / 56 page

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.

L9780 Datenblatt(PDF) 24 Page - STMicroelectronics

L9780 Datenblatt(HTML) 24 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Datenblatt Download

Link URL