Electrical specifications

L9907

28/49

DS11800 Rev 5

3. Guaranteed by design.

4.















Where:



ISxHI is current flowing out from ISxHI pin

ISxLO is current flowing out from ISxLO pin

Vcc = reference supply [5 V or 3.3 V]



Gnom = nominal programmed gain [10, 30, 50, 100]



I(trim,HI/LO) = offset trimming current (w.c. ± 8 µA see expression below)



Phase = programmed phase configuration [1 if selected, otherwise 0]



I(rail) = current from auxiliary rail (used for floating OpAmp) [typ ~145 µA±35% T+Models]

























Where:



Vbg = band gap reference (1.2371 V nominal)



Ground = programmed ground configuration [1 if selected, otherwise 0]



Trimming bit weight= how many mV offset trimming are programmed.



The ± depends on offset trim direction (+: bit7=1, -: bit7=0)

5. A 350 kHz, 100 mVpp, ripple at the boost regulator output, generates 1 mVpp noise at the amplifier input. It represents a 2

App current noise on a 0.5 m

 current sense resistor.

ISxHI

0.8 VCC



2000 Gnom



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

Itrim HI





+





2

3 Phase





+



8

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

10

A

+



–

=

ISxLO

0.8 VCC



2000 Gnom



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

Itrim LO





+



 2

8

---

10

AI rail



++



–

=

Itrim HI





Vbg

15

-----------

trimming bit

weight

2

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

10300

5

3 Ground





+





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

2

3 Phase





+



8

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





=

Itrim LO





Vbg

15

-----------

trimming bit

weight

2

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

10300

5

3 Ground





+





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

2

8

---





=