Vicom Systems FC-FC3 Instrukcja Użytkownika Pobierz pdf (Strona 7)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

- 7 -

Block Diagram and Functi

ons

Gain Amplifier Block, LPF, S/H&SCF& Level shifter, Buffer & SMF

The set of these blocks amplifies, compensates and outputs the pressure sensor signal.

The circuits from Gain Amplifier to S/H amplify, compensate, sample and hold the pressure sensor

output by time sharing. The output stage, with an internal resistor of 146kΩ, band-limited with an

external capacitor on VO pin, can provide a low impedance output via buffer. By enabling SCF and

SMF, band limit can be done, eliminating the need for the external capacitors. The output reference

voltage can be set with an integrated level shifter. Percentage indications define a 4800mVdc output as

100%, which is 60times magnified level of 80mVdc differential input.

Block

Functions

Gain Amp.

1/2/3

Gain

(G1/2/3)

Gain Amp.1 is a low-noise high-gain amplifier at the front. The differential signal is

amplified by a factor of 10x typ. (5x to 70x).

Gain Amp.2 converts the G1 differential output to single-ended with reference to

0.5*VDD and amplifies by a factor of 1.5x typ. (or 3.0x).

Gain Amp.3 amplifies by a factor of 1.8x typ. (or 3.0x).

Span voltage is adjusted with G1/2/3 Gain (G1/2: coarse adjustment, G3: fine

adjustment).

Offset_Temp.

Offset

Offset Temp.

track

(G2)

The pressure sensor offset voltage and

offset temperature drift are compensated by using

the preloaded compensation data in the EEPROM.

The following value is converted into

the input value at @5.0V.

Offset adj. Adj. range Coarse: ±13 to ±373mV

Fine: ±1 to ±34mV

Adj. step Coarse: 2 to 53mV /step

Fine: 0.01 to 0.27mV /step

Offset temp. drift. adj. Adj. range ±0.04 to ±1.23mV/ ºC

Adj. step 0.2 to 4.8μV/ºC step

Offset Temp.

track

Gain Temp.

track

Offset

Gain Amplifier Block

Offset_Temp.

Gain

Gain_Temp.

Gain Amp.1 Gain Amp.2 Gain Amp.3

S/H & SCF

& Level Shift

STV

Regulator

EEPROM

Control

VDD track

VDD

VSS

V_Bandgap

V_Reference

I_Reference

LPF

Serial I/F

Power ON

Reset

Pressure Detector 2

DET1

VOUT

DET2 / PTH

VOUT

Timing

Logic

Oscillator

EEPROM

SDI/O

CSCLK

Pressure Detector 1

Buffer

& SMF

EXTMP

V_Temp.

(internal or

external)

Common

VDD

1 2 3 4 5 6 7 8 9 10 11 12 ... 67 68

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