AS8579-ASST datasheet(11/44 Pages) AMSCO

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AS8579

Electrical Characteristics

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

│ 10

5.2

Analog Front End

Figure 7:

Analog Front End

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

SENS

System sensitivity

@PGA=0, CBG=0,

TXV=2, FREQ=3

9.375

12.5

15.625

LSB/pF

CSENSE

Sensing capacity range

Measuring range with

5 kOhm in parallel

2000

CLOAD

capacity of cable shielding

2000

LIN

Overall system linearity

Sensor capacitance

range 0 nF to 2 nF

NOISE

System noise

On I or Q registers

σ noise referenced to

full scale

±0.2

PSR

System power supply

rejection

±20

LSB

VMM

Output voltage mismatch

between drivers

PMM

Output phase mismatch

between drivers

Deg

ROUT0

SENx output DC

resistance

MODE=0

ROUT1

SENx output DC

resistance

MODE=1

ROUT2

SENx output DC

resistance

MODE=2

3.5

6.5

SCI

Sensor crosstalk

impedance

Differential impedance

between SENx pins

MΩ

CAP

Output capacitance of

SEN line

DCAP

Driver output capacitance

drift over temp / lifetime

0.5

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