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db05175e_V3.01_preliminary_2017-07-06

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AS89000

V3.01

2 DESCRIPTION OF INTERFACE

2.1 Pin Assignment

Table 1: Pin assignment

SIGNAL NAME

TYP

A/DA

FUNCTION

VDD

input

a/d

power supply

GND

input

a/d

ground

VREF

input

a

reference voltage

SW1

input

d

input 1 for adjustment of transimpedance of AS89000-amplifier (pull

down)

SW2

input

d

input 2 for adjustment of transimpedance of AS89000-amplifier (pull

down)

SW3

input

d

input 3 for adjustment of transimpedance of AS89000-amplifier (pull

down)

SW4

input

d

switchable frequency range depended on input capacitance of the

photo-sensor (pull down)

PD

input

d

power down mode (pull down)

IIN<X>

input

a

analog current input of amplifier X

VOUT<X>

output

a

analog voltage output of amplifier X

a

) analog or digital

2.2 Adjustment of Transimpedance

Table 2: Adjustment of Transimpedance

SETTINGS OF DIGITAL INPUTS

TRANSIMPEDANCE R

SW1

SW2

SW3

VDD

VDD

VDD

20 M – stage 1

GND

VDD

VDD

10 M – stage 2

GND

VDD

GND

5 M – stage 3

VDD

GND

VDD

2 M – stage 4

GND

GND

VDD

1 M – stage 5

VDD

GND

GND

500 k – stage 6

VDD

VDD

GND

100 k – stage 7

GND

GND

GND

25 kb – stage 8

b

) default by pull down

2.3 Switchable Frequency Rrange

Table 3: Switchable Frequency Rrange

SETTINGS OF DIGITAL INPUT

ALLOWED CAPACITANCE OF PHOTO-SENSOR

SW4

VDD

< 5 pF

GND

< 80 pFc

c

) default by pull down

2.4 Power Down Mode

Table 4: Power Down Mode

SETTINGS OF DIGITAL INPUT

BIAS CURRENT OF THE IC

PD

VDD

< 8 µA

GND

typicald

d

) default by pull down