ADAS3022 datasheet(24/40 Pages) AD

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ADAS3022

Data Sheet

Rev. A | Page 24 of 40

Table 6. Output Codes and Ideal Input Voltages

Description

Differential Analog

Inputs, VREF = 4.096 V

Digital Output Code

(Twos Complement, Hex)

FSR − 1 LSB

(32,767 × VREF)/

(32,768 × PGIA gain)

0x7FFF

Midscale + 1 LSB

VREF/(32,768 × PGIA

gain)

0x0001

Midscale

0x0000

Midscale − 1 LSB

−(VREF/(32,768 × PGIA

gain))

0xFFFF

−FSR + 1 LSB

−(32,767 × VREF)/

(32,768 × PGIA gain)

0x8001

−FSR

−VREF × PGIA gain

0x8000

TYPICAL APPLICATION CONNECTION DIAGRAM

As shown in Figure 54, the ADP1613 is used in an inexpensive

SEPIC-Ćuk topology, which is an ideal candidate for providing

the ADAS3022 with the necessary high voltage ±15 V robust

supplies (at 20 mA) and low output ripple (3 mV maximum)

from an external 5 V supply. The ADP1613 satisfies the

specification requirements of the ADAS3022 with minimal

external components while achieving greater than 86% of

efficiency. Refer to the CN-0201 circuit note for complete

information about this test setup.

IN0

IN0/IN1

IN2/IN3

IN4/IN5

IN6/IN7

IN1

IN2

IN3

IN4

IN5

IN6

IN7

DIFF

PAIR

DIFF

COM

LOGIC/

INTERFACE

REFIN

REF

MUX

CNV

RESET

SCK

DIN

SDO

VDDH

AVDD DVDD

VIO

COM

AUX+

AUX–

BUSY

ENABLE

ADP1613

ADAS3022

COMP

FREQ

VIN

GND

VIN = +5V

VSSH

RF2

4.22kΩ

RF1B

47.5kΩ

RC1

100kΩ

CC1

12nF

CC2

10pF

CV5

1µF

REN

RB0

1Ω

RS1

0Ω

RS2

DNI

CSS

1µF

CIN

1µF

COUT3

4.7µF

COUT1

1µF

COUT2

2.2µF

+15V

–15V

+5V

ADR434

REFx

AGND DGND

AD8031

4.096V

–

1.78Ω

RFILT

DNI

50kΩ

47µH

+5V

BUF

PulSAR

ADC

TEMP

SENSOR

PGIA

Figure 54. Complete 5 V, Single-Supply, 8-Channel Multiplexed Data Acquisition System with PGIA

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