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AD7609

8-Channel Differential DAS with 18-Bit, Bipolar, Simultaneous Sampling ADC

Analog Devices 

Data Sheet

8-Channel Differential DAS with 18-Bit,

Bipolar, Simultaneous Sampling ADC

AD7609

FEATURES

8 simultaneously sampled inputs

True differential inputs

True bipolar analog input ranges: ±10 V, ±5 V

Single 5 V analog supply and 2.3 V to 5.25 V VDRIVE

Fully integrated data acquisition solution

Analog input clamp protection

Input buffer with 1 MΩ analog input impedance

Second-order antialiasing analog filter

On-chip accurate reference and reference buffer

18-bit ADC with 200 kSPS on all channels

Oversampling capability with digital filter

Flexible parallel/serial interface

SPI/QSPI™/MICROWIRE™/DSP compatible

Performance

7 kV ESD rating on analog input channels

98 dB SNR, −107 dB THD

Dynamic range: up to 105 dB typical

Low power: 100 mW

Standby mode: 25 mW

64-lead LQFP package

APPLICATIONS

Power line monitoring and protection systems

Multiphase motor control

Instrumentation and control systems

Multiaxis positioning systems

Data acquisition systems (DAS)

COMPANION PRODUCTS

External References: ADR421, ADR431

Digital Isolators: ADuM1402, ADuM5000, ADuM5402

Power: ADIsimPower, Supervisor Parametric Search

Additional companion products on the AD7609 product page

Table 1. High Resolution, Bipolar Input, Simultaneous

Sampling DAS Solutions

Resolution

Single-

Ended

Inputs

True

Number of

Differential Simultaneous

Inputs

Sampling Channels

18 Bits

AD7608

AD76091

8

16 Bits

AD7606

8

AD7606-6

6

AD7606-4

4

14 Bits

AD7607

8

1 Protected by U.S. Patent Number 8,072,360 B2.

FUNCTIONAL BLOCK DIAGRAM

AVCC

AVCC

REGCAP REGCAP REFCAPB REFCAPA

V1+

CLAMP 1MΩ

RFB

V1–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

V2+

CLAMP 1MΩ

RFB

V2–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

V3+

CLAMP 1MΩ

RFB

V3–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

2.5V

LDO

2.5V

LDO

2.5V

REF

V4+

CLAMP 1MΩ

RFB

V4–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

V5+

CLAMP 1MΩ

RFB

V5–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

8:1

MUX

SERIAL

18-BIT

SAR

DIGITAL

FILTER

PARALLEL/

SERIAL

INTERFACE

V6+

CLAMP 1MΩ

RFB

V6–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

V7+

CLAMP 1MΩ

RFB

V7–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

AD7609

CLK OSC

PARALLEL

V8+ CLAMP 1MΩ RFB

V8–

CLAMP

1MΩ

SECOND- T/H

RFB ORDER LPF

CONTROL

INPUTS

AGND

CONVST A CONVST B RESET RANGE

Figure 1.

REFIN/REFOUT

REF SELECT

AGND

OS 2

OS 1

OS 0

DOUTA

DOUTB

RD/SCLK

CS

PAR/SER SEL

VDRIVE

DB[15:0]

BUSY

FRSTDATA

Rev. B

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