AD7655AST datasheet(15/28 Pages) AD

15 / 28 page

AD7655

Rev. B | Page 15 of 28

AVDD

AGND

DGND

DVDD OVDD

OGND

SER/PAR

CNVST

BUSY

SDOUT

SCLK

RESET

REFGND

CREF

2.5V REF

NOTE 1

REF

REF A

REF B

CLOCK

AD7655

μC/μP/

DSP

SERIAL PORT

DIGITAL SUPPLY

(3.3V OR 5V)

ANALOG

SUPPLY

(5V)

DVDD

A/B

NOTE 7

BYTESWAP

DVDD

50k

100nF

INA1

2.7nF

NOTE 4

NOTE 5

2.7nF

NOTE 4

NOTE 5

INAN

INA2

NOTE 2

NOTE 3

NOTE 6

AD780

μF

100nF

μF

NOTES

1. SEE VOLTAGE REFERENCE INPUT SECTION.

2. WITH THE RECOMMENDED VOLTAGE REFERENCES, CREF IS 47μF. SEE VOLTAGE REFERENCE INPUT SECTION.

3. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.

4. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.

5. SEE ANALOG INPUTS SECTION.

6. OPTIONAL, SEE POWER SUPPLY SECTION.

7. OPTIONAL LOW JITTER CNVST. SEE CONVERSION CONTROL SECTION.

INB1

2.7nF

NOTE 4

NOTE 5

INBN

2.7nF

NOTE 4

NOTE 5

INB2

ANALOG INPUT A1

ANALOG INPUT A2

ANALOG INPUT B1

ANALOG INPUT B2

μF

NOTE 1

Figure 17. Typical Connection Diagram (Serial Interface)

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