AD7665AST datasheet(13/24 Pages) AD

13 / 24 page

REV. 0

AD7665

–13–

Table III. Output Codes and Ideal Input Voltages

Digital Output Code

(Hexa)

Straight Two’s

Description

Analog Input

Binary

Complement

Full-Scale Range

±10 V

±5 V

±2.5 V

0 V to 10 V

0 V to 5 V

0 V to 2.5 V

Least Significant Bit 305.2

µV

152.6

µV

76.3

µV

152.6

µV

76.3

µV

38.15

µV

FSR – 1 LSB

9.999695 V

4.999847 V

2.499924 V

9.999847 V

4.999924 V 2.499962 V

FFFF

7FFF

Midscale + 1 LSB

305.2

µV

152.6

µV

76.3

µV

5.000153 V

2.570076 V 1.257038 V

8001

0001

Midscale

0 V

5 V

2.5 V

1.25 V

8000

0000

Midscale – 1 LSB

–305.2

µV

–152.6

µV

–76.3

µV

4.999847 V

2.499924 V 1.249962 V

7FFF

FFFF

–FSR + 1 LSB

–9.999695 V –4.999847 V –2.499924 V 152.6

µV

76.3

µV

38.15

µV

0001

8001

–FSR

–10 V

–5 V

–2.5 V

0 V

0000

8000

NOTES

1This is also the code for an overrange analog input.

2This is also the code for an underrange analog input.

100nF

10 F

100nF

10 F

AVDD

10 F

100nF

AGND

DGND

DVDD

OVDD

OGND

SER/

PAR

CNVST

BUSY

SDOUT

SCLK

RESET

REFGND

CREF

2.5V REF

REF

100

CLOCK

AD7665

C/ P/DSP

SERIAL

PORT

DIGITAL SUPPLY

(3.3V OR 5V)

ANALOG

SUPPLY

(5V)

DVDD

OB/

NOTE 8

BYTESWAP

DVDD

50k

100nF

INA

100nF

IND

INGND

ANALOG

INPUT

( 10V)

2.7nF

10 F

NOTE 2

NOTE 1

NOTE 3

NOTE 7

NOTE 4

INC

INB

NOTE

NOTES :

1. SEE VOLTAGE REFERENCE INPUT CHAPTER.

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

3. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.

4. FOR BIPOLAR RANGE ONLY. SEE SCALER REFERENCE INPUT SECTION.

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

6. WITH 0 TO 2.5V RANGE ONLY. SEE ANALOG INPUTS SECTION.

7. OPTION. SEE POWER SUPPLY SECTION.

8. OPTIONAL LOW JITTER

CNVST. SEE CONVERSION CONTROL SECTION.

AD8031

AD8021

ADR421

NOTE 5

WARP

IMPULSE

Figure 5. Typical Connection Diagram (

±10 V Range Shown)

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