AD7951(2015) Ver la hoja de datos (PDF) - Analog Devices

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Fabricante

AD7951
(Rev.:2015)

14-Bit, 1 MSPS, Unipolar/Bipolar Programmable Input PulSAR® ADC

Analog Devices 

Data Sheet

AD7951

TYPICAL CONNECTION DIAGRAM

Figure 27 shows a typical connection diagram for the AD7951 using the internal reference, serial data and serial configuration interfaces.

Different circuitry from that shown in Figure 27 is optional and is discussed in the following sections.

ANALOG

SUPPLY (5V)

10µF

100nF

NOTE 5

10Ω

DIGITAL

SUPPLY (5V)

10µF 100nF

100nF

10µF

DIGITAL

INTERFACE

SUPPLY

(2.5V, 3.3V, OR 5V)

+7V TO +15.75V

SUPPLY

10µF

100nF

–7V TO –15.75V

SUPPLY

NOTE 6

10µF

100nF

CREF

NOTE 4 22µF

100nF

ANALOG

INPUT+

NOTE 2

U1

15Ω

CC

2.7nF

ANALOG

INPUT–

NOTE 1

AVDD AGND DGND

VCC

DVDD OVDD OGND

BUSY

VEE

REF NOTE 3

REFBUFIN

REFGND

IN+

IN–

SDCLK

SDOUT

SCCLK

SCIN

SCCS

AD7951

NOTE 3

PDREF PDBUF

CNVST

OB/2C

SER/PAR

HW/SW

BIPOLAR

TEN

WARP

IMPULSE

PD RD CS RESET

NOTE 7

50Ω

D

OVDD

MICROCONVERTER/

MICROPROCESSOR/

DSP

SERIAL

PORT 1

SERIAL

PORT 2

CLOCK

NOTES

1. SEE ANALOG INPUT SECTION. ANALOG INPUT(–) IS REFERENCED TO AGND ±0.1V.

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

3. THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE. SEE VOLTAGE REFERENCE INPUT SECTION.

4. A 22µF CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (FOR EXAMPLE, PANASONIC ECJ4YB1A226M).

SEE VOLTAGE REFERENCE INPUT SECTION.

5. OPTION, SEE POWER SUPPLY SECTION.

6. THE VCC AND VEE SUPPLIES SHOULD BE VCC = [VIN(MAX) +2V] AND VEE = [VIN(MIN) –2V] FOR BIPOLAR INPUT RANGES.

FOR UNIPOLAR INPUT RANGES, VEE CAN BE 0V. SEE POWER SUPPLY SECTION.

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

Figure 27. Typical Connection Diagram Shown with Serial Interface and Serial Programmable Port

Rev. B | Page 19 of 32

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