AD7008/PCB 查看數據表（PDF） - Analog Devices

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AD7008/PCB

CMOS DDS Modulator

Analog Devices 

AD7008

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C unless otherwise noted)

VAA, VDD to GND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V

AGND to DGND . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V

Digital I/O Voltage to DGND . . . . . . . . –0.3 V to VDD + 0.3 V

Analog I/O Voltage to AGND . . . . . . . . –0.3 V to VDD + 0.3 V

Operating Temperature Range

Industrial (A Version) . . . . . . . . . . . . . . . . . –40°C to +85°C

Commercial (J Version) . . . . . . . . . . . . . . . . . .0°C to +70°C

Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C

Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +115°C

PLCC θJA Thermal Impedance . . . . . . . . . . . . . . . +53.8°C/W

θJC Thermal Impedance . . . . . . . . . . . . . . . +24.1°C/W

*Stresses above those listed under “Absolute Maximum Ratings” may cause

permanent damage to the device. This is a stress rating only and functional

operation of the device at these or any other conditions above those listed in the

operational sections of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect device reliability.

ORDERING GUIDE

Model

Temperature

Range

AD7008AP20 –40°C to +85°C

AD7008JP50 0°C to +70°C

AD7008/PCB*

Package

Package

Description Option

44-Pin PLCC P-44A

44-Pin PLCC P-44A

1–3.5" Disk

*AD7008/PCB DDS Evaluation Kit, assembled and tested. Kit includes an

AD7008JP50.

MSB

32-BIT PARALLEL ASSEMBLY REGISTER

LSB

A WORD

D15–D0 ← A WORD*

A WORD

B WORD

*MOST SIGNIFICANT WORD IS LOADED FIRST

D15–D0 ← B WORD

Figure 5. 16-Bit Parallel Port Loading Sequence

MSB

32-BIT PARALLEL ASSEMBLY REGISTER

LSB

A BYTE

D7–D0 ← A BYTE*

A BYTE

B BYTE

D7–D0 ← B BYTE

A BYTE

B BYTE

C BYTE

D7–D0 ← C BYTE

A BYTE

B BYTE

C BYTE

*MOST SIGNIFICANT BYTE IS LOADED FIRST

D BYTE

D7–D0 ← D BYTE

Figure 6. 8-Bit Parallel Port Loading Sequence

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD7008 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

PIN CONFIGURATION

PLCC

6

DGND

D8

D9

D10

D11

D12

D13

D14

D15

WR

VDD

7

17

18

PIN NO. 1 IDENTIFIER

AD7008 PLCC

TOP VIEW

(NOT TO SCALE)

40

39

29

28

VDD

RESET

SLEEP

LOAD

TC3

TC2

TC1

TC0

FSELECT

CLOCK

DGND

–4–

REV. B

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