Analog Devices AD9912 Bedienungsanleitung PDF herunterladen (Seite 15)

AD9912

Rev. D | Page 15 of 40

INPUT/OUTPUT TERMINATION RECOMMENDATIONS

DOWNSTREAM

DEVICE

(HIGH-Z)

AD9912

1.8V

HSTL

OUTPUT

100Ω

06763-027

0.01µF

Figure 33. AC-Coupled HSTL Output Driver

DOWNSTREAM

DEVICE

(HIGH-Z)

AD9912

1.8V

HSTL

OUTPUT

50Ω

06763-028

AVDD/2

Figure 34. DC-Coupled HSTL Output Driver

AD9912

SELF-BIASING

SYSCLK

INPUT

(CRYSTAL

MODE)

10pF*

06763-029

10pF*

REFER TO CRYSTAL

DATA SHEET.

Figure 35. SYSCLK Input, Xtal

AD9912

SELF-BIASING

SYSCLK

INPUT

0.1µF

100Ω

06763-030

CLOCK

SOURCE

WITH DIFF.

OUTPUT

Figure 36. SYSCLK Differential Input, Non-Xtal

AD9912

SELF-BIASING

SYSCLK

INPUT

0.01µF

06763-049

CLOCK SOURCE

WITH

SINGLE-ENDED

1.8V CMOS

OUTPUT

Figure 37. SYSCLK Single-Ended Input, Non-Xtal

AD9912

SELF-BIASING

FDBK INPUT

0.1µF

06763-050

100Ω

(OPTIONAL)

Figure 38. FDBK_IN Input

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 39 40

1 GSPS Direct Digital 1
Synthesizer with 14-Bit DAC 1
TABLE OF CONTENTS 2
SPECIFICATIONS 3
ABSOLUTE MAXIMUM RATINGS 7
Rev. D 10
Rev. D 11
Rev. D 12
Rev. D 13
AMPLITUDE (V) 14
AD9912 15
THEORY OF OPERATION 16
AD9912 16
06763-033 17
SYSCLK INPUTS 19
Functional Description 19
SYSCLK PLL Doubler 19
06763-036 19
06763-039 20
THERMAL PERFORMANCE 23
POWER-UP 24
POWER SUPPLY PARTITIONING 25
SERIAL CONTROL PORT 26
CONTROL REGISTERS 27
REGISTER BUFFERS 27
I/O REGISTER MAP 30
I/O REGISTER DESCRIPTIONS 32
OUTLINE DIMENSIONS 38

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