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AD9953ASV Datasheet(PDF) 8 Page - Analog Devices

Part # AD9953ASV
Description  400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9953ASV Datasheet(HTML) 8 Page - Analog Devices

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PRELIMINARY TECHNICAL DATA
AD9953
Hardware Pin Descriptions
Pin #
Pin Name
I/O
Description
1
I/O UPDATE
I
The rising edge transfers the contents of the internal
buffer memory to the IO Registers.
2,34
DVDD
I
Digital power supply pins.
3,33,
42
DGND
I
Digital power ground pins.
4,6,
13,16,
18,19,
25,27,
29
AVDD
I
Analog power supply pins.
5,7,
14,15,
17,22,
26,
30,31
32
AGND
I
Analog power ground pins.
8
OSCB/REFCLKB
I
Complementary reference clock/oscillator input
(400MHz max.). NOTE: When the REFCLK port is
operated in single-ended mode, then REFCLKB should
be decoupled to AVDD with a 0.1
µF capacitor.
9
OSC/REFCLK
I
Reference clock/oscillator input (400 MHz max.). See
Clock Input section of datasheet for details on the
REFCLK/OSCILLATOR operation.
10
Crystal Out
O
Output of the oscillator section.
11
ClkModeSelect
I
Control pin for the oscillator section. When high, the
oscillator section is enabled. When low, the oscillator
section is bypassed.
12
LOOP_FILTER
I
This Pin provides the connection for the external zero
compensation network of the REFCLK Multiplier’s PLL
loop filter. The network consists of a 1K ohm resistor in
series with a 0.1
µF capacitor tied to AVDD.
20
IOUTB
O
Complementary DAC output.
21
IOUT
O
DAC output.
23
DACBP
I
DAC “biasline” decoupling pin.
24
DAC_Rset
I
A resistor (3.85K
Ω nominal) connected from AGND to
DAC_Rset establishes the reference current for the
DAC.
28
NC
O
No connect.
35
PwrDwnCtl
I
Input pin used as an external power down control. See
the External Power Down Control section of this
document for details.
REV. PrB 1/30/03
Page 8
Analog Devices, Inc.


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