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參數資料
| 型號： | AD9954 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
| 中文描述： | 400 MSPS的14位，1.8伏的CMOS直接數字頻率合成 |
| 文件頁數： | 9/36頁 |
| 文件大小： | 1027K |
| 代理商： | AD9954 |
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AD9954
PIN FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions—48-Lead TQFP/EP
Pin No.
Mnemonic
1
I/O UPDATE
Rev. 0 | Page 9 of 36
I/O
I
Description
The rising edge transfers the contents of the internal buffer memory to the I/O registers. This pin
must be set up and held around the SYNC_CLK output signal.
Digital Power Supply Pins (1.8 V).
Digital Power Ground Pins.
Analog Power Supply Pins (1.8 V).
2, 34
3, 33, 42
4, 6, 13, 16,
18, 19, 25,
27, 29
5, 7, 14, 15,
17, 22, 26,
32
8
DVDD
DGND
AVDD
I
I
I
AGND
I
Analog Power Ground Pins.
OSC/REFCLK
I
Complementary Reference Clock/Oscillator Input. When the REFCLK port is operated in single-
ended mode, REFCLKB should be decoupled to AVDD with a 0.1 μF capacitor.
Reference Clock/Oscillator Input. See Clock Input section for details on the OSCILLATOR/REFCLK
operation.
Output of the Oscillator Section.
Control Pin for the Oscillator Section. When high, the oscillator section is enabled. When low, the
oscillator section is bypassed.
This pin provides the connection for the external zero compensation network of the REFCLK
multiplier’s PLL loop filter. The network consists of a 1 k resistor in series with a 0.1 μF capacitor
tied to AVDD.
Complementary DAC Output. Should be biased through a resistor to AVDD, not AGND.
DAC Output. Should be biased through a resistor to AVDD, not AGND.
DAC Biasline Decoupling Pin.
A resistor (3.92 k nominal) connected from AGND to DAC_R
SET
establishes the reference current
for the DAC.
Comparator Output.
Comparator Input.
Comparator Complementary Input.
Input Pin Used as an External Power-Down Control (see Table 13 for details).
Active High Hardware Reset Pin. Assertion of the RESET pin forces the AD9954 to the initial state,
as described in the I/O port register map.
Asynchronous Active High Reset of the Serial Port Controller. When high, the current I/O
operation is immediately terminated, enabling a new I/O operation to commence once IOSYNC is
returned low. If unused, ground this pin; do not allow this pin to float.
When operating the I/O port as a 3-wire serial port, this pin serves as the serial data output. When
operated as a 2-wire serial port, this pin is unused and can be left unconnected.
This pin functions as an active low chip select that allows multiple devices to share the I/O bus.
This pin functions as the serial data clock for I/O operations.
When operating the I/O port as a 3-wire serial port, this pin serves as the serial data input, only.
When operated as a 2-wire serial port, this pin is the bidirectional serial data pin.
Digital Power Supply (for I/O Cells Only, 3.3 V).
Input signal used to synchronize multiple AD9954s. This input is connected to the SYNC_CLK
output of a master AD9954.
Clock Output Pin that Serves as a Synchronizer for External Hardware.
Input pin used to control the direction of the shaped on-off keying function when programmed
for operation. OSK is synchronous to the SYNC_CLK pin. When OSK is not programmed, this pin
should be tied to DGND.
Input pin used to select one of the four internal profiles. Profile <1:0> are synchronous to the
SYNC_CLK pin. Any change in these inputs transfers the contents of the internal buffer memory
to the I/O registers (sends an internal I/O UPDATE).
The exposed paddle on the bottom of the package is a ground connection for the DAC and must
be attached to AGND in any board layout.
9
OSC/REFCLK
I
10
11
CRYSTAL OUT
CLKMODESELECT
O
I
12
LOOP_FILTER
I
20
21
23
24
IOUT
IOUT
DACBP
DAC_R
SET
O
O
I
I
28
30
31
35
36
COMP_OUT
COMP_IN
COMP_IN
PWRDWNCTL
RESET
O
I
I
I
I
37
IOSYNC
I
38
SDO
O
39
40
41
CS
SCLK
SDIO
I
I
I/O
43
44
DVDD_I/O
SYNC_IN
I
I
45
46
SYNC_CLK
OSK
O
I
47, 48
PS0, PS1
I
<49>
AGND
I
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相關代理商/技術參數 |
參數描述 |
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| AD9954/PCB | 制造商:Analog Devices 功能描述:AD9954 400 MSPS DDS W/ 14 BIT DAC EVALBD - Bulk 制造商:Analog Devices 功能描述:EVALUATION KIT ((NS)) |
| AD9954/PCBZ | 功能描述:BOARD EVAL FOR 9954 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:AgileRF™ 標準包裝:1 系列:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源 |
| AD9954/PCBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer |
| AD9954_09 | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer |
| AD9954YSV | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 400MHz 1-DAC 14-Bit Serial 48-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:400 MSPS DDS W/14 BIT DAC - Bulk 制造商:Analog Devices 功能描述:IC DDS 400MSPS SMD 9954 TQFP48 |
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