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參數資料
| 型號： | AD9753ASTZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.011 us SETTLING TIME, 12-BIT DAC, PQFP48 |
| 封裝： | 1.40 MM HEIGHT, ROHS COMPLIANT, PLASTIC, MS-026BBC, LQFP-48 |
| 文件頁數： | 4/28頁 |
| 文件大?。?/td> | 814K |
| 代理商： | AD9753ASTZRL |
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REV. B
–12–
AD9753
reference clock that is twice the input data rate should consider
disabling the PLL clock multiplier to achieve the best SNR
performance from the AD9753. Note, the SFDR performance
of the AD9753 remains unaffected with or without the PLL
clock multiplier enabled.
The effects of phase noise on the AD9753’s SNR performance
become more noticeable at higher reconstructed output frequen-
cies and signal levels. Figure 8 compares the phase noise of a
full-scale sine wave at exactly fDATA/4 at different data rates
(thus carrier frequency) with the optimum DIV1, DIV0 setting.
SNR is partly a function of the jitter generated by the clock
circuitry. As a result, any noise on PLLVDD or CLKVDD may
decrease the SNR at the output of the DAC. To minimize this
potential problem, PLLVDD and CLKVDD can be connected
to DVDD using an LC filter network similar to the one shown
in Figure 9.
FREQUENCY OFFSET (MHz)
0
–20
–110
5
1
0
NOISE
DENSITY
(dBm/Hz)
–10
–30
–40
–50
–60
–70
–80
–90
–100
234
PLL ON, fDATA = 150MSPS
PLL OFF, fDATA = 50MSPS
Figure 8. Phase Noise of PLL Clock Multiplier at
fOUT = fDATA/4 at Different fDATA Settings with DIV0/DIV1
Optimized, Using R&S FSEA30 Spectrum Analyzer
100 F
ELECT.
10 F
TANT.
0.1 F
CER.
TTL/CMOS
LOGIC
CIRCUITS
3.3V POWER SUPPLY
FERRITE
BEADS
CLKVDD
PLLVDD
CLKCOM
Figure 9. LC Network for Power Filtering
DAC TIMING WITH PLL ACTIVE
As described in Figure 7, in PLL active mode, Port 1 and
Port 2 input latches are updated on the rising edge of CLK. On
the same rising edge, data previously present in the input Port 2
latch is written to the DAC output latch. The DAC output will
update after a short propagation delay (tPD).
Following the rising edge of CLK at a time equal to half of its
period, the data in the Port 1 latch will be written to the DAC
output latch, again with a corresponding change in the DAC
output. Due to the internal PLL, the time at which the data in
the Port 1 and Port 2 input latches is written to the DAC latch
is independent of the duty cycle of CLK. When using the PLL,
the external clock can be operated at any duty cycle that meets
the specified input pulsewidth.
On the next rising edge of CLK, the cycle begins again with the
two input port latches being updated, and the DAC output latch
being updated with the current data in the Port 2 input latch.
PLL DISABLED MODE
When PLLVDD is grounded, the PLL is disabled. An external
clock must now drive the CLK inputs at the desired DAC out-
put update rate. The speed and timing of the data present at
input Ports 1 and 2 are now dependent on whether or not the
AD9753 is interleaving the digital input data or only responding
to data on a single port. Figure 10 is a functional block diagram
of the AD9753 clock control circuitry with the PLL disabled.
PLLVDD
TO DAC
LATCH
PLLLOCK
CLOCK
LOGIC
( 1 OR
2)
DIFFERENTIAL-
TO-
SINGLE-ENDED
AMP
TO
INTERNAL
MUX
CLKIN+
CLKIN–
AD9753
RESET DIV0 DIV1
TO INPUT
LATCHES
Figure 10. Clock Circuitry with PLL Disabled
DIV0 and DIV1 no longer control the PLL but are used to set
the control on the input mux for either interleaving or non-
interleaving the input data. The different modes for states of
DIV0 and DIV1 are given in Table II.
Table II. Input Mode for DIV0,
DIV1 Levels with PLL Disabled
Input Mode
DIV1
DIV0
Interleaved (2
×)0
0
Noninterleaved
Port 1 Selected
0
1
Port 2 Selected
1
0
Not Allowed
1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9753-EB | 功能描述:BOARD EVAL FOR AD9753 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數模轉換器 (DAC) 系列:TxDAC+® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- DAC 的數量:4 位數:12 采樣率（每秒）:- 數據接口:串行，SPI? 設置時間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| AD9754 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 125 MSPS High Performance TxDAC D/A Converter |
| AD9754AR | 功能描述:IC DAC 14BIT 125MSPS HP 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:TxDAC® 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯(lián) 轉換器數目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD9754ARRL | 制造商:Analog Devices 功能描述:DAC 1-CH 14-bit 28-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:14-BIT, 125 MSPS+ TXDAC D/A CONVERTER - Tape and Reel |
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