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參數資料
| 型號： | AD97651 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit, 125 MSPS Dual TxDAC+ D/A Converter |
| 中文描述： | 12位，125 MSPS的TxDAC系列雙D / A轉換 |
| 文件頁數： | 13/28頁 |
| 文件大?。?/td> | 472K |
| 代理商： | AD97651 |
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REV. B
AD9765
–13–
Note that the clock input could also be driven via a sine wave,
which is centered around the digital threshold (i.e., DVDD/2)
and meets the min/max logic threshold. This will typically result
in a slight degradation in the phase noise, which becomes more
noticeable at higher sampling rates and output frequencies.
Also, at higher sampling rates, the 20% tolerance of the digital
logic threshold should be considered since it will affect the effec-
tive clock duty cycle and, subsequently, cut into the required
data setup and hold times.
DVDD
DIGITAL
INPUT
Figure 28. Equivalent Digital Input
INPUT CLOCK AND DATA TIMING RELATIONSHIP
SNR in a DAC is dependent on the relationship between the
position of the clock edges and the point in time at which the
input data changes. The AD9765 is rising edge triggered, and so
exhibits SNR sensitivity when the data transition is close to this
edge. In general, the goal when applying the AD9765 is to make
the data transition close to the falling clock edge. This becomes
more important as the sample rate increases. Figure 29 shows
the relationship of SNR to clock placement with different sample
rates. Note that at the lower sample rates, much more tolerance
is allowed in clock placement, while much more care must be
taken at higher rates.
TIME OF DATA CHANGE RELATIVE TO
RISING CLOCK EDGE
–
ns
S
–
0
–
4
–
2
0
2
3
–
3
–
1
4
1
10
20
30
40
50
60
70
Figure 29. SNR vs. Clock Placement @ f
OUT
= 20 MHz and
f
CLK
= 125 MSPS
SLEEP MODE OPERATION
The AD9765 has a power-down function that turns off the output
current and reduces the supply current to less than 8.5 mA
over the specified supply range of 3.0 V to 5.5 V and tempera-
ture range. This mode can be activated by applying a Logic
Level “1” to the SLEEP pin. The SLEEP pin logic threshold is
equal to 0.5
×
AVDD. This digital input also contains an active
pull-down circuit that ensures the AD9765 remains enabled if
this input is left disconnected. The AD9765 takes less than
50 ns to power down and approximately 5
μ
s to power back up.
POWER DISSIPATION
The power dissipation, P
D
, of the AD9765 is dependent on
several factors that include: (1) The power supply voltages
(AVDD and DVDD), (2) the full-scale current output I
OUTFS
,
(3) the update rate f
CLOCK
, (4) and the reconstructed digital
input waveform. The power dissipation is directly proportional
to the analog supply current, I
AVDD
, and the digital supply cur-
rent, I
DVDD
. I
AVDD
is directly proportional to I
OUTFS
as shown
in Figure 30 and is insensitive to f
CLOCK
.
I
OUTFS
0
5
10
10
I
A
20
30
40
50
60
70
80
15
20
25
Figure 30. I
AVDD
vs. I
OUTFS
Conversely, I
DVDD
is dependent on both the digital input wave-
form, f
CLOCK
, and digital supply DVDD. Figures 31 and 32
show I
DVDD
as a function of full-scale sine wave output ratios
(f
OUT
/f
CLOCK
) for various update rates with DVDD = 5 V and
DVDD = 3 V, respectively. Note how I
DVDD
is reduced by more
than a factor of 2 when DVDD is reduced from 5 V to 3 V.
RATIO
–
f
OUT
/f
CLK
0
0.10
0
I
D
–
5
10
15
20
25
30
35
0.20
0.30
0.40
0.50
125MSPS
100MSPS
65MSPS
25MSPS
5MSPS
Figure 31. I
DVDD
vs. Ratio @ DVDD = 5 V
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9765AST | 功能描述:數模轉換器- DAC 12-Bit 125 MSPS Dual TxDAC+ RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| AD9765ASTRL | 制造商:Analog Devices 功能描述:DAC 2-CH Segment 12-bit 48-Pin LQFP T/R 制造商:Analog Devices 功能描述:DAC DUAL CURRENT STEERING 12-BIT 48LQFP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:12-BIT, 125 MSPS DUAL TXDAC+ - Tape and Reel 制造商:Analog Devices Inc. 功能描述:Digital to Analog Converters - DAC 12-Bit 125 MSPS Dual TxDAC+ 制造商:Analog Devices Inc. 功能描述:Digital to Analog Converters - DAC 12-Bit 125 MSPS Dual 制造商:Analog Devices 功能描述:CONVERTER - DAC |
| AD9765ASTZ | 功能描述:IC DAC 12BIT DUAL 125MSPS 48LQFP RoHS:是 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:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 設置時間:4µs 位數:12 數據接口:串行 轉換器數目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數目和類型:2 電壓，單極 采樣率（每秒）:* 產品目錄頁面:1398 (CN2011-ZH PDF) |
| AD9765ASTZ | 制造商:Analog Devices 功能描述:12BIT DAC DUAL 125MSPS 48LQFP 制造商:Analog Devices 功能描述:12BIT DAC, DUAL, 125MSPS, 48LQFP |
| AD9765ASTZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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