參數(shù)資料
型號(hào): DAC1208D650HN
廠商: NXP SEMICONDUCTORS
元件分類: DAC
英文描述: Dual 12-bit DAC; up to 650 Msps; 2×, 4× or 8× interpolating
中文描述: 12-BIT DAC, PQCC64
封裝: 9 X 9 MM, 0.85 MM HEIGHT, PLASTIC, SOT804-3, VQFN-64
文件頁數(shù): 34/98頁
文件大小: 557K
代理商: DAC1208D650HN
DAC1208D650
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 14 December 2010
34 of 98
NXP Semiconductors
DAC1208D650
2
×
, 4
×
or 8
×
interpolating DAC with JESD204A interface
10.13.2
DC interface to an Analog Quadrature Modulator (AQM)
When the system operation requires to keep the DC component of the spectrum, the
DAC1208D650 must use a DC interface to connect to an AQM. In this case, the offset
compensation for LO cancellation can be made with the use of the digital offset control in
the DAC.
Figure 21
is an example of a connection to an AQM with a common-mode input level
(V
i(cm)
) of 1.7 V.
Figure 22
is an example of a connection to an AQM with a common-mode input level
(V
i(cm)
) of 3.3 V.
The auxiliary DACs can be used to control the offset in a precise range or with precise
steps.
Fig 21. Example of a DC interface connection to an AQM with a V
i(cm)
of 1.7 V
Fig 22. Example of a DC interface connection to an AQM with a V
i(cm)
of 3.3 V
001aaj541
51.1
Ω
51.1
Ω
442
Ω
442
Ω
V
DDA(3V3)
IOUTnP
IOUTnN
0 mA to 20 mA
BBP
(1)
IOUTnP/IOUTnN; V
o(cm)
= 2.67 V; V
o(dif)(p-p)
= 1.98 V
(2)
BBP/BBN; V
i(cm)
= 1.7 V; V
i(dif)(p-p)
= 1.26 V
BBN
AQM (V
i(cm)
= 1.7 V)
768
Ω
768
Ω
(1)
(2)
001aaj542
54.9
Ω
54.9
Ω
237
Ω
237
Ω
V
DDA(3V3)
IOUTnP
IOUTnN
BBP
BBN
AQM (V
i(cm)
= 3.3 V)
750
Ω
750
Ω
5 V
1.27 k
Ω
1.27 k
Ω
(1)
IOUTnP/IOUTnN; V
o(cm)
= 2.75 V; V
o(dif)(p-p)
= 1.97 V
(2)
BBP/BBN; V
i(cm)
= 3.3 V; V
i(dif)(p-p)
= 1.5 V
(1)
(2)
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