參數(shù)資料
型號(hào)： DAC1005D750HW
廠商： NXP Semiconductors N.V.
元件分類： 外設(shè)及接口
英文描述： Dual 10-bit DAC, up to 750 Msps; 2x 4x and 8x interpolating
封裝： DAC1005D750HW/C1<SOT638-1 (HTQFP100)|<<http://www.nxp.com/packages/SOT638-1.html<1<Always Pb-free,;DAC1005D750HW/C1<SOT638-1 (HTQFP100)|<<http://www.nxp.com/packages/SOT6
文件頁(yè)數(shù)： 33/42頁(yè)
文件大?。?/td> 353K
代理商： DAC1005D750HW
DAC1005D750
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 7 June 2011
33 of 42
NXP Semiconductors
DAC1005D750
Dual 10-bit DAC, up to 750 Msps; 4x and 8x interpolating
The DAC1005D750 differential outputs can operate up to 2 V
o(p-p)
. In this configuration, it
is recommended to connect the center tap of the transformer to a 62
resistor connected
to the 3.3 V analog power supply, in order to adjust the DC common-mode to
approximately 2.7 V (see
Figure 14
).
10.14.2
DC interface to an Analog Quadrature Modulator (AQM)
When the system operation requires to keep the DC component of the spectrum, the
DAC1005D750 can 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 15
provides an example of a connection to an AQM with a 1.7 V
I(cm)
common-mode input level.
Figure 16
provides an example of a connection to an AQM with a 3.3 V
I(cm)
common-mode input level.
Fig 14. 2 V
o(p-p)
differential output with transformer
001aaj818
50
Ω
100
Ω
100
Ω
IOUTnP/IOUTnN; V
o(cm)
= 2.7 V; V
o(dif)(p-p)
= 2 V
IOUTnP
IOUTnN
0 mA to 20 mA
4:1
0 mA to 20 mA
V
DDA(3V3)
62
Ω
V
DDA(3V3)
V
DDA(3V3)
Fig 15. An example of a DC interface to a 1.7 V
I(cm)
AQM
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)
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