dac1405d650 NXP Semiconductors, dac1405d650 Datasheet - Page 32

• Manufacturer Part Number: dac1405d650
• Description: Dual 14-bit Dac, Up To 650 Msps; 2? 4? And 8? Interpolating
• Manufacturer: NXP Semiconductors

NXP Semiconductors
DAC1405D650_1
Product data sheet
10.14.1 Basic output configuration
10.14.2 DC interface to an Analog Quadrature Modulator (AQM)
10.14 Output configuration
The use of a differentially-coupled transformer output provides optimum distortion
performance (see
helps to match the impedance and provides electrical isolation.
The DAC1405D650 can operate up to 2 V
is recommended to connect the center tap of the transformer to a 62
to the 3.3 V analog power supply, in order to adjust the DC common mode to
approximately 2.7 V (see
When the system operation requires to keep the DC component of the spectrum, the
DAC1405D650 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
input level.
Fig 13. 1 V
Fig 14. 2 V
provides an example of a connection to an AQM with a 1.7 V
o(p-p)
o(p-p)
differential output with transformer
differential output with transformer
Figure 13 “1 V
DAC1405D650
Rev. 01 — 4 May 2009
DAC1405D650
Figure 14 “2 V
Dual 14-bit DAC, up to 650 Msps; 2 4 and 8 interpolating
IOUTN
IOUTP
IOUTP
IOUTN
o(p-p)
V
0 mA to 20 mA
0 mA to 20 mA
IOUTP/IOUTN
V
o(dif)(p-p)
o(cm)
differential output with
V
0 mA to 20 mA
0 mA to 20 mA
IOUTP/IOUTN
V
o(dif)(p-p)
o(cm)
o(p-p)
= 2.7 V
o(p-p)
= 2 V
= 2.8 V
differential output with
= 2 V
3.3 V
3.3 V
differential outputs. In this configuration, it
3.3 V
3.3 V
100
100
50
50
3.3 V
2:1
62
4:1
001aaj817
001aaj818
DAC1405D650
transformer”). In addition, it
50
50
transformer”).
i(cm)
resistor connected
© NXP B.V. 2009. All rights reserved.
common mode
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