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DAC1653Q Datasheet(HTML) 89 Page - Integrated Device Technology

Part No. DAC1653Q
Description  Quad 16-bit DAC: 10 Gbps JESD204B interface: up to 1.50
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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DAC1653Q Datasheet(HTML) 89 Page - Integrated Device Technology

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DAC1653Q/DAC1658Q
© IDT 2013. All rights reserved.
Advance data sheet
Rev. 1.03 — 13 May 2013
89 of 101
Integrated Device Technology
DAC1653Q/DAC1658Q
Quad 16-bit DAC: 10 Gbps JESD204B interface; up to 1.50 Gsps
11.9.1.3 IQ-modulator - DC interface
When the system operation requires to keep the DC component of the spectrum, the
DAC1658Q can use a DC interface to connect an IQ-modulator. In this case, the image of
the local oscillator can be canceled using the digital offset control in the device.
Figure 58 shows an example of a connection to an IQ modulator with a 1.7 V common
input level.
(1) If Rint = 100 , then Rext = not connected
(2) If Rint = 200  , then Rext = 200 
Fig 57. DAC1658Q with low input impedance IQ-modulator interface
IOUTA_P/IOUTB_P
3.3 V
DAC
IQ modulator
Rint = 100 Ω/200 Ω
50 Ω
Rext
Rint
50 Ω
IOUTA_N/IOUTB_N
AUXA_P/AUXB_P
AUXA_N/AUXB_N
BBA_P/BBB_P
BBA_N/BBB_N
0 mA to 20 mA
low pass
filter
IOUTA_P/IOUTA_N
IOUTB_P/IOUTB_N
VO(cm) = 2.7 V
VO(dif) = 1 V
Fig 58. IQ-modulator: DC interface with a 1.7 V common input level
IOUTA_P/IOUTB_P
5 V
DAC
68 Ω
54.9 Ω
54.9 Ω
68 Ω
84.5 Ω
84.5 Ω
IOUTA_N/IOUTB_N
BBA_P/BBB_P
BBA_P/BBA_N
BBB_P/BBB_N
VI(cm) = 1.7 V
VI(dif) = 0.92 V
IOUTA_P/IOUTA_N
IOUTB_P/IOUTB_N
VO(cm) = 2.78 V
VO(dif) = 1.52 V
IQ modulator
(VI(cm) = 1.7 V)
BBA_N/BBB_N
0 mA to 20 mA
100 Ω
low pass
filter


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