DAC1617D1G0 Datasheet, PDF (42/78 Pages) Integrated Device Technology – Dual 16-bit DAC, LVDS interface, up to 1 Gsps, x2, x4 and x8 interpolating

Integrated Device Technology
DAC1617D1G0
Dual 16-bit DAC: up to 1 Gsps; x2, x4 and x8 interpolating
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Fig 30. 2 V (p-p) differential output with transformer
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10.20.2 Low input impedance IQ-modulator interface
The DAC1617D1G0 can be easily connected to low input impedance IQ-modulators. The
image of the local oscillator can be canceled using the digital offset control in the device.
Figure 31 shows an example of a connection between the DAC1617D1G0 and a low input
impedance modulator.
DAC
IOUTAP/IOUTBP
3.3 V
50 Ω
50 Ω
low pass
filter
IQ modulator
R_int = 100 Ω/200 Ω
BBAP/BBBP
Rext
Rint
IOUTAN/IOUTBN
0 mA to 20 mA
BBAN/BBBN
AUXAP/AUXBP
AUXAN/AUXBN
IOUTAP/IOUTAN
IOUTBP/IOUTBN
V_O(cm) = 2.7 V
V_O(dif) = 1 V
aaa-002450
(1) If R_int = 100 , then R_ext = not connected
(2) If R_int = 200  , then R_ext = 200 
Fig 31. DAC1617D1G0 with low input impedance IQ-modulator interface(To be updated)
10.20.3 IQ-modulator - DC interface
When the system operation requires to keep the DC component of the spectrum, the
DAC1617D1G0 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.
DAC1617D1G0 3
Preliminary data sheet
Rev. 03 — 2 July 2012
© IDT 2012. All rights reserved.
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