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DAC1653Q Datasheet(HTML) 88 Page - Integrated Device Technology

Part No. DAC1653Q
Description  Quad 16-bit DAC: 10 Gbps JESD204B interface: up to 1.50
Download  101 Pages
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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DAC1653Q Datasheet(HTML) 88 Page - Integrated Device Technology

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DAC1653Q/DAC1658Q
© IDT 2013. All rights reserved.
Advance data sheet
Rev. 1.03 — 13 May 2013
88 of 101
Integrated Device Technology
DAC1653Q/DAC1658Q
Quad 16-bit DAC: 10 Gbps JESD204B interface; up to 1.50 Gsps
11.9 Output interfacing configuration
11.9.1 DAC1658Q: High common-mode output voltage
11.9.1.1 Basic output configuration
Using a differentially coupled transformer output provides optimum distortion
performance. In addition, it helps to match the impedance and provides electrical
isolation.
The DAC1658Q can generate a differential output of 1 V (p-p). In this configuration,
connect the center tap of the transformer to a 25
 resistor, which is connected to the
3.3 V analog power supply. This adjusts the DC common-mode to around 3.05 V
(see Figure 56).
11.9.1.2 Low input impedance IQ-modulator interface
The DAC1658Q 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 57 shows an example of a connection between the DAC1658Q and a low input
impedance modulator.
Fig 56. 1 V (p-p) differential output with transformer
50 Ω
2:1
50 Ω
IOUTx_P
DAC
IOUTA_P/IOUTA_N
IOUTB_P/IOUTB_N
VO(cm) = 3.05 V
VO(dif) = 1 V
IOUTx_N
3.3 V
25 Ω
50 Ω
3.3 V
3.3 V
0 mA to 20 mA
0 mA to 20 mA


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