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DAC1403D160 Datasheet(PDF) 6 Page - Integrated Device Technology

No. de pieza DAC1403D160
Descripción Electrónicos  Dual 14 bits DAC, up to 160 MHz, 2 x interpolating
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Fabricante Electrónico  IDT [Integrated Device Technology]
Página de inicio  http://www.idt.com
Logo IDT - Integrated Device Technology

DAC1403D160 Datasheet(HTML) 6 Page - Integrated Device Technology

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DAC1403D160 3
© IDT 2012. All rights reserved.
Product data sheet
Rev. 03 — 2 July 2012
6 of 18
Integrated Device Technology
DAC1403D160
Dual 14 bits DAC, up to 160 MHz, 2 x interpolating
7. Functional description
The Digital-to-Analog Converter (DAC) is a segmented architecture composed of a 7-bit
thermometer sub-DAC and the remaining 7-bit in a binary weighted sub-DAC.
The device produces two complementary current outputs on both channels, respectively
pins IOUT/IOUTN and QOUT/QOUTN which need to be connected via a load resistor to
the ground.
Figure 3 shows the equivalent analog output circuit of one DAC, which consists of a
parallel combination of PMOS current sources and associated switches for each segment.
The cascade source configuration enables the increasing of the output impedance of the
source and set to improve the dynamic performance of the DAC by introducing less
distortion.
Figure 4 shows the internal reference configuration. In this case the bias current is given
by the output of the internal regulator connected to the inverting input of the internal
operational amplifiers, while external resistors RI and RQ are connected respectively to
pins IVIRES and QVIRES. Thus the output current of the two DACs is typically fixed to
20 mA with an appropriate choice of these resistors. This configuration is optimal for
temperature drift compensation because the band gap can be matched with the voltage
on the feedback resistors.
The relation between full-scale output current IO(fs) and the RI (RQ) is:
RI
2048 VGAPOUT
82 IOfs

-----------------------------------------
=
The output current can also be adjusted by imposing an external reference voltage to the
inverting input pin GAPOUT and disabling the internal band gap with pin GAPD set to
HIGH. At a voltage lower than 1.2 V the current can be set at values lower than 20 mA.
The input references at pins IVIRES and QVIRES may also be driven by separate
reference voltages to adjust independently the two DAC currents.
014aaa514
AGND
RL
RL
AGND
IOUT/QOUT
IOUTN/QOUTN
DAC1403D160
014aaa515
QVIRES
IVIRES
GAPOUT
AGND
GAPD
INTERNAL
BAND GAP
I DAC current
sources array
DAC1403D160
Q DAC current
sources array
RI
RQ
Fig 3. Equivalent analog output circuit
Fig 4. Internal reference configuration


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