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ADL5375-05 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADL5375-05
Description  Interfacing the ADL5375 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADL5375-05 Datasheet(HTML) 1 Page - Analog Devices

   
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Circuit Note
CN-0021
Circuit Designs Using Analog Devices Products
Apply these product pairings quickly and with confidence.
For more information and/or support call 1-800-AnalogD
(1-800-262-5643) or visit www.analog.com/circuit.
Devices Connected/Referenced
AD9779A
Dual 16-Bit, 1 GSPS DAC
ADL5375-05
400 MHz to 6000 MHz I/Q Modulator
Interfacing the ADL5375 I/Q Modulator to the AD9779A
Dual-Channel, 1 GSPS High Speed DAC
Rev. A
“Circuits from the Lab” from Analog Devices have been designed and built by Analog Devices
engineers. Standard engineering practices have been employed in the design and construction of
eachcircuit,andtheirfunctionandperformance havebeentestedandverifiedinalabenvironment
atroomtemperature.However,youaresolelyresponsible fortestingthe circuit anddetermining its
suitability and applicability for your use and application. Accordingly, in no event shall Analog
Devices be liable for direct, indirect, special, incidental, consequential or punitive damages due to
anycausewhatsoeverconnectedtotheuseofany“CircuitfromtheLab”. (Continuedonlastpage)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008–2009 Analog Devices, Inc. All rights reserved.
CIRCUIT FUNCTION AND BENEFITS
This circuit provides a simple, elegant interface between the
ADL5375 I/Q modulator and the AD9779A high speed DAC.
The ADL5375 and the AD9779A are well-matched devices
because they have the same bias levels and similarly high
signal-to-noise ratios (SNR). The matched bias levels of 500 mV
allow for a “glueless” interface—there is no requirement for a
level shifting network that would add noise and insertion loss
along with extra components. The addition of the swing-
limiting resistors (RSLI, RSLQ) allows the DAC swing to be
scaled appropriately without loss of resolution or of the 0.5 V
bias level. The high SNR of each device preserves a high SNR
through the circuit.
CIRCUIT DESCRIPTION
The ADL5375 is designed to interface with minimal
components to members of Analog Devices family of
TxDAC® converters (AD97xx). The baseband inputs of the
ADL5375 require a dc common-mode bias voltage of 500 mV.
With each AD9779A output swinging from 0 mA to 20 mA, a
single 50 Ω resistor to ground from each of the DAC outputs
provides the desired 500 mV dc bias. With just the four 50 Ω
resistors in place, the voltage swing on each pin is 1 V p-p.
This results in a differential voltage swing of 2 V p-p on each
input pair.
By adding resistors RSLI and RSLQ to the interface, the output
swing of the DAC can be reduced without any loss of DAC
resolution. The resistor is placed as a shunt between each side of
RBIP
50
RBIN
50
93
92
OUT1_N
OUT1_P
IBBN
IBBP
AD9779A
ADL5375-05
RBQN
50
RBQP
50
84
83
OUT2_P
OUT2_N
QBBP
QBBN
21
22
9
10
RSLI
100
RSLQ
100
Figure 1. Interface Between the AD9779A and ADL5375 with 50 Ω Resistors to Ground to Establish the
500 mV DC Bias for the ADL5375-05 Baseband Inputs (Simplified Schematic)


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