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ADL5375-05 Datasheet(PDF) 1 Page - Analog Devices
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ADL5375-05 Datasheet(HTML) 1 Page - Analog Devices
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Circuit Designs Using Analog Devices Products
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Dual 16-Bit, 1 GSPS DAC
400 MHz to 6000 MHz I/Q Modulator
Interfacing the ADL5375 I/Q Modulator to the AD9779A
Dual-Channel, 1 GSPS High Speed DAC
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engineers. Standard engineering practices have been employed in the design and construction of
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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
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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.
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
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
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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