Preliminary Technical Data
UG-1828
Rev. PrC | Page 229 of 338
RF PORT INTERFACE INFORMATION
The RF ports of the ADRV9001 consisting of the transmit (TX1±, TX2±) and the receive ports (RX1A±, RX1B±, RX2A±, and RX2B±)
support a operational frequency range from 30 MHz to 6 GHz. This wide frequency range fulfils the requirements of many application
space. However, for optimized performance within a narrowband with minimal amplitude roll off and optimized linearity and noise
performance, the RF ports will must be impedance-matched.
This User Guide provides some example impedance matching networks for a selection of frequency bands. Locating a balun/transformer
to cover the entire frequency range of the ADRV9001 with minimal phase and amplitude imbalance proves to be a challenging task given
limited selection of commercially available baluns. For this reason, the example RF matching networks were chosen based on the available
baluns/transformers and RF trace implementations on evaluation PCB.
The matching networks are divided into two categories, wideband and narrowband. The wideband matching networks cover a range of
almost 3 GHz and possess more amplitude roll off as compared to the narrowband match. This roll off is often dominated by the
characteristic performance of the balun/transformer. For more optimized performance within a narrowband, the frequency specific
narrowband matches are recommended.
TRANSMIT PORTS: TX1± AND TX2±
The ADRV9001 uses a direct conversion transmitter architecture consisting of two identical and independently controlled TX channels.
The differential output impedance of transmitter outputs is matched to 50 Ω as shown in Figure 209. Additionally, the TX outputs must
be biased to a low noise 1.8 V supply.
RECEIVE PORTS: RX1A±, RX1B±, RX2A±, AND RX2B±
The ADRV9001 has two RF inputs for each receiver to accommodate different matching for each RF bands of interest. The mixer
architecture is very linear and inherently wideband which facilitates wideband impedance matching. The differential input impedance of
the RX inputs are 100Ω as shown in Figure 210 and Figure 211.
When selecting a balun/transformer for the receive paths a 2:1 impedance transformation is required to accommodate the 50 Ω single-
ended impedance to 100 Ω differential impedance as required by the ADRV9001 RX inputs.
The receiver input pins are self-biased internally to 650mV and therefore will require AC coupling/DC blocking capacitors at its inputs.
EXTERNAL LO PORTS: LO1± AND LO2±
Two external LO inputs (LO1 and LO2) can be applied to ADRV9001 and each external LO signal can be used for any of two receivers or
two transmitters instead of internally generated LO signal. AC-coupling interface is needed for both positive and negative sides of
external LO input pins which are internally biased. Similar to RX RF interface, a balun with 2:1 impedance transformation is necessary to
accommodate the 50 Ω single-ended impedance to 100 Ω differential impedance as required by the ADRV9001 Ext LO inputs.
DEVICE CLOCK PORT: DEV_CLK1±
There are two low-frequency (below 100MHz) clock interface modes and a LVDS type clock interface mode that can support clock signal
running as fast as 1GHz. For the high frequency clock interface, off-chip 100 ohm resistive termination will be required along with ac-
coupling caps. More information is available on the subsequent section named connection for external device clock.
RF RX/TX PORTS IMPEDANCE DATA
This section provides the port impedance data for all transmitters and receivers in the ADRV9001 integrated transceiver. Please note the
following:
•
The reference plane for this data is the ADRV9001 ball pads.
•
Single-ended mode port impedance data is not available. However, a rough assessment is possible by taking the differential mode
port impedance data and dividing both the real and imaginary components by 2.
Contact Analog Devices Applications Engineering for the impedance data in Touchstone format.
