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TQP519021 Datasheet(PDF) 11 Page - TriQuint Semiconductor

Part No. TQP519021
Description  680-920 MHz High IP3 Dual Channel Downconverter
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Maker  TRIQUINT [TriQuint Semiconductor]
Homepage  http://www.triquint.com
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TQP519021 Datasheet(HTML) 11 Page - TriQuint Semiconductor

 
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TQP519021
680-920 MHz High IP3 Dual Channel Downconverter
Data Sheet: Rev C 12/20/2012
- 11 of 14 -
Disclaimer: Subject to change without notice
© 2012 TriQuint Semiconductor, Inc.
Connecting the Digital World to the Global Network®
Detailed Device Description
The TQP519021 is a high-linearity diversity dual-channel down-converter designed to meet the demanding performance,
functionality, and cost goals of current and next generation mobile infrastructure base stations. This device is fully integrated diversity
mixer that includes LO switch, two stage LO drivers, high-linearity mixers, RF balun and IF amplifiers. A single pole double throw
(SPDT) high isolation switch has been included to select between two different LO inputs for frequency hopping applications. IF
amplifiers can be set to standard current or low current mode through logic input pins. The TQP519021 also integrates power
down feature controlled by separate logic pin.
RF Port
The single-ended RF input ports of both the main and diversity channels are internally matched to 50Ω, requiring no external
matching components and DC-blocking capacitor. The RF input is internally transformed to a balanced signal using an internal,
on-chip unbalanced-to-balanced (balun) transformer. The RF balun can support an RF input frequency range of 600-1200 MHz.
LO Drivers and LO switch
The TQP519021 is optimized for a 600MHz to 1100MHz LO frequency range. The two stage LO drivers allow the LO input
power to be in the range of ±3 dBm. The LO section is optimized for low-side LO injection but also works for high-side LO
applications with slightly degraded linearity performance.
As an added feature, a single pole double throw (SPDT) switch has been included to select between two different LO inputs for
frequency hopping applications. The SPDT switch selects one of the two single-ended LO ports providing greater than 50 dB of
LO1 to LO2 isolation. LO switching time is typically 100ns. The switch is controlled by a digital input (LOSEL), where logic-high
selects LO1 and logic-low selects LO2. LO1 and LO2 inputs are internally matched to 50Ω, requiring only 100pF DC-blocking
capacitors.
Passive Double-Balanced Mixer
The TQP519021 consists of a passive, double balanced, high-performance mixer that provides a very low conversion loss and
high IIP3. Additionally, the balanced nature of the mixer provides for high channel to channel isolation.
IF Amplifiers
The TQP519021 has an IF frequency range of 70 – 280 MHz, where the low-end frequency depends on the frequency response
of the external IF components. The IF amplifiers follow the passive mixers in the signal path and can be operated outside of this
range, but with a slight degradation in performance. The outputs require a supply voltage connection using inductive chokes.
The differential output impedance of the IF amplifier is approximately 200 Ω. If operation in a 50 Ω system is desired, the output
can be transformed to 50 Ω by using a 4:1 transformer. One can use a differential IF amplifier on the mixer IF ports, but a DC
block is required on both IFD+/IFD- and IFM+/IFM- ports to keep external DC from entering the IF ports of the mixer. These
differential ports are ideal for providing better IIP2 performance.
Standard Current Mode and Low Current Mode
IF amplifiers can be set to standard current or low current mode through logic input pins. The IFD_CURR_SET and
IFM_CURR_SET pins (17 and 29, respectively) are used to reduce the IF amplifier bias current. On the evaluation board, this is
achieved by setting jumpers J10 and J12 as explained under Application Board section. The low current mode degrades IIP3
performance. The total current draw with low current mode is about 100mA lower than standard current mode. The
IFD_CURR_SET and IFM_CURR_SET pins can be left either NC or GND for the applications not using low current mode.
Shutdown Mode
The TQP519021 has additional integrated feature of power shut down for IF amplifiers and LO amplifier. The IFD_SD and
IFM_SD pins (18 and 28, respectively) are used for IF amplifier shut down. The LOD_SD and LOM_SD pins (22 and 24,
respectively) are used for LO amplifier shut down. On the evaluation board, this is achieved by setting jumpers J11, J13, J16
and J9 as explained under Application Board section. The total current draw during shut down mode is 3.5mA. The IFD_SD and
IFM_SD pins can be left either NC or GND for the applications not using shutdown mode.
For any further technical questions, please email to
sjcapplications.engineering@tqs.com.


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