ADL5375-05ACPZ-R7 RF/IF and RFID

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Description

The ADL5375 is a broadband quadrature modulator designed to operate from 400 MHz to 6 GHz. Its excellent phase accuracy and amplitude balance characteristics enable it to provide high performance IF or direct RF modulation for communication systems. The ADL5375 has a wide baseband bandwidth with output gain flatness that does not vary more than 1 dB from 450 MHz to 3.5 GHz. These features, along with a broadband output return loss of ≤-12 dB, make the ADL5375 ideal for broadband zero-IF or low-IF-to-RF applications, broadband digital predistortion transmitters, and multiband radio designs. The ADL5375 accepts two differential baseband inputs and a single-ended LO. It produces a single-ended 50 Ω output. The two versions are available with input baseband bias levels of 500 mV (ADL5375-05) and 1500 mV (ADL5375-15). The ADL5375 is fabricated using an advanced silicon germanium bipolar process. It is available in a 24-lead, exposed pad, Pb-free LFCSP_VQ package. It is specified for operation over the −40°C to +85°C temperature range. A Pb-free evaluation board is also available.

Features

   1. Output frequency range: 400 MHz to 6 GHz

   2. 1 dB output compression: ≥9.4 dBm (450 MHz to 4 GHz)

   3. Output return loss ≤ 12 dB (450 MHz to 4.5 GHz)

   4. Noise floor: −160 dBm/Hz (900 MHz)

   5. Sideband suppression: ≤−50 dBc (900 MHz)

   6. Carrier feedthrough: ≤−40 dBm (900 MHz)

   7. IQ3dB bandwidth: ≥ 750 MHz

   8. Baseband input bias level

       - ADL5375-05: 500 mV

       - ADL5375-15: 1500 mV

   9. Single supply: 4.75 V to 5.25 V

 10. 24-lead LFCSP_VQ Package

Application scenarios

   1. Wireless infrastructure:

       - 5G mMIMO RF unit

       - LTE base station transmit chain

   2. Military electronics:

       - Software defined radio (SDR)

       - Electronic countermeasure system

   3. Test equipment:

       - Vector signal generator

       - Microwave tester

Pin configuration (LFCSP-32)

Typical application block diagram

┌───────────────┐

  │  Baseband I/Q signal      │

  └──────┬───────┬──┘

                   │                  │

   ┌─────▼─────┐   │

   │ 100Ω differential   │   │

   │ Input network    │  │

   └─────┬─────┘  │

                  │                 │

   ┌─────▼───────▼──┐

   │   ADL5375                       │

   │   Modulator                 ├──▶ RFoutput

   └─────┬───────┬──┘

                  │                  │

  ┌──────▼───────▼──┐

  │ Local oscillator (LO) input │

  │ (0dBm typical drive)          │

  └─────────────────┘

Key points of design

   1. LO drive requirements:

       - Recommended drive level: 0dBm ±3dB

       - Required DC blocking capacitor: 100nF (C0G material)

   2. Baseband processing:

       - It is recommended to use differential drivers such as ADA4927

       - A matching network is required to eliminate DC bias

   3. PCB material:

       - Recommended Rogers RO4350B (εr=3.48)

       - Microstrip line impedance control 50Ω±5%

Performance curve

   1. Frequency conversion gain:

       - Typical value -1dB @2.4GHz

       - Slope with frequency change 0.15dB/GHz

   2. Noise figure:

       - 12dB (DSB) @1.9GHz

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