Overview
The ADRF6821ACPZ from Analog Devices Inc. is a highly integrated, dual radio frequency (RF) input, zero intermediate frequency (IF)/low IF RFIC receiver. This component is designed with a quadrature demodulator, digital step attenuator (DSA), IF linear amplifiers, an integrated fractional-N phase-locked loop (PLL), and a low phase noise, multicore, voltage-controlled oscillator (VCO). It is particularly suited for communication digital predistortion (DPD) systems and supports two single-ended, 50 Ω terminated RF inputs through its high isolation 2:1 RF switch and on-chip wideband RF balun.
Key Specifications
| Parameter | Test Conditions/Comments | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| RF Frequency Range | 450 | 2800 | MHz | ||
| Input Impedance | 50 | 50 | Ω | ||
| Demodulation Bandwidth | Fixed LO frequency, any 75 MHz bandwidth (BW) | 0.1 | ns | ||
| Demodulation Bandwidth | Fixed LO frequency, any 280 MHz bandwidth (BW) | 0.2 | ns | ||
| Output Impedance | I/Q outputs terminated with 100 Ω differential loads | 10 | Ω | ||
| Output DC Offset | No correction | 40 | mV | ||
| Output DC Offset | Correction applied | 2 | mV | ||
| Supply Voltage | 3.3 | V | |||
| Package | 56-WFQFN Exposed Pad |
Key Features
- Integrated RF balun for single-ended 50 Ω input
- Integrated VCO to cover complete RF input range
- Digital programmable LO phase offset and dc nulling
- Programmable via 4-wire SPI
- High linearity IF amplifiers following the demodulator
- Digital step attenuator (DSA) with 15 dB attenuation range and 1 dB step size
- High isolation 2:1 RF switch
- Fractional-N phase-locked loop (PLL)
- Low phase noise, multicore VCO
Applications
- Cellular W-CDMA/GSM/LTE DPD receivers
- Microwave, point-to-point radios
- Communication digital predistortion (DPD) systems
Q & A
- What is the RF frequency range of the ADRF6821ACPZ?
The RF frequency range is from 450 MHz to 2800 MHz.
- What type of package does the ADRF6821ACPZ use?
The component is packaged in a 56-WFQFN Exposed Pad.
- What is the supply voltage for the ADRF6821ACPZ?
The supply voltage is 3.3 V.
- What is the attenuation range of the digital step attenuator (DSA)?
The DSA offers an attenuation range of 15 dB with a step size of 1 dB.
- What are the key applications of the ADRF6821ACPZ?
The key applications include cellular W-CDMA/GSM/LTE DPD receivers and microwave, point-to-point radios.
- How is the ADRF6821ACPZ programmed?
The component is programmable via a 4-wire SPI interface.
- What are the notable features of the VCO in the ADRF6821ACPZ?
The VCO is a low phase noise, multicore VCO.
- What is the demodulation bandwidth of the ADRF6821ACPZ?
The demodulation bandwidth can be up to 280 MHz with a group delay ripple of 0.2 ns.
- Does the ADRF6821ACPZ have an integrated RF balun?
Yes, it has an integrated RF balun for single-ended 50 Ω input.
- What is the output impedance of the I/Q outputs?
The output impedance is 10 Ω when terminated with 100 Ω differential loads.
