Microchip Technology ATR2732-PBPW

Overview

ATR2732-PBPW from Atmel (now Microchip Technology) is a highly integrated DAB front-end IC for Band III (174–240 MHz) and L-band (1452–1492 MHz) reception, featuring dual fractional PLLs, fully integrated VCOs, on-chip reference oscillator with digital tuning, and three-stage IF gain control. It delivers –98 dBm VHF sensitivity and –96 dBm L-band sensitivity at 8 dB SNR, operating from a single 3.3 V supply in automotive and portable DAB radio systems.

For engineers reviewing the ATR2732-PBPW datasheet, ATR2732-PBPW pinout, ATR2732-PBPW application, or ATR2732-PBPW equivalent, key selection criteria include its QFN64 package, SPI-controlled AGC architecture, VHF/L-band dual-band support, integrated filter-tuning DACs, and compatibility with the ATR2740 baseband processor.

Technical Context

The ATR2732-PBPW implements two independent RF signal paths: one for VHF Band III using a fractional-N PLL with 200–290 MHz LO and another for L-band using an integer PLL with 1.26–1.27 GHz LO. Both paths integrate LNAs, mixers, and programmable gain stages, with AGC loops controlling RF, mixer, and IF amplifiers via external capacitors.

Its clocking engine includes a digitally tunable crystal oscillator (16–32 MHz, ±210 ppm tuning range), dual programmable reference dividers (6-bit + 3-bit), and a 13-bit main divider supporting N/N+1 fractional synthesis. Filter alignment is enabled by three DAC outputs (VFIL1–VFIL3) and a reference-tank interface (TNKREFO/TNKREFI/VTNKREF).

Key Specifications

Pinout & Package

ATR2732-PBPW uses a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Atmel preliminary datasheet 4918AS–DAB–03/06, including dedicated supply, ground, RF/IF differential I/O, PLL/VCO control, filter-tuning DAC outputs, and SPI interface signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DAB front-end applications.

Compared with Si2151-A10-GM and MAX2175ETJ+, the ATR2732-PBPW uniquely delivers dual-band analog IF output with hardware-accelerated filter tuning and direct ATR2740 interoperability-making it irreplaceable in existing Atmel DAB reference platforms without PCB or firmware changes.

Availability

ATR2732-PBPW is available at Aetrix Electronics and suitable for commercial DAB receivers, automotive infotainment systems, and portable DAB radios requiring stable component supply, long-term lifecycle support, and qualified sourcing for production ramp.

Supply support for ATR2732-PBPW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology (formerly Atmel) is a global semiconductor company specializing in microcontrollers, analog, FPGA, and wireless solutions, with deep expertise in automotive, industrial, and consumer communications ICs.

The ATR2732 product line was developed specifically for digital audio broadcasting (DAB) front-end applications, integrating RF, IF, PLL, and tuning functions into a single SiGe BiCMOS die to minimize external components and accelerate DAB system design.

FAQ

What is the primary function of the ATR2732-PBPW in a DAB system?

The ATR2732-PBPW serves as a monolithic DAB front-end IC that performs RF amplification, downconversion, IF amplification, AGC control, and clock generation for both VHF Band III (174–240 MHz) and L-band (1452–1492 MHz). It interfaces directly with the ATR2740 baseband processor and outputs a 38.912 MHz IF signal. Its integrated fractional PLLs, VCOs, and filter-tuning DACs eliminate the need for discrete tuning components in production DAB receivers.

Does the ATR2732-PBPW support both VHF and L-band DAB reception simultaneously?

Yes, the ATR2732-PBPW supports concurrent VHF and L-band DAB reception through physically separate RF paths: a VHF LNA/mixer with fractional-N PLL and an L-band LNA/mixer with integer PLL. The device does not process both bands at the exact same instant but enables rapid band switching via SPI register reconfiguration, with hardware-assisted filter tuning for each band using dedicated DAC outputs (VFIL1–VFIL3) and tank references.

What are the critical supply voltage requirements for the ATR2732-PBPW?

The ATR2732-PBPW requires a nominal 3.3 V supply across multiple rails: VCC (3.0–3.5 V) for analog core, VDI (1.65–3.6 V) for SPI interface level adaptation, and dedicated supplies for LNAs (VALNA), mixers (VAMIXL), VCOs (VAVCOL/VAVCOV), and digital circuits (VDD). All supplies must be well-decoupled; the exposed thermal pad must be soldered to a solid ground plane for thermal and electrical integrity.

How does the ATR2732-PBPW implement automatic filter tuning for VHF antennas?

The ATR2732-PBPW implements automatic VHF filter tuning using three integrated 8-bit DACs (VFIL1, VFIL2, VFIL3) and a reference-tank circuit (TNKREFO/TNKREFI/VTNKREF). In Loop/Offset mode-which is recommended-the DACs generate tuning voltages referenced to a temperature-compensated varactor tank, enabling real-time alignment of external VHF antenna and preselection filters across operating temperature and frequency.

Is the ATR2732-PBPW pin-compatible with other variants in the ATR2732 family?

Yes, the ATR2732-PBPW is pin-compatible with the ATR2732-PBQW variant, sharing identical QFN64 (9 mm × 9 mm) mechanical footprint, thermal pad layout, and pin assignment per datasheet 4918AS–DAB–03/06. Both variants differ only in tape-and-reel packaging specifications and moisture sensitivity level (MSL), not in electrical or functional behavior-enabling direct substitution in manufacturing without PCB revision.