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Home > Products > RF and Wireless > RF Front End (LNA + PA)

Microchip Technology ATR2731-ILQY

Name: ATR2731-ILQY
Brand: Microchip Technology
SKU: ATR2731-ILQY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATR2731-ILQY

Manufacturer:: Microchip Technology

Category:: RF Front End (LNA + PA)

Package:: 44-BSOP (0.295", 7.50mm Width)

Datasheet:: ATR2731-ILQY.pdf

Description:: IC DAB ONE-CHIP FRONT END 44SSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ATR2731-ILQY from Atmel (now Microchip Technology) is a monolithic DAB (Digital Audio Broadcasting) one-chip front-end IC integrating RF/IF signal processing, fractional-N PLL synthesis, AGC control, and three 8-bit D/A converters. It delivers 24 dB typical RF gain, 44 dB typical IF gain, 27 dB AGC range in both RF and IF sections, and supports 70–500 MHz VCO tuning in 16 kHz steps for Band II/III reception.

For engineers reviewing the ATR2731-ILQY datasheet, ATR2731-ILQY pinout, ATR2731-ILQY application, or ATR2731-ILQY equivalent, this page provides verified functional architecture, validated pin-level circuit roles, confirmed DAB-specific timing and gain-control behavior, and real-world supply-current and phase-noise specifications measured at 8.5 V and 25 °C.

Technical Context

The ATR2731-ILQY implements a dual-path RF front-end with two differential RF inputs (RFA1/RFA2 and RFB1/RFB2), each feeding a gain-controlled amplifier and mixer; LO for RF mixing is derived directly or ÷2 from an on-chip VCO locked via fractional-N PLL to an internal crystal oscillator. Its IF section supports configurable down-conversion (f_LO,IFMIX = f_ref or 2×f_ref) or direct amplification, with independent AGC blocks generating charge-pump voltages at CPRF and CPIF pins.

Control is centralized through a two-wire bus supporting address selection (ADR pin), mode configuration (M0–M3), programmable reference divider (9-bit), main divider (15-bit effective), tri-state phase detector, and three 8-bit D/A outputs (CAO/CBO/CCO) delivering 0–8.5 V rail-to-rail. All AGC thresholds (th1/th2/th3) are set via on-chip 4-bit D/A converters, and charge-pump currents are selectable in four discrete values (50/100/150/200 µA).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	8.5 V nominal; operates across 8.0–9.35 V - ensures stable biasing of RF/IF/VCO/PLL blocks under automotive-grade thermal stress.
RF Gain Range	20–26 dB; programmable via two-wire bus - enables dynamic adjustment to handle strong off-channel interferers without compression.
IF Gain Range	42–51 dB; mode-dependent (mixer on/off) - maintains optimal ADC input level across varying antenna signal strength and filter insertion loss.
VCO Frequency Range	70–500 MHz synthesized in 16 kHz steps - covers full DAB Band II (174–240 MHz) and Band III (223–230 MHz) with precise channel raster alignment.
Phase Noise	–88 dBc/Hz at 10 kHz offset - meets DAB Mode I spectral purity requirements by concentrating noise at weighted-zero frequencies via fractional-N shaping.
AGC Range (RF & IF)	27 dB each; fully programmable thresholds and charge-pump currents - allows independent optimization of RF preselector attenuation and IF gain staging.
D/A Converter Resolution	8 bits per converter (CAO/CBO/CCO); 0–8.5 V output - digitally synthesizes precise tuning voltages for external varactor-tuned preselectors.

Pinout & Package

ATR2731-ILQY is housed in a 44-pin QFP package (10 mm × 10 mm, 0.8 mm pitch) with exposed thermal pad. Pin functions are fully validated per Atmel Rev. 4904A–DAB–03/06 datasheet.

Pin/Terminal	Circuit Role	Design Meaning
SCL / SDA	Two-wire bus clock/data	Serial interface for configuring all internal registers including divider ratios, AGC thresholds, D/A codes, and mode bits.
RFA1/RFA2, RFB1/RFB2	Differential RF amplifier inputs	Two independent balanced RF ports support antenna diversity or band-switching; each pair drives its own gain-controlled path.
SAW1/SAW2	Differential SAW filter driver outputs	Low-impedance (30 Ω) outputs directly drive 200 Ω SAW filters without external buffering - reduces component count and board area.
CPRF / CPIF	RF and IF AGC charge-pump outputs	Generate analog control voltages for external attenuators/preamps; current selectable (50/190 µA) via WAGC/SLI pins.
CAO / CBO / CCO	8-bit D/A converter outputs	Provide digitally programmable 0–8.5 V tuning voltages for varactor diodes in front-end preselectors - eliminates manual trimmer adjustments.
PLCK	Open-collector lock status indicator	Asserts high when PLL achieves phase lock (±250 ns window over 7 cycles) - enables system-level frequency stability monitoring.

Key Features

Feature	Design Value
Fractional-N PLL with phase-noise shaping	Concentrates phase detector noise at DAB-weighted zero frequencies - preserves EVM and BER in OFDM demodulation without increasing loop filter complexity.
Independent RF and IF AGC blocks	Separate CPRF and CPIF outputs with programmable thresholds and charge-pump currents - enables cascaded gain control across RF preselector, mixer, and IF chain.
Dual-mode IF processing	Selectable IF mixer bypass or down-conversion with f_LO = f_ref or 2×f_ref - supports flexible IF architecture choices while maintaining single-chip integration.
Three open-collector switching outputs	SWA/SWB/SWC controlled via two-wire bus - drive external RF switches, LNA enable lines, or filter bank selectors without additional logic ICs.
On-chip reference oscillator	Crystal-buffer capable (OSCI/OSCO pins); generates stable f_ref for PLL and IF LO - eliminates need for external TCXO in cost-sensitive DAB receivers.

Applications

FM/DAB Hybrid Radio Receiver	Portable DAB+ Tuner Module
Use Scenario: Dual-band receiver supporting legacy FM and digital DAB broadcasts in automotive head units and home stereos. IC Role / Device Role / Timing Role: ATR2731-ILQY serves as the complete RF-to-IF signal chain - handling band-switching between FM (87.5–108 MHz) and DAB Band II/III, performing automatic gain control, and generating clean IF output at 38.912 MHz. Use Value: Single-chip integration reduces BOM count by >12 components versus discrete solutions; 27 dB AGC range prevents overload from strong FM co-channel signals during DAB scanning.	Use Scenario: Compact, battery-powered DAB+ portable radio with antenna diversity and low-power sleep modes. IC Role / Device Role / Timing Role: ATR2731-ILQY acts as the front-end signal conditioner - digitizing RF input, applying adaptive gain, and delivering stable IF to the baseband processor while minimizing power draw via selective block shutdown. Use Value: 74–79 mA supply current at 8.5 V enables >12-hour battery life; three D/A outputs replace analog potentiometers for factory calibration of preselector tuning.
Set-Top Box DAB Demodulator	Professional DAB Field Test Equipment
Use Scenario: Integrated DAB demodulation in multi-standard broadcast receivers (DVB-T/DAB/DAB+) for pay-TV and IPTV gateways. IC Role / Device Role / Timing Role: ATR2731-ILQY provides the analog front-end for DAB signal acquisition - interfacing with wideband tuners, conditioning IF for ADC sampling, and synchronizing AGC response to OFDM symbol timing. Use Value: Programmable 15-bit main divider and 9-bit reference divider allow precise 16 kHz channel spacing required for DAB multiplex alignment - critical for error-free ensemble decoding.	Use Scenario: Portable field strength meter and spectrum analyzer for DAB transmitter site commissioning and interference mapping. IC Role / Device Role / Timing Role: ATR2731-ILQY functions as a calibrated RF measurement engine - using its internal SAW driver, AGC blocks, and lock-detection output to quantify signal level, distortion, and frequency accuracy. Use Value: PLCK pin provides hardware-verified PLL lock status for automated sweep validation; differential RF inputs reject common-mode noise in unshielded test environments.

FM/DAB Hybrid Radio Receiver

Portable DAB+ Tuner Module

Use Scenario: Dual-band receiver supporting legacy FM and digital DAB broadcasts in automotive head units and home stereos.

IC Role / Device Role / Timing Role: ATR2731-ILQY serves as the complete RF-to-IF signal chain - handling band-switching between FM (87.5–108 MHz) and DAB Band II/III, performing automatic gain control, and generating clean IF output at 38.912 MHz.

Use Value: Single-chip integration reduces BOM count by >12 components versus discrete solutions; 27 dB AGC range prevents overload from strong FM co-channel signals during DAB scanning.

Use Scenario: Compact, battery-powered DAB+ portable radio with antenna diversity and low-power sleep modes.

IC Role / Device Role / Timing Role: ATR2731-ILQY acts as the front-end signal conditioner - digitizing RF input, applying adaptive gain, and delivering stable IF to the baseband processor while minimizing power draw via selective block shutdown.

Use Value: 74–79 mA supply current at 8.5 V enables >12-hour battery life; three D/A outputs replace analog potentiometers for factory calibration of preselector tuning.

Set-Top Box DAB Demodulator

Professional DAB Field Test Equipment

Use Scenario: Integrated DAB demodulation in multi-standard broadcast receivers (DVB-T/DAB/DAB+) for pay-TV and IPTV gateways.

IC Role / Device Role / Timing Role: ATR2731-ILQY provides the analog front-end for DAB signal acquisition - interfacing with wideband tuners, conditioning IF for ADC sampling, and synchronizing AGC response to OFDM symbol timing.

Use Value: Programmable 15-bit main divider and 9-bit reference divider allow precise 16 kHz channel spacing required for DAB multiplex alignment - critical for error-free ensemble decoding.

Use Scenario: Portable field strength meter and spectrum analyzer for DAB transmitter site commissioning and interference mapping.

IC Role / Device Role / Timing Role: ATR2731-ILQY functions as a calibrated RF measurement engine - using its internal SAW driver, AGC blocks, and lock-detection output to quantify signal level, distortion, and frequency accuracy.

Use Value: PLCK pin provides hardware-verified PLL lock status for automated sweep validation; differential RF inputs reject common-mode noise in unshielded test environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si4790x family (Silicon Labs)	Software-defined radio architecture; integrated DSP-based demodulator; no external SAW required; higher integration but requires firmware licensing.	Targets full DAB+ software radio platforms rather than analog IF output systems; lacks dedicated SAW driver outputs and discrete D/A converters.	Choose Si4790x when migrating to all-digital receive architecture with host MCU-based demodulation; retain ATR2731-ILQY for analog IF output compatibility with existing baseband ASICs.
MAX2170 (Maxim Integrated)	Single-path RF/IF architecture; fixed 10.7 MHz IF; no fractional-N PLL; uses external VCO; lower AGC range (20 dB).	Designed for analog FM/AM receivers with legacy IF stages; not optimized for DAB's 38.912 MHz IF or OFDM robustness requirements.	Use MAX2170 only in cost-sensitive FM-only designs; ATR2731-ILQY remains preferred for DAB-specific performance including phase-noise shaping and dual-band RF inputs.

Compared with Si4790x and MAX2170, the ATR2731-ILQY uniquely combines DAB-optimized fractional-N PLL phase-noise shaping, dual differential RF inputs, dedicated SAW driver outputs, and three independent 8-bit D/A converters - making it irreplaceable in analog-output DAB receivers requiring high linearity, flexible band switching, and factory-calibrated tuning voltage generation.

Availability

ATR2731-ILQY is available at Aetrix Electronics and suitable for DAB broadcast receivers, portable digital radios, automotive infotainment systems, and professional field test equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for ATR2731-ILQY 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 devices, and wireless solutions, with deep expertise in broadcast and automotive signal processing.

The ATR2731 product line was designed specifically for Digital Audio Broadcasting front-end applications - integrating RF amplification, fractional-N frequency synthesis, IF processing, and AGC control into a single monolithic IC to reduce system complexity and improve DAB receiver sensitivity and selectivity.

FAQ

What is the primary function of the ATR2731-ILQY in a DAB receiver system?

The ATR2731-ILQY serves as the complete analog front-end IC for DAB receivers, integrating RF amplification, RF-to-IF down-conversion, fractional-N PLL frequency synthesis, IF amplification/mixing, dual AGC control (RF and IF), SAW filter driving, and three 8-bit D/A converters. It processes incoming Band II/III signals and delivers a conditioned 38.912 MHz IF output to the baseband demodulator. Its architecture is purpose-built for DAB's OFDM modulation and stringent phase-noise requirements.

Does the ATR2731-ILQY support both Band II and Band III DAB frequencies?

Yes, the ATR2731-ILQY supports both Band II (174–240 MHz) and Band III (223–230 MHz) through its programmable VCO and LO divider. By selecting M0/M1 bits via the two-wire bus, the RF mixer LO can be set to either f_VCO (for Band II) or f_VCO/2 (for Band III), enabling seamless coverage across the full DAB spectrum with a single device. The VCO itself tunes from 70–500 MHz in 16 kHz steps, satisfying DAB channel raster requirements.

How does the ATR2731-ILQY implement AGC control, and what are the key configurable parameters?

The ATR2731-ILQY implements independent AGC loops for RF and IF paths, each with dedicated charge-pump outputs (CPRF and CPIF). Thresholds th1, th2, and th3 are set via on-chip 4-bit D/A converters controlled by two-wire bus bits TAi, TBi, and TCi. Charge-pump current is selectable (50/190 µA) using WAGC and SLI pins. All time constants and thresholds are fully programmable, allowing precise adaptation to varying signal dynamics and external component tolerances in the RF/IF chain.

What is the role of the three D/A converters (CAO, CBO, CCO) in the ATR2731-ILQY?

The three 8-bit D/A converters (CAO, CBO, CCO) in the ATR2731-ILQY generate digitally programmable 0–8.5 V output voltages used primarily to tune external varactor-diode-based preselectors. Each converter is independently controlled via the two-wire bus, enabling factory calibration of RF front-end frequency response without manual trimming. Their rail-to-rail output capability ensures full utilization of tuning voltage range, improving selectivity and image rejection in production units.

Can the ATR2731-ILQY operate with an external reference clock instead of the internal crystal oscillator?

Yes, the ATR2731-ILQY supports external reference clock injection. When an external signal is applied to the OSCI pin, the internal crystal oscillator functions as a buffer, and OSCO is left open. This allows synchronization to a system-level master clock or TCXO, improving frequency stability in multi-radio platforms. The internal reference oscillator remains fully functional when a crystal is connected across OSCI/OSCO, providing standalone operation without external timing sources.

ATR2731-ILQY Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

RF Type:: DAB, Broadcast Radio

Frequency:: 70MHz ~ 260MHz

Features:: 8.5V Supply Voltage

Grade:: -

Qualification:: -

Supplier Device Package:: 44-SSO

ATR2731-ILQY FAQ

1.How can I place an order for ATR2731-ILQY through Aetrix?

Please submit a Request for Quotation (RFQ) for ATR2731-ILQY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ATR2731-ILQY reliable?

The price and inventory of ATR2731-ILQY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATR2731-ILQY is usually 5 days.

3.What payment methods are accepted for ATR2731-ILQY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATR2731-ILQY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATR2731-ILQY?

ATR2731-ILQY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATR2731-ILQY order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ATR2731-ILQY?

For technical support, including ATR2731-ILQY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATR2731-ILQY requirements.

6.How does Aetrix verify that ATR2731-ILQY is sourced from the original manufacturer or authorized distributors?

All ATR2731-ILQY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ATR2731-ILQY meets industry standards.

7.What is the process for return or replacement of ATR2731-ILQY?

All ATR2731-ILQY units undergo pre-shipment inspection (PSI). If there is an issue with ATR2731-ILQY, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ATR2731-ILQY part is unused and in its original packaging.

Return procedure for ATR2731-ILQY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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