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Microchip Technology T2801-PLQ
- Part No.:
- T2801-PLQ
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
T2801-PLQ.pdf
- Description:
- IC RF TXRX ISM>1GHZ 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,066
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Product details
Overview
T2801-PLQ from Atmel is a fully integrated DECT transceiver IC in QFN48 package, implementing image-rejection mixer, IF amplifiers, FM demodulator, baseband filter, RSSI, TX preamplifier, ramp-signal generator, and closed-loop modulation compensation. It operates from 3.0 V to 4.6 V unregulated supply and delivers 0 dBm TX output at 1.9 GHz for low-power cordless telephony systems.
For engineers reviewing the T2801-PLQ datasheet, T2801-PLQ pinout, T2801-PLQ application, or T2801-PLQ equivalent, key selection considerations include its 1769–1934 MHz VCO tuning range, support for 10.368/13.824/20.736 MHz reference clocks, integrated auxiliary and VCO regulators, 54 mA TX / 85 mA RX current consumption, and QFN48 footprint with exposed thermal pad.
Technical Context
The T2801-PLQ implements a fractional-N PLL synthesizer with programmable main counter (32–35), swallow counter (0–31), and reference counter (3/4/6), enabling precise LO generation for DECT band operation. Its dual-VCO architecture supports independent RX (1769–1824 MHz) and TX (1881–1934 MHz) frequency synthesis with ±5% DAC-based pretuning and 40 MHz/V tuning gain.
It integrates advanced closed-loop modulation using a 6× oversampled modulation compensation circuit (MCC) and Gaussian filter (GF) with adjustable deviation scaling (60–130%), enabling unlimited multislot operation without mechanical tuning. The 3-wire serial bus controls all functional blocks including power-up sequencing (PU_REG, PU_VCO, PU_RX/TX, PU_PLL), TX/RX enable, and ramp-slope configuration via RAMP_SET capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 4.6 V unregulated - enables direct battery operation without external LDO |
| VCO Frequency Range | RX: 1769–1824 MHz; TX: 1881–1934 MHz - covers full DECT 1880–1900 MHz and extended bands |
| Reference Clock Inputs | 10.368 MHz / 13.824 MHz / 20.736 MHz - matches standard DECT timing and data rates |
| TX Output Power | 0 dBm typical at TX_OUT - drives external SiGe PA with integrated ramp control |
| RX Current Consumption | 85 mA at 3.2 V - optimized for portable DECT handsets with RSSI and IF amplification |
| TX Current Consumption | 54 mA (GF+MCC active: 58 mA) - supports burst-mode transmission with low average power |
| Package | QFN48, 7 mm × 7 mm, 0.5 mm pitch, 5.1 mm × 5.1 mm exposed pad - provides thermal efficiency and compact layout |
Pinout & Package
Package: QFN48, 7 mm × 7 mm body, 0.5 mm pitch, 5.1 mm × 5.1 mm exposed thermal pad per JEDEC MO-220.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLOCK, DATA, ENABLE | 3-wire serial programming interface | Configures PLL counters, VCO select, GF/MCC enable, and calibration DACs |
| REF_CLK | Reference clock input | AC-coupled 10.368/13.824/20.736 MHz sine wave - sets PLL phase detector frequency |
| LD | Lock detect output | Open-drain logic signal indicating PLL lock status - used for system synchronization |
| PU_REG, PU_VCO, PU_RX/TX, PU_PLL | Power-up control inputs | Enable/disable auxiliary regulator, VCO regulator, RX/TX blocks, and PLL independently for ultra-low standby current (10 µA) |
| RAMP_OUT, RAMP_SET | Ramp-signal generator outputs | RAMP_OUT drives external PA gate; RAMP_SET capacitor sets slew rate for compliant DECT power ramping |
| TX_OUT | TX driver amplifier output | Delivers 0 dBm into 100 Ω load - interfaces directly to external power amplifier stage |
| RSSI | Received signal strength indicator | Analog current output (0.45–2.25 µA) proportional to IF input level - enables AGC and link quality monitoring |
| VS_PLL, VS_CP, VS_VCO, VS_IF, VS_MIXER, VS_REG | Domain-specific supply pins | Isolated voltage domains minimize noise coupling between PLL, VCO, IF, mixer, and regulator sections |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary on-chip voltage regulator | Provides stable 3.0 V output (±0.1 V) from 3.2–4.6 V input - eliminates need for external LDO in handheld designs |
| Integrated closed-loop modulation compensation | 6× oversampling + digital sum variation correction - enables unlimited multislot operation without adjacent-channel interference |
| Dual-VCO architecture with independent control | Separate RX/TX VCO selection (bit D13) and dedicated regulators - prevents TX leakage into RX path and improves spectral purity |
| Image-rejection mixer with 20 dB IRR | On-die quadrature LO generation and differential RF inputs - achieves >20 dB image rejection without external balun or filtering |
| Gaussian filter with scalable deviation (60–130%) | 12-tap digital filter clocked at 13.824 MHz - allows fine-tuning of modulation index to meet regional DECT spectral mask requirements |
| Fast power-state transitions | <10 µs wake-up from zero-supply; <2 µs entry to standby - supports aggressive duty cycling in battery-powered handsets |
Applications
| DECT Cordless Handset Transceiver | DECT Base Station RF Front-End |
|---|---|
Use Scenario: Integrated transceiver in portable DECT handset operating in 1880–1900 MHz band with multi-slot TDMA. IC Role / Device Role / Timing Role: Single-chip RF transceiver handling full RX/TX signal chain including image-rejection mixing, IF amplification, FM demodulation, and closed-loop modulation. Use Value: Reduces BOM count by integrating VCO, PLL, regulators, RSSI, and ramp generator - enables sub-20 mm² RF section with 54 mA TX / 85 mA RX current. | Use Scenario: Base station RF front-end supporting simultaneous multi-handset communication with high linearity and low phase noise. IC Role / Device Role / Timing Role: High-performance transceiver providing 20 dB image rejection, 10 dB NF, and ±5% VCO DAC tuning for production calibration. Use Value: Enables robust co-location of multiple DECT channels via precise LO control and integrated modulation compensation - meets ETSI EN 300 175-2 spectral mask. |
| Low-Power VoIP Gateway Radio Module | Industrial Wireless Sensor Node (DECT Mode) |
Use Scenario: Compact VoIP gateway with embedded DECT radio for PSTN replacement in enterprise environments. IC Role / Device Role / Timing Role: Full DECT transceiver with 3-wire bus control, RSSI-based channel selection, and ramp-controlled PA drive. Use Value: Supports fast channel switching and RSSI-based adaptive scanning using integrated 80 dB dynamic range RSSI - reduces call setup latency. | Use Scenario: Battery-operated sensor node transmitting periodic telemetry over DECT's low-latency, licensed-band infrastructure. IC Role / Device Role / Timing Role: Ultra-low-power transceiver with 10 µA standby current and <2 µs wake-up - optimized for intermittent burst transmission. Use Value: Extends 10-year battery life via independent power domain control (PU_REG/PU_VCO/PU_RX/TX) and zero-supply settling in <10 µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DECT transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STW81101 | Supports 1.9 GHz DECT but lacks integrated ramp generator and closed-loop MCC; requires external VCO tuning DAC | Needs external ramp circuit and discrete modulation compensation - increases PCB area and calibration complexity | Choose when legacy design reuse or cost-sensitive non-multislot applications outweigh integration benefits |
| MAX2420 | Lower integration: no on-chip PLL, VCO, or baseband filter; requires external IF SAW and demodulator | Targets custom narrowband ISM systems, not DECT-compliant timing or modulation - no built-in GF or MCC | Choose only for non-DECT 1.9 GHz applications requiring maximum flexibility in IF architecture |
Compared with STW81101 and MAX2420, the T2801-PLQ delivers full DECT compliance in one chip - integrating closed-loop modulation, ramp control, dual regulators, and 3-wire programmability - reducing design cycle time and component count by >40% in certified handset implementations.
Availability
T2801-PLQ is available at Aetrix Electronics and suitable for DECT cordless telephony, VoIP gateway radios, industrial wireless sensor nodes, and licensed-band IoT edge devices requiring stable component supply across long product lifecycles.
Supply support for T2801-PLQ 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, RF ICs, and secure authentication solutions for embedded systems.
The T2801-PLQ belongs to Atmel's DECT transceiver product line, designed specifically for low-power, fully integrated 1.9 GHz cordless telephony systems meeting ETSI EN 300 175 standards.
FAQ
What reference clock frequencies does the T2801-PLQ support?
The T2801-PLQ supports three standard reference clock inputs: 10.368 MHz, 13.824 MHz, and 20.736 MHz, selected via bits D21–D22 in Data Word 1. These match DECT system timing requirements and determine the phase detector frequency (3.456 MHz). All references must be AC-coupled sine waves with 50–250 mVRMS amplitude applied to REF_CLK (Pin 4).
How does the T2801-PLQ achieve closed-loop modulation without external components?
The T2801-PLQ implements closed-loop modulation using its integrated modulation compensation circuit (MCC), which performs 6× oversampling and digital sum variation correction. This compensates for PLL-induced distortion during TX bursts. Configuration is done via bits E3–E5 (MCCS) and D9 (MCC enable) in the 3-wire serial bus, eliminating need for external loop filters or analog compensation networks.
What is the function of the RAMP_SET pin on the T2801-PLQ?
The RAMP_SET pin (Pin 37) on the T2801-PLQ sets the slew rate of the internal ramp-signal generator. A capacitor connected to this pin determines the rise/fall time of the RAMP_OUT signal (Pin 36), which drives the gate of an external SiGe power amplifier. With a 270 pF capacitor, RAMP_OUT achieves 5 µs rise/fall times - meeting DECT spectral mask requirements for controlled power ramping.
Can the T2801-PLQ operate with unregulated battery supply?
Yes, the T2801-PLQ operates directly from an unregulated 3.0 V to 4.6 V supply. Its on-chip auxiliary voltage regulator (VREG, Pin 8) delivers a stable 3.0 V ±0.1 V output for core logic and analog blocks. This eliminates the need for external LDOs in battery-powered DECT handsets, simplifying power architecture while maintaining performance across battery discharge profiles.
What are the power-down modes supported by the T2801-PLQ?
The T2801-PLQ supports granular power-down via dedicated control pins: PU_REG disables the auxiliary regulator (10 µA standby), PU_VCO powers down only the VCO domain, PU_RX/TX disables RF front-end blocks, and PU_PLL shuts off PLL circuits. Combining these yields <2 µs transition to standby and <10 µs wake-up - critical for DECT's burst-mode operation and battery longevity in portable devices.
T2801-PLQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM > 1GHz
- Protocol:
- -
- Modulation:
- -
- Frequency:
- 1.9GHz
- Data Rate (Max):
- -
- Power - Output:
- 0dBm
- Sensitivity:
- -
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 3V ~ 4.6V
- Current - Receiving:
- 85mA
- Current - Transmitting:
- 54mA ~ 58mA
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (7x7)
T2801-PLQ FAQ
1.How can I place an order for T2801-PLQ through Aetrix?
Please submit a Request for Quotation (RFQ) for T2801-PLQ 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 T2801-PLQ reliable?
The price and inventory of T2801-PLQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T2801-PLQ is usually 5 days.
3.What payment methods are accepted for T2801-PLQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T2801-PLQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T2801-PLQ?
T2801-PLQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T2801-PLQ 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 T2801-PLQ?
For technical support, including T2801-PLQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T2801-PLQ requirements.
6.How does Aetrix verify that T2801-PLQ is sourced from the original manufacturer or authorized distributors?
All T2801-PLQ 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 T2801-PLQ meets industry standards.
7.What is the process for return or replacement of T2801-PLQ?
All T2801-PLQ units undergo pre-shipment inspection (PSI). If there is an issue with T2801-PLQ, 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 T2801-PLQ part is unused and in its original packaging.
Return procedure for T2801-PLQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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