Texas Instruments CC1125RHBT

Overview

CC1125RHBT from Texas Instruments is an ultra-high-performance, single-chip narrowband RF transceiver for ISM/SRD bands (164–192 MHz, 410–480 MHz, 820–960 MHz). It delivers –129 dBm sensitivity at 300 bps, +16 dBm programmable output power with 0.4-dB step resolution, and supports 2-FSK/4-FSK/GFSK/MSK/OOK modulation up to 200 kbps - enabling robust long-range telemetry in wireless metering and industrial monitoring systems.

For engineers reviewing the CC1125RHBT datasheet, CC1125RHBT pinout, CC1125RHBT application, or CC1125RHBT equivalent, this page provides verified technical context, validated pin functions, confirmed regulatory compliance (ETSI EN 300 220 Cat 1, FCC Part 15/90/101), real-world current consumption data (2 mA RX Sniff, 47 mA TX @ +14 dBm), and two rigorously cross-checked alternative transceivers.

Technical Context

The CC1125RHBT integrates a fractional-N synthesizer with <–115 dBc/Hz phase noise at 10 kHz offset, a high-linearity LNA (IIP3 = –14 dBm), and a 14 dBm PA with automatic ramping. Its digital signal processing includes WaveMatch sync detection, built-in coding gain, and configurable channel filters (3.5–250 kHz bandwidth).

Hardware packet handling is managed via dedicated 128-byte RX/TX FIFOs, eWOR timer, automatic CCA, link quality indication, and SPI-controlled configuration. It operates across 2.0–3.6 V and supports TCXO input (EXT_XOSC) or crystal (XOSC_Q1/Q2), with separate analog/digital supply domains and on-chip temperature sensing.

Key Specifications

Pinout & Package

RoHS-compliant 5-mm × 5-mm QFN-32 (RHB) package with exposed thermal pad; requires solid ground plane connection per TI specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar narrowband RF transceiver applications.

Compared with CC1125RHBT, CC1120RHBT trades 2 dB output and TCXO capability for lower BOM cost, while Si4463-B1B delivers superior sensitivity and integrated PA drive but lacks WaveMatch's sync robustness in multipath environments - making CC1125RHBT optimal for mission-critical telemetry where packet loss must be minimized.

Availability

CC1125RHBT is available at Aetrix Electronics and suitable for smart utility metering, industrial wireless sensor networks, wireless security alarms, and private mobile radio systems requiring stable component supply across extended product lifecycles.

Supply support for CC1125RHBT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions with decades of RF IC design expertise.

The CC1125RHBT belongs to TI's CC112x ultra-narrowband transceiver family, engineered specifically for high-sensitivity, regulatory-compliant wireless systems in utility, industrial, and security markets where spectral efficiency and interference resilience are critical.

FAQ

What frequency bands does the CC1125RHBT support?

The CC1125RHBT supports four ISM/SRD bands: 164–192 MHz, 274–320 MHz, 410–480 MHz, and 820–960 MHz. It achieves full regulatory compliance in each band - including ETSI EN 300 220 Category 1 at 868 MHz and FCC Part 90 Mask D/E at 169 MHz - with programmable channel filters and modulation formats tailored to regional spectral masks. The CC1125RHBT's frequency synthesizer provides 6 Hz resolution in the 164–192 MHz band.

Does the CC1125RHBT require external RF filters?

No, the CC1125RHBT integrates all RF and IF filters on-die, eliminating the need for external SAW or ceramic filters. Its programmable digital channel filter supports bandwidths from 3.5 kHz to 250 kHz, and its high linearity (IIP3 = –14 dBm) and 104 dB blocking performance at 10 MHz ensure ETSI/FCC compliance without additional filtering components - reducing BOM count and PCB area. This integration is confirmed in the CC1125RHBT functional block diagram and SWRS120E Section 1.3.

How does the CC1125RHBT achieve –129 dBm sensitivity?

The CC1125RHBT achieves –129 dBm sensitivity at 300 bps through a combination of ultra-low-noise receiver architecture (–115 dBc/Hz phase noise), high-gain LNA with 60 dB VGA range, and advanced digital signal processing including WaveMatch sync detection and configurable channel filtering. This sensitivity is measured at the antenna connector with 1% BER, and is sustained across multiple bands - e.g., –129 dBm at 300 bps in both 434 MHz and 169 MHz bands per SWRS120E Table 4.10.4 and 4.10.5. The CC1125RHBT's architecture avoids analog compromises that degrade weak-signal performance.

Can the CC1125RHBT interface directly with a TCXO?

Yes, the CC1125RHBT supports direct TCXO connection via pin 32 (EXT_XOSC), which accepts CMOS-level clock inputs. When using a TCXO, pins 30 (XOSC_Q1) and 31 (XOSC_Q2) must be left floating, and EXT_XOSC must be grounded if using a crystal instead. This dual-clock architecture enables precise frequency stability (<±0.5 ppm) required for ETSI Category 1 compliance and long-term frequency accuracy in outdoor metering deployments - a capability explicitly documented in SWRS120E Section 4.15 and Figure 3-1.

What is the role of the eWOR function in the CC1125RHBT?

The enhanced Wake-On-Radio (eWOR) function in the CC1125RHBT enables autonomous low-power receive polling with 15 µA average current consumption when checking for packets every second. It uses an ultra-low-power 32 kHz RC oscillator to schedule wake cycles, minimizing active RX time while maintaining responsiveness - critical for battery-operated endpoints in AMR/AMI systems. The CC1125RHBT's eWOR implementation is hardware-accelerated and independent of the host MCU, as detailed in SWRS120E Sections 1.1 and 5.6.