CDC3RL02BYFPR - 52MHz 1:2 Low Phase-Noise Clock Buffer | TI
料号： CDC3RL02BYFPR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.75 | $1.75 |
| 10 | $1.58 | $15.80 |
| 100 | $1.4 | $140.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.95 | $950.00 |
| 3,000 | $0.87 | $2,610.00 |
CDC3RL02BYFPR 概述
A clock fan-out buffer is a clock-distribution integrated circuit that takes one reference clock signal and replicates it across multiple outputs while preserving timing integrity. These buffers sit between a master oscillator (commonly a temperature-compensated crystal oscillator, TCXO) and downstream peripherals, providing isolation, drive strength, and low additive jitter. Within the broader clock-and-timing hierarchy, fan-out buffers belong under clock distribution ICs, which are a subset of clock and timing products and an essential category of timing components.
The CDC3RL02's headline features include two independent clock request inputs (REQ1/REQ2), integrated 1.8V LDO regulators that derive output supply from a higher-voltage battery input, ultra-low additive phase noise suitable for GSM/3G/4G modem baseband timing, and a wide input clock amplitude range accepting both square and sine-wave inputs. Two clock request inputs allow independent enable control of each output channel, which simplifies multi-rail power management.
The device's architecture combines input hysteresis comparators with low-dropout output drivers. According to TI documentation, the internal LDO regulates each output stage to 1.8V from a battery input up to ~3.6V, eliminating the need for an external low-voltage rail. Output skew between the two channels is characterized tightly to maintain deterministic propagation through downstream digital blocks.
Typical applications include mobile-phone modem baseband clock distribution, GPS receiver LO buffering, Bluetooth/Wi-Fi reference clock fan-out, portable audio DAC reference distribution, and wearable-device sensor hub timing. Sine-wave clock acceptance is particularly valuable when interfacing with a TCXO or surface-acoustic-wave (SAW) oscillator that lacks a digital output buffer.
When designing with the CDC3RL02BYFPR, verify that the input clock amplitude meets the datasheet's minimum requirement (sine-wave levels are lower than square-wave levels). Place the device close to the TCXO output to minimize trace capacitance, and keep the output traces matched in length if both outputs drive timing-sensitive loads.
This page synthesizes real-time distributor pricing, pin-compatible drop-in alternatives, and PCB-layout design notes that are not consolidated in the manufacturer datasheet.
直接替换替代料： CDC3RL02BYFPR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
CDC3RL02YFPR
✅ 直接替换📋 参考替代料（不在目录中）
CDC3RL02BYFPR.A
✅ 直接替换📋 参考替代料（不在目录中）
CDC3RL02BYFPR.B
✅ 直接替换📋 参考替代料（不在目录中）
NB3RL02FCT2G
✅ 直接替换📋 参考替代料（不在目录中）
CDC3RL02BYFPR 规格参数
| 功能 | Clock Fanout Buffer (Distribution) |
| 输出数量 | 2 |
| Input-to-Output Ratio | 1:2 |
| Maximum Input Frequency | 52 MHz |
| Input Signal Type | Square or sine wave |
| Clock Request Inputs | 2 (REQ1, REQ2) |
| Internal LDO Output | 1.8 V |
| Additive Phase Noise | Low (per TI datasheet curves) |
| 封装 | 8-XFBGA, DSBGA (YFP) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (260C, unlimited floor life per PartGenie) |
| RoHS 状态 | Compliant |
CDC3RL02BYFPR 引脚配置
| 引脚 A1 | OUT1 — Clock output channel 1 (1.8V LDO powered) |
| 引脚 A2 | GND — Ground |
| 引脚 B1 | OUT2 — Clock output channel 2 (1.8V LDO powered) |
| 引脚 B2 | REQ2 — Clock request input for OUT2 (active-high enable) |
| 引脚 C1 | VIN — Battery input supply (to internal LDO) |
| 引脚 C2 | REQ1 — Clock request input for OUT1 (active-high enable) |
| 引脚 D1 | IN — Clock input (square or sine wave) |
| 引脚 D2 | NC — Not connected (per datasheet ball map) |
典型应用
CDC3RL02BYFPR 适用于 6 应用s: Mobile Phone Modem Clock Distribution, GPS Receiver LO Buffering, Wearable Device Sensor Hub Timing, Portable Audio Reference Distribution, Industrial Handheld Terminal Clock Tree, IoT Sensor Node Reference Clock.
Mobile Phone Modem Clock Distribution
The CDC3RL02BYFPR's 52 MHz bandwidth and low additive phase noise make it ideal for distributing a TCXO reference to a mobile-phone modem baseband and RF transceiver. Per the TI datasheet, the device accepts either a square digital clock or a low-amplitude sine-wave TCXO output directly, eliminating an external Schmitt trigger. Two clock-request inputs let the baseband processor independently gate the modem clock and a GPS LO clock, saving power when subsystems are idle. The internal 1.8 V LDO removes the need for a separate low-voltage regulator, which is critical in space-constrained phone designs where every component competes for mm² of PCB area.
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GPS Receiver LO Buffering
Portable GPS receivers require a low-jitter reference clock at the LO input of the downconversion mixer; phase noise on this reference directly degrades position accuracy. The CDC3RL02BYFPR's ultra-low additive phase noise and sine-wave input compatibility let it buffer a TCXO reference to the GPS IC and a Bluetooth/Wi-Fi companion IC from a single oscillator source. Per TI, the internal 1.8 V LDO powers both output channels from the battery rail, which simplifies the power tree and reduces standby current. Independent REQ1/REQ2 inputs allow the host to disable the GPS LO when navigation is inactive, which is essential for wearables where battery life dominates the BOM trade-off.
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Wearable Device Sensor Hub Timing
Wearable sensor hubs aggregate data from accelerometers, gyroscopes, and optical heart-rate sensors, each of which may require a reference clock. The CDC3RL02BYFPR's two-output fan-out lets a single low-power TCXO drive two sensor subsystems simultaneously, reducing BOM cost and PCB footprint. Per the TI CDC3RL02 datasheet, the chip-scale 8-XFBGA/DSBGA package measures under 2 mm², fitting easily inside a smartwatch or fitness-band chassis. Sine-wave input support means the designer can use a low-power MEMS oscillator instead of a more expensive digital TCXO, which is especially valuable for cost-sensitive wearable designs targeting sub-$50 retail price points.
推荐
Portable Audio Reference Distribution
Portable audio DACs and codecs are sensitive to clock jitter, which directly degrades dynamic range and THD+N. The CDC3RL02BYFPR can buffer a master reference oscillator and fan it out to a stereo audio DAC and a Bluetooth audio IC simultaneously. Per TI's documentation, low additive phase noise preserves the audio bit-perfect timing required for hi-fi playback. The internal 1.8 V LDO allows the part to operate directly from a single-cell Li-ion battery (3.0-4.2 V), simplifying the power tree of battery-powered headphone designs. Independent clock-request inputs let the host disable the Bluetooth IC's clock during wired audio playback, reducing overall power consumption.
推荐
Industrial Handheld Terminal Clock Tree
Industrial handheld terminals (barcode scanners, RFID readers, portable data terminals) require reliable clock distribution to a display controller, scanner engine MCU, and wireless modem. The CDC3RL02BYFPR's 1:2 fan-out topology provides exactly two output channels - sufficient for a scanner MCU plus a wireless modem from a shared TCXO. Per the TI datasheet, the device's industrial temperature tolerance makes it suitable for factory-floor deployments. Two clock-request inputs enable power-gating of the wireless modem during barcode-scan-only operation, extending battery runtime in shift-long use cases where charging infrastructure is not always available.
推荐
IoT Sensor Node Reference Clock
IoT sensor nodes (smart-home, smart-agriculture, asset-tracking) often need a single low-power oscillator feeding multiple sub-systems to minimize quiescent current. The CDC3RL02BYFPR can buffer a 32.768 kHz or TCXO reference to a sensor MCU and a sub-GHz radio, per the TI datasheet. Sine-wave input support allows the use of low-power MEMS oscillators that typically output sine rather than square waves, which is critical for battery-powered nodes that spend 99% of their time in sleep mode. Independent clock-request gating via REQ1/REQ2 lets the node shut down the radio clock during sleep while keeping the RTC running, achieving nanoamp-level standby current with sub-second wake latency.
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推荐产品汇总
工程参考数据： CDC3RL02BYFPR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CDC3RL02YFPR | CDC3RL02BYFPR.A | CDC3RL02BYFPR.B | NB3RL02FCT2G |
|---|---|---|---|---|---|
| Package | 8-XFBGA, DSBGA (YFP) | 8-XFBGA, DSBGA (YFP) - same | 8-XFBGA, DSBGA (YFP) - same | 8-XFBGA, DSBGA (YFP) - same | 8-XFBGA, DSBGA - same ball grid per Utmel comparison |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Output Channels | 2 | 2 | 2 | 2 | 2 |
| Input Signal Type | Square or sine wave | Square or sine wave | Square or sine wave | Square or sine wave | Square or sine wave (per Utmel) |
| Clock Request Inputs | 2 (REQ1, REQ2) | 2 (REQ1, REQ2) | 2 (REQ1, REQ2) | 2 (REQ1, REQ2) | 2 |
| Lifecycle Status | Active | Active | Active | Active | Active (per Utmel) |
关键差异点
- Integrated 1.8V LDO removes external regulator requirement （对比 Generic 1:2 clock buffer without internal LDO)
- Dual clock-request inputs for independent channel gating （对比 Single-output clock buffers)
- Sine-wave TCXO input acceptance （对比 Digital-only clock buffers requiring square-wave inputs)
设计说明
Place the CDC3RL02BYFPR within 5 mm of the TCXO output pin to minimize trace capacitance that can attenuate low-amplitude sine-wave inputs. Keep OUT1 and OUT2 trace lengths matched within 2-3 mm if both outputs feed timing-sensitive loads, since skew between the two channels directly affects downstream digital timing budgets. Use a continuous ground plane directly beneath the DSBGA package to provide a low-impedance return path for the high-frequency clock edges; the chip-scale package has no leads, so the ground balls must connect to the inner ground plane through short vias.
The internal 1.8 V LDO draws its input current from the VIN ball, which must be decoupled with a 1 uF X7R ceramic capacitor placed as close as possible to the VIN-to-GND balls. The LDO does not require an external feedback capacitor, but adding a 100 nF bypass cap on each OUT1/OUT2 ball reduces switching noise coupling into the output clock edge. If the battery rail feeding VIN is shared with a noisy switching converter (e.g., a buck regulator for the PA), add a ferrite bead or pi-filter to isolate the CDC3RL02BYFPR VIN supply from the switching noise, since the LDO's PSRR at frequencies above 1 MHz is limited.
When driving the IN ball with a sine-wave TCXO, ensure the peak-to-peak amplitude meets the datasheet's minimum specification (typically 200-300 mVpp depending on revision). Sine-wave inputs below this threshold can cause the input comparator to chatter, producing sub-harmonic spurs on OUT1/OUT2 that show up as phase noise in the load. For square-wave inputs from a digital oscillator, place a small series resistor (10-33 ohm) at the IN ball to dampen reflections from the input pin capacitance; this reduces ringing on the clock edge and improves additive jitter performance.
Do not leave REQ1 or REQ2 floating - both must be tied high (enabled) or low (disabled) with a defined logic level. Floating REQ inputs can cause indeterminate output states, leading to intermittent clock failure at the downstream IC. Also avoid placing the CDC3RL02BYFPR near sources of high dV/dt switching such as DC-DC converters or LED backlight drivers, since capacitive coupling can inject noise into the sensitive input comparator. Estimated: for a 50 MHz clock, even 1 pF of coupling capacitance at 1 V/ns dV/dt can inject ~1 mA of displacement current - enough to perturb the clock edge by tens of picoseconds.
合规信息
RoHS compliance confirmed per PartGenie listing. REACH and halogen-free status not explicitly stated in verified web data - set to 'unknown'. AEC-Q100 not applicable as this is a consumer/portable clock buffer, not an automotive-grade part.
