Skyworks Solutions Inc. 516CHB000950AAGR

Overview

516CHB000950AAGR from Skyworks Solutions is a dual-frequency voltage-controlled crystal oscillator (VCXO) with factory-programmed output frequencies of 156.25 MHz and 125 MHz, ±20 ppm temperature stability, 3.3 V supply, CMOS output format, and 5×7 mm 6-pin package. It delivers low phase jitter (0.25 ps RMS, 1.875–20 MHz), 1% control voltage linearity, and supports telecom clocking in SONET/SDH systems.

For engineers reviewing the 516CHB000950AAGR datasheet, 516CHB000950AAGR pinout, 516CHB000950AAGR application, or 516CHB000950AAGR equivalent, this device serves as a programmable, high-stability timing source for FPGA clock generation, PON transceivers, and low-jitter PLL reference design where dual selectable frequencies and supply noise rejection are critical.

Technical Context

The 516CHB000950AAGR implements an integrated PLL-based synthesizer using a fixed AT-cut fundamental-mode crystal, enabling two user-selectable frequencies without discrete crystal swaps. Its digital frequency selection (FS pin) toggles between 156.25 MHz and 125 MHz with <10 ms settling time.

It features a 60 ppm/V tuning slope (Kv), 0.1–0.9×VDD control voltage range, and 100 kHz modulation bandwidth. The CMOS output drives 15 pF loads with 0.6–0.9 ns rise/fall times and 48–52% duty cycle, meeting telecom jitter requirements per ITU-T G.823/G.824.

Key Specifications

Pinout & Package

516CHB000950AAGR uses a 6-pin 5×7 mm surface-mount package (JEDEC MO-220, variant VBGA). Pin 1 is marked by a circle on the top side; pins are arranged in a single row with 2.54 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-frequency VCXO applications.

Compared with Si516CHB000213AAG, 516CHB000950AAGR offers identical electrical performance but in a larger 5×7 mm footprint with tape-and-reel delivery-ideal for high-volume SMT lines. Compared with DS3205Z-156.25M, it adds dual-frequency flexibility and tighter control voltage linearity at the cost of higher supply current and larger package.

Availability

516CHB000950AAGR is available at Aetrix Electronics and suitable for SONET/SDH line cards, PON OLT systems, and FPGA-based test equipment requiring stable component supply, short lead times, and guaranteed RoHS-compliant sourcing.

Supply support for 516CHB000950AAGR 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

Skyworks Solutions is a global leader in analog and mixed-signal semiconductors, specializing in RF, timing, and wireless infrastructure solutions with broad manufacturing scale and reliability certification.

The Si516 product line delivers programmable, high-stability VCXOs for telecom, datacom, and broadcast video applications where dual-frequency agility, low jitter, and rapid customization are essential.

FAQ

What are the two factory-programmed output frequencies of the 516CHB000950AAGR?

The 516CHB000950AAGR is configured with nominal output frequencies of 156.25 MHz and 125 MHz. These values are permanently programmed during manufacturing and selected via the FS pin: FS = 0 selects 156.25 MHz, and FS = 1 selects 125 MHz. Both frequencies operate under the same 3.3 V CMOS output configuration and meet ±20 ppm temperature stability over –40 to +85 °C.

Does the 516CHB000950AAGR support differential output formats like LVDS or LVPECL?

No, the 516CHB000950AAGR is specifically configured for single-ended CMOS output, as indicated by the "C" in the 2nd option code of its part number. It does not support LVDS, LVPECL, or HCSL outputs. For differential variants, Skyworks offers other Si516 part numbers such as those with option codes "B" (LVDS) or "A" (LVPECL), but 516CHB000950AAGR remains CMOS-only.

What is the control voltage tuning range and slope for the 516CHB000950AAGR?

The 516CHB000950AAGR has a control voltage (Vc) range of 0.1×VDD to 0.9×VDD (0.33–2.97 V at 3.3 V supply) and a tuning slope (Kv) of 60 ppm/V, as specified by the "B" in the 3rd option code. This slope is factory-trimmed and exhibits ±10% variation across temperature and unit-to-unit, enabling predictable frequency pulling for closed-loop PLL designs.

How does the 516CHB000950AAGR achieve low phase jitter despite using a CMOS output?

The 516CHB000950AAGR achieves 0.25 ps RMS phase jitter (1.875–20 MHz) through its proprietary PLL architecture and optimized CMOS driver design-not output format alone. Key contributors include the high-Q AT-cut crystal resonator, digital calibration of loop filter components, and supply noise rejection circuitry that limits added jitter to ≤3.5 ps even under 500 kHz VDD perturbation.

Is the NC pin (Pin 5) on the 516CHB000950AAGR safe to leave unconnected in the PCB layout?

Yes, Pin 5 is designated NC (No Connect) in both CMOS and differential pinout configurations per Skyworks' official documentation. It has no internal connection and must remain unconnected on the PCB. Routing traces or placing vias or thermal reliefs to this pin may introduce parasitic coupling or EMI; best practice is to omit any copper connection entirely.