Overview
Description
The 840004 is a 4-output LVCMOS/LVTTL synthesizer optimized to generate Ethernet reference clock frequencies. Using a 26.5625MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL1:0): 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and 53.125MHz. The 840004 uses our third generation low phase noise VCO technology and can achieve 1ps or lower typical random rms phase jitter, easily meeting Ethernet jitter requirements. The 840004 is packaged in a small 20-pin TSSOP package.
Features
- Four LVCMOS/LVTTL outputs, 17Ω typical output impedance
- Selectable crystal oscillator interface or LVCMOS single-ended input
- Supports the following input frequencies: 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
- VCO range: 560MHz - 700MHz
- RMS phase jitter @ 212.5MHz (637kHz - 10MHz):
0.49ps typical, VDDO = 3.3V
Phase noise:
Offset . Noise Power
100Hz ............... -88.8 dBc/Hz
1kHz ................. -109.0 dBc/Hz
10kHz ............... -116.1 dBc/Hz
100kHz ............. -117.5 dBc/Hz - Full 3.3V or mixed 3.3V core/2.5V output supply mode
- 0°C to 70°C ambient operating temperature
- Available in lead-free (RoHS 6) package
Comparison
Applications
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| TSSOP | 20 | C | Yes | Tube | ||
| TSSOP | 20 | C | Yes | Reel |
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