特性
- Two LVCMOS/LVTTL outputs
- Selectable crystal oscillator interface or LVCMOS/LVTTL TEST_CLK
- Output frequency range: 103.3MHz to 260MHz
- Crystal input frequency range: 14MHz to 40MHz
- VCO range: 620MHz to 780MHz
- Parallel or serial interface for programming counter and output dividers
- RMS period jitter: 14.7ps (typical), (N ÷ 4, VDDO = 3.3V±5%)
- RMS phase jitter at 155.52MHz, using a 38.88MHz crystal (12kHz to 20MHz): 2.61ps (typical)
Offset Noise Power
100Hz.................-87.9 dBc/Hz
1kHz...................-115.8 dBc/Hz
10kHz.................-124.2 dBc/Hz
100kHz...............-127.7 dBc/Hz - Full 3.3V or mixed 3.3V core/2.5V or 1.8V output supply voltage
- 0°C to 70°C ambient operating temperature
- Industrial temperature information available upon request
- Available in lead-free (RoHS 6) package
84021 - Block Diagram
描述
The 84021 is a general purpose, Crystal-to-LVCMOS/LVTTL High Frequency Synthesizer. The 84021 has a selectable TEST_CLK or crystal input. The VCO operates at a frequency range of 620MHz to 780MHz. The VCO frequency is programmed in steps equal to the value of the input reference or crystal frequency. The VCO and output frequency can be programmed using the serial or parallel interface to the configuration logic.
