The ADN2811 provides the receiver functions of quantization, signal level detect, and clock and data recovery at OC-48 and OC-48 FEC rates. All SONET jitter requirements are met, including jitter transfer, jitter generation, and jitter tolerance. All specifications are quoted for −40°C to +85°C ambient temperature, unless otherwise noted.
The device is intended for WDM system applications and can be used with either an external reference clock or an on-chip oscillator with external crystal. Both the 2.48 Gbps and 2.66 Gbps digital wrapper rates are supported by the ADN2811, without any change of reference clock.
This device, together with a PIN diode and a TIA preamplifier, can implement a highly integrated, low cost, low power, fiber optic receiver.
The receiver front end signal detect circuit indicates when the input signal level has fallen below a user-adjustable threshold. The signal detect circuit has hysteresis to prevent chatter at the output.
The ADN2811 is available in a compact, 7 mm × 7 mm, 48-lead chip scale package.
Applications
SONET OC-48, SDH STM-16, and 15/14 FEC
WDM transponders
Regenerators/repeaters
Test equipment
Backplane applications
### Features and Benefits
Meets SONET requirements for jitter transfer/generation/tolerance
Quantizer sensitivity: 4 mV typical
Adjustable slice level: ±100 mV
1.9 GHz minimum bandwidth
Patented clock recovery architecture
Loss of signal detect range: 3 mV to 15 mV
Single reference clock frequency for both native SONET and 15/14 (7%) wrapper rate
Choice of 19.44 MHz, 38.88 MHz, 77.76 MHz, or 155.52 MHz REFCLK
LVPECL/LVDS/LVCMOS/LVTTL compatible inputs (LVPECL/LVDS only at 155.52 MHz)
19.44 MHz on-chip oscillator to be used with external crystal
