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155/622 Mb/s Clock and Data Recovery IC with Integrated Limiting Amp ADN2807
FEATURES
Meets SONET requirements for jitter transfer/ generation/tolerance Quantizer sensitivity: 4 mV typical Adjustable slice level: ±100 mV Patented clock recovery architecture Loss-of-signal detect range: 3 mV to 15 mV Single-reference clock frequency for all rates, including 15/14 (7%) wrapper rate Choice of 19.44 MHz, 38.88 MHz, 77.76 MHz, or 155.52 MHz REFCLK REFCLK inputs: LVPECL/LVDS/LVCMOS/LVTTL compatible (LVPECL/LVDS only at 155.52 MHz) Optional 19.44 MHz on-chip oscillator to be used with external crystal Loss-of-lock indicator Loopback mode for high speed test data Output squelch and bypass features Single-supply operation: 3.3 V Low power: 540 mW typical 7 mm × 7 mm, 48-lead LFCSP
GENERAL DESCRIPTION
The ADN2807 provides the receiver functions of quantization, signal level detect, and clock and data recovery at rates of OC-3, OC-12, and 15/14 FEC. 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 native rates and 15/14 rate digital wrappers are supported by the ADN2807, 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 ADN2807 is available in a compact 7 mm × 7 mm 48-lead chip-scale package (LFCSP).
APPLICATIONS
SONET OC-3/-12, SDH STM-1/-4 and, 15/14 FEC rates WDM transponders Regenerators/repeaters Test equipment Passive optical networks
FUNCTIONAL BLOCK DIAGRAM
SLICEP/N VCC VEE CF1 CF2 LOL
2 PIN QUANTIZER NIN
ADN2807
LOOP FILTER /n XTAL OSC
2 2
REFSEL[0..1] REFCLKP/N XO1
PHASE SHIFTER
PHASE DET.
LOOP FILTER
VCO
FREQUENCY LOCK DETECTOR
XO2 VREF LEVEL DETECT DATA RETIMING 2 THRADJ SDOUT DATAOUTP/N 2 CLKOUTP/N SEL[0..2] DIVIDER 1/2/4/16 FRACTIONAL DIVIDER 3 REFSEL
03877-0-001
Figure 1. Rev. A
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