ADN2807_15 Datasheet, PDF (1/20 Pages) Analog Devices – 155/622 Mb/s Clock and Data Recovery IC with Integrated Limiting Amp

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.
APPLICATIONS
SONET OC-3/-12, SDH STM-1/-4 and, 15/14 FEC rates
WDM transponders
The ADN2807 is available in a compact 7 mm × 7 mm 48-lead
chip-scale package (LFCSP).
Regenerators/repeaters
Test equipment
Passive optical networks
FUNCTIONAL BLOCK DIAGRAM
SLICEP/N
VCC VEE
CF1
CF2
LOL
2
ADN2807
PIN
QUANTIZER
NIN
PHASE
SHIFTER
PHASE
DET.
LOOP
FILTER
LOOP
FILTER
VCO
FREQUENCY
LOCK
DETECTOR
VREF
LEVEL
DETECT
THRADJ _SDOUT
DATA
RETIMING
2
DATAOUTP/N
DIVIDER
1/2/4/16
2
CLKOUTP/N
FRACTIONAL
DIVIDER
3
SEL[0..2]
2
2
/n
XTAL
OSC
REFSEL[0..1]
REFCLKP/N
XO1
XO2
REFSEL
Figure 1.
Rev. A
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