hsp50210 Intersil Corporation, hsp50210 Datasheet - Page 19

• Manufacturer Part Number: hsp50210
• Description: Digital Costas Loop
• Manufacturer: Intersil Corporation

FRZ_CT
OFFSET
(1, 2, 4, 8, 16)
PHASE
FREQUENCY
SHIFT
CARRIER PHASE
REG
ERROR DETECT
DELAY
+
-
SHIFT
PHASE ERROR
(
+
+
SHIFT LEFT
E
DISCRIMINATOR
)
0, 1, 2, 3
SHIFT LEFT
0, 1, 2, 3
@
OR
ERROR DETECT
“0”
FREQUENCY
*
CARRIER
“0”
INVERT
ERROR
PHASE
FREQUENCY
FIGURE 15. CARRIER ACQUISITION/TRACKING LOOP BLOCK DIAGRAM
INVERT
ERROR
@
@
OR
OR
!
!
“0”
“0”
LOOP FILTER
ZERO
“0”
AFC LOOP FILTER
CARRIER
AFC
ZERO
ZERO
MANTISSA
LEAD
LAG
MANTISSA
MANTISSA
LEAD
ACQ
ACQ
ACQ
LAG
MUX
MUX
MUX
CARRIER LEAD GAIN
CARRIER LAG GAIN
LAG
MANTISSA
TRACK
MANTISSA
LEAD
MANTISSA
TRACK
TRACK
EXPONENT
EXPONENT
AFC GAIN
LEAD
EXPONENT
ACQ
ACQ
LAG
ACQ
MUX
MUX
MUX
LAG
EXPONENT
TRACK
LEAD
EXPONENT
TRACK
EXPONENT
TRACK
+
LOAD
ACC
FROM
MICROPROCESSOR
INTERFACE
MUX
“0”
TRACK
+
SHIFT
MUX
ACCUMULATOR
SWEEP RATE
MANTISSA
ACQ
UPPER/LOWER
LAG
ACC LIMITS
FREQUENCY SWEEP
ZERO
SWEEP
SWEEP RATE
EXPONENT
+
LEAD/LEAD + LAG
LAG/LEAD + LAG
BLANK = CLK RATE
REGISTER ENABLE RATE
REG
FORMATTER
@
*
OUTPUT
!
SERIAL
= SYMBOL RATE
= SYNC RATE
= TWICE SYMBOL
TO
INTERFACE
P
TO NCO
COF
COFSYNC