GC3021A Datasheet, PDF (3/38 Pages) Texas Instruments – 3.3V MIXER AND CARRIER REMOVAL CHIP

GC3021A 3.3V MIXER AND CARRIER REMOVAL CHIP
SLWS137A
GC3021A DATASHEET
1.0 KEY FEATURES
CARRIER REMOVAL MODE
• 100 Million Complex Samples per second (CSPS)
input data
• 12 bit input and output data
• 12 bit by 12 bit complex multiplier
• 4K bit phase error lookup RAM
• Phase error feedback loop for carrier and
phase offset removal
• 32 bit numerically controlled oscillator (NCO)
• Snapshot memory for adaptive filtering
MIXER MODE
• 200 MSPS real input data
(even/odd data at 100MSPS)
• 100 MSPS complex input data
(TTL level inputs)
• 12 bit inputs and outputs
• 32 bit NCO phase control
• NCO generates 12 bit sines and cosines
OVERALL
• Microprocessor interface for control,
output, and diagnostics
• Built in diagnostics
• 500 mW power at 100 MHz, 3.3 volts
• 160 pin plastic quad flat pack package
1.1 BLOCK DIAGRAM
A block diagram illustrating the major functions of the chip is shown in Figure 1
CS
RE, WE
A[0:8]
C[0:15]
9 Bits
16 Bits
CONTROL
INTERFACE
Internal Controls
I[0:11]
DATA IN
Q[0:11]
12 Bits
12 Bits
INPUT
FORMAT
12 Bits
12 Bits
MIXER
AND
DC REMOVAL
Complex data at 100 MHz _HSO
Real data at 200 MHz
12 Bits
OUTPUT
FORMAT
12 Bits
12 Bits
12 Bits
Odd/Even Complex Pairs,
Complex Samples,
or I/Q Symbols
DATA OUT
(70 MHz)
YA[0:11]
YB[0:11]
YC[0:11]
YD[0:11]
SA
SB
CK
CKENA
CKENB
SYNC
COUNTER
CLOCK
GENERATOR
SO
Internal
Syncs
Internal
Clocks
12 Bits
12 Bits
PHASE ERROR
LOOKUP RAM 1 Bit
4K BY 1 Memory
EOUT
EIN ^{1 Bit}
CIN ^{1 Bit}
PHASE
LOCK
LOOP
CIRCUIT
32 Bits
NCO
CIRCUIT
Carry In
12 Bits
12 Bits
12 Bits
12 Bits
SN
SNAPSHOT
RAM
Quad 64 Word
Memory
sync
Figure 1. GC3021A BLOCK DIAGRAM
Texas Instruments Incorporated
-1-
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