GC3021A 3.3V MIXER AND CARRIER REMOVAL CHIP
SLWS137A
GC3021A DATASHEET
1.0
KEY FEATURES
CARRIER REMOVAL MODE
MIXER MODE
•
100 Million Complex Samples per second (CSPS)
input data
•
•
200 MSPS real input data
(even/odd data at 100MSPS)
•
•
•
•
12 bit input and output data
100 MSPS complex input data
(TTL level inputs)
12 bit by 12 bit complex multiplier
4K bit phase error lookup RAM
•
•
•
12 bit inputs and outputs
32 bit NCO phase control
Phase error feedback loop for carrier and
phase offset removal
NCO generates 12 bit sines and cosines
•
•
32 bit numerically controlled oscillator (NCO)
Snapshot memory for adaptive filtering
OVERALL
•
•
500 mW power at 100 MHz, 3.3 volts
160 pin plastic quad flat pack package
•
Microprocessor interface for control,
output, and diagnostics
•
Built in diagnostics
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]
Internal Controls
CONTROL
INTERFACE
9 Bits
16 Bits
DATA OUT
(70 MHz)
12 Bits
12 Bits
12 Bits
12 Bits
12 Bits
12 Bits
YA[0:11]
YB[0:11]
YC[0:11]
12 Bits
I[0:11]
MIXER
AND
DC REMOVAL
INPUT
OUTPUT
FORMAT
DATA IN
FORMAT
12 Bits
HSO
Q[0:11]
YD[0:11]
Odd/Even Complex Pairs,
Complex Samples,
or I/Q Symbols
Complex data at 100 MHz
Real data at 200 MHz
SO
SA
SB
SYNC
COUNTER
Internal
Syncs
12 Bits
12 Bits
PHASE ERROR
LOOKUP RAM
CK
CLOCK
GENERATOR
Internal
Clocks
1 Bit
CKENA
CKENB
EOUT
4K BY 1 Memory
12 Bits
SNAPSHOT
RAM
PHASE
LOCK
NCO
12 Bits
12 Bits
32 Bits
CIRCUIT
1 Bit
LOOP
EIN
CIN
Quad 64 Word
Memory
CIRCUIT
12 Bits
sync
Carry In
1 Bit
SN
Figure 1. GC3021A BLOCK DIAGRAM
Texas Instruments Incorporated - 1 -
This document contains information which may be changed at any time without notice
TI [ TEXAS INSTRUMENTS ]
