GC4114 Datasheet, PDF (5/45 Pages) Texas Instruments – QUAD TRANSMIT CHIP

GC4114 QUAD TRANSMIT CHIP
DATA SHEET REV 1.0
GC4114 DATASHEET
1.0 KEY FEATURES
• Four identical up-convert channels
• Independent modulation frequencies
• Independent phase/gain controls
• The four input signals are summed into a single
output signal
• Maximum output rate of 70 MHz
• 16 bit real or complex inputs
• Interpolation factors of
16 to 32,768 in the real input mode
32 to 65,536 in the complex input mode
• Bit serial input format, or
• Memory mapped input registers
• 8 to 16 bit output samples
• 2’s Complement or offset-binary output format
• 0.02 Hz tuning resolution
• 90 dB Spur Free Dynamic Range
2.0 BLOCK DIAGRAM
• > 90 dB far image rejection
• > 70dB near image rejection
• 0.07 dB gain resolution
• 0.05 dB peak to peak passband ripple
• User programmable 63 tap input filter
• Accepts QPSK or QAM symbol data directly,
performs transmit (pulse shape) filtering
• Meets Damps and GSM specifications
• Sum I/O path to merge outputs from multiple
GC4114 chips
• Microprocessor interface for control, input,
and diagnostics
• Built in diagnostics
• Microprocessor and serial inputs will accept
either 3.3 or 5 volt input levels.
• 800 mW at 33 MHz, 3.3 volts
• 100 pin thin QFP package
A block diagram illustrating the major functions of the chip is shown in Figure 1.
FORMAT
SELECT
GAIN
AIN
(BIT SERIAL)
16 BITS
FILTER
SELECT
BANDWIDTH
TUNING
FREQUENCY
PHASE
OFFSET
SINE/
COSINE
GENERATOR
GAIN
B_IN
(BIT SERIAL)
TUNING
FREQUENCY
PHASE
OFFSET
SINE/
COSINE
GENERATOR
FORMAT
SELECT
GAIN
CIN
(BIT SERIAL)
FILTER
SELECT
BANDWIDTH
GAIN
D_IN
(BIT SERIAL)
TUNING
FREQUENCY
PHASE
OFFSET
SINE/
COSINE
GENERATOR
TUNING
FREQUENCY
PHASE
OFFSET
SINE/
COSINE
GENERATOR
CK
CLOCK DOUBLING
AND
DISTRIBUTION CIRCUIT
CONTROL INTERFACE
SI
AND FILTER COEFFICIENT RAMS
SYNC COUNTER
AND
DIAGNOSTIC TEST
GENERATOR
CE WR RD A[0:5] C[0:7]
Figure 1. GC4114 Block Diagram
SUM IN
SUM CLR
SUM OUT
(8 to 16 BITS)
SO
Texas Instruments Inc.
-1-
MAY 22, 2000
This document contains information which may be changed at any time without notice