GC5330IZEV Datasheet, PDF (2/49 Pages) Texas Instruments – Wideband Transmit-Receive Digital Signal Processors

GC5330
GC5337
SLWS226 B – DECEMBER 2010 – REVISED JANUARY 2011
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (Continued)
The CFR block reduces the peak-to-average ratio (PAR) of the digital transmit signals, such as those used in
third-generation (3G) code division multiple access (CDMA) and orthogonal frequency-division multiple-access
(OFDMA) applications.
The DPD path with a 310-MHz DPD clock can be configured to support one antenna at 62 MHz, two antennas at
62 MHz each, or four antennas at 31 MHz each, all with an associated 5× DPD expansion bandwidth. The
GC533x DPD processor reduces power amplifier (PA) nonlinearity, e.g., as measured by adjacent-channel
leakage ratio (ACLR), by over 20 dB. By reducing the PAR of the digital signal and the PA nonlinearity, the
operational efficiency of follow-on power amplifiers can be substantially improved.
A higher DPD bandwidth is possible with reduced DPD performance. Several architectures that provide
performance and cost optimization are listed in Table 1
Figure TX Antenna
Figure 1 2-62 {74} MHz
Figure 2 2-62 {74} MHz
Figure 3 2-62 {74} MHz
Figure 4 2-62 {74} MHz
Figure 5 4-31 {37} MHz
Table 1. Sample Configurations for GC5330 {GC5337}
DPD Bandwidth
310 {370} MHz
310 {370} MHz
310 {370} MHz
310 {370} MHz
155 {185} MHz
ET Support
2-envelope
tracking
Feedback RX Antenna
Other
2 typical at 250
Subsampled real Msps, up to 4 at
250 Msps
Lower-cost 2-antenna
solution
Full-rate real up to
1Gsps
2 at 250Msps, 4
with lower-rate RX
ADC
2-antenna solution with
full-rate real feedback
Subsampled
complex
2 at 250Msps, 4 2-antenna solution with
with lower-rate RX complex feedback, lower
ADC
subsampling ratio
Full-rate real up to
1Gsps
2 at 250Msps, 4
with lower-rate RX
ADC
2-antenna solution, with
envelope tracking with
full-rate real feedback
Subsampled real
4 at 250Msps, 8
with lower-rate RX
ADC
Lower-cost 4 antenna
solution
2
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