4-channel, 16-bit, 1.25 gsps dac · pulse oximetry ultrasound systems applications ... wireless...
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4-Channel, 16-Bit, 1.25 GSPS DAC Slashes power consumption, increases speed
Philip Pratt
Product Marketing Engineer, High Speed Data Converters
High Performance Analog
Applications• Sensors• Motor Control• Test Equipment• Programmable Logic
Controllers• Energy
TI data converter markets and applications
Applications Optical Networking Base Stations Wireless Handsets Cable Modem WiMax
Applications Portable Media
Players Digital Video
Recorders Media Gateways Digital Cameras Smartphones / PDAs
Applications Electrocardiogram
(ECG) CT Scanners Infusion Pumps Pulse Oximetry Ultrasound Systems
Applications Radar Software Defined
Radio Signals Intelligence Satellite
Communications Data Links
MultimediaIndustrial MedicalCommunicationSpace &Defense
Market Drivers • Low Noise• High Accuracy /
Resolution• Low Offset• Low Drift• Power• Packaging
Market Drivers • Speed• Resolution• Bandwidth• Gain• Power• Integration
Market Drivers• Power• Size• Integration• Cost
Market Drivers • Resolution• Sampling Rate• Power• Size• Integration• Cost
Market Drivers • Speed• Resolution• Bandwidth• IF Performance• Power• Integration
Wireless infrastructure market growth continues
• LTE network equipment, including E-
UTRAN (eNodeB) macrocells and
Evolved Packet Core (EPC) equipment,
jumped 704% in 2010 over 2009
• 4G infrastructure market forecast to hit
$16 billion by 2015, driven by LTE and
WiMAX investments
• Mobile broadband service revenue
expected to grow faster than voice and
SMS/MMS, with a 25% 5-year compound
annual growth rate from 2009 to 2014
• Mobile broadband subscribers projected
to reach 1.8 billion worldwide in 2014
(28% of subscribers), driven by
smartphone adoption
Source: Infonetics
Interpolating DACs
Sample Rate (MSPS)
400 800 1000
16
Reso
lution (
Bits)
500-625 1250
DAC5674Single, PLL
4x Interpolation
14
DAC5687Dual, QMC, PLL,
NCO, 8x Interpolation
DAC5686Dual, PLL, NCO
16x Interpolation
DAC3282Dual,
2x Interpolation
DAC3283Dual, QMC
4x Interpolation
DAC5689Dual, QMC,
NCO, 8x Interpolation
DAC5688Dual, QMC, PLL
NCO, 8x Interpolation
DAC5682ZDual, QMC, PLL
NCO, 4x Interpolation
DAC5681ZSingle, QMC, PLL
4x Interpolation
12
DAC3484Quad, 16x Interpolation
312M Input Rate
DAC3482Dual, 16x Interpolation
625M Input Rate
DAC34H84Quad, 16x Interpolation
625M Input Rate
1+GSPS quad DAC comparisonTI DAC slashes power while boosting speed
~ For base stations, wideband repeaters, software defined radios ~
More features and benefits
Feature Benefit
9-mm x 9-mm Multi-row QFN
(DAC3484, DAC3482)
44% smaller than closest competitor
16-bit interleaved 1.25-GSPS input Reduces pin count, layout complexity
and board size
Group delay calibration Improves sideband suppression for
wideband signals
Multi-DAC synchronization Reduces design complexity for
diversity and smart antenna radios
2x-16x interpolation Lowers interface rate, cost of
FPGA/DUC
Two 32-bit NCOs (DAC3484,
DAC34H84)
Independent, fine-tuned, wide-range
output frequency
First TI product with Multi-row QFN
Benefits:
• Great thermal capability
• Higher I/O density
• Customized footprint
88 pins, 9-mm x 9-mm package
DAC3484
DAC3482
DAC3484 diagram
HPA
GC5330
DUC/DDC
CFR/DPD
SDRAM
Main
Diversity
Main
Diversity
IQ DeModulatorTRF3711
Digital Pre-Distortion (DPD)
Feedback Path
IQ Modulator
TRF370315
IQ DeModulatorTRF3711
Two Transmit PathsTwo Receive Paths
Antenna
AntennaAntenna
Antenna
DAC3484
DAC
DAC
DAC
DAC
ADS6422
ADC
ADC
ADC
ADC
CDCE72010CLOCK
IQ Modulator
TRF372017
C6748DSP
ADS41B29
ADC
THS7700
HPA
3G/LTE multimode base station Two transmit, two receive radio with pre-distortion
Unwanted sideband at 200 MHz wideband unadjusted
Ref -20 dBm Att 5 dB
1 AP
CLRWR
A
80 MHz/Center 1.8 GHz Span 800 MHz
3DB
RBW 3 MHz
VBW 10 MHz
SWT 2.5 ms
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
Date: 30.NOV.2010 11:58:20
DAC3484 settings:
• 307.2 MSPS input rate
• 4x interpoloation
• 200 MHz NCO
• DAC sampling rate:
1228.8 MHz
TRF370315 settings:
• Local oscillator 1.8 GHz
Center 1.8 GHz Spacing, 80 MHz Per Division, Span 800 MHz
Wanted Signal
Unwanted Sideband
Enabling gain and phase correction reduces unwanted sideband; does not eliminate it
Ref -20 dBm Att 5 dB
1 AP
CLRWR
A
80 MHz/Center 1.8 GHz Span 800 MHz
*
3DB
RBW 50 kHz
VBW 200 kHz
SWT 320 ms
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
Date: 30.NOV.2010 12:09:18
Unwanted Sideband
Reduced
Center 1.8 GHz Spacing, 80 MHz Per Division, Span 800 MHz
Wanted Signal
Ref -20 dBm Att 5 dB
1 AP
CLRWR
A
80 MHz/Center 1.8 GHz Span 800 MHz
*
3DB
RBW 50 kHz
VBW 200 kHz
SWT 320 ms
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
Date: 30.NOV.2010 12:06:39
Enabling gain, phase AND group delay correction suppresses unwanted sideband
Unwanted Sideband
Suppressed
Wanted Signal
Center 1.8 GHz Spacing, 80 MHz Per Division, Span 800 MHz
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Summary
• Industry’s most power-efficient 4-channel,
16-bit DAC
• At 1.25 GSPS, the DAC3484 is 25% faster
than the next fastest 4-channel DAC
• Consumes only 250 mW per channel in
16x interpolation mode – 65% less than the
closest competitor
• 40% smaller than alternative quad DAC
solutions while supporting data rates up
312.5 MSPS per DAC
• For data rates up to 625 MSPS:
– 2-channel DAC3482
– 4-channel DAC34H84
More information
• DAC3484 overview: www.ti.com/dac3484-pr
• DAC3484 data sheet: www.ti.com/dac3484ds-pr
• New TI signal chain guide: www.ti.com/signalchain-pr
• High Speed Data Converter forum on E2E Community:
www.ti.com/e2ehsdc-pr
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