Information

58 | Signal Chain Guide 2013 Texas Instruments
100
100
Pattern Test Pattern Test
De-interleave
16
16
16
100 100
Control Interface
Temp
Sensor
DCD15P
DCD15N
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
DCD0P
DCD0N
ISTR/PARITYABP
PARITYCDP
CD-Data Bus
AB-Data Bus
ISTR/PARITYABN
PARITYCDN
OSTRP
OSTRN
SDO
SDIO
SDENB
SCLK
TXENB
RESETB
AVDD
GND
LVDS
LVPECL
LVDS
LVDS
LVDS
8 Sample FIFO
16
ALARM
SLEEP
100
SYNCP
SYNCN
LVDS
100 100
DAB0P
DAB15P
DAB0N
DAB15N
LVDS
LVDS
Programmable Delay
TESTMODE
IOVDD
IOVDD2
Complex Mixer
(FMIX or CMIX)
AB-QMC
Gain and Phase
16-b
DACB
16-b
DACA
IOUTA1
IOUTA2
IOUTB1
IOUTB2
QMC
B-offset
QMC
A-offset
x2 x2 x2 x2
x2 x2 x2 x2
FIR1FIR0
x
sin(x)
x
sin(x)
DAC
Gain
FIR3FIR2
AB-Channel
FIR4
2x–16x Interpolation
AB
32-Bit NCO
cos sin
CMIX Control
(±n*Fs/8)
spat 9spat 11spat 11spat 32spat 95
Clock Distribution
EXTIO
BIASJ
DACCLKP
DACCLKN
DATACLKP
DATACLKN
CLKVDD DIGVDD
VFUSE DACVDD
LVPECL
100
LVDS
Programmable
Delay
Low Jitter
PLL
LPF
PLLAVDD
1.2-V
Reference
CD
32-Bit NCO
cos sin
Complex Mixer
(FMIX or CMIX)
CD-QMC
Gain and Phase
16-b
DACD
16-b
DACC
IOUTC1
IOUTC2
IOUTD1
IOUTD2
QMC
D-offset
QMC
C-offset
x2 x2 x2 x2
x2 x2 x2 x2
FIR1FIR0
x
sin(x)
x
sin(x)
FIR3FIR2
CD-Channel
FIR4
spat 9spat 11spat 11spat 32spat 95
Data Converters
Digital-to-Analog Converters – Current Steering DACs
Quad-Channel, 16-Bit, 1.5 GSPS DAC
DAC34SH84
The DAC34SH84 is a very low-power, high-dynamic range, quad-channel, 16-bit digital-
to-analog converter (DAC) with a sample rate as high as 1.5 GSPS. The device includes
featuresthatsimplifythedesignofcomplextransmitarchitectures:2×to16×digital
interpolation filters with over 90 dB of stop-band attenuation simplify the data interface
and reconstruction filters. Independent complex mixers allow flexible carrier placement.
The DAC34SH84 low-power, high-bandwidth support, superior crosstalk, high dynamic
range, and features are an ideal fit for next-generation communication systems.
In addition, the DAC34H84, DAC3484 and DAC3482 16-bit dual and quad-channel
DACs offer sample rates up to 1.25 GSPS. Learn more about the entire portfolio of TI’s
current steering DACs at www.ti.com/dataconverters.
DAC34SH84 functional block diagram
Key Features
• Lowpower
• Multi-DACsynchronization
• Selectable2×,4×,8×,16×
interpolation filter
•
Flexibleon-chipcomplexmixing
• High-performance,low-jitter
clock-multiplying PLL
•
DigitalIandQcorrection
• Digitalinversesincfilters
• 32-bitDDRflexibleLVDSinput
data bus
•
Differentialscalableoutput:
10 mA to 30 mA
•
196-ball,12-mm×12-mmBGA
Applications
• Cellularbasestations
• Diversitytransmit
• Widebandcommunications
Get more information: www.ti.com/product/DAC34SH84