LTC2000_15 Datasheet, PDF (1/52 Pages) Linear Technology – 16-/14-/11-Bit 2.5Gsps DACs

Features
n _{80dBc SFDR at 70MHz fOUT}
n _{>68dBc SFDR from DC to 1000MHz fOUT}
n _{40mA Nominal Full-Scale, ±1V Output Compliant}
n _{10mA to 60mA Adjustable Full-Scale Current Range}
n _{Single or Dual Port DDR LVDS and DHSTL Interface}
n _{Low Latency (7.5 Cycles for Single Port,}
11 Cycles for Dual Port)
n _{>78dBc 2-Tone IMD from DC to 1000MHz fOUT}
n _{–165dBc/Hz Additive Phase Noise at 1MHz Offset for}
65MHz f_OUT
n _{170-Lead (9mm × 15mm) BGA Package}
Applications
n _{Broadband Communication Systems}
n _{DOCSIS CMTS}
n _{Direct RF Synthesis}
n _Radar
n _{Instrumentation}
n _{Automatic Test Equipment}
LTC2000
16-/14-/11-Bit 2.5Gsps
DACs
Description
The LTC^®2000 is a family of 16-/14-/11-bit 2.5Gsps cur-
rent steering DACs with exceptional spectral purity.
The single (1.25Gsps mode) or dual (2.5Gsps mode) port
source synchronous LVDS interface supports data rates of
up to 1.25Gbps using a 625MHz DDR data clock, which
can be either in quadrature or in phase with the data. An
internal synchronizer automatically aligns the data with
the DAC sample clock.
Additional features such as pattern generation, LVDS
loopout and junction temperature sensing simplify system
development and testing.
A serial peripheral interface (SPI) port allows configura-
tion and read back of internal registers. Operating from
1.8V and 3.3V supplies, the LTC2000 consumes 2.2W at
2.5Gsps and 1.3W at 1.25Gsps.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 8330633.
Block Diagram
TSTP/N
JUNCTION
TEMPERATURE
PATTERN
GENERATOR
PD CS SCK SDI SDO
SPI
SV_DD
DAP/N[15:0]
DBP/N[15:0]
4:1
16-BIT DAC
I_OUTP
50Ω
50Ω _IOUTN
DCKIP/N
DCKOP/N
DELAY
ADJUST
CLK DIVIDER
÷2 OR ÷4
AV_DD18
DV_DD18
AV_DD33
CLOCK
SYNC
DV_DD33
GND
GAIN
ADJUST
CLK
RECEIVER
CKP/N
10k
REF
FSADJ
REFIO
2000 BD
For more information www.linear.com/LTC2000
SFDR vs f_OUT, f_DAC = 2.5Gsps
100
DIGITAL AMPLITUDE = 0dBFS
I_OUTFS = 40mA
90
80
70
60
50
0
200 400 600 800 1000 1200
f_OUT (MHz)
2000 TA01b
2000f
1