16-Bit 2.5Gsps DAC

16-Bit 2.5Gsps DAC
LTC2000 SFDR vs Output Frequency
100
0 - 40mA
95
90
32-lane DDR LVDS
LTC2000
SFDR (dBc)
85
LTC2000
Data
Clock
625MHz
1.25 Gsps
80
2.5 Gsps
75
70
1.2 Gsps
65
60
40 - 0mA
Competition
55
50
0
100
2.4 Gsps
200
300
400
500
600
700
800
900
1000
Output Frequency (MHz)
2.5GHz
With >78dBc 2-Tone IMD Up to 1GHz, the LTC2000 Is Ideal
for Direct RF Synthesis
The LTC®2000 is a 2.5Gsps current steering DAC that offers unparalleled linearity to directly synthesize RF signals up to 1GHz
with exceptional spectral purity. With a nominal output current of 40mA, the LTC2000 is capable of generating an output that
is ±1V compliant into a 100Ω differential load, which is matched with its internal impedance – resulting in outstanding signal
integrity. The LTC2000 has very low additive phase noise and remarkably low latency (only 7.5 cycles for single port and only 11
cycles for dual port).
Features
nn
nn
nn
nn
nn
nn
80dBc SFDR at 70MHz fOUT and >68dBc Up to 1000MHz fOUT
>78dBc 2-Tone IMD from DC to 1000MHz
40mA Nominal Full-Scale (10mA to 60mA Range), ±1V Output Compliant
–165dBc/Hz Additive Phase Noise at 1MHz Offset from 65MHz fOUT
Single or Dual Port DDR LVDS and DHSTL Interface
Low Latency
157 Carrier DOCSIS Gap Channel
Narrowband ACLR, fDAC = 2.5Gsps
2-Tone IMD vs fOUT and fDAC
110
–30
DIGITAL AMPLITUDE = –6dBFS
F2 = F1 + 1.25MHz
LIN_DIS = 1
100
–40
–50
RBW = 30kHz, VBW = 3kHz
REF = –30dBm, ATTEN = 5dB
SWEEP = 24s
90
Exceptional linearity,
even at high output
frequencies, leads to
exceptional real-world
results in demanding
applications.
80
2.5Gsps
2.0Gsps
1.6Gsps
1.25Gsps
70
60
0
200
400
600
800
fOUT (MHz)
1000
1200
10dB/DIV
IMD (dBC)
–60
–70
–80
–90
–100
–110
–120
–130
481
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.
491
501
511
521
FREQUENCY (MHz)
531
–165dBc/Hz Additive Phase Noise at 1MHz Offset from 65MHz Output
Additive Phase Noise,
fOUT = 65MHz, fDAC = 2.5Gsps
–100
The LTC2000 was designed for low
additive phase noise, making it ideal for
demanding applications such as radar,
instrumentation, and test equipment.
PHASE NOISE (dBc/Hz)
–110
–120
–130
–140
–150
–160
–170
–180
0.01
100
0.1
1
10
OFFSET FREQUENCY (kHz)
1000
Low Latency
Single-Port Operation
DBP/N[15:0]
N
N+1
N+2
N+3
N+4
N+5
Dual-Port Operation
N+6
N+6
N+7
DCKIP/N
DAP/N[15:0]
N
N+2
N+4
N+6
N+8
N+10
DBP/N[15:0]
N+1
N+3
N+5
N+7
N+9
N+11
DCKIP/N
CKP/N
0.5
1.5
2.5
3.5
4.5
IOUTP/N
5.5
6.5
7.5
CKP/N
N
1
7.5 CYCLE LATENCY
2
3
4
5
6
7
IOUTP/N
That’s It!
8
9
10
11
N
N+1
10 CYCLE LATENCY
11 CYCLE LATENCY
LTDACGen Software Simplifies the Evaluation of the LTC2000
Define
View
and
Generate
www.linear.com/2000 n 1-800-4-LINEAR
0714
Similar pages