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PDF LTC2000 Data sheet ( Hoja de datos )
| Número de pieza | LTC2000 | |
| Descripción | 16-/14-/11-Bit 2.5Gsps DACs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 fOUT
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
SVDD
DAP/N[15:0]
DBP/N[15:0]
4:1 16-BIT DAC
IOUTP
50Ω
50Ω IOUTN
DCKIP/N
DCKOP/N
AVDD18
DELAY
ADJUST
CLK DIVIDER
÷2 OR ÷4
DVDD18
AVDD33
CLOCK
SYNC
DVDD33
GND
GAIN
ADJUST
CLK
RECEIVER
CKP/N
10k
REF
FSADJ
REFIO
2000 BD
For more information www.linear.com/LTC2000
SFDR vs fOUT, fDAC = 2.5Gsps
100
DIGITAL AMPLITUDE = 0dBFS
IOUTFS = 40mA
90
80
70
60
50
0
200 400 600 800 1000 1200
fOUT (MHz)
2000 TA01b
2000f
1
1 page  
LTC2000
E lectrical Characteristics The l denotes the specifications which apply over the full operating
tSeVmDpDe=ra1t.u7r1eVratong3e.,46o5thVe,rRwFiSsAeDsJp=ec5i0fi0cΩat,io1n2s.5aΩrelaotadTAfr=om25I°OCU.TAP/VNDtDo18G,NDDViDnDc1l8ud=in1g.7i1nVtetrona1l.8590VΩ, AteVrDmDi3n3a,tDioVnD,Du3n3l=es3s.1o3th5eVrwtois3e.465V,
specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
DC Performance
Resolution
LTC2000-16
l 16
Bits
LTC2000-14
l 14
Bits
LTC2000-11
l 11
Bits
DNL Differential Nonlinearity
LTC2000-16
l
±0.5 ±2.7
LSB
LTC2000-14
l
±0.2 ±1
LSB
LTC2000-11
l
±0.1 ±0.5
LSB
INL Integral Nonlinearity
LTC2000-16
l
±1 ±4
LSB
LTC2000-14
l
±0.5 ±2
LSB
LTC2000-11
l
±0.2 ±1
LSB
Offset Error
LTC2000-16
l
±0.05
% FSR
LTC2000-14
l
±0.06
% FSR
LTC2000-11
l
±0.09
% FSR
Offset Error Drift
1 ppm/°C
Gain Error
±0.5 % FSR
Gain Error Drift
5 ppm/°C
Power Supply Rejection Ratio
Analog Output
Full-Scale; AVDD33 = 3.135V to 3.465V
69 dB
Full-Scale Output Current
Output Compliance Range
RFSADJ = 500Ω
l –1
40
1
mA
V
Output Resistance
Output Capacitance
IOUTP/N to GND
l 42 50 58
6
Ω
pF
Output Bandwidth
AC Performance
RIOUTP/N = 12.5Ω, –3dB Excluding sin(x)/x
2.1 GHz
Maximum Update Rate
Dual-Port Mode
Single-Port Mode
l 2.5
l 1.25
Gsps
Gsps
SFDR
Spurious Free Dynamic Range
fDAC = 1.25Gsps, 0dBFS
Spurious Free Dynamic Range
fDAC = 2.5Gsps, 0dBFS
IMD 2-Tone Intermodulation Distortion
fOUT2 = fOUT1 + 1.25MHz
fDAC = 1.25Gsps, –6dBFS
2-Tone Intermodulation Distortion
ffODUACT2==2f.O5UGTs1p+s,1–.265dMBFHSz
ffOOUUTT
=
=
50MHz, LIN_DIS = 0, LIN_GN = 75%
100MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 250MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 500MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 100MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 200MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 500MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 1000MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 500MHz, LIN_DIS = 1
fOUT = 1000MHz, LIN_DIS = 1
fOUT = 50MHz, LIN_DIS = 0, LIN_GN = 75%
fOUT = 100MHz, LIN_DIS = 0, LIN_GN = 75%
ffOOUUTT
=
=
250MHz,
500MHz,
LIN_DIS
LIN_DIS
=
=
0,
0,
LIN_GN
LIN_GN
=
=
75%
75%
fOUT = 100MHz, LIN_DIS = 1
ffOOUUTT
=
=
200MHz,
500MHz,
LIN_DIS
LIN_DIS
=
=
1
1
fOUT = 1000MHz, LIN_DIS = 1
ffOOUUTT
=
=
500MHz, LIN_DIS = 0, LIN_GN = 75%
1000MHz, LIN_DIS = 0, LIN_GN = 75%
l
67
82
82
74
74
76
74
72
68
66
62
100
90
90
82
87
86
84
78
80
67
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
For more information www.linear.com/LTC2000
2000f
5
5 Page 
LTC2000
Typical Performance Characteristics
AVDD33
=
DVDD33
=
3.3V,
RLOAD
=
12.5Ω,
LIN_DIS
=
0,
LIN_
GN
=
75%
unless
otherIwOiUsTeFSno=te4d0.mA,
TA
=
25°C,
AVDD18
=
DVDD18
=
1.8V,
(HdDB3FSvs),ffODUATCa=nd2.D5Gigsiptasl Amplitude
100
90
2-Tone IMD vs fOUT and fDAC
110
DIGITAL AMPLITUDE = –6dBFS
F2 = F1 + 1.25MHz
100 LIN_DIS = 1
2-Tone IMD
Amplitude,
fvDsACfO=UT2.a5nGdsDpsigital
110
F2 = F1 + 1.25MHz
LIN_DIS = 1
100
80 90
90
70
60
50
0
0dBFS
–3dBFS
–6dBFS
–12dBFS
–16dBFS
200 400 600 800 1000 1200
fOUT (MHz)
2000 G19
2-Tone IMD vs fOUT and fDAC with
Default Linearization
110 DIGITAL AMPLITUDE = –6dBFS
F2 = F1 + 1.25MHz
100
2.5Gsps
2.0Gsps
1.6Gsps
1.25Gsps
90
80
80
2.5Gsps
70 2.0Gsps
60
0
1.6Gsps
1.25Gsps
200 400 600 800 1000 1200
fOUT (MHz)
2000 G20
2-Tone IMD vs fOUT and
Linearization Setting,
fDAC = 2.5Gsps
110
LIN_GN = 100%
LIN_GN = 75%
100
LIN_GN = 50%
LIN_GN = 1%
90
80
80
70
60
0
0dBFS
–6dBFS
–12dBFS
–16dBFS
200 400 600 800
fOUT (MHz)
1000 1200
2000 G21
SSeFtDtiRngv,sffDOAUCT=an2d.5LGisnpesarization
100
DIGITAL AMPLITUDE = 0dBFS
LIN_GN = 100%
90
LIN_GN = 75%
LIN_GN = 50%
LIN_DIS = 1
80
70
70
LIN_DIS = 0
LIN_GN = 75%
60
0 200 400 600 800
fOUT (MHz)
1000 1200
2000 G22
SHeDt3tinvgs,fOfDUATCa=nd2.L5iGnespasrization
100
DIGITAL AMPLITUDE = 0dBFS
LIN_GN = 100%
90
LIN_GN = 75%
LIN_GN = 50%
LIN_DIS = 1
80
70
DIGITAL AMPLITUDE = –6dBFS
60 F2 = F1 + 1.25MHz
0 200 400 600
800
fOUT (MHz)
1000 1200
2000 G23
LTC2000-16 Single-Tone NSD
vs fOUT and fDAC
–145
–150
DIGITAL AMPLITUDE = 0dBFS
40mA FULL-SCALE CURRENT
0dBm SINGLE-TONE
2.5Gsps
1.25Gsps
–155
70 –160
60
50
0
200 400 600 800 1000 1200
fOUT (MHz)
2000 G25
–165
–170
0
200 400 600 800 1000 1200
fOUT (MHz)
2000 G26
For more information www.linear.com/LTC2000
60
50
0
200 400 600 800 1000 1200
fOUT (MHz)
2000 G24
LTC2000-16 Single-Tone NSD
vs fOUT and IOUTFS
–145
DIGITAL AMPLITUDE = 0dBFS
–150
fDAC = 2.5Gsps
12.5Ω TOTAL OUTPUT LOAD
60mA
–155
40mA
–160
20mA
–165
–170
0
200 400 600 800 1000 1200
fOUT (MHz)
2000 G27
2000f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2000.PDF ] | |
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