參數(shù)資料
型號(hào): LTC1668
廠商: Linear Technology Corporation
英文描述: 16-Bit, 50Msps Differential Current OutputDAC(16位,50Msps,差分電流輸出數(shù)模轉(zhuǎn)換器)
中文描述: 16位,50 MSPS的差分電流OutputDAC(16位,50 MSPS的,差分電流輸出數(shù)模轉(zhuǎn)換器)
文件頁數(shù): 8/16頁
文件大小: 732K
代理商: LTC1668
8
LTC1668
APPLICATIOU
accuracy improves rapidly, roughly in proportion to
1/I
OUTFS
. The AC performance tends to be less affected by
reducing I
OUTFS
, except for the unavoidable affects on
SFDR and THD due to increased INL and DNL.
W
U
U
Output Configurations
Based on the specific application requirements, the
LTC1668 allows a choice of the best of several output
configurations. Voltage outputs can be generated by ex-
ternal load resistors, transformer coupling or with an op
amp I-to-V converter. Single-ended DAC output configu-
rations use only one of the outputs, preferably I
OUT A
, to
produce a single-ended voltage output. Differential mode
configurations use the difference between I
OUT A
and
I
OUT B
to generate an output voltage, V
DIFF
, as shown in
equation 7. Differential mode gives much better accuracy
in most AC applications. Because the DAC chip is the point
of interface between the digital input signals and the
analog output, some small amount of noise coupling to
I
OUT A
and I
OUT B
is unavoidable. Most of that digital noise
is common mode and is canceled by the differential mode
circuit. Other significant digital noise components can be
modeled as V
REF
or I
OUTFS
noise. In single-ended mode,
I
OUTFS
noise is gone at zero scale and is fully present at full
scale. In differential mode, I
OUTFS
noise is cancelled at
midscale input, corresponding to zero analog output.
Many AC signals, including broadband and multitone
communications signals with high peak to average ratios,
stay mostly near midscale.
Differential transformer-coupled output configurations
usually give the best AC performance. An example is the
AC Characterization Setup circuit, Figure 2. The advan-
tages of transformer coupling include excellent rejection
of common mode distortion and noise over a broad
frequency range and convenient differential-to-single-
ended conversion with isolation or level shifting. Also, as
much as twice the power can be delivered to the load, and
impedance matching can be accomplished by selecting
the appropriate transformer turns ratio. The center tap on
the primary side of the transformer is tied to ground to
provide the DC current path for I
OUT A
and I
OUT B
. For low
distortion, the DC average of the I
OUT A
and I
OUT B
currents
must be exactly equal to avoid biasing the core. This is
especially important for compact RF transformers with
small cores. The circuit in Figure 2 uses a Mini-Circuits
T1-1T RF transformer with a 1:1 turns ratio. The load
+
16-BIT
HIGH SPEED
DAC
HP1663EA
LOGIC ANALYZER WITH
PATTERN GENERATOR
2.5V
REFERENCE
V
SS
V
DD
–5V
LADCOM
AGND
DGND
CLK
DB15
DB0
16
DIGITAL
DATA
CLK
IN
1668 F02
I
OUT A
0.1
μ
F
LTC1668
5V
I
REFIN
REFOUT
COMP1
COMP2
C2
0.1
μ
F
0.1
μ
F
OUT 1 OUT 2
C1
0.1
μ
F
R
SET
2k
I
OUT B
HP8110A DUAL
PULSE GENERATOR
LOW JITTER
CLOCK SOURCE
CLK
IN
50
0.1
μ
F
50
TO HP3589A
SPECTRUM
ANALYZER
50
INPUT
110
MINI-CIRCUITS
T1–1T
Figure 2. AC Characterization Setup
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