參數(shù)資料
型號(hào)： AD9761
廠商： Analog Devices, Inc.
英文描述： Dual 10-Bit TxDAC with 23 Interpolation Filters(內(nèi)插濾波器的雙10位D/A轉(zhuǎn)換器)
中文描述： 雙10與23位插值濾波器TxDAC系列（內(nèi)插濾波器的雙10位的D / A轉(zhuǎn)換器）
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 294K
代理商： AD9761
AD9761
–15–
REV. 0
IOUTFS – mA
30
0
1
10
2
3
4
5
6
7
8
9
25
20
15
10
5
I
A
Figure 32. I
AVDD
vs. I
OUTFS
Conversely, I
DVDD
is dependent on both the digital input wave-
form, f
CLOCK
, and digital supply DVDD. Figures 33 and 34
show I
DVDD
as a function of a full-scale sine wave output ratio’s
(f
OUT
/f
CLOCK
) for various update rate with DVDD = 5 V and
DVDD = 3 V respectively
.
5 MSPS
RATIO – f
OUT
/f
CLK
40
30
0.05
0.15
40 MSPS
20
0
0.1
20 MSPS
10 MSPS
10
0
I
D
0.2
50
60
70
2.5 MSPS
Figure 33. I
DVDD
vs. Ratio @ DVDD = 5 V
5 MSPS
RATIO – f
OUT
/f
CLK
40
30
0.05
0.15
40 MSPS
20
0
0.1
20 MSPS
10 MSPS
10
0
I
D
0.2
2.5 MSPS
5
35
25
15
Figure 34. I
DVDD
vs. Ratio @ DVDD = 3 V
APPLYING T HE AD9761
OUT PUT CONFIGURAT IONS
T he following sections illustrate some typical output configura-
tions for the AD9761. Unless otherwise noted, it is assumed
that I
OUT FS
is set to a nominal 10 mA. For applications requir-
ing the optimum dynamic performance, a differential output
configuration is suggested. A differential output configuration
may consist of either an RF transformer or a differential op amp
configuration. T he transformer configuration provides the opti-
mum high frequency performance and is recommended for any
application allowing for ac coupling. T he differential op amp
configuration is suitable for applications requiring dc coupling, a
bipolar output, signal gain, and/or level shifting.
A single-ended output is suitable for applications requiring a
unipolar voltage output. A positive unipolar output voltage will
result if IOUT A and/or IOUT B is connected to an appropri-
ately sized load resistor, R
L OAD
, referred to ACOM. T his
configuration may be more suitable for a single-supply system
requiring a dc coupled, ground referred output voltage. Alterna-
tively, an amplifier could be configured as an I-V converter thus
converting I
OUT A
or I
OUT B
into a negative unipolar voltage. T his
configuration provides the best dc linearity since IOUT A or
IOUT B is maintained at a virtual ground.
DIFFE RE NT IAL COUPLING USING A T RANSFORME R
An RF transformer can be used to perform a differential-to-
single-ended signal conversion as shown in Figure 35. A differen-
tially coupled transformer output provides the optimum distortion
performance for output signals whose spectral content lies within
the transformers passband. An RF transformer such as the Mini
Circuits T 1-1T provides excellent rejection of common-mode
distortion (i.e., even-order harmonics) and noise over a wide
frequency range. It also provides electrical isolation and the
ability to deliver twice the power to the load. T ransformers with
different impedance ratios may also be used for impedance
matching purposes. Note that the transformer provides ac cou-
pling only.
OPTIONAL
R
DIFF
R
LOAD
MINI-CIRCUITS
T1-1T
IOUTA
IOUTB
AD9761
Figure 35. Differential Output Using a Transformer
T he center-tap on the primary side of the transformer must be
connected to ACOM to provide the necessary dc current path
for both I
OUT A
and I
OUT B
. T he complementary voltages appear-
ing at IOUT A and IOUT B (i.e., V
OUT A
and V
OUT B
) swing sym-
metrically around ACOM and should be maintained with the
specified output compliance range of the AD9761. A differential
resistor, R
DIFF
, may be inserted in applications in which the
output of the transformer is connected to the load, R
LOAD
, via a
passive reconstruction filter or cable requiring double termina-
tion. R
DIFF
is determined by the transformer’s impedance ratio
and provides the proper source termination which results in a
low VSWR. Note that approximately half the signal power will
be dissipated across R
DIFF
.
相關(guān)PDF資料
PDF描述
AD9762 Analog Devices: Data Converters: DAC 12-Bit, 10 ns to 100 ns Converters Selection Table
AD9762-EB 12-Bit, 125 MSPS TxDAC D/A Converter
AD9762AR 12-Bit, 125 MSPS TxDAC D/A Converter
AD9762ARU 12-Bit, 125 MSPS TxDAC D/A Converter
AD9765 Analog Devices: Data Converters: DAC 12-Bit, 10 ns to 100 ns Converters Selection Table
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