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| 型号： | AD9767-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9767 |
| 产品培训模块： | DAC Architectures |
| 标准包装： | 1 |
| 系列： | TxDAC+® |
| DAC 的数量： | 2 |
| 位数： | 14 |
| 采样率（每秒）： | 125M |
| 数据接口： | 并联 |
| 设置时间： | 35ns |
| DAC 型： | 电流 |
| 工作温度： | -40°C ~ 85°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD9767 |
| 相关产品： | AD9767ASTZRL-ND - IC DAC 14BIT DUAL 125MSPS 48LQFP AD9767ASTZ-ND - IC DAC 14BIT DUAL 125MSPS 48LQFP |
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AD9763/AD9765/AD9767
Data Sheet
Rev. G | Page 28 of 44
APPLYING THE AD9763/AD9765/AD9767
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configurations
for the AD9763/AD9765/AD9767, with IOUTFS set to a nominal
20 mA, unless otherwise noted. For applications requiring the
optimum dynamic performance, a differential output configuration
is suggested. A differential output configuration can consist of
either an RF transformer or a differential op amp configuration.
The transformer configuration provides the optimum high
frequency performance and is recommended for any application
allowing for ac coupling. The differential op amp configuration
is suitable for applications requiring dc coupling, bipolar
output, signal gain, and/or level shifting within the bandwidth
of the chosen op amp.
A single-ended output is suitable for applications requiring
a unipolar voltage output. A positive unipolar output voltage
results if IOUTA and/or IOUTB is connected to an appropriately
sized load resistor (RLOAD) referred to as ACOM. This configuration
may be more suitable for a single-supply system requiring a
dc-coupled, ground-referred output voltage. Alternatively, an
amplifier can be configured as an I-V converter, thus converting
IOUTA or IOUTB into a negative unipolar voltage. This configura-
tion provides the best dc linearity because IOUTA or IOUTB is
maintained at a virtual ground. Note that IOUTA provides slightly
better performance than IOUTB.
DIFFERENTIAL COUPLING USING A
TRANSFORMER
An RF transformer can be used as shown in Figure 72 to
perform a differential-to-single-ended signal conversion. A
differentially coupled transformer output provides the optimum
distortion performance for output signals whose spectral content
lies within the pass band of the transformer. An RF transformer
such as the Mini-Circuits T1-1T provides excellent rejection of
common-mode distortion (that is, 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.
Transformers with different impedance ratios can also be used
for impedance matching purposes. Note that the transformer
provides ac coupling only.
RLOAD
AD9763/
AD9765/
AD9767
IOUTA
IOUTB
Mini-Circuits
T1-1T
OPTIONAL
RDIFF
00
61
7-
07
2
Figure 72. Differential Output Using a Transformer
The center tap on the primary side of the transformer must be
connected to ACOM to provide the necessary dc current path
for both IOUTA and IOUTB. The complementary voltages appearing
at IOUTA and IOUTB (that is, VOUTA and VOUTB) swing symmetrically
around ACOM and must be maintained with the output compli-
ance range of the AD9763/AD9765/AD9767 to achieve the
specified performance. A differential resistor (RDIFF) can be
inserted in applications where the output of the transformer is
connected to the load (RLOAD) via a passive reconstruction filter
or cable. RDIFF is determined by the transformer’s impedance
ratio and provides the proper source termination that results in a
low VSWR. Approximately half the signal power will be dissipated
across RDIFF.
DIFFERENTIAL COUPLING USING AN OP AMP
An op amp can also be used as shown in Figure 73 to perform a
differential-to-single-ended conversion. The AD9763/AD9765/
AD9767 is configured with two equal load resistors (RLOAD) of
25 Ω each. The differential voltage developed across IOUTA and
IOUTB is converted to a single-ended signal via the differential
op amp configuration. An optional capacitor can be installed
across IOUTA and IOUTB, forming a real pole in a low-pass filter.
The addition of this capacitor often enhances the op amp’s
distortion performance by preventing the DAC’s high-slewing
output from overloading the op amp’s input.
AD9763/
AD9765/
AD9767
500
225
25
AD8047
IOUTA
IOUTB
225
COPT
0
061
7-
0
73
Figure 73. DC Differential Coupling Using an Op Amp
The common-mode rejection of this configuration is typically
determined by the resistor matching. In this circuit, the
differential op amp circuit using the AD8047 is configured to
provide some additional signal gain. The op amp must operate
from a dual supply because its output is approximately ±1.0 V.
Select a high speed amplifier capable of preserving the
differential performance of the AD9763/AD9765/AD9767
while meeting other system level objectives (that is, cost or
power). Consider the op amp’s differential gain, gain setting
resistor values, and full-scale output swing capabilities when
optimizing this circuit.
The differential circuit shown in Figure 74 provides the
necessary level shifting required in a single-supply system.
In this case, AVDD, which is the positive analog supply for both
the AD9763/AD9765/AD9767 and the op amp, is used to level
shift the differential output of the AD9763/AD9765/AD9767 to
midsupply (that is, AVDD/2). The AD8055 is a suitable op amp
for this application.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9768 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultrahigh Speed IC D/A Converter |
| AD9768JD | 制造商:Rochester Electronics LLC 功能描述:AD9768 IC - Bulk |
| AD9768JQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9768SD | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultrahigh Speed IC D/A Converter |
| AD9768SE | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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