参数资料
| 型号： | AD9760ARU50 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/23页 |
| 文件大小： | 0K |
| 描述： | IC DAC 10BIT 50MSPS 28-TSSOP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 50 |
| 系列： | TxDAC® |
| 设置时间： | 35ns |
| 位数： | 10 |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字 |
| 功率耗散（最大）： | 175mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 输出数目和类型： | 2 电流，单极；2 电流，双极 |
| 采样率（每秒）： | 60M |
| 配用： | AD9760-EBZ-ND - BOARD EVAL FOR AD9760 |
AD9760
–16–
REV. B
APPLYING THE AD9760
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output configura-
tions for the AD9760. Unless otherwise noted, it is assumed
that IOUTFS is set to a nominal 20 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. The transformer configuration provides the opti-
mum 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, 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 IOUTA and/or IOUTB is connected to an appropriately
sized load resistor, RLOAD, referred to ACOM. This configura-
tion may be more suitable for a single-supply system requiring
a dc coupled, ground referred output voltage. Alternatively, an
amplifier could be configured as an I-V converter, thus convert-
ing IOUTA or IOUTB into a negative unipolar voltage. This con-
figuration provides the best dc linearity since 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 to perform a differential-to-
single-ended signal conversion as shown in Figure 50. A
differentially coupled transformer output provides the optimum
distortion performance for output signals whose spectral content
lies within the transformer’s passband. An RF transformer such
as the Mini-Circuits T1-1T provides excellent rejection of com-
mon-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. Trans-
formers with different impedance ratios may also be used for
impedance matching purposes. Note that the transformer
provides ac coupling only.
RLOAD
AD9760
22
21
MINI-CIRCUITS
T1-1T
OPTIONAL RDIFF
IOUTA
IOUTB
Figure 50. 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 appear-
ing at IOUTA and IOUTB (i.e., VOUTA and VOUTB) swing symmetri-
cally around ACOM and should be maintained with the specified
output compliance range of the AD9760. A differential resistor,
RDIFF, may be inserted in applications where the output of the
transformer is connected to the load, RLOAD, via a passive re-
construction filter or cable. RDIFF is determined by the
transformer’s impedance ratio and provides the proper source
termination that results in a low VSWR. Note that approxi-
mately half the signal power will be dissipated across RDIFF.
DIFFERENTIAL USING AN OP AMP
An op amp can also be used to perform a differential to single-
ended conversion as shown in Figure 51. The AD9760 is con-
figured with two equal load resistors, RLOAD, of 25
. The
differential voltage developed across IOUTA and IOUTB is con-
verted to a single-ended signal via the differential op amp con-
figuration. An optional capacitor can be installed across IOUTA
and IOUTB, forming a real pole in a low-pass filter. The addition
of this capacitor also enhances the op amps distortion perfor-
mance by preventing the DACs high slewing output from over-
loading the op amp’s input.
AD9760
22
IOUTA
IOUTB 21
COPT
500
225
500
25
AD8047
Figure 51. 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 differ-
ential op amp circuit using the AD8047 is configured to provide
some additional signal gain. The op amp must operate off of a
dual supply since its output is approximately
±1.0 V. A high
speed amplifier capable of preserving the differential perfor-
mance of the AD9760 while meeting other system level objec-
tives (i.e., cost, power) should be selected. The op amps
differential gain, its gain setting resistor values, and full-scale
output swing capabilities should all be considered when opti-
mizing this circuit.
The differential circuit shown in Figure 52 provides the neces-
sary level-shifting required in a single supply system. In this
case, AVDD which is the positive analog supply for both the
AD9760 and the op amp is also used to level-shift the differ-
ential output of the AD9760 to midsupply (i.e., AVDD/2). The
AD8041 is a suitable op amp for this application.
AD9760
22
IOUTA
IOUTB 21
COPT
500
225
1k
25
AD8041
1k
AVDD
Figure 52. Single-Supply DC Differential Coupled Circuit
SINGLE-ENDED UNBUFFERED VOLTAGE OUTPUT
Figure 53 shows the AD9760 configured to provide a unipolar
output range of approximately 0 V to +0.5 V for a doubly termi-
nated 50
cable since the nominal full-scale current, IOUTFS, of
20 mA flows through the equivalent RLOAD of 25
. In this case,
RLOAD represents the equivalent load resistance seen by IOUTA or
IOUTB. The unused output (IOUTA or IOUTB) can be connected
to ACOM directly or via a matching RLOAD. Different values of
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| AD9760ARU50RL | 功能描述:INTEGRATED CIRCUIT 制造商:analog devices inc. 系列:* 包装:带卷（TR） 零件状态:最後搶購 封装/外壳:28-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:28-TSSOP 标准包装:1 |
| AD9760ARU50RL7 | 功能描述:IC DAC 10BIT 50MSPS 28-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TxDAC® 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
| AD9760ARURL | 功能描述:INTEGRATED CIRCUIT 制造商:analog devices inc. 系列:* 包装:带卷（TR） 零件状态:最後搶購 封装/外壳:28-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:28-TSSOP 标准包装:1 |
| AD9760ARURL7 | 制造商:Analog Devices 功能描述:DAC 1-CH 10-bit 28-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9760ARUZ | 功能描述:IC DAC 10BIT 125MSPS 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TxDAC® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 设置时间:4µs 位数:12 数据接口:串行 转换器数目:2 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-uMAX 包装:管件 输出数目和类型:2 电压，单极 采样率（每秒）:* 产品目录页面:1398 (CN2011-ZH PDF) |
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