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| 型号： | AD9704-DPG2-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 35/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9704 |
| 标准包装： | 1 |
| 系列： | * |
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AD9704/AD9705/AD9706/AD9707
Data Sheet
Rev. B | Page 40 of 44
APPLICATIONS INFORMATION
OUTPUT CONFIGURATIONS
The following sections illustrate some typical output
Unless otherwise noted, it is assumed that IOUTFS is set to a
nominal 2 mA. 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
that allows ac coupling. The differential op amp configuration is
suitable for applications requiring dc coupling, signal gain,
and/or a low output impedance.
A single-ended output is suitable for applications where low
cost and low power consumption are primary concerns.
DIFFERENTIAL COUPLING USING A TRANSFORMER
An RF transformer can be used to perform a differential-to-single-
ended signal conversion, as shown in Figure 88. The distortion
performance of a transformer typically exceeds that available from
standard op amps, particularly at higher frequencies. Transformer
coupling provides excellent rejection of common-mode distortion
(that is, even-order harmonics) over a wide frequency range. It
also provides electrical isolation and can deliver voltage gain
without adding noise. Transformers with different impedance
ratios can also be used for impedance matching purposes. The
main disadvantages of transformer coupling are the low frequency
roll-off, lack of power gain, and the higher output impedance.
AD9704/AD9705
AD9706/AD9707
IOUTB
IOUTA
20
21
OPTIONAL RDIFF
RLOAD
05
92
6-
0
95
Figure 88. Differential Output Using a Transformer
The center tap on the primary side of the transformer must be
connected to a voltage that keeps the voltages on IOUTA and
IOUTB within the output common voltage range of the device.
Note that the dc component of the DAC output current is equal
to IFS/2 and flows out of both IOUTA and IOUTB. The center
tap of the transformer should provide a path for this dc current.
In many applications, AGND provides the most convenient
voltage for the transformer center tap. The complementary
voltages appearing at IOUTA and IOUTB (that is, VIOUTA and
VIOUTB) swing symmetrically around AGND and should be
maintained with the specified output compliance range of the
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, as
reflected by the transformer, is chosen to provide a source
termination that results in a low VSWR. Note that approxi-
mately half the signal power is dissipated across RDIFF.
SINGLE-ENDED BUFFERED OUTPUT USING AN OP
AMP
An op amp, such as the ADA4899-1, can be used to perform a
single-ended current-to-voltage conversion, as shown in Figure 89.
pair of series resistors, RS, off each output. The feedback resistor,
RFB, determines the peak signal swing by the following formula:
2
FS
FB
OUT
I
R
V
×
=
The common-mode voltage of the output is determined by the
following formula:
OUT
B
FB
REF
CM
V
R
V
+
×
=
1
The maximum and minimum voltages out of the amplifier are,
respectively, the following:
+
×
=
B
FB
REF
MAX
R
V
1
VMIN = VMAX IFS × RFB
+5V
AD9704/AD9705
AD9706/AD9707
IOUTA
IOUTB 20
RFB
VOUT
REFIO 23
21
RS
OTCM 19
CF
C
RS
RB
059
26
-10
0
+
–
ADA4899-1
–5V
Figure 89. Single-Supply Single-Ended Buffer
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| AD9704-EB | 制造商:Analog Devices 功能描述: |
| AD9705BCPZ | 功能描述:IC DAC TX 10BIT 175MSPS 32-LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TxDAC® 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD9705BCPZRL7 | 功能描述:IC DAC TX 10BIT 175MSPS 32-LFCSP 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:LTC263x 12-, 10-, and 8-Bit VOUT DAC Family 特色产品:LTC2636 - Octal 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference 标准包装:91 系列:- 设置时间:4µs 位数:10 数据接口:MICROWIRE?，串行，SPI? 转换器数目:8 电压电源:单电源 功率耗散（最大）:2.7mW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-DFN-EP（4x3） 包装:管件 输出数目和类型:8 电压，单极 采样率（每秒）:* |
| AD9705-DPG2-EBZ | 功能描述:BOARD EVAL FOR AD9705 RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| AD9705EB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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