参数资料
| 型号： | AD5348BRUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC DAC 12BIT OCTAL VOUT 38-TSSOP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 50 |
| 设置时间： | 8µs |
| 位数： | 12 |
| 数据接口： | 并联 |
| 转换器数目： | 8 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 8.3mW |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 38-TSSOP |
| 包装： | 管件 |
| 输出数目和类型： | 8 电压，单极；8 电压，双极 |
| 采样率（每秒）： | 125k |
| 产品目录页面： | 782 (CN2011-ZH PDF) |
AD5346/AD5347/AD5348
Rev. 0 | Page 21 of 24
COARSE AND FINE ADJUSTMENT USING
THE AD5346/AD5347/AD5348
Two of the DACs in the AD5346/AD5347/AD5348 can be
paired together to form a coarse and fine adjustment function,
as shown in Figure 47. As with the window comparator
previously described, the description refers to DACs A and B.
DAC A provides the coarse adjustment, while DAC B provides
the fine adjustment. Varying the ratio of R1 and R2 changes the
relative effect of the coarse and fine adjustments. With the
resistor values shown, the output amplifier has unity gain for
the DAC A output, so the output range is 0 V to (VREF – 1 LSB).
For DAC B, the amplifier has a gain of 7.6 × 10–3, giving DAC B
a range equal to 2 LSBs of DAC A.
The circuit is shown with a 2.5 V reference, but reference
voltages up to VDD may be used. The op amps indicated allow a
rail-to-rail output swing.
AD780/ADR381/REF192
WITH VDD = 5V
VDD = 5V
VOUT
5V
EXT
REF
VOUT
VIN
GND
AD5346/AD5347/
AD5348
VOUTB
VOUTA
VDD
VREFAB
R1
390
R4
390
R2
51.2k
R3
51.2k
0.1
F
0.1
F
10
F
03331-0-030
Figure 47. Coarse and Fine Adjustment
POWER SUPPLY BYPASSING AND GROUNDING
In any circuit where accuracy is important, careful consideration
of the power supply and ground return layout helps to ensure
the rated performance.
The printed circuit board on which the AD5346/AD5347/
AD5348 is mounted should be designed so that the analog and
digital sections are separated and are confined to certain areas
of the board. This facilitates the use of ground planes that can
be separated easily. A minimum etch technique is generally best
for ground planes because it gives the best shielding. Digital and
analog ground planes should be joined in one place only. If the
AD5346/AD5347/AD5348 is the only device requiring an
AGND-to-DGND connection, then the ground planes should
be connected at the AGND and DGND pins of the AD5346/
AD5347/AD5348. If the AD5346/AD5347/AD5348 is in a
system where multiple devices require AGND-to-DGND
connections, the connection should be made at one point only, a
star ground point that should be established as close as possible
to the AD5346/AD5347/AD5348.
The AD5346/AD5347/AD5348 should have ample supply
bypassing of 10 F in parallel with 0.1 F on the supply located
as close to the package as possible, ideally right up against the
device. The 10 F capacitors are the tantalum bead type. The
0.1 F capacitor should have low effective series resistance
(ESR) and effective series inductance (ESI), such as the
common ceramic types that provide a low impedance path to
ground at high frequencies to handle transient currents due to
internal logic switching.
The power supply lines of the device should use the largest trace
possible to provide low impedance paths and to reduce the
effects of glitches on the power supply line. Fast switching
signals such as clocks should be shielded with digital ground to
avoid radiating noise to other parts of the board, and should
never be run near the reference inputs. Avoid crossover of
digital and analog signals. Traces on opposite sides of the board
should run at right angles to each other to reduce the effects of
feedthrough through the board. A microstrip technique is by far
the best, but not always possible with a double-sided board. In
this technique, the component side of the board is dedicated to
ground plane, while signal traces are placed on the solder side.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD5348BRUZRUZ | 制造商:Analog Devices 功能描述:DAC,AD5348B 12bit 8us octal TSSOP |
| AD534J | 制造商:AD 制造商全称:Analog Devices 功能描述:Internally Trimmed Precision IC Multiplier |
| AD534JD | 功能描述:IC TRIMMED MULTIPLIER/DIV 14-DIP RoHS:否 类别:集成电路 (IC) >> 线性 - 模拟乘法器，除法器 系列:- 标准包装:25 系列:HA 功能:模拟乘法器 位元/级数:四象限 封装/外壳:16-CDIP（0.300"，7.62mm） 供应商设备封装:16-CDIP 侧面铜焊 包装:管件 |
| AD534JD/+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Multiplier/Divider |
| AD534JDZ | 功能描述:IC MULTIPLIER PREC TRIM 14-CDIP RoHS:是 类别:集成电路 (IC) >> 线性 - 模拟乘法器，除法器 系列:- 标准包装:25 系列:HA 功能:模拟乘法器 位元/级数:四象限 封装/外壳:16-CDIP（0.300"，7.62mm） 供应商设备封装:16-CDIP 侧面铜焊 包装:管件 |
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