参数资料
| 型号： | AD9763ASTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 24/44页 |
| 文件大小： | 0K |
| 描述： | IC DAC 10BIT DUAL 125MSPS 48LQFP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 1 |
| 系列： | TxDAC+® |
| 设置时间： | 35ns |
| 位数： | 10 |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 电压电源： | 模拟和数字 |
| 功率耗散（最大）： | 450mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
| 输出数目和类型： | 4 电流，单极；4 电流，双极 |
| 采样率（每秒）： | 125M |
| 产品目录页面： | 785 (CN2011-ZH PDF) |
| 配用： | AD9763-EBZ-ND - BOARD EVAL FOR AD9763 |
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AD9763/AD9765/AD9767
Data Sheet
Rev. G | Page 30 of 44
Proper grounding and decoupling are primary objectives in any
high speed, high resolution system. The AD9763/AD9765/AD9767
features separate analog and digital supply and ground pins to
optimize the management of analog and digital ground currents
in a system. In general, decouple the analog supply (AVDD) to
the analog common (ACOM) as close to the chip as physically
possible. Similarly, decouple the digital supply (DVDD1/DVDD2)
to the digital common (DCOM1/DCOM2) as close to the chip
as possible.
Note that the data in Figure 77 is given in terms of current out
vs. voltage in. Noise on the analog power supply has the effect
of modulating the internal current sources and therefore the
output current. The voltage noise on AVDD, therefore, is added
in a nonlinear manner to the desired IOUT. PSRR is very code
dependent, thus producing mixing effects that can modulate
low frequency power supply noise to higher frequencies. Worst-
case PSRR for either one of the differential DAC outputs occurs
when the full-scale current is directed toward that output. As a
result, the PSRR measurement in Figure 77 represents a worst-
case condition in which the digital inputs remain static and the
full-scale output current of 20 mA is directed to the DAC
output being measured.
For those applications that require a single 5 V or 3.3 V supply
for both the analog and digital supplies, a clean analog supply
can be generated using the circuit shown in Figure 78. The
circuit consists of a differential LC filter with separate power
supply and return lines. Lower noise can be attained by using
low-ESR type electrolytic and tantalum capacitors.
An example serves to illustrate the effect of supply noise on the
analog supply. Suppose a switching regulator with a switching
frequency of 250 kHz produces 10 mV of noise and, for simplicity’s
sake, all of this noise is concentrated at 250 kHz (that is, ignore
harmonics). To calculate how much of this undesired noise will
appear as current noise superimposed on the DAC full-scale
current, IOUTFS, one must determine the PSRR in decibels using
such that the units of PSRR are converted from A/V to V/V,
For example, if RLOAD is 50 Ω, the PSRR is reduced by 34 dB (that
is, the PSRR of the DAC at 250 kHz, which is 85 dB in Figure 77,
becomes 51 dB VOUT/VIN).
TTL/CMOS
LOGIC
CIRCUITS
100F
0.1F
AVDD
ACOM
ELECTROLYTIC
TANTALUM
CERAMIC
5V
POWER SUPPLY
FERRITE
BEADS
10F
TO
22F
00
61
7-
0
78
Figure 78. Differential LC Filter for Single 5 V and 3.3 V Applications
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9763ASTZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9763ASTZRL | 功能描述:IC DAC 10BIT DUAL 125MSPS 48LQFP 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: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）:* |
| AD9763-EB | 制造商:Analog Devices 功能描述: |
| AD9763-EBZ | 功能描述:BOARD EVAL FOR AD9763 RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:TxDAC+® 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 |
| AD9764 | 制造商:Analog Devices 功能描述: |
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