参数资料
| 型号： | AD9709ASTZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT DUAL 125MSPS 48-LQFP |
| 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： | 8 |
| 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： | AD9709-EBZ-ND - BOARD EVAL FOR AD9709 |
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AD9709
Rev. B | Page 21 of 32
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 instance, 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
Proper grounding and decoupling should be a primary
objective in any high speed, high resolution system. The
AD9709 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 DVDD1/DVDD2, the
digital supply (DVDD1/DVDD2) to the digital common
(DCOM1/DCOM2) as close to the chip as possible.
For 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 42. 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.
TTL/CMOS
LOGIC
CIRCUITS
100F
0.1F
AVDD
ACOM
ELECTROLYTIC
TANTALUM
CERAMIC
5V
POWER SUPPLY
FERRITE
BEADS
10F
TO
22F
00
60
6-
0
41
Figure 42. 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 |
|---|---|
| AD9709ASTZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:8-Bit, 125 MSPS, Dual TxDAC Digital-to-Analog Converter |
| AD9709ASTZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9709ASTZRL | 功能描述:IC DAC 8BIT DUAL 125MSPS 48LQFP 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）:* |
| AD9709ASTZRL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:8-Bit, 125 MSPS, Dual TxDAC Digital-to-Analog Converter |
| AD9709-EB | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
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