参数资料
型号: AD9742ARUZRL7
厂商: Analog Devices Inc
文件页数: 10/32页
文件大小: 0K
描述: IC DAC 12BIT 210MSPS 28-TSSOP
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 1,000
系列: TxDAC®
设置时间: 11ns
位数: 12
数据接口: 并联
转换器数目: 1
电压电源: 模拟和数字
功率耗散(最大): 145mW
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: 带卷 (TR)
输出数目和类型: 2 电流,单极;2 电流,双极
采样率(每秒): 210M
配用: AD9742ACP-PCBZ-ND - BOARD EVAL FOR AD9742ACP
AD9742
Data Sheet
Rev. C | Page 18 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 (ignoring harmonics), all of this noise is concentrated at
250 kHz. To calculate how much of this undesired noise will
appear as current noise superimposed on the DAC’s full-scale
current, IOUTFS, one must determine the PSRR in dB using Figure 36
at 250 kHz. To calculate the PSRR for a given RLOAD, such that the
units of PSRR are converted from A/V to V/V, adjust the curve in
Figure 36 by the scaling factor 20 log (RLOAD). For instance, if
RLOAD is 50 , the PSRR is reduced by 34 dB (i.e., PSRR of the DAC
at 250 kHz, which is 85 dB in Figure 36, becomes 51 dB VOUT/VIN).
Proper grounding and decoupling should be a primary objective in
any high speed, high resolution system. The AD9742 features
separate analog and digital supplies and ground pins to optimize
the management of analog and digital ground currents in a
system. In general, AVDD, the analog supply, should be decoupled
to ACOM, the analog common, as close to the chip as physically
possible. Similarly, DVDD, the digital supply, should be decoupled
to DCOM as close to the chip as physically possible.
For those applications that require a single 3.3 V supply for both
the analog and digital supplies, a clean analog supply may be
generated using the circuit shown in Figure 37. 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.
100
F
ELECT.
0.1
F
CER.
TTL/CMOS
LOGIC
CIRCUITS
3.3V
POWER SUPPLY
FERRITE
BEADS
AVDD
ACOM
10
F–22F
TANT.
02912-B-036
Figure 37. Differential LC Filter for Single 3.3 V Applications
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AD9742ARZRL 功能描述:IC DAC 12BIT 210MSPS 28-SOIC 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):*
AD9742-EB 制造商:Analog Devices 功能描述:EVAL BOARDFOR AD9742 - Bulk
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