参数资料
| 型号： | DAC5674IPHPRG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 14/39页 |
| 文件大小： | 0K |
| 描述： | IC DAC 14BIT 400MSPS 48-HTQFP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 1,000 |
| 系列： | CommsDAC™ |
| 设置时间： | 20ns |
| 位数： | 14 |
| 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）： | 550mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP 裸露焊盘 |
| 供应商设备封装： | 48-HTQFP（7x7） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 2 电流，单极 |
| 采样率（每秒）： | 400M |
| 配用： | 296-30860-ND - EVAL MODULE FOR DAC5674 |
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DAC5674
SLWS148A SEPTEMBER 2003 REVISED OCTOBER 2005
www.ti.com
21
PFD
ref
ICO
Fref
Fvco
LPF
R
C1
C2
DAC5674
External Loop Filter
PN
Figure 22. PLL Functional Block Diagram
Table 5. DAC5674 Evaluation Board PLL Loop Filter Parameters
N(1)
PHASE MARGIN (DEGREES)
BANDWIDTH (MHZ)
2
60
1.6
4
71
1.4
8
77
1
16
78
0.7
32
74
0.4
(1) N is the VCO divide-down factor from prescale and interpolation.
Non-Harmonic Clock-Related Spurious Signals
In interpolating DACs, imperfect isolation between the digital and DAC clock circuits generates spurious signals
at frequencies related to the DAC clock rate. The digital interpolation filters in these DACs run at subharmonic
frequencies of the output rate clock, where these frequencies are fDAC/2 , N = 1,2. For example, for 2×
interpolation only one interpolation filter runs at fDAC/2; for 4× interpolation, on the other hand, two interpolation
filters run at fDAC/2 and fDAC/4. These lower-speed clocks for the interpolation filter mix with the DAC clock
circuit and create spurious images of the wanted signal and second Nyquist-zone image at offsets of fDAC/2N.
Figure 23 shows the location of the largest spurious signals for 4
× interpolation for a real signal. With a real
output signal, there is no distinction between negative and positive frequencies, and therefore the signals that
appear at negative frequencies wrap and potentially fall near the wanted signal. In particular, at IFs near fDAC/8,
fDAC/4, and fDAC × 3/4 (50 MHz, 100 MHz, and 150 MHz in this example), the mixing effect results in spurious
signals falling near the wanted signal, which may present a problem depending on the system application. For
a frequency-symmetric signal (such as a single WCDMA or CDMA carrier), operating at exactly fDAC/8, fDAC/4
and fDAC × 3/4, the spurious signal falls completely inside the wanted signal, which produces a clean spectrum
but may result in degradation of the signal quality.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DAC5675 | 制造商:TI 制造商全称:Texas Instruments 功能描述:14-BIT, 400-MSPS DIGITAL-TO-ANALOG CONVERTER |
| DAC5675A | 制造商:TI 制造商全称:Texas Instruments 功能描述:14-Bit, 400MSPS Digital-to-Analog Converter |
| DAC5675AEVM | 功能描述:数据转换 IC 开发工具 DAC5675A Eval Mod RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| DAC5675AIPHP | 功能描述:数模转换器- DAC 14-Bit 400-MSPS RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC5675AIPHP | 制造商:Texas Instruments 功能描述:IC DAC 14BIT 400MSPS 48-HTQFP |
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