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参数资料
| 型号： | DAC5687IPZPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 0.0104 us SETTLING TIME, 16-BIT DAC, PQFP100 |
| 封装： | GREEN, PLASTIC, HTQFP-100 |
| 文件页数： | 57/79页 |
| 文件大小： | 2490K |
| 代理商： | DAC5687IPZPG4 |
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Location of the Spurious Signals
fSIG/fDAC
0.5
0.4
0.3
0.2
0.1
0.0
0.1
0.2
0.3
0.4
0.5
0.0
0.1
0.2
0.3
0.4
0.5
Spurious
Frequency/f
D
A
C
G026
fSIG
fSIG fDAC/2
(a) Complex Output in X2 Mode
(b) Real Output in X2 Mode
fSIG/fDAC
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.0
0.1
0.2
0.3
0.4
0.5
Spurious
Frequency/f
D
A
C
G027
fSIG
fSIG fDAC/2
SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006
To calculate the nonharmonic clock-related spurious signals for a particular condition, we first determine the
location of the spurious signals and then the amplitude.
The location of the spurious signals is determined by the DAC5687 output frequency (fSIG) and whether the
output is used as a dual-output complex signal to be fed to an analog quadrature modulator (AQM) or as a real
IF signal from a single DAC output.
Figure 70 shows the location of spurious signals for X2 mode as a function of fSIG/fDAC. For complex outputs, the
spurious frequencies cover a range of –0.5
× f
DAC to 0.5 × fDAC, with the negative complex frequency indicating
that the spurious signal falls in the opposite sideband from the wanted signal at the output of the AQM. For the
real output, the phase information for the spurious signal is lost, and therefore what was a negative frequency for
the complex output is a positive frequency for a real output.
For the X2 mode, there is one spurious frequency with an absolute frequency less than 0.5
× f
DAC. For a complex
output in X2 mode, the spurious signal always is offset fDAC/2 from the wanted signal at fSIG – fDAC/2. For a real
output, as fSIG approaches fDAC/4, the spurious signal frequency falls at fDAC/2 – fSIG, which also approaches
fDAC/4.
Figure 70. Frequency of Clock Mixing Spurious Images in X2 Mode
Figure 71 shows the location of spurious signals for X4 and X4L mode as a function of fSIG/fDAC. The addition of
the fDAC/4 clock frequency for the first interpolation filter creates three new spurious signals. For a complex
output, the nearest spurious signals are fDAC/4 offset from fSIG. For a real output, the signal due to fSIG – fDAC/4
and fSIG – fDAC × 3/4 falls in band as fSIG approaches fDAC/8 and fDAC × 3/8. This creates optimum real output
frequencies fSIG = fDAC × N/16 (N = 1, 3, 5, and 7), where the minimum spurious product offset from fSIG is fDAC/8.
60
Copyright 2005–2006, Texas Instruments Incorporated
Product Folder Link(s): DAC5687
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相关代理商/技术参数 |
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| DAC5687IPZPR | 功能描述:数模转换器- DAC 16-bit 500 MSPS 2-8x Interpolat’g Dual-Ch 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 |
| DAC5687IPZPRG4 | 功能描述:数模转换器- DAC 16-bit 500 MSPS 2-8x Interpolat’g Dual-Ch 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 |
| DAC5687MPZPEP | 功能描述:数模转换器- DAC 16B 500Msps 2X-8X Interp 2-Channel DAC 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 |
| DAC5688 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-CHANNEL, 16-BIT, 800 MSPS, 2x-8x INTERPOLATING DIGITAL-TO-ANALOG CONVERTER (DAC) |
| DAC5688_10 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-CHANNEL, 16-BIT, 800 MSPS, 2x-8x INTERPOLATING DIGITAL-TO-ANALOG CONVERTER (DAC) |
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