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| 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： | 68/79页 |
| 文件大小： | 2490K |
| 代理商： | DAC5687IPZPG4 |
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Application Example: CMTS/VOD Transmitter
B0044-01
y2
DAC
Ch2
Ch1
GC5016
DUC
DAC5687
CDC7005
y2
DUC
DAC
QAM1
QAM2
QAM3
QAM4
SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006
The exceptional SNR of the DAC5687 enables a dual-cable modem termination system (CMTS) or video on
demand (VOD) QAM transmitter in excess of the stringent DOCSIS specification, with > 74 dBc and 75 dBc in
the adjacent and alternate channels.
A typical system using the DAC5687 for a cost-optimized dual-channel two-QAM transmitter is shown in
Figure 81. A GC5016 would take four separate symbol rate inputs and provide pulse shaping and interpolation to
~128 MSPS. The four QAM carriers would be combined into two groups of two QAM carriers with intermediate
frequencies of approximately 30 MHz to 40 MHz. The GC5016 would output two real data streams to one
DAC5687. The DAC5687 would function as a dual-channel device and provide 2
× interpolation to increase the
frequency of the second Nyquist zone image. The two signals are then output through the two DAC outputs,
through a transformer and to an RF upconverter.
Figure 81. Dual-Channel Two-QAM CMTS Transmitter System Using DAC5687
The DAC5687 output for a two-QAM256 carrier signal at 33-MHz and 39-MHz IF with the signal and system
properties listed in Table 19 is shown in Figure 82. The low DAC5687 noise floor provides better than 75 dBc
(equal bandwidth normalized to one QAM256 power) at > 6-MHz offset.
Table 19. Signal and System Properties for Complex IF System Example in Figure 82
Signal
QAM256, 5.36 MSPS,
α = 0.12
IF frequencies
33 MHz and 39 MHz
DAC5687 input rate
5.36 MSPS
× 24 = 128.64 MSPS
DAC5687 output rate
257.28 MSPS (2
× interpolation)
DAC5687 mode
X2
70
Copyright 2005–2006, Texas Instruments Incorporated
Product Folder Link(s): DAC5687
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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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