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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： | 50/79页 |
| 文件大小： | 2490K |
| 代理商： | DAC5687IPZPG4 |
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IOUT1
4:1
IOUT2
100
100
RLOAD
50
AVDD (3.3 V)
S0033-02
Combined Output Termination
S0069-01
IOUTA1
1:1
RLOAD
50
IOUTA2
AVDD (3.3 V)
IOUTB1
IOUTB2
SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006
Figure 61. Driving a Doubly Terminated 50-
Cable Using a 4:1 Impedance Ratio Transformer
The DAC5687 DAC A and DAC B outputs can be summed together as shown in Figure 62 to provide a 40-mA
full-scale output for increased output power.
Figure 62. Combined Output Termination Using a 1:1 Impedance Ratio Transformer Into 50-
Load
For the case where the digital codes for the two DACs are identical, the termination results in a full-scale swing
of 2 VPP into the 50- load, or 10 dBm. This is 6 dB higher than the 4:1 output termination recommended for a
single DAC output.
There are two methods to produce identical DAC codes. In modes where there is mixing between digital
channels A and B, i.e., when channels A and B are isolated, the identical data can be sent to both input ports to
produce identical DAC codes. Channels A and B are isolated when FMIX is disabled, the QMC is disabled or
enabled with QMC phase register set to 0, and CMIX is disabled or set to fDAC/2. Note that frequency
upconversion is still possible using the high-pass filter setting and CMIX fDAC/2.
Alternatively, by applying the input data on one input port only and setting the other input port to midscale (zero),
the NCO can be used to duplicate the output of the active input channel in the other channel by setting the
frequency to zero, phase to 8192 and NCO_GAIN = 1 and QMC gain = 1446. Assuming I(t) is the wanted signal
and Q(t) = 0, this is demonstrated by the simplification of the NCO equations in the Fine Mixer (FMIX) section:
IOUT(t) = (IIN(t)cos(2π × 0 × t + π/4) – 0 × sin(2π × 0 × t + π/4) × 2
(1 – 1) = I
IN(t)cos(π/4) = IIN(t)/2
54
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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