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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DAC5687IPZP датащи(PDF) 53 Page - Texas Instruments |
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DAC5687IPZP датащи(HTML) 53 Page - Texas Instruments |
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53 / 79 page  www.ti.com IOUT1 IOUT2 S(1) S(1)C RLOAD RLOAD S(2) S(2)C S(N) S(N)C AVDD S0032-01 IOUT1 1:1 IOUT2 50 Ω 50 Ω RLOAD 50 Ω 100 Ω AVDD (3.3 V) AVDD (3.3 V) S0033-01 DAC5687 SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006 Figure 59. Equivalent Analog Current Output The DAC5687 can be easily configured to drive a doubly terminated 50- Ω cable using a properly selected RF transformer. Figure 60 and Figure 61 show the 50- Ω doubly terminated transformer configuration with 1:1 and 4:1 impedance ratio, respectively. Note that the center tap of the primary input of the transformer must be connected to AVDD to enable a dc current flow. Applying a 20-mA full-scale output current would lead to a 0.5-VPP output for a 1:1 transformer and a 1-VPP output for a 4:1 transformer. The low dc impedance between the IOUT1 or IOUT2 and the transformer center tap sets the center of the ac signal at AVDD, so the 1-VPP output for the 4:1 transformer results in an output between AVDD + 0.5 V and AVDD – 0.5 V. Figure 60. Driving a Doubly Terminated 50- Ω Cable Using a 1:1 Impedance Ratio Transformer Copyright © 2005–2006, Texas Instruments Incorporated Submit Documentation Feedback 53 Product Folder Link(s): DAC5687 |
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