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: 49/79页
文件大小: 2490K
代理商: DAC5687IPZPG4
www.ti.com
IOUT1
IOUT2
S(1)
S(1)C
RLOAD
S(2)
S(2)C
S(N)
S(N)C
AVDD
S0032-01
IOUT1
1:1
IOUT2
50
50
RLOAD
50
100
AVDD (3.3 V)
S0033-01
SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006
Figure 59. Equivalent Analog Current Output
The DAC5687 can be easily configured to drive a doubly terminated 50-
cable using a properly selected RF
transformer. Figure 60 and Figure 61 show the 50-
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-
Cable Using a 1:1 Impedance Ratio Transformer
Copyright 2005–2006, Texas Instruments Incorporated
53
Product Folder Link(s): DAC5687
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