参数资料
型号: THS5651IPWR
厂商: TEXAS INSTRUMENTS INC
元件分类: DAC
英文描述: PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 10-BIT DAC, PDSO28
封装: PLASTIC, TSSOP-28
文件页数: 10/29页
文件大小: 725K
代理商: THS5651IPWR
THS5651
10-BIT, 100 MSPS, CommsDAC
DIGITAL-TO-ANALOG CONVERTER
SLAS197A – JUNE 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
IOUT2
IOUT1
IOUT2
IOUT1
VOUT
100
+
RFB
+)
–)
VOUT
+)
–)
50
(a)
(b)
50
CFB
THS4001
THS4011
Figure 24. Differential and Single-Ended Output Configuration
The THS5651 can be easily configured to drive a doubly terminated 50
cable. Figure 25(a) shows the
single-ended output configuration, where the output current IOUT1 flows into an equivalent load resistance of
25
. Node IOUT2 should be connected to ground or terminated with a resistor of 25 . Differential-to-single
conversion (e.g., for measurement purposes) can be performed using a properly selected RF transformer, as
shown in Figure 25(b). This configuration provides maximum rejection of common-mode noise sources and
even order distortion components, thereby doubling the power to the output. The center tap on the primary side
of the transformer is connected to AGND, enabling a dc current flow for both IOUT1 and IOUT2. Note that the
ac performance of the THS5651 is optimum and specified using this differential transformer coupled output,
limiting the voltage swing at IOUT1 and IOUT2 to
±0.5 V.
IOUT2
IOUT1
VOUT
IOUT2
IOUT1
VOUT
50
100
(a)
(b)
25
50
50
50
50
1:1
Figure 25. Driving a Doubly Terminated 50
Cable
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