參數(shù)資料
型號: THS1401QPFB
廠商: TEXAS INSTRUMENTS INC
元件分類: ADC
英文描述: 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48
封裝: PLASTIC, TQFP-48
文件頁數(shù): 10/30頁
文件大?。?/td> 475K
代理商: THS1401QPFB
THS1401, THS1403, THS1408
14-BIT, 1/3/8 MSPS DSP COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS
WITH INTERNAL REFERENCE AND PGA
SLAS248B – DECEMBER 1999 – REVISED JANUARY 2001
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
transformer coupled single-ended to differential configuration
If the application requires the best SNR, SFDR, and THD performance, the input should be transformer coupled.
The signal amplitude on both inputs of the ADC is one half as high as in a single-ended configuration thus
increasing the ADC ac performance.
100 pF
IN+
IN–
THS1401/3/8
CML
R
100 pF
22
22
+
1
F
0.1
F
Figure 20. Transformer Coupled
The following table shows the input voltages for negative full-scale output, zero output, and positive full-scale
output:
IN [VPEAK]
OUTPUT [PEAK]
REF
– full scale
0
REF
+ full scale
n = 1 (winding ratio)
The resistor R of the transformer coupled input configuration must be set to match the signal source impedance
R = n2 Rs, where Rs is the source impedance and n is the transformer winding ratio.
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