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參數資料
| 型號： | THS14F03IPFBG4 |
| 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： | GREEN, PLASTIC, TQFP-48 |
| 文件頁數： | 10/24頁 |
| 文件大小： | 329K |
| 代理商： | THS14F03IPFBG4 |
THS14F01, THS14F03
14-BIT, 1 MSPS/ 3 MSPS, DSP COMPATIBLE, ANALOG-TO-DIGITAL CONVERTERS
WITH FIFO INTERNAL REFERENCE AND PGA
SLAS285 – JUNE 2000
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
fully differential configuration
In this configuration, the ADC converts the difference (
IN) of the two input signals on IN+ and IN–.
100 pF
IN+
IN–
THS14F01/3
22
100 pF
22
Figure 16. Differential Input
The resistors and capacitors on the inputs decouple the driving source output from the ADC input and also serve
as first order low pass filters to attenuate out of band noise.
The input range on both inputs is 0 V to AVDD. The full-scale value is determined by the voltage reference. The
positive full-scale output is reached, if
IN equals REF, the negative full-scale output is reached, if IN equals
–
REF.
IN [V]
OUTPUT
–
REF
– full scale
0
REF
+ full scale
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–
THS14F01/3
CML
R
100 pF
22
22
+
1
F
0.1
F
Figure 17. Transformer Coupled
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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