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參數(shù)資料
| 型號(hào)： | THS1050I |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 10-BIT DELTA-SIGMA ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | POWER, PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 397K |
| 代理商： | THS1050I |
THS1050
10-BIT 50 MSPS IF SAMPLING COMMUNICATIONS
ANALOG-TO-DIGITAL CONVERTER
SLAS278 – APRIL 2000
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
using the analog input
The THS1050 obtains optimum performance when the analog signal inputs are driven differentially. The circuit
below shows the optimum configuration, see Figure 22. The signal is fed to the primary of an RF transformer.
Since the input signal must be biased around the common mode voltage of the internal circuitry, the common
mode (VCM) reference from the THS1050 is connected to the center-tap of the secondary. To ensure a steady
low noise VCM reference, the best performance is obtained when the VCM output is connected to ground with
a 0.1-
F and 0.01-F low inductance capacitor.
R
VIN+
VCM
THS1050
0.01
F
0.1
F
Z0 = 50
1:1
VIN–
50
ac Signal Source
T1-1T
R0
50
Figure 22. Driving the THS1050 Analog Input With Impedance Matched Transmission Line
When it is necessary to buffer or apply a gain to the incoming analog signal, it is also possible to combine a
single-ended amplifier with an RF transformer as shown in Figure 23. For this application, a wide-band current
mode feedback amplifier such as the THS3001 is best. The noninverting input to the op-amps is terminated with
a resistor having an impedance equal to the characteristic impedance of the wave-guide or trace that sources
the IF input signal. The single ended output allows the use of standard passive filters between the amplifier
output and the primary. In this case, the SFDR of the op amp is not as critical as that of the A/D converter. While
harmonics generated from within the A/D converter fold back into the first Nyquist zone, harmonics generated
externally in the op amps can be filtered out with passive filters.
VIN+
VIN–
VCM
THS1050
0.1
F
0.01
F
_
+
BPF
10
1 k
1 k
RT
IF Input
THS3001
Impedance Ratio = 1:n
Figure 23. IF Input Buffered With THS3001 Op-Amp
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