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参数资料
| 型号： | THS1240I |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 1-CH 12-BIT DELTA-SIGMA ADC, PARALLEL ACCESS, PQFP48 |
| 封装： | POWER, PLASTIC, TQFP-48 |
| 文件页数： | 2/19页 |
| 文件大小： | 424K |
| 代理商： | THS1240I |
THS1240
12-BIT 40 MSPS IF SAMPLING COMMUNICATIONS
ANALOG-TO-DIGITAL CONVERTER
SLAS279A – JUNE 2000 – REVISED AUGUST 2000
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
using the analog input
The THS1240 obtains optimum performance when the analog signal inputs are driven differentially. The circuit
below shows the optimum configuration, see Figure 12. 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 THS1240 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
THS1240
0.01
F
0.1
F
Z0 = 50
1:1
VIN–
50
AC Signal Source
T1-1T
R0
50
Figure 12. Driving the THS1240 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 13. For this application, a wide-band current
mode feedback amplifier such as the THS3001 is best. The noninverting input to the operational amplifier is
terminated with a resistor having an impedance equal to the characteristic impedance of the 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 operational amplifier 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 operational amplifier can be filtered out with passive filters.
VIN+
VIN–
VCM
THS1240
0.1
F
0.01
F
_
+
BPF
10
1 k
1 k
RT
IF Input
THS3001
Impedance Ratio = 1:n
Figure 13. IF Input Buffered With THS3001 Operational Amplifier
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