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參數(shù)資料
| 型號(hào)： | THS1240I |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT DELTA-SIGMA ADC, PARALLEL ACCESS, PQFP48 |
| 封裝： | POWER, PLASTIC, TQFP-48 |
| 文件頁(yè)數(shù)： | 2/19頁(yè) |
| 文件大?。?/td> | 424K |
| 代理商： | THS1240I |
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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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| THS1240IPHP | 功能描述:IC 12 BIT ADC 40 MSPS 48-HTQFP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤(pán)（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| THS125 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:HIGH STABILITY MOTOR CONTROL. DIGITAL TACHOMETER. CRANK SHAFT POSITION SENSOR. |
| THS126 | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:HIGH STABILITY MOTOR CONTROL. DIGITAL TACHOMETER. CRANK SHAFT POSITION SENSOR. |
| THS126(F) | 制造商:Toshiba 功能描述:Cut Tape |
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