參數(shù)資料
型號(hào): ADS62P45IRGCR
廠商: Texas Instruments
文件頁(yè)數(shù): 46/78頁(yè)
文件大小: 0K
描述: IC ADC 14BIT SER/PAR 125M 64VQFN
產(chǎn)品培訓(xùn)模塊: Data Converter Basics
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 14
采樣率(每秒): 125M
數(shù)據(jù)接口: 串行,并聯(lián)
轉(zhuǎn)換器數(shù)目: 2
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 64-VQFN 裸露焊盤(pán)(9x9)
包裝: 帶卷 (TR)
輸入數(shù)目和類(lèi)型: 2 個(gè)差分,單極
INP
INM
VCM
1:1
50 W
0.1 F
m
0.1 F
m
S0164-05
ADS62P4x
R
G
R
F
R
F
R
FIL
R
FIL
C
FIL
C
FIL
R
G
0.1 F
m
0.1 F
m
0.1 F
m
0.1 F
m
0.1 F
m
0.1 F
m
0.1 F
m
10 F
m
10 F
m
R
S
R
S
T
||R
R
T
+V
S
CM
INP
INM
ADS62P4x
THS4509
VCM
500 W
200 W
5 W
500 W
0.1 F
m
–V
S
S0259-02
SLAS561C
– JULY 2007 – REVISED FEBRUARY 2012
Figure 87. Drive Circuit at High Input Frequencies
Using Differential Amplifier Drive Circuits
Figure 88 shows a drive circuit using a differential amplifier (TI's THS4509) to convert a single-ended input to
differential output that can be interface to the ADC analog input pins. In addition to the single-ended to differential
conversion, the amplifier also provides gain (10 dB). RFIL helps to isolate the amplifier outputs from the switching
input of the ADC. Together with CFIL it also forms a low-pass filter that band-limits the noise (and signal) at the
ADC input. As the amplifier output is ac-coupled, the common-mode voltage of the ADC input pins is set using
two 200-
resistors connected to VCM.
The amplifier output can also be dc-coupled. Using the output common-mode control of the THS4509, the ADC
input pins can be biased to 1.5 V. In this case, use +4-V and
–1-V supplies for the THS4509 so that its output
common-mode voltage (1.5 V) is at mid-supply.
Figure 88. Drive Circuit Using the THS4509
50
Copyright
2007–2012, Texas Instruments Incorporated
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