參數(shù)資料
型號： LTC2172IUKG-12#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 4-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52
封裝： 7 X 8 MM, LEAD FREE, PLASTIC, QFN-52
文件頁數(shù)： 13/34頁
文件大小： 1304K
代理商： LTC2172IUKG-12#TRPBF
LTC2172-12/
LTC2171-12/LTC2170-12
20
21721012fb
CONVERTER OPERATION
TheLTC2172-12/LTC2171-12/LTC2170-12arelowpower,
4-channel, 12-bit, 65Msps/40Msps/25Msps A/D convert-
ers that are powered by a single 1.8V supply. The analog
inputs should be driven differentially. The encode input
can be driven differentially for optimal jitter performance,
or single-ended for lower power consumption. The digital
outputs are serial LVDS to minimize the number of data
lines. Each channel outputs two bits at a time (2-lane
mode) or one bit at a time (1-lane mode). Many additional
features can be chosen by programming the mode control
registers through a serial SPI port.
ANALOG INPUT
The analog inputs are differential CMOS sample-and-hold
circuits (Figure 2). The inputs should be driven differen-
tially around a common mode voltage set by the VCM12
applicaTions inForMaTion
or VCM34 output pins, which are nominally VDD/2. For the
2V input range, the inputs should swing from VCM – 0.5V
to VCM + 0.5V. There should be a 180° phase difference
between the inputs.
The four channels are simultaneously sampled by a
shared encode circuit (Figure 2).
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC lowpass filter right
at the analog inputs. This lowpass filter isolates the
drive circuitry from the A/D sample-and-hold switch-
ing and limits wideband noise from the drive circuitry.
Figure 3 shows an example of an input RC filter. The RC
component values should be chosen based on the ap-
plication’s input frequency.
Figure 2. Equivalent Input Circuit. Only One of
the Four Analog Channels Is Shown.
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2172-12
AIN+
217212 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC–
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2172-12
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
217212 F03
相關PDF資料
PDF描述
LTC2171IUKG-12#PBF 4-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52
LTC2172CUKG-12#TRPBF 4-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52
LTC2172CUKG-14#PBF 4-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52
LTC2172IUKG-14#TRPBF 4-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52
LTC2170CUKG-14#PBF 4-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC52
相關代理商/技術參數(shù)
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