參數(shù)資料
型號(hào)： LTC2175IUKG-14#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 11/34頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT 125MSPS QUAD 52QFN
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 14
采樣率（每秒）： 125M
數(shù)據(jù)接口： Serial LVDS
轉(zhuǎn)換器數(shù)目： 4
功率耗散（最大）： 646mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 52-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 52-QFN（7x8）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 2 Differential; 2 Single-Ended
配用： DC1371A-ND - BOARD USB DATA ACQUISITION HS
19
21754314fa
LTC2175-14/
LTC2174-14/LTC2173-14
applicaTions inForMaTion
CONVERTER OPERATION
The LTC2175-14/LTC2174-14/LTC2173-14 are low power,
4-channel, 14-bit, 125Msps/105Msps/80Msps A/D con-
verters 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 perfor-
mance,orsingle-endedforlowerpowerconsumption.The
digital outputs are serial LVDS to minimize the number
of data lines. Each channel outputs two bits at a time
(2-lane mode). At lower sampling rates there is a one bit
perchanneloption(1-lanemode).Manyadditionalfeatures
canbechosenbyprogrammingthemodecontrolregisters
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
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 180° phase difference
between the inputs.
Thefourchannelsaresimultaneouslysampledbyashared
encode circuit (Figure 2).
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC low pass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitryfromtheA/Dsample-and-holdswitching,andalso
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 application’s input
frequency.
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
Figure 2. Equivalent Input Circuit. Only One of the Four
Analog Channels is Shown.
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2175-14
AIN+
217514 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC–
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz.
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2175-14
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
217514 F03
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