參數(shù)資料
型號(hào): LTM9011CY-14#PBF
廠商: Linear Technology
文件頁數(shù): 15/40頁
文件大?。?/td> 0K
描述: IC ADC 14BIT UMODULE 140BGA
標(biāo)準(zhǔn)包裝: 210
系列: µModule®
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: 8
功率耗散(最大): 1.33W
電壓電源: 模擬和數(shù)字
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 140-BFBGA
供應(yīng)商設(shè)備封裝: 140-BGA(11.25x9)
包裝: 托盤
輸入數(shù)目和類型: 8 Differential; 8 Single-Ended
LTM9011-14/
LTM9010-14/LTM9009-14
22
9009101114fa
applicaTions inForMaTion
CONVERTER OPERATION
The LTM9011-14/LTM9010-14/LTM9009-14 are low
power,8-channel,14-bit,125Msps/105Msps/80MspsA/D
converters 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(Figure2).Theinputsshouldbedrivendifferentially
around a common mode voltage set by the appropriate
VCM 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.
Theeightchannelsaresimultaneouslysampledbyashared
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
tap is biased with VCM, setting the A/D input at its opti-
mal DC level. At higher input frequencies a transmission
line balun transformer (Figures 4 to 6) has better balance,
resulting in lower A/D distortion.
Figure 2. Equivalent Input Circuit. Only One
of the Eight Analog Channels Is Shown
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTM9011-14
AIN+
9009101114 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
LTM9011-14
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
9009101114 F03
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