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參數資料
| 型號： | LTC2156IUP-14#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| 封裝： | 9 X 9 MM, LEAD FREE, PLASTIC, MO-220WNJR-5, QFN-64 |
| 文件頁數： | 9/32頁 |
| 文件大小： | 647K |
| 代理商： | LTC2156IUP-14#TRPBF |
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17
21576514f
LTC2157-14/
LTC2156-14/LTC2155-14
CONVERTER OPERATION
The LTC2157-14/LTC2156-14/LTC2155-14 are two-
channel, 14-bit 250Msps/210Msps/170Msps A/D con-
verters that are powered by a single 1.8V supply. The
analog inputs must be driven differentially. The en-
code inputs should be driven differentially for optimal
performance. The digital outputs are double data rate
LVDS. 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 must be driven dif-
ferentially around a common mode voltage set by the
VCM output pin, which is nominally 0.8V. For the 1.5V
input range, the inputs should swing from VCM – 0.375V
to VCM + 0.375V. There should be 180° phase difference
between the inputs.
The two channels are simultaneously sampled by a
shared encode circuit.
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 switching, and also
limits wide band noise from the drive circuitry. Figure 3
shows an example of an input RC filter. The RC compo-
nent values should be chosen based on the application’s
specific input frequency.
Transformer-Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with the common mode supplied through a
pair of resistors via the VCM pin.
At higher input frequencies a transmission line balun
transformer (Figures 4 and 5) has better balance, resulting
in lower A/D distortion.
2pF
RON
20Ω
RON
20Ω
VDD
LTC2157-14
AIN
+
21576514 F02
2pF
VDD
AIN
–
ENC–
ENC+
2pF
1.2V
10k
25Ω
4.7Ω
10Ω
0.1μF
10pF
0.1μF
LTC2157-14
IN
0.1μF
T1: MACOM ETC1-1T
21576514 F03
AIN
+
AIN
–
VCM
Figure 2. Equivalent Input Circuit. Only One
of Two Analog Channels Is Shown
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
APPLICATIONS INFORMATION
Figure 4. Recommended Front-End Circuit for
Input Frequencies from 15MHz to 150MHz
45Ω
10Ω
4.7Ω
0.1μF
100Ω
IN
0.1μF
T1: MABA
007159-000000
T2: WBC1-1L
21576514 F04
LTC2157-14
AIN
+
AIN
–
VCM
相關PDF資料 |
PDF描述 |
|---|---|
| LTC2156CUP-14#PBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2157IUP-14#TRPBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2155IUP-14#PBF | 2-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2160CUK#TRPBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC2157-12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 14-Bit 250Msps |
| LTC2157-14 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 14-Bit 250Msps |
| LTC2157CUP-12 | 制造商:Linear Technology 功能描述:ADC DUAL 12BIT 250M 64QFN 制造商:Linear Technology 功能描述:ADC, DUAL, 12BIT, 250M, 64QFN |
| LTC2157CUP-12#PBF | 功能描述:IC ADC DUAL 12BIT 250M 64-QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 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 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC2157CUP-12#TRPBF | 制造商:Linear Technology 功能描述:ADC Dual Pipelined 250Msps 12-bit Parallel/Serial (SPI)/LVDS 64-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC ADC DUAL 12BIT 250M 64-QFN |
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