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参数资料
| 型号： | LTC2272IUJ#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC40 |
| 封装： | 6 X 6 MM, PLASTIC, QFN-40 |
| 文件页数： | 29/44页 |
| 文件大小： | 767K |
| 代理商： | LTC2272IUJ#TR |
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LTC2273/LTC2272
35
22732fa
APPLICATIONS INFORMATION
High Speed CML Outputs
The CML outputs must be terminated for proper opera-
tion. The OVDD supply voltage and the termination voltage
determine the common mode output level of the CML
outputs. For proper operation of the CML driver, the output
common mode voltage should be greater than 1V.
The directly-coupled termination mode of Figure 19a is
recommended when the receiver termination voltage is
within the range of 1.2V to 3.3V. When the CML outputs
are directly-coupled to the 50Ω termination resistors, the
OVDD supply voltage serves as the receiver termination
voltage, and the output common mode voltage will be
approximately 200mV lower than OVDD.
The directly-coupled differential termination of Figure 19b
may be used in the absence of a receiver termination voltage
within the required range. In this case, the common mode
voltage is shifted down to approximately 400mV below
OVDD, requiring an OVDD in the range of 1.4V to 3.3V.
If the serial receiver’s common mode input requirements
are not compatible with the directly-coupled termination
modes, the DC balanced 8B/10B encoded data will permit
the addition of DC blocking capacitors as shown in Figure
19c. In this AC-coupled mode, the termination voltage is
determined by the receiver’s requirements. The coupling
capacitors should be selected appropriately for the intended
operating bit-rate, usually between 1nF to 10nF. In the AC-
coupled mode, the output common mode voltage will be
approximately 400mV below OVDD, so the OVDD supply
voltage should be in the range of 1.4V to 3.3V.
Grounding and Bypassing
The LTC2273/LTC2272 require a printed circuit board with a
clean unbroken ground plane; a multilayer board with an
internal ground plane is recommended. The pinout of the
LTC2273/LTC2272 have been optimized for a owthrough
layout so that the interaction between inputs and digital
outputs is minimized. Layout for the printed circuit board
should ensure that digital and analog signal lines are
separated as much as possible. In particular, care should
be taken not to run any digital track alongside an analog
signal track or underneath the ADC.
High quality ceramic bypass capacitors should be used
at the VDD, VCM, and OVDD pins. Bypass capacitors must
be located as close to the pins as possible. The traces
connecting the pins and bypass capacitors must be kept
short and should be made as wide as possible.
The LTC2273/LTC2272 differential inputs should run
parallel and close to each other. The input traces should
be as short as possible to minimize capacitance and to
minimize noise pickup.
Heat Transfer
Most of the heat generated by the LTC2273/LTC2272 are
transferred from the die through the bottom-side exposed
pad. For good electrical and thermal performance, the
exposed pad must be soldered to a large grounded pad
on the PC board. It is critical that the exposed pad and all
ground pins are connected to a ground plane of sufcient
area with as many vias as possible.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC2273IUJ#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC40 |
| LTC2273IUJ | 1-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC40 |
| LTC2274CUJ#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC40 |
| LTC2274CUJ | 1-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC40 |
| LTC2274IUJ#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQCC40 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2272IUJ-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Serial Output ADC |
| LTC2272UJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Serial Output ADC |
| LTC2273 | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Serial Output ADC |
| LTC2273CUJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 80Msps/65Msps Serial Output ADC |
| LTC2273CUJ#PBF | 制造商:Linear Technology 功能描述:IC ADC 16BIT 80MSPS 40-QFN 制造商:Linear Technology 功能描述:IC ADC 16BIT 80MSPS QFN-40 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 80MSPS, QFN-40, Resolution (Bits):16bit, Sampling Rate:80MSPS, Supply Voltage Type:Single, Supply Voltage Min:3.135V, Supply Voltage Max:3.465V, Supply Current:233mA, Digital IC Case Style:QFN, No. of Pins:40 , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:MS-ADC/High Speed, 16-bit, 80Msps Serial ADC |
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