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參數(shù)資料
| 型號(hào)： | LT6350IMS8#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 4/28頁 |
| 文件大?。?/td> | 462K |
| 代理商： | LT6350IMS8#PBF |
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LT6350
12
6350fb
OPERATION
The LT6350 is a low noise single-ended to differential
converter/ADC driver. It converts a high or low impedance,
single-ended input signal to a low impedance, balanced
differential output suitable for driving high performance
differential sucessive approximation register (SAR) ADCs.
The closed loop –3dB bandwidth for the typical gain-of-two
conguration is 33MHz.
The LT6350 uses a two op amp topology as shown in
the Block Diagram: at the input is one fully uncommitted
op amp with both inputs and output brought out to pins.
This is followed by an op amp internally hardwired and
optimally compensated as a unity-gain inverter with its
input connected to the output of the rst op amp. The
noninverting input of the inverting op amp is brought out to
a pin and is used to set the output common mode voltage
level. The outputs of the two op amps are therefore 180°
out-of-phase and provide a low impedance differential
drive for differential-input analog to digital converters.
The outputs of the LT6350 can swing rail-to-rail and can
source or sink a transient 45mA of current. The outputs
are designed to drive 40pF to ground or 20pF differentially.
Load capacitances larger than 40pF should be decoupled
from each output with at least 25Ω of series resistance.
The LT6350 features very low noise op amps to support
signal-to-noise ratios >110dB.
BASIC CONNECTIONS
A typical use of the LT6350 is to convert a high impedance,
single-ended input signal into a low impedance differential
output. The conguration for such an application is shown
in Figure 2. Here, the input op amp is wired as a non-
inverting buffer with a high input impedance at +IN1. At
the outputs, VOUT1 follows the input, and VOUT2 provides
an inverted copy of VOUT1 for an overall differential gain
of two. The input op amp has a rail-to-rail input stage, and
both outputs are rail-to-rail, typically swinging to within
55mV of the rails at each output in this conguration
allowing 8VP-P differential outputs from a single 5V rail.
This provides a simple interface to differential input ADCs
that accept a mid-rail input common mode voltage.
+
–
+
–
+IN1
–IN1
V+
V–
OUT2
OUT1
SHDN
+IN2
0.5V
5V
4.5V
0.1μF
2.5V
LT6350
6350 F02
+
–
VOUT1
VIN
0.5V-4.5V
VOUT2
0.5V
4.5V
0.5V
4.5V
Figure 2. Basic Connections
DESIGN EQUATIONS AND ALTERNATIVE CONNECTIONS
Because the input op amp presents its output and both
its inputs to LT6350 pins, alternative congurations are
possible. Consider the general conguration shown in
Figure 3.
Ordinary op amp analysis gives the equations for VOUT1
and VOUT2 given the input voltages V1, V2, VIN and VA:
VOUT1 = VIN (1+RF/RG) – V1 (RF/RG)
VOUT1 = VA (1+RF/RG) + V1
VOUT2 = –VOUT1 + 2 V2
If we dene the differential and common mode output
voltages as:
VOUTDIFF ≡ VOUT1 – VOUT2
and
VOUTCM ≡ (VOUT1 + VOUT2)/2,
then combining the expressions for VOUT1 and VOUT2 with
the denitions gives the resulting differential and common
mode output voltages:
VOUTDIFF = 2 (VIN (1+RF/RG)–V1(RF/RG)–V2) (1)
VOUTDIFF = 2 (VA (1+RF/RG) + V1 – V2)
(2)
VOUTCM = V2
(3)
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| LT6350CMS8#TRPBF | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO8 |
| LT6350HDD#PBF | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO8 |
| LT6350HMS8#PBF | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO8 |
| LT6350CDD#PBF | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO8 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT6350IMS8TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise Single-Ended to Differential Converter/ADC Driver |
| LT6360 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:18-Bit, 1.6Msps, Pseudo-Differential Unipolar SAR |
| LT63H-SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| LT63HXX-SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| LT6402-12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
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