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參數(shù)資料
| 型號(hào)： | LT6350IMS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 6/28頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DIFF CONVERT/ADC DRIVER 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | ADC 驅(qū)動(dòng)器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
| 配用： | DC1783A-H-ND - BOARD SAR ADC LTC2376-18 DC1783A-G-ND - BOARD SAR ADC LTC2377-18 DC1783A-F-ND - BOARD SAR ADC LTC2378-18 DC1783A-E-ND - BOARD SAR ADC LTC2379-18 DC1783A-D-ND - BOARD SAR ADC LTC2376-16 DC1783A-C-ND - BOARD SAR ADC LTC2377-16 DC1783A-B-ND - BOARD SAR ADC LTC2378-16 DC1783A-A-ND - BOARD SAR ADC LTC2380-16 DC1500A-C-ND - BOARD SAR ADC LTC2391-16 DC1500A-B-ND - BOARD SAR ADC LTC2392-16 |
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LT6350
14
6350fc
For more information www.linear.com/LT6350
INPUT AMPLIFIER (OP AMP 1) CHARACTERISTICS
Figure5showsasimplifiedschematicoftheLT6350’sinput
amplifier. The input stage has NPN and PNP differential
pairs operating in parallel. This topology allows the inputs
to swing all the way from the negative supply rail to the
positive supply rail. Both differential pairs are operational
when the common mode voltage is at least 1.3V from
either rail. As the common mode voltage swings higher
than V+ – 1.3V, current source I1 saturates, and current
in PNP differential pair Q1/Q4 drops to zero. Feedback is
maintained through the NPN differential pair Q2/Q3, but
the input stage transconductance, gm, is reduced by a
factor of 2. A similar effect occurs with I2 when the com-
mon mode voltage swings within 1.3V of the negative rail.
A precision, 2-point algorithm is used to maintain near
constant offset voltage over the entire input range (see
Offset Considerations).
Negative input bias current flows into the +IN1 and –IN1
inputs when the input common mode is centered between
the rails. The magnitude of this current increases when
the input common mode voltage is within 1.3V of the
negative rail and only Q1/Q4 are active. The polarity of the
current reverses when the input common mode voltage is
applicaTions inForMaTion
within 1.3V of the positive rail and only Q2/Q3 are active.
Typical total change in input bias current over the entire
input common mode range is approximately 4A. These
changes in input bias current will generate corresponding
changes in voltage across the source and gain-setting
resistors. Because the LT6350 input offset current is less
than the input bias current, matching the effective source
and feedback resistances at the input pins will reduce total
offset errors generated by changes in input bias current
and will keep distortion to a minimum.
INPUT AMPLIFIER (OP AMP 1) FEEDBACK
COMPONENTS
When feedback resistors are used to set gain in op amp 1,
care should be taken to ensure that the pole formed by the
feedbackresistorsandthetotalcapacitanceattheinverting
input, –IN1, does not degrade stability. For instance, to
set the LT6350 in a differential gain of +4, RF and RG of
Figure 3 could be set to 1kΩ. If the total capacitance at
–IN1 (LT6350 plus PC board) were 3pF, a new pole would
be formed in the loop response at 106MHz, which could
lead to ringing in the step response. A capacitor connected
across the feedback resistor and having the same value
DIFFERENTIAL
DRIVE
GENERATOR
+
–
R1
R2
R3
R4
R5
Q2
Q3
Q5
Q6
Q9
Q8
Q7
Q10
Q11
Q1
Q4
I1
I2
D3
D2
D1
DESD2
DESD4
DESD3
DESD1
+IN1
–IN1
DESD5
DESD6
VBIAS
CM
V+
V–
V+
V–
V+
V–
6350 F05
OUT1
Figure 5. Input Amplifier (Op Amp 1) Simplified Schematic
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LT6402-20 | 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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