參數(shù)資料
型號: LT6350CMS8#PBF
廠商: Linear Technology
文件頁數(shù): 8/28頁
文件大?。?/td> 0K
描述: IC DRIVER DIFF CONVERT/ADC 8MSOP
標準包裝: 50
類型: ADC 驅(qū)動器
應用: 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)
供應商設備封裝: 8-MSOP
包裝: 管件
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
LT6350
16
6350fc
For more information www.linear.com/LT6350
applicaTions inForMaTion
Driving the input signal sufficiently beyond the power
supply rails will cause the input transistors to saturate.
When saturation occurs, the amplifier loses a stage of
phase inversion and the output tries to invert. Diodes D1
and D2 (Figure 5) forward bias and hold the output within
a diode drop of the input signal. With very heavy input
overdrive the output of op amp 1 could invert. To avoid
this inversion, limit the input overdrive to 0.5V beyond
the power supply rails.
OUTPUT VOLTAGE RANGE
The outputs of the LT6350 typically swing to within 55mV
of the upper and lower supply rails when driving a purely
capacitive load such as at the switched-capacitor input
stage of a SAR ADC. The LT6350 can therefore share a
single 5V supply with the SAR ADC and drive a full 8VP-P
differentialaroundaninputcommonmodevoltagebetween
2.055V and 2.945V. A modest negative supply can be
added to allow the LT6350 to swing all the way to 0V in
systems where the ADC requires a true 0V-referenced
signal or when the input common mode range of the ADC
is restricted to be lower than 2.055V. Some SAR ADCs use
2V as the input common mode voltage with a full-scale
input signal range at each input of 0V to 4V. The outputs
of the LT6350 can swing 7.78VP-P differentially around a
2V common mode voltage, which is a loss of only 0.24dB
of the full-scale range of such ADCs.
+–
+IN1
–IN1
V+
V
OUT2
OUT1
SHDN
+IN2
VIN
5V
0.1F
2V
LT6350
6350 F06
+
CCM
RS
RFILT
RS
CDIFF
CCM
+
AIN+
AIN–
ADC
Figure 6. Driving an ADC
INTERFACING THE LT6350 TO A/D CONVERTERS
When driving an ADC, an additional single-pole passive
RC filter added between the outputs of the LT6350 and
the inputs of the ADC can sometimes improve system
performance.ThisisbecausethesamplingprocessofADCs
creates a charge transient at the ADC inputs that is caused
by the switching in of the ADC sampling capacitor. This
momentarily shorts the output of the amplifier as charge is
transferred between amplifier and sampling capacitor. For
anaccuraterepresentationoftheinputsignal,theamplifier
must recover and settle from this load transient before
the acquisition period has ended. An RC network at the
outputsofthedriverhelpsdecouplethesamplingtransient
of the ADC from the amplifier reducing the demands on
the amplifier’s output stage (see Figure 6). The resistors
at the inputs to the ADC minimize the sampling transients
that charge the RC filter capacitors.
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