RF V
參數(shù)資料
型號(hào)： LTC6405IUD#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 9/26頁(yè)
文件大小： 0K
描述： IC DIFF AMP/DRIVER R-R 16-QFN
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： 16-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 16-QFN-EP（3x3）
包裝： 帶卷 (TR)
LTC6405
17
6405fb
For more information www.linear.com/6405
–
+
RF
V–OUT
V+OUT
VVOCM
VOCM
6405 F05
RF
RI
+
–
VINP
+
–
VCM
–
+
VINM
V–IN
V+IN
applications inForMation
Input Common Mode Voltage Range
The LTC6405’s input common mode voltage (VICM) is
defined as the average of the two input voltages, V+IN, and
V–IN. At the inputs to the actual op amp, the range extends
from V– to V+. This makes it easy to interface to a wide
rangeofcommonmodesignals,fromgroundreferencedto
VCCreferencedsignals.Moreover,duetoexternalresistive
divideractionofthegainandfeedbackresistors,theeffective
range of signals that can be processed is even wider. The
input common mode range at the op amp inputs depends
on the circuit configuration (gain), VOCM and VCM (refer to
Figure 5). For fully differential input applications, where
VINP = –VINM, the common mode input is approximately:
VICM =
V+IN + V–IN
2
≈ VOCM
RI
RI +RF
+
VCM
RF
RF +RI
Figure 5. Circuit for Common Mode Range
Manipulating the Rail-to-Rail Input Stage with VTIP
Toachieverail-to-railinputoperation,theLTC6405features
anNPNinputstageinparallelwithaPNPinputstage.When
the input common mode voltage is near V+, the NPNs are
active while the PNPs are off. When the input common
mode is near V–, the PNPs are active while the NPNs are
off. At some range in the middle, both input stages are
active. This ‘hand-off’ operation happens automatically.
In the QFN package, a special pin, VTIP, is made available
that can be used to manipulate the ‘hand-off’ operation
between the NPN and PNP input stages. By default, the
VTIP pin is internally biased by an internal resistive divider
between the supplies, developing a default 2.8V voltage
with a 5V supply. If desired, VTIP can be over-driven by
an external voltage (the Thevenin equivalent resistance is
approximately 17k).
If VTIP is pulled closer to V–, the range over which the NPN
input pair remains active is increased, while the range over
which the PNP input pair is active is reduced. In applica-
tions where the input common mode does not come close
to V– , this mode can be used to further improve linearity
beyond the specified performance (see Figure 6).
If VTIP is pulled closer to V+, the range over which the PNP
input pair remains active is increased, while the range over
which the NPN input pair is active is reduced. In applica-
tions where the input common mode does not come close
to V+, this mode can be used to further improve linearity
beyond the specified performance.
With single ended inputs, there is an input signal compo-
nent to the input common mode voltage. Applying only
VINP (setting VINM to zero), the input common voltage is
approximately:
VICM =
V+IN + V–IN
2
≈ VOCM
RI
RI +RF
+
VCM
RF
RF +RI
+
VINP
2
RF
RF +RI
Use the equations above to check that the VICM at the op
amp inputs is within range (V– to V+).
Figure 6. Manipulating VTIP to Improve Harmonic Distortion
HD2
VTIP = OPEN
HD3
VTIP = OPEN
FREQUENCY (MHz)
6405 F06
DISTOR
TION
(dBc)
VS = 5V
VOCM=VICM= 2.5V
RLOAD = 800
RI = RF = 499
VOUTDIFF = 2VP-P
SINGLE-ENDED INPUT
QFN PACKAGE
–30
–40
–50
–60
–70
–80
–90
–110
–100
1
100
10
HD3
VTIP=1V
HD2
VTIP=1V
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