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參數(shù)資料
| 型號(hào)： | LTC6403CUD-1#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP/DRIVER LN LP 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 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
LTC6403-1
14
64031fa
APPLICATIONS INFORMATION
Input Common Mode Voltage Range
The LTC6403-1’s input common mode voltage (VICM) is
dened as the average of the two input voltages, V+IN, and
V–IN. It extends from V– to 1.4V below V+.
For fully differential input applications, where VINP = –VINM,
the input common mode voltage is approximately (Refer
to Figure 5):
V
VV
V
R
RR
V
R
ICM
IN
VOCM
I
IF
CM
F
=
+
≈
+
+
–
2
FFI
R
+
With singled ended inputs, there is an input signal com-
ponent to the input common mode voltage. Applying only
VINP (setting VINM to zero), the input common voltage is
approximately:
V
VV
V
R
RR
V
R
ICM
IN
VOCM
I
IF
CM
F
=
+
≈
+
+
–
2
FFI
INP
F
FI
R
VR
RR
+
+
2
Output Common Mode Voltage Range
The output common mode voltage is dened as the aver-
age of the two outputs:
VV
OUTCM
VOCM
OUT
==
+
–
2
The VOCM pin sets this average by an internal common
mode feedback loop. The output common mode range
extends from 1.1V above V– to 1V below V+. The VOCM
pin sits in the middle of an internal voltage divider which
sets the default mid-supply open circuit potential.
In single supply applications, where the LTC6403-1 is
used to interface to an ADC, the optimal common mode
input range to the ADC is often determined by the ADC’s
reference. If the ADC makes a reference available for set-
ting the input common mode voltage, it can be directly
tied to the VOCM pin, but must be capable of driving the
input impedance presented by the VOCM as listed in the
Electrical Characteristics Table. This impedance can be
assumed to be connected to a mid-supply potential. If an
external reference drives the VOCM pin, it should still be
bypassed with a high quality 0.01μF or higher capacitor to
a low impedance ground plane to lter any thermal noise
and to prevent common mode signals on this pin from
being inadvertently converted to differential signals.
Output Filter Considerations and Use
Filtering at the output of the LTC6403-1 is often desired
to provide either anti-aliasing or improved signal to noise
ratio. To simplify this ltering, the LTC6403-1 includes an
additional pair of differential outputs (+OUTF and –OUTF)
which incorporate an internal lowpass lter network with
a –3dB bandwidth of 44.2MHz (Figure 6).
Figure 4. Optimal Compensation for Signal Source Impedance
Figure 5. Circuit for Common Mode Range
VS
+
–
+
RF
RI
RINM
VOCM
RS
RI
R2 = RS || R1
R1 CHOSEN SO THAT R1 || RINM = RS
R2 CHOSEN TO BALANCE RS || R1
R1
64031 F04
V–
V+
0.1
μF
0.1
μF
0.1
μF
0.1
μF
0.1
μF
VCM
–
+
1
SHDN
5
6
–IN
7
+OUT
8
+OUTF
16
15
+IN
NC
14
–OUT
13
–OUTF
V–OUTF
RF
V+OUTF
V–OUT
V+OUT
2
V+
3
V–
V+
V–
V+
V–
4
VOCM
VSHDN
VVOCM
VOCM
12
V–
11
V+
10
V+
9
V–
64031 F05
LTC6403-1
SHDN
0.1
μF
0.01
μF
RF
RI
+
–
VINP
–
+
VINM
V–IN
V+IN
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