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參數(shù)資料
| 型號： | LTC6409IUDB#TRMPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP/DRIVER DIFF GBW 10-QFN |
| 標準包裝： | 500 |
| 類型： | ADC 驅(qū)動器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WQFN |
| 供應(yīng)商設(shè)備封裝： | 10-TQFN（3x2） |
| 包裝： | 帶卷 (TR) |
LTC6409
10
6409fa
applicaTions inForMaTion
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 1). 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
RI +RF
With single-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 mode
voltage is approximately:
VICM =
V+IN + V–IN
2
≈ VOCM
RI
RI +RF
+
VCM
RF
RI +RF
+
VINP
2
RF
RI +RF
(2)
This means that if, for example, the input signal (VINP)
is a sine, an attenuated version of that sine signal also
appears at the op amp inputs.
Input Impedance and Loading Effects
The low frequency input impedance looking into the VINP
or VINM input of Figure 1 depends on how the inputs are
driven. For fully differential input sources (VINP = –VINM),
the input impedance seen at either input is simply:
RINP = RINM = RI
For single-ended inputs, because of the signal imbalance
at the input, the input impedance actually increases over
thebalanceddifferentialcase.Theinputimpedancelooking
into either input is:
RINP =RINM =
RI
1–
1
2
RF
RI +RF
Inputsignalsourceswithnon-zerooutputimpedancescan
alsocausefeedbackimbalancebetweenthepairoffeedback
networks. For the best performance, it is recommended
that the input source output impedance be compensated.
If input impedance matching is required by the source,
Figure 1. Circuit for Common Mode Range
–
+
RF
V–OUT
V+OUT
VVOCM
VOCM
6409 F01
RF
RI
+
–
VINP
+
–
VCM
–
+
VINM
V–IN
V+IN
suited for pre-amplification, level shifting and conversion
of single-ended signals to differential output signals for
driving differential input ADCs.
Output Common Mode and VOCM Pin
The output common mode voltage is defined as the aver-
age of the two outputs:
VOUTCM = VOCM =
V+OUT + V–OUT
2
As the equation shows, the output common mode voltage
is independent of the input common mode voltage, and
is instead determined by the voltage on the VOCM pin, by
means of an internal common mode feedback loop.
If the VOCM pin is left open, an internal resistor divider
develops a default voltage of 1.25V with a 5V supply. The
VOCM pin can be overdriven to another voltage if desired.
For example, when driving an ADC, if the ADC makes a
referenceavailableforsettingthecommonmodevoltage,it
can be directly tied to the VOCM pin, as long as the ADC is
capableofdrivingthe40kinputresistancepresentedbythe
VOCM pin. The Electrical Characteristics table specifies the
valid range that can be applied to the VOCM pin (VOUTCMR).
Input Common Mode Voltage Range
The LTC6409’s input common mode voltage (VICM) is
defined as the average of the two input pins, V+IN and
V–IN. The valid range that can be used for VICM has been
specified in the Electrical Characteristics table (VICMR).
However, due to external resistive divider action of the
gain and feedback resistors, the effective range of signals
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