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參數(shù)資料
| 型號： | LTC6911IMS-2#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PGA DIGITAL R-R DUAL 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 可編程增益 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 16 V/µs |
| 增益帶寬積： | 11MHz |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 3.1mA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 10.5 V，±2.7 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
LTC6911-1/LTC6911-2
12
sn691112 691112fs
UU
U
PI FU CTIO S
INA (Pin 1): Analog Input. The input signal to the A channel
amplifier of the LTC6911-X is the voltage difference be-
tween the INA and AGND pin. The INA pin connects
internally to a digitally controlled resistance whose other
end is a current summing point at the same potential as the
AGND pin (Figure 1). At unity gain (digital input 001), the
value of this input resistance is approximately 10k
and
the INA pin voltage range is rail-to-rail (V+ to V–). At gain
settings above unity, the input resistance falls. The linear
input range at INA also falls inversely proportional to the
programmed gain. Tables 1 and 2 summarize this behav-
ior. The higher gains are designed to boost lower level
signals with good noise performance. In the “zero” gain
state (digital input 000), analog switches disconnect the
INA pin internally and this pin presents a very high input
resistance. The input may vary from rail to rail in the “zero”
gain setting, but the output is insensitive to it and is forced
to the AGND potential.
Circuitry driving the INA pin must consider the LTC6911-X’s
input resistance, its lot-to-lot variance, and the variation of
this resistance from gain setting to gain setting. Signal
sources with significant output resistance may introduce
a gain error as the source’s output resistance and the
LTC6911-X’s input resistance form a voltage divider. This
is especially true at higher gain settings where the input
resistance is the lowest.
In single supply voltage applications, it is important to
remember that the LTC6911-X’s DC ground reference for
both input and output is AGND, not V–. With increasing
gains, the LTC6911-X’s input voltage range for an unclipped
output is no longer rail-to-rail but diminishes inversely to
gain, centered about the AGND potential.
Figure 1. Block Diagram
–
+
INPUT R ARRAY
FEEDBACK R ARRAY
OUTA
MOS-INPUT
OP AMP
MOS-INPUT
OP AMP
INA
G1
G2
G0
10
V–
9
V+
691112 F01
7
–
+
OUTB
8
1
INPUT R ARRAY
FEEDBACK R ARRAY
INB
3
AGND
V+
V–
10k
2
CMOS LOGIC
5
6
4
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