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| 型號： | LTC1992IMS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 30/42頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP/DVR I/O FULLY DIFF 8-MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分，滿擺幅 |
| 轉(zhuǎn)換速率： | 1.5 V/µs |
| 增益帶寬積： | 3.2MHz |
| 電流 - 輸入偏壓： | 2pA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 700µA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 11 V，±1.35 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
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LTC1992 Family
36
1992fb
APPLICATIONS INFORMATION
quantifies the undesired effect of signal level shifting
discussed earlier in the Signal Level Shifting section.
Asymmetrical Feedback Application Circuits
The basic signal equation in Figure 6 also gives insight
to another piece of intuition. The feedback factors may
be deliberately set to different values. One interesting
class of these application circuits sets one or both of the
feedback factors to the extreme values of either zero or
one. Figure 7 shows three such circuits.
At first these application circuits may look to be unstable
or open loop. It is the common mode feedback loop that
enables these circuits to function. While they are useful
circuits, they have some shortcomings that must be con-
sidered. First, due to the severe feedback factor asymmetry,
the VOCM level influences the differential output voltage
with about the same strength as the input signal. With
this much gain in the VOCM path, differential output offset
and noise increase. The large VOCM to VOUTDIFF gain also
necessitates that these circuits are largely limited to dual,
split supply voltage applications with a ground referenced
input signal and a grounded VOCM pin.
The top application circuit in Figure 7 yields a high input
impedance, precision gain of 2 block without any external
resistors. The on-chip common mode feedback servo
resistors determine the gain precision (better than 0.1
percent). By using the –VOUT output alone, this circuit is
also useful to get a precision, single-ended output, high
input impedance inverter. To intuitively understand this
circuit, consider it as a standard op amp voltage follower
(delivered through the signal gain servo) with a comple-
mentary output (delivered through the common mode level
servo). As usual, the amplifier’s input common mode range
must not be exceeded. As with a standard op amp voltage
follower, the common mode signal seen at the amplifier’s
input is the input signal itself. This condition limits the
input signal swing, as well as the output signal swing, to
be the input signal common mode range specification.
The middle circuit is largely the same as the first except
that the noninverting amplifier path has gain. Note that
Figure 6. Basic Equations for Mismatched or Asymmetrical Feedback Applications Circuits
–
+
RIN2
RIN1
2[+VIN (1 – 1) – (–VIN) (1 – 2)] + 2VOSDIFF + 2VOUTCM ( 1 – 2)
1 + 2
RFB1
VOCM
VOUTDIFF =
WHERE:
FOR GROUND REFERENCED, SINGLE-ENDED INPUT SIGNAL, LET +VIN = VINSIG AND –VIN = 0V
RFB2
–VIN
VINDIFF
+VIN – –VIN
+VIN
–VOUT
+VOUT
1992 F06
LTC1992
VOUTDIFF
+VOUT – –VOUT
2 VINSIG (1 – 1) + 2VOSDIFF + 2VOUTCM ( 1 – 2)
1 + 2
VOUTDIFF =
COMMON MODE REJECTION: SET +VIN = –VIN = VINCM, VOSDIFF = 0V, VOUTCM = 0V
ΔVINCM
ΔVOUTDIFF
CMRR =
= 2
; OUTPUT REFERRED
1 + 2
2 – 1
1 + 2
OUTPUT DC OFFSET VOLTAGE: SET +VIN = –VIN = VINCM
VOSDIFFOUT = VOSDIFF
+ (VOUTCM – VINCM) 2
2
1 + 2
RIN1
RIN1 + RFB1
1 =
; 2 =
; VOSDIFF = AMPLIFIER INPUT REFERRED OFFSET VOLTAGE
VOUTCM = KCM VOCM + VOSCM
0.999 < KCM < 1.001
RIN2
RIN2 + RFB2
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