參數(shù)資料
型號(hào)： LTC1992-2CMS8#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 29/42頁(yè)
文件大小： 0K
描述： IC AMP/DVR I/O GAIN-2 DIFF 8MSOP
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： 0°C ~ 70°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)
LTC1992 Family
35
1992fb
APPLICATIONS INFORMATION
Fully Differential Amplifier Applications
Circuit Analysis
All of the previous applications circuit discussions have as-
sumed perfectly matched symmetrical feedback networks.
To consider the effects of mismatched or asymmetrical
feedback networks, the equations get a bit messier.
Figure 6 lists the basic gain equation for the differential
output voltage in terms of +VIN, –VIN, VOSDIFF, VOUTCM
and the feedback factors
β1 and β2. The feedback factors
are simply the portion of the output that is fed back to the
input summing junction by the RFB-RIN resistive voltage
divider.
β1 and β2 have the range of zero to one. The
VOUTCM term also includes its offset voltage, VOSCM, and
its gain mismatch term, KCM. The KCM term is determined
by the matching of the on-chip RCMP and RCMM resistors
in the common mode level servo (see Figure 2).
While mathematically correct, the basic signal equation
does not immediately yield any intuitive feel for fully
differential amplifier application operation. However, by
nulling out specific terms, some basic observations and
sensitivities come forth. Setting
β1 equal to β2, VOSDIFF
to zero and VOUTCM to VOCM gives the old gain equation
from Figure 3. The ground referenced, single-ended input
signal equation yields the interesting result that the driven
side feedback factor (
β1) has a very different sensitivity
than the grounded side (
β2). The CMRR is twice the
feedback factor difference divided by the feedback fac-
tor sum. The differential output offset voltage has two
terms. The first term is determined by the input offset
term, VOSDIFF, and the application’s gain. Note that this
term equates to the formula in Figure 3 when
β1 equals
β2. The amount of signal level shifting and the feedback
factor mismatch determines the second term. This term
Table 1. Input Signal Limitations for Some Common Applications
Single Supply Ground Referenced Single-Ended Input Signal, VOCM at Mid-Supply. (The VINSIG Min and Max values listed account for
both the input common mode limits and the output clipping)
Single Supply Ground Referenced Single-Ended Input Signal, VOCM at Typical ADC Reference Levels. (The VINSIG Min and Max values
listed account for both the input common mode limits and the output clipping)
+VS
(V)
–VS
(V)
GAIN
(V/V)
VOCM
(V)
VINREF
(V)
VINSIG(MAX)
(V)
VINSIG(MIN)
(V)
VINSIGP-P(MAX)
(VP-P AROUND VINREF)
VOUTDIFF(MAX)
(VP-PDIFF)
2.7
0
1
1.35
0
2.700
–2.700
5.40
2.7
0
2
1.35
0
1.350
–1.350
2.70
5.40
2.7
0
5
1.35
0
0.540
–0.540
1.08
5.40
2.7
0
10
1.35
0
0.270
–0.270
0.54
5.40
5
0
1
2.5
0
5.000
–5.000
10.00
5
0
2
2.5
0
2.500
–2.500
5.00
10.00
5
0
5
2.5
0
1.000
–1.000
2.00
10.00
5
0
10
2.5
0
0.500
–0.500
1.00
10.00
+VS
(V)
–VS
(V)
GAIN
(V/V)
VOCM
(V)
VINREF
(V)
VINSIG(MAX)
(V)
VINSIG(MIN)
(V)
VINSIGP-P(MAX)
(VP-P AROUND VINREF)
VOUTDIFF(MAX)
(VP-PDIFF)
2.7
0
1
0
2.000
–2.000
4.00
2.7
0
2
1
0
1.000
–1.000
2.00
4.00
2.7
0
5
1
0
0.400
–0.400
0.80
4.00
2.7
0
10
1
0
0.200
–0.200
0.40
4.00
5
0
1
2
0
4.000
–4.000
8.00
5
0
2
0
2.000
–2.000
4.00
8.00
5
0
5
2
0
0.800
–0.800
1.60
8.00
5
0
10
2
0
0.400
–0.400
0.80
8.00
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