參數(shù)資料
型號(hào)： ISPPAC10-01SI
廠商： LATTICE SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： In-System Programmable Analog Circuit
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO28
封裝： PLASTIC, SOIC-28
文件頁(yè)數(shù)： 15/23頁(yè)
文件大小： 415K
代理商： ISPPAC10-01SI
Specifications
ispPAC10
15
Theory of Operation (Continued)
Input Common-Mode Voltage Range
For the ispPAC10, both maximum input signal range and
corresponding common-mode voltage range are a func-
tion of the input gain setting. The maximum input voltage
times the gain of an individual PACblock cannot exceed
the output range of that block or clipping will occur. The
maximum guaranteed input range is 1V to 4V, with an
extended typical range of 0.7V to 4.3V for a 5V supply
voltage.
The input common-mode voltage is V
CM
=(V
CM+
+ V
CM-
)/2.
When the value of V
CM
is 2.5V, there are no further input
restrictions other than the previously mentioned clipping
consideration. This is easily achieved when the input
signal is true differential and referenced to 2.5V.
When V
CM
is not 2.5V and the gain setting is greater than
one, distortion will occur when the maximum input limit is
reached for a particular gain. The lowest V
CM
for a given
gain setting is expressed by the formula, V
CM
–
= 0.675V
+ 0.584G
·
V
IN
where G is the gain setting and V
IN
is the
peak input voltage, expressed as |V
IN+
- V
IN
–
| and the
highest V
CM
is V
CM+
= 5.0V - V
CM
–
where 5V is the
nominal supply voltage.
In Table 1, the maximum V
IN
for a given V
CM
–
to V
CM+
range is given. If the maximum V
IN
is known, find the
equivalent or greater value under the appropriate gain
column and the widest range for V
CM
will be found
horizontally across in the left-most two columns. Only a
V
CM
range equal to or less than this will give distortion-
free performance. Conversely, if the maximum V
CM
range
is known, the largest acceptable peak value of V
IN
can be
found in the corresponding gain column. All values of V
IN
less than this will give full rated performance.
V
CM-
V
CM+
G=1
G=2
G=3
G=4
G=5
G=6
G=7
G=8
G=9
G=10
1.000
4.000
0.557
0.278
0.186
0.139
0.111
0.093
0.080
0.070
0.062
0.056
1.100
3.900
0.728
0.364
0.243
0.182
0.146
0.121
0.104
0.091
0.081
0.073
1.200
3.800
0.899
0.450
0.300
0.225
0.180
0.150
0.128
0.112
0.100
0.090
1.300
3.700
1.071
0.535
0.357
0.268
0.214
0.178
0.153
0.134
0.119
0.107
1.400
3.600
1.242
0.621
0.414
0.310
0.248
0.207
0.177
0.155
0.138
0.124
1.500
3.500
1.413
0.707
0.471
0.353
0.283
0.236
0.202
0.177
0.157
0.141
1.600
3.400
1.584
0.792
0.528
0.396
0.317
0.264
0.226
0.198
0.176
0.158
1.700
3.300
1.756
0.878
0.585
0.439
0.351
0.293
0.251
0.219
0.195
0.176
1.800
3.200
1.927
0.964
0.642
0.482
0.385
0.321
0.275
0.241
0.214
0.193
1.900
3.100
2.098
1.049
0.699
0.525
0.420
0.350
0.300
0.262
0.233
0.210
2.000
3.000
2.270
1.135
0.757
0.567
0.454
0.378
0.324
0.284
0.252
0.227
2.100
2.900
2.441
1.220
0.814
0.610
0.488
0.407
0.349
0.305
0.271
0.244
2.200
2.800
2.612
1.306
0.871
0.653
0.522
0.435
0.373
0.327
0.290
0.261
2.300
2.700
2.783
1.392
0.928
0.696
0.557
0.464
0.398
0.348
0.309
0.278
2.400
2.600
2.955
1.477
0.985
0.739
0.591
0.492
0.422
0.369
0.328
0.295
2.426
2.574
3.000*
1.500*
1.000*
0.750*
0.600*
0.500*
0.429*
0.375*
0.333*
0.300*
2.500
2.500
3.126
1.563
1.042
0.782
0.625
0.521
0.447
0.391
0.347
0.313
Table 1. Input Common-Mode Voltage Range Limitations
*Peak input voltage for guaranteed performance at a given gain setting.
Input Voltage Magnitude (Volts-Peak)
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