參數(shù)資料
型號： ISPPAC20
廠商： Lattice Semiconductor Corporation
英文描述： In-System Programmable Analog Circuit
中文描述： 在系統(tǒng)可編程模擬電路
文件頁數(shù)： 18/32頁
文件大?。?/td> 525K
代理商： ISPPAC20
Specifications
ispPAC20
18
Theory of Operation (Continued)
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)
and becomes a factor in the overall output noise voltage,
causing it to increase.
Input Common-Mode Voltage Range
For the ispPAC20, 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 perfor-
mance.
相關(guān)PDF資料
PDF描述
ISPPAC20-01J In-System Programmable Analog Circuit
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