ispPAC10-01PI Lattice Semiconductor, ispPAC10-01PI Datasheet - Page 15

• Manufacturer Part Number: ispPAC10-01PI
• Description: In-System Programmable Analog Circuit
• Manufacturer: Lattice Semiconductor

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
When the value of V
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
one, distortion will occur when the maximum input limit is
Table 1. Input Common-Mode Voltage Range Limitations
*Peak input voltage for guaranteed performance at a given gain setting.
Theory of Operation (Continued)
1.000
1.100
1.200
1.300
1.400
1.500
1.600
1.700
1.800
1.900
2.000
2.100
2.200
2.300
2.400
2.426
2.500
V
CM
CM-
is not 2.5V and the gain setting is greater than
4.000
3.900
3.800
3.700
3.600
3.500
3.400
3.300
3.200
3.100
3.000
2.900
2.800
2.700
2.600
2.574
2.500
V
CM+
CM
is 2.5V, there are no further input
3.000*
0.557
0.728
0.899
1.071
1.242
1.413
1.584
1.756
1.927
2.098
2.270
2.441
2.612
2.783
2.955
3.126
G=1
1.500*
CM
0.278
0.364
0.450
0.535
0.621
0.707
0.792
0.878
0.964
1.049
1.135
1.220
1.306
1.392
1.477
1.563
G=2
= (V
Input Voltage Magnitude (Volts-Peak)
CM+
1.000*
0.186
0.243
0.300
0.357
0.414
0.471
0.528
0.585
0.642
0.699
0.757
0.814
0.871
0.928
0.985
1.042
G=3
+ V
CM-
0.750*
0.139
0.182
0.225
0.268
0.310
0.353
0.396
0.439
0.482
0.525
0.567
0.610
0.653
0.696
0.739
0.782
)/2.
G=4
15
reached for a particular gain. The lowest V
gain setting is expressed by the formula, V
+ 0.584G·V
peak input voltage, expressed as |V
highest V
nominal supply voltage.
In Table 1, the maximum V
range is given. If the maximum V
equivalent or greater value under the appropriate gain
column and the widest range for V
horizontally across in the left-most two columns. Only a
V
free performance. Conversely, if the maximum V
is known, the largest acceptable peak value of V
found in the corresponding gain column. All values of V
less than this will give full rated performance.
CM
0.600*
0.111
0.146
0.180
0.214
0.248
0.283
0.317
0.351
0.385
0.420
0.454
0.488
0.522
0.557
0.591
0.625
G=5
range equal to or less than this will give distortion-
CM
Specifications ispPAC10
0.500*
0.093
0.121
0.150
0.178
0.207
0.236
0.264
0.293
0.321
0.350
0.378
0.407
0.435
0.464
0.492
0.521
IN
G=6
where G is the gain setting and V
is V
CM+
0.429*
0.080
0.104
0.128
0.153
0.177
0.202
0.226
0.251
0.275
0.300
0.324
0.349
0.373
0.398
0.422
0.447
G=7
= 5.0V - V
IN
0.375*
0.070
0.091
0.112
0.134
0.155
0.177
0.198
0.219
0.241
0.262
0.284
0.305
0.327
0.348
0.369
0.391
G=8
for a given V
CM–
IN
0.333*
IN+
is known, find the
0.062
0.081
0.100
0.119
0.138
0.157
0.176
0.195
0.214
0.233
0.252
0.271
0.290
0.309
0.328
0.347
CM
G=9
where 5V is the
- V
will be found
CM
CM–
CM–
IN–
for a given
0.300*
G=10
0.056
0.073
0.090
0.107
0.124
0.141
0.158
0.176
0.193
0.210
0.227
0.244
0.261
0.278
0.295
0.313
| and the
= 0.675V
CM
IN
to V
IN
can be
range
is the
CM+
IN