isppac80 Lattice Semiconductor Corp., isppac80 Datasheet - Page 12

• Manufacturer Part Number: isppac80
• Description: In-system Programmable Analog Circuit
• Manufacturer: Lattice Semiconductor Corp.

Design Entry Software
Designers configure the ispPAC80 and verify its perfor-
mance using PAC-Designer, an easy-to-use, Microsoft
Windows compatible program. Circuit designs are en-
tered graphically and then verified, all within the
PAC-Designer environment. Full device programming is
supported using PC parallel port I/O operations and a
download cable connected to the serial programming
interface of the ispPAC80. A database of filter configura-
tions is included with thousands of possible
implementations to choose from. In addition, compre-
hensive on-line and printed documentation is provided
that covers all aspects of PAC-Designer operation.
The PAC-Designer schematic window, shown in Figure
2, provides access to all configurable ispPAC80 ele-
ments via its graphical user interface. All analog input
Figure 2. Initial PAC-Designer Schematic Design Entry Screen
Software-Based Design Environment
Design1
Cfg A
Cfg B
IN
32.113
1.970
C1
Type=Butterworth
Fc=500.0kHz
Fp=
PB Ripple=
SB Atten.=
1, 2, 5, 10
0.000
4.890
IA
C2
38.492
5.140
L2
Cfg A
Lowpass Filter
A/B 2:1 Mux
5th Order
PACell
66.918
12
6.332
C3
and output pins are represented. Static or non-
configurable pins such as power, ground, V
the serial digital interface are omitted for clarity. Any
element in the schematic window can be accessed via
mouse operations as well as menu commands. When
completed, configurations can be saved, simulated, and
downloaded to devices.
PAC-Designer operation can be automated and ex-
tended by using custom-designed Visual Basic™
programs that set the interconnections and the param-
eters of ispPAC products. More information on this and
other topics is included in the on-line documentation as
well as the PAC-Designer Getting Started Manual.
Type=Elliptic
Fc=50.0kHz
Fp=75.0kHz
PB Ripple=0.1dB
SB Atten.=-40.0dB
14.726
0.000
C4
Specifications ispPAC80
OA
28.512
5.256
Cfg B
L4
17.486
1.020
C5
OUT
REFOUT
, and