PAC80 Lattice Semiconductor Corp., PAC80 Datasheet

PAC80

Manufacturer Part Number

PAC80

Description

In-system Programmable Analog Circuit

Manufacturer

Lattice Semiconductor Corp.

Datasheet

1.PAC80.pdf (19 pages)

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• IN-SYSTEM PROGRAMMABLE (ISP™) ANALOG

• UNIQUE FLEXIBILITY AND PERFORMANCE

• TRUE DIFFERENTIAL I/O

• SINGLE SUPPLY 5V OPERATION

• APPLICATIONS INCLUDE INTEGRATED

to change without notice.

LATTICE SEMICONDUCTOR CORP., 5555 Northeast Moore Ct., Hillsboro, Oregon 97124, U.S.A.

Tel. (503) 268-8000; 1-888-477-7537; FAX (503) 268-8037; http://www.latticesemi.com

pac80_03

Features

Typical Application Diagram

Vin

— Instrument Amplifier Gain Stage

— Precision Active Filtering (50kHz to 500kHz)

— Continuous-Time Fifth Order Low Pass Topology

— Dual, A/B Configuration Memory

— Non-Volatile E

— IEEE 1149.1 JTAG Serial Port Programming

— Programmable Gain Range (0dB to 20dB)

— Implements Multiple Filter Types: Elliptical,

— Low Distortion (THD < -74dB max @ 100kHz)

— Auto-Calibrated Input Offset Voltage

— High CMR (58dB) Instrument Amplifier Input

— 2.5V Common Mode Reference on Chip

— Rail-to-Rail Voltage Outputs

— Power Dissipation of 165mW

— 16-Pin Plastic SOIC, PDIP Packages

— Single +5V Supply Signal Conditioning

— Programmable Filters With Fully Differential I/O

— Analog Front Ends, 12-Bit Data Acq. Systems

— DSP System Front End Signal Conditioning

— High-Performance Reconstruction Filters

Chebyshev, Bessel, Butterworth, Linear Phase,

Gaussian and Legendre

ispPAC80

A/B & Gain

SPI Control

DSP

CMOS Cells

VREFout

Ain+

Ain-

12-Bit Differential

Reference

Input ADC

The ispPAC80 is a member of the Lattice family of In-System

Programmable analog circuits, digitally configured via non-

volatile E

Analog building blocks, called PACell™(s), replace traditional

analog components such as opamps, eliminating the need for

external resistors and capacitors. With no requirement for

external configuration components, ispPAC80 expedites the

design process, simplifying prototype circuit implementation

and change, while providing high-performance integrated func-

tionality. With all components on chip, there is no longer a

concern of performance degradation due to component mis-

match or other external factors. The ispPAC80 provides reliable

and repeatable performance, every time.

Designers configure the ispPAC80 and verify its performance

using PAC-Designer™, an easy to use, Microsoft Windows

compatible program. A filter configuration database is provided

whereby thousands of different configurations can be realized.

No special understanding of filter synthesis is required beyond

that of general specifications such as corner frequency and

stopband attenuation, etc. The software lists the possible

choices that meet the designer’s specifications which can then

(A/B) configurations from the lookup table. Device program-

ming is supported using PC parallel port I/O operations.

The ispPAC80 is configured through its IEEE Standard 1149.1

compliant serial port. The flexible In-System Programming

capability enables programming, verification and reconfig-

uration, if desired, directly on the printed circuit board.

ENSPI

Functional Block Diagram

Description

GND

TMS

TDO

TCK

CAL

TDI

In-System Programmable Analog Circuit

loaded

CMOS

E 2 CMOS Cfg A

Ref & Auto-Cal

directly

technology.

5th Order LPF

ispPAC80

into

E 2 CMOS Cfg B

ispPAC 80

ISP Control

either

two

March 2000

TEST

OUT+

OUT–

TEST

IN+

IN–

VREFOUT

device

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