PGA309_05

Manufacturer Part NumberPGA309_05
DescriptionVoltage Output PROFRAMMABLE SENSOR CONDITIONER
ManufacturerBURR-BROWN [Burr-Brown Corporation]
PGA309_05 datasheet
 


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PROGRAMMABLE SENSOR CONDITIONER
FEATURES
D
COMPLETE BRIDGE SENSOR CONDITIONER
D
VOLTAGE OUTPUT: Ratiometric or Absolute
D
DIGITAL CAL: No Potentiometers/Sensor Trims
D
SENSOR ERROR COMPENSATION
− Span, Offset, and Temperature Drifts
D
LOW ERROR, TIME-STABLE
D
SENSOR LINEARIZATION CIRCUITRY
D
TEMPERATURE SENSE: Internal or External
D
CALIBRATION LOOKUP TABLE LOGIC
− Uses External EEPROM (SOT23-5)
D
OVER/UNDER-SCALE LIMITING
D
SENSOR FAULT DETECTION
D
+2.7V TO +5.5V OPERATION
D
−40°C to +125°C OPERATION
D
SMALL TSSOP-16 PACKAGE
APPLICATIONS
D
BRIDGE SENSORS
D
REMOTE 4-20mA TRANSMITTERS
D
STRAIN, LOAD, AND WEIGH SCALES
D
AUTOMOTIVE SENSORS
EVALUATION TOOLS
D
HARDWARE DESIGNER’S KIT (PGA309EVM)
− Temperature Eval of PGA309 + Sensor
− Full Programming of PGA309
− Sensor Compensation Analysis Tool
P
psi
0
+125_C
−40_C
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005
Voltage Output
DESCRIPTION
The PGA309 is a programmable analog signal conditioner
designed for bridge sensors. The analog signal path am-
plifies the sensor signal and provides digital calibration for
zero, span, zero drift, span drift, and sensor linearization
errors with applied stress (pressure, strain, etc.). The cal-
ibration is done via a One-Wire digital serial interface or
through a Two-Wire industry-standard connection. The
calibration parameters are stored in external nonvolatile
memory (typically SOT23-5) to eliminate manual trimming
and achieve long-term stability.
The all-analog signal path contains a 2x2 input multiplex-
er (mux), auto-zero programmable-gain instrumentation
amplifier, linearization circuit, voltage reference, internal
oscillator, control logic, and an output amplifier. Program-
mable level shifting compensates for sensor DC offsets.
The core of the PGA309 is the precision, low-drift, no 1/f
noise Front-End PGA (Programmable Gain Amplifier).
The overall gain of the Front-End PGA + Output Amplifier
can be adjusted from 2.7V/V to 1152V/V. The polarity of
the inputs can be switched through the input mux to ac-
commodate sensors with unknown polarity output. The
Fault Monitor circuit detects and signals sensor burnout,
overload, and system fault conditions.
For detailed application information, see the PGA309
User’s Guide (SBOU024), available for download at
www.ti.com.
N onlinear
V
EXC
PGA309
Bridge
Transducer
Analog Sensor Linearization
50
Fault
Monitor
Digital
Int Temp
Temperature
T
Compensation
Ext Temp
Ext Temp
Copyright  2003−2005, Texas Instruments Incorporated
www.ti.com
PGA309
V
S
Ref
Linearization
Circuit
Lin DAC
Over/Under
Linear
Auto−Zero
Scale Limiter
PGA
V
OUT
Analog Signal Conditioning
Digital Cal
Temp
EEPROM
Control Register
ADC
(SOT23− 5)
Interface Circuitry

PGA309_05 Summary of contents

  • Page 1

    PROGRAMMABLE SENSOR CONDITIONER FEATURES D COMPLETE BRIDGE SENSOR CONDITIONER D VOLTAGE OUTPUT: Ratiometric or Absolute D DIGITAL CAL: No Potentiometers/Sensor Trims D SENSOR ERROR COMPENSATION − Span, Offset, and Temperature Drifts D LOW ERROR, TIME-STABLE D SENSOR LINEARIZATION CIRCUITRY D ...

  • Page 2

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 PACKAGE/ORDERING INFORMATION PACKAGE DRAWING PRODUCT PACKAGE−LEAD PGA309 PGA309 TSSOP-16 TSSOP-16 (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data ...

  • Page 3

    ELECTRICAL CHARACTERISTICS BOLDFACE limits apply over the specified temperature range +25° + SUPPLY ANALOG , SUPPLY DIGITAL ; V SA must ...

  • Page 4

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 ELECTRICAL CHARACTERISTICS (continued) BOLDFACE limits apply over the specified temperature range +25° + SUPPLY ANALOG , V ...

  • Page 5

    ELECTRICAL CHARACTERISTICS (continued) BOLDFACE limits apply over the specified temperature range +25° + SUPPLY ANALOG , SUPPLY DIGITAL ; V SA ...

  • Page 6

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 ELECTRICAL CHARACTERISTICS (continued) BOLDFACE limits apply over the specified temperature range +25° + SUPPLY ANALOG , V ...

  • Page 7

    ELECTRICAL CHARACTERISTICS (continued) BOLDFACE limits apply over the specified temperature range +25° + SUPPLY ANALOG , SUPPLY DIGITAL ; V SA ...

  • Page 8

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 PIN CONFIGURATION Top View PIN DESCRIPTION PIN NAME DESCRIPTION 1 V EXC Bridge sensor excitation. Connect to bridge if linearization and/or internal reference for bridge excitation used. 2 ...

  • Page 9

    TYPICAL CHARACTERISTICS +25° + SUPPLY ANALOG , SUPPLY DIGITAL , V SA must equal GND D = GND A ...

  • Page 10

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 TYPICAL CHARACTERISTICS (Cont +25° + SUPPLY ANALOG , SUPPLY DIGITAL , V SA must ...

  • Page 11

    TYPICAL CHARACTERISTICS (Cont +25° + SUPPLY ANALOG , SUPPLY DIGITAL , V SA must equal GND D = GND ...

  • Page 12

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 TYPICAL CHARACTERISTICS (Cont +25° + SUPPLY ANALOG , SUPPLY DIGITAL , V SA must ...

  • Page 13

    FUNCTIONAL DESCRIPTION The PGA309 is a programmable analog signal conditioner designed for resistive bridge sensor applications complete signal conditioner with bridge excitation, initial span and offset adjustment, temperature adjustment of span internal/external temperature measurement capability, output ...

  • Page 14

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 PGA309 V EXC Σ K LIN V Internal O UT Temp Sense TEMP IN Temp ADC Signals Mux Coarse Offset Adjust IN1 Front−End PGA (Gain 4 to 128) ...

  • Page 15

    ADC FOR TEMPERATURE SENSING The temperature sense circuitry compensation for the sensor span and offset drift. Either internal or external temperature sensing is possible. The temperature can be sensed in one of the following ways: D Bridge impedance change ...

  • Page 16

    PGA309 SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005 flag is programmed for high, then > 97% ADC range will be a fault; if programmed for low, then < 3% ADC range will be a fault. In this configuration, the ...

  • Page 17

    DETAILED BLOCK DIAGRAM Linearization and V PGA309 V Enable EXC 7−Bit + Sign V EXC Lin DAC V EXC Σ TEMP 7µA Internal Internal REF Temp Sense I Enable TEMP TEMP TEMP ...

  • Page 18

    PACKAGING INFORMATION (1) Orderable Device Status PGA309AIPWR ACTIVE PGA309AIPWRG4 ACTIVE PGA309AIPWT ACTIVE PGA309AIPWTG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be ...

  • Page 19

    TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing PGA309AIPWR TSSOP PW PGA309AIPWT TSSOP PW PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 16 2500 330.0 12.4 7.0 16 ...

  • Page 20

    Device Package Type PGA309AIPWR TSSOP PGA309AIPWT TSSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 PW 16 250 Pack Materials-Page 2 30-Jan-2009 Width (mm) Height (mm) 346.0 346.0 29.0 190.5 212.7 ...

  • Page 21

    PW (R-PDSO-G**) 14 PINS SHOWN 0, 0,15 1,20 MAX 0,05 PINS ** DIM A MAX A MIN NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body ...

  • Page 22

    Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the ...