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PDF PGA309AIPWR Data sheet ( Hoja de datos )
| Número de pieza | PGA309AIPWR | |
| Descripción | Voltage Output PROGRAMMABLE SENSOR CONDITIONER | |
| Fabricantes | Burr-Brown Corporation | |
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PGA309
SBOS292A − DECEMBER 2003 − REVISED AUGUST 2004
Voltage Output
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
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.
EVALUATION TOOLS
D HARDWARE DESIGNER’S KIT (PGA309EVM)
− Temperature Eval of PGA309 + Sensor
− Full Programming of PGA309
− Sensor Compensation Analysis Tool
N onlinear
Bridge
P Transducer
psi
0 50
For detailed application information, see the PGA309
User’s Guide (SBOU024), available for download at
www.ti.com.
VS
VEXC
PGA309
Linearization
Circuit
Analog Sensor Linearization
Ref
Lin DAC
+125_ C
−40_C
T
Ext Temp
Fault
Monitor
Auto−Zero
PGA
Over/Under
Scale Limiter
Analog Signal Conditioning
Digital
Int Temp
Temperature
Compensation
Ext Temp
Temp
ADC
Control Register
Interface Circuitry
Linear
VOUT
Digital Cal
EEPROM
(SOT23−5)
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.
Copyright 2003−2004, Texas Instruments Incorporated
www.ti.com
1 page  
PGA309
www.ti.com
SBOS292A − DECEMBER 2003 − REVISED AUGUST 2004
ELECTRICAL CHARACTERISTICS (continued)
BOLDFACE limits apply over the specified temperature range: TA = −40°C to +125°C
TA = +25°C, VSA = VSD = +5V (VSA = VSUPPLY ANALOG, VSD = VSUPPLY DIGITAL; VSA must equal VSD), GNDD = GNDA = 0, and VREF = REFIN/REFOUT = +5V,
unless otherwise noted.
PGA309
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTERNAL VOLTAGE REFERENCE
VREF1
VREF1 Drift vs Temperature
VREF2
VREF2 Drift vs Temperature
Input Current REFIN/REFOUT
Output Current REFIN/REFOUT
TEMPERATURE SENSE CIRCUITRY (ADC)
Internal Temperature Measurement
Accuracy
Resolution
Temperature Measurement Range
Conversion Rate
TEMPERATURE ADC
External Temperature Mode
Gain Range Steps
Analog Input Voltage Range
Temperature ADC Internal REF (2.048V)
Full-Scale Input Voltage
Differential Input Impedance
Common-Mode Input Impedance
Resolution
Integral Nonlinearity
Offset Error
Offset Drift
Offset vs VSA
Gain Error
Gain Error Drift
Noise
Gain vs VSA
Common-Mode Rejection
Register 3, Bit D9 = 1
Register 3, Bit D9 = 0
Internal VREF Disabled
VSA > 2.7V for VREF = 2.5V
VSA > 4.3V for VREF = 4.096V
2.46
4.0
2.5
+10
4.096
+10
100
1
1
2.53
4.14
V
ppm/°C
V
ppm/°C
µA
mA
mA
Register 6, Bit D9 = 1
12-Bit + Sign, Two’s Complement Data Format
R1, R0 = ‘11’, 12-Bit + Sign Resolution
±2
±0.0625
−55 +150
24
°C
°C
°C
ms
Temp PGA + Temp ADC
GPGA = 1, 2, 4, 8
Register 6, Bit D8 = 1
(+Input) − (−Input)
GPGA = 1
GPGA = 2
GPGA = 4
GPGA = 8
R1, R0 = ‘00’, ADC2X = ‘0’, Conversion Time = 8ms
R1, R0 = ‘01’, ADC2X = ‘0’, Conversion Time = 32ms
R1, R0 = ‘10’, ADC2X = ‘0’, Conversion Time = 64ms
R1, R0 = ‘11’, ADC2X = ‘0’, Conversion Time = 128ms
GPGA = 1
GPGA = 2
GPGA = 4
GPGA = 8
GPGA = 1
GPGA = 2
GPGA = 4
GPGA = 8
GPGA = 1
GPGA = 2
GPGA = 4
GPGA = 8
All Gains
At DC and GPGA = 8
At DC and GPGA = 1
GND−0.2
1 to 8
VSA+0.2
V/V
V
±2.048/GPGA
2.8/GPGA
3.5
3.5
1.8
0.9
11
13
14
15
0.004
1.2
0.7
0.5
0.4
1.2
0.6
0.3
0.3
800
400
200
150
0.05
5
<1
80
105
100
0.50
50
V
MΩ
MΩ
MΩ
MΩ
MΩ
Bits + Sign
Bits + Sign
Bits + Sign
Bits + Sign
%
mV
mV
mV
mV
µV/°C
µV/°C
µV/°C
µV/°C
µV/V
µV/V
µV/V
µV/V
%
ppm/°C
LSB
ppm/V
dB
dB
5
5 Page 
PGA309
www.ti.com
SBOS292A − DECEMBER 2003 − REVISED AUGUST 2004
TYPICAL CHARACTERISTICS (Cont.)
TA = +25°C, VSA = VSD = +5V (VSA = VSUPPLY ANALOG, VSD = VSUPPLY DIGITAL, VSA must equal VSD), GNDD = GNDA = 0, and VREF = REFIN/REFOUT = +5V,
unless otherwise noted.
LARGE−SIGNAL STEP RESPONSE
Gain = 8
LARGE−SIGNAL STEP RESPONSE
Gain = 1152
Time (10µs/div)
SMALL−SIGNAL STEP RESPONSE
Gain = 8
Time (10µs/div)
SMALL−SIGNAL STEP RESPONSE
Gain = 256
Time (10µs/div)
CAPACITIVE LOAD DRIVE
25
GOUTAMP = 2V/V
20
15
10 GOUTAMP = 9V/V
GOUTAMP = 3.6V/V
5
0
0
500
1000
1500
2000
2500
CLOAD (pF)
Time (10µs/div)
OVERVOLTAGE RECOVERY
VOUT
VIN
Time (100µs/div)
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet PGA309AIPWR.PDF ] | |
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