PGA309_05 BURR-BROWN [Burr-Brown Corporation], PGA309_05 Datasheet - Page 8

• Manufacturer Part Number: PGA309_05
• Description: Voltage Output PROFRAMMABLE SENSOR CONDITIONER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

PGA309
SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005
PIN CONFIGURATION
8
PIN DESCRIPTION
Top View
PIN
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
NAME
V EXC
GND A
V SA
V IN1
V IN2
V FB
V OUT
V SJ
TEST
V SD
GND D
PRG
SCL
SDA
TEMP IN
REF IN /REF OUT
DESCRIPTION
Bridge sensor excitation. Connect to bridge if linearization and/or internal reference for bridge excitation is to be used.
Analog ground. Connect to analog ground return path for V SA . Should be same as GND D .
Analog voltage supply. Connect to analog voltage supply. To be within 200mV of V SD .
Signal input voltage 1. Connect to + or – output of sensor bridge. Internal multiplexer can change connection internally to
Front-End PGA.
Signal input voltage 2. Connect to + or – output of sensor bridge. Internal multiplexer can change connection internally to
Front-End PGA.
V OUT feedback pin. Voltage feedback sense point for over/under-scale limit circuitry. When internal gain set resistors for the
output amplifier are used, this is also the voltage feedback sense point for the output amplifier. V FB in combination with V SJ
allows for ease of external filter and protection circuits without degrading the PGA309 V OUT accuracy. V FB must always be
connected to either V OUT or the point of feedback for V OUT , if external protection is used.
Analog output voltage of conditioned sensor.
Output amplifier summing junction. Use for output amplifier compensation when driving large capacitive loads
(> 100pF) and/or for using external gain setting resistors for the output amplifier.
Test/External Controller Mode pin. Pull to GND D in normal mode.
Digital voltage supply. Connect to digital voltage supply. To be within 200mV of V SA .
Digital ground. Connect to digital ground return path for V SD . Should be same as GND A .
Single-wire interface program pin. UART-type interface for digital calibration of the PGA309 over a single wire. Can be
connected to V OUT for a three-lead (V S , GND, V OUT ) digitally-programmable sensor assembly.
Clock input/output for Two-Wire, industry-standard compatible interface for reading and writing digital calibration and
configuration from external EEPROM. Can also communicate directly to the registers in the PGA309 through the Two-Wire,
industry-standard compatible interface.
Data input/output for Two-Wire, industry-standard compatible interface for reading and writing digital calibration and
configuration from external EEPROM. Can also communicate directly to the registers in the PGA309 through the Two-Wire,
industry-standard compatible interface.
External temperature signal input. PGA309 can be configured to read a bridge current sense resistor as an indicator of bridge
temperature, or an external temperature sensing device such as diode junction, RTD, or thermistor. This input can be internally
gained by 1, 2, 4, or 8. In addition, this input can be read differentially with respect to V GNDA , V EXC , or the internal/external
V REF . There is also an internal, register-selectable, 7µA current source (I TEMP ) that can be connected to TEMP IN as an RTD,
thermistor, or diode excitation source.
Reference input/output pin. As an output, the internal reference (selectable as 2.5V or 4.096V) is available for system use on
this pin. As an input, the internal reference may be disabled and an external reference can then be applied as the reference for
the PGA309.
GND
V
V
V
V
V
V
V
OUT
EXC
IN1
IN2
SA
SJ
FB
A
1
2
3
4
5
6
7
8
PGA309
16
15
14
13
12
11
10
9
REF
TEMP
SDA
SCL
PRG
GND
V
TEST
SD
IN
D
/REF
IN
OUT
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