Datasheet

Interface and Control
Circuitry
PRG
SpanTC and OffsetTC Adjust Lookup
Table with interpolation
Output Coarse
Gain Adjust
(2 to 9)
2x2 Multiplexer
Int/Ext
Feedback
PGA309
+5V
Test Logic
Fault Conditions
Monitoring Circuit
Temp ADC
Signals Mux
Temperature
ADC
Linearization
DAC
Fault
Out
Fine Gain
Adjust
Fine Offset
Adjust
Front-End
PGA Out
TEST
Fault Out
SDA
SCL
Temperature ADC
Input Select
Internal
Temp Sense
Zero
DAC
Gain
DAC
Output
Amp
+5V
S
V
SD
V
REF
V
FB
V
FB
R
TEMP
GND
A
GND
D
V
FB
V
SJ
V
OUT
V
EXC
TEMP
IN
V
IN1
V
IN2
V
TEMP
V
OS
V
OUT
V
OUT
V
OUT FILT
K
LIN
K
REF
V
SA
REF
IN
/REF
OUT
R
ISO
100W
R
FB
100W
Power-On
Reset
Band-Gap
Voltage
Reference
Two-Wire
EEPROM
(SOT23-5)
Over-/Under-
Scale Limits
Front-End PGA
(Gain 4 to 128)
C
L
10nF
C
F
150pF
Bridge
Sensor
Coarse
Offset Adjust
PGA309
SBOS292C –DECEMBER 2003–REVISED JANUARY 2011 www.ti.com
Figure 24. Simplified Diagram of the PGA309 in a Typical Configuration
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