PGA309_05 BURR-BROWN [Burr-Brown Corporation], PGA309_05 Datasheet - Page 17

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

DETAILED BLOCK DIAGRAM
Figure 2. Detailed Block Diagram
TEMP
V
TEST
V
V
EXC
IN2
IN1
15
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IN
1
5
4
9
V
V
EXC
SA
Test Logic
PGA309
TEMP
V
V
V
REF
EXC
OUT
I
7µA
TEMP
I
TEMP
Input Mux
IN
Temp ADC Input
Control
Input Mux
Temp ADC
Mux Select
Input Mux
Enable
(with PGA Diff Amp Gain = 4)
V
PGA Gain Select (1 of 8)
EXC
GND
Range of 4 to 128
Enable
2
A
Temp Sense
Temp ADC, PGA
Internal
(x1, x2, x4, x8)
xG
Σ
GND
V
V
INP
REF
11
D
7−Bit + Sign
Lin DAC
V
Linearization and V
Offset Adjust
INN
4−Bit + Sign
Temp Select
Internal REF
Coarse
Temp ADC
DAC
Source
Gain Adjust
Fault Monitor
Circuit
R
Auto
Zero
Auto
Zero
G
15−Bit + Sign
Temp ADC
V
R
R
REF
A2
EXC
A1
F
F
Front End PGA
x0 .1 66
x0 .1 24
V
Temp ADC
REFT
Ref Mux
Alarm Register Inputs
Look− Up Logic with Interpolation Algorithm
16−Bit
Zero
DAC
Offset TC Adjust and Scan TC Adjust
R
R
Fine
Offset Adjust
Temp ADC
REF Select
V
Output Gain Select (1 of 7)
FB
Control Registers
Alarm Register
V
V
V
4R
INT/EXT FB Select
REF
EXC
SA
Diff Amp
Auto
Zero
x0.83
x0.52
PGA
Range of 2 to 9
R
REF
V
(2.5V or 4.096V)
REF
PGA Output
Front−End
A3
IN
Internal Set
/REF
16
V
Digital Controls
OUT
REF
V
(2.5V or 4.096V)
SBOS292B − DECEMBER 2003 − REVISED JANUARY 2005
REF
16−Bit
Control Circuitry
V
Gain
DAC
Internal Set
Interface and
SA
Fine Gain Adjust
(16− Bit)
V
SA
3
POR
RGO
Reference
R
Bandgap
SET
V
SD
V
V
10
V
REF
RFO
REF
SD
Amplifier
Output
Under−Scale
Over−Scale
Limit
Limit
3−Bit
3−Bit
DAC
DAC
Limiter
Scale
V
FB
PGA309
V
OUT
14
13
12
7
6
8
V
PRG
SDA
SCL
V
V
OUT
FB
SJ
17