Datasheet

XTR108
10
SBOS187C
www.ti.com
FIGURE 2. XTR108 Internal Block Diagram.
4-20mA
Voltage
Reference
Sub-Regulator
Driver
Linearization
Circuit
Multiplexer
SDIO
SCLK
CS2
CS1
V/I-0
V/I-1
V/I-2
V/I-3
V/I-4
V/I-5
RTD
R
Z1
R
Z2
R
Z3
R
Z4
R
Z5
C
FILT
0.01µF
R
CM
15.8kΩ 12.1kΩ
R
SET
R
LIN
R
VI
6.34kΩ
V
OUT
I
IN
PGA
OPA +IN
OPA –IN
OPA OUT
REF
IN
REF
OUT
Σ
V
Gate
V
S
I
O
I
RET
I
REF
DAC
I
LIN
DAC
Zero
DAC
SPI and
Control Circuits
OSC
R
LOAD
+
–
Loop
Supply
XTR108
C
GATE
C
REG
C
LOOP
Output
Current
Amplifier
12
2.5kΩ
51Ω