LTC1658CS8#PBF Linear Technology, LTC1658CS8#PBF Datasheet - Page 9
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LTC1658CS8#PBF
Manufacturer Part Number
LTC1658CS8#PBF
Description
IC D/A CONV 14BIT R-R 8-SOIC
Manufacturer
Linear Technology
Datasheet
1.LTC1658CS8PBF.pdf
(12 pages)
Specifications of LTC1658CS8#PBF
Settling Time
12µs
Number Of Bits
14
Data Interface
Serial
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
3mW
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Number Of Channels
1
Resolution
14b
Interface Type
Serial (3-Wire, SPI, Microwire)
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Output Type
Voltage
Integral Nonlinearity Error
±8LSB
Single Supply Voltage (min)
2.7V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
This circuit shows how to use an LTC1658 to make an
optoisolated digitally controlled 4mA to 20mA process
controller. The controller circuitry, including the
optoisolation, is powered by the loop voltage that can have
a wide range of 3.8V to 30V. The 3.3V output of the
LT1121-3.3 is used for the 4mA offset current and V
TYPICAL APPLICATIO S
CS/LD
CLK
D
IN
IN
LT
®
1121-3.3
OUT
ISOLATED
OPTOISOLATORS
INPUTS
500
OPTO-
FROM
+
1 F
U
4N28
CLK
D
CS/LD
An Optoisolated 4mA to 20mA Process Controller
IN
V
3.3V
CC
LTC1658
3.6k
REF
CLK
D
CS/LD
IN
V
OUT
OUT
is
60.4k
237k
1%
1%
used for the digitally controlled 0mA to 16mA current. R
is a sense resistor and the op amp modulates the transis-
tor Q1 to provide the 4mA to 20mA current through this
resistor. The potentiometers allow for offset and full-scale
adjustment. The control circuitry dissipates well under the
4mA budget at zero-scale.
20k
5k
3.01k
1%
1658 TA04
+
–
LT1077
1k
Q1
2N3440
R
10
S
V
3.8V TO 30V
I
OUT
LOOP
LTC1658
9
S