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DAC161P997 の電気的特性と機能

DAC161P997のメーカーはNational Semiconductorです、この部品の機能は「Single-Wire 16-bit DAC」です。


製品の詳細 ( Datasheet PDF )

部品番号 DAC161P997
部品説明 Single-Wire 16-bit DAC
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 




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DAC161P997 Datasheet, DAC161P997 PDF,ピン配置, 機能
DAC161P997
August 2, 2011
Single-Wire 16-bit DAC for 4-20mA Loops
1.0 General Description
The DAC161P997 is a 16- bit Δ digital-to-analog converter
(DAC) for transmitting an analog output current over an in-
dustry standard 4-20 mA current loop. It offers 16-bit accuracy
with a low output current temperature coefficient (29ppm/°C)
and excellent long-term output current drift (90 ppmFS) while
consuming less than 190µA.
The data link to the DAC161P997 is a Single Wire Interface
(SWIF) which allows sensor data to be transferred in digital
format over an isolation boundary using a single isolation
component. The DAC161P997’s digital input is compatible
with standard isolation transformers and optocouplers. Error
detection and handshaking features within the SWIF protocol
ensure error free communication across the isolation bound-
ary. For applications where isolation is not required, the
DAC161P997 interfaces directly to a microcontroller.
The loop drive of the DAC161P997 interfaces to a HART
(Highway Addressable Remote Transducer) modulator, al-
lowing injection of FSK modulated digital data into the 4-20mA
current loop. This combination of specifications and features
makes the DAC161P997 ideal for 2- and 4-wire industrial
transmitters.
The DAC161P997 is available in a 16–lead LLP package and
is specified over the extended industrial temperature range of
-40°C to 105°C.
2.0 Applications
• Two-wire, 4-20 mA current loop transmitter
• Industrial Process Control
• Actuator control
• Factory Automation
• Building Automation
• Precision Instruments
• Data Acquisition Systems
• Test Systems
3.0 Features
16-bit linearity
Single-Wire Interface (SWIF), with handshake
Digital Data transmission (no loss of fidelity)
Pin Programmable Power-Up Condition
Self adjusting to input data rate
Loop error detection and reporting
Programmable output current error level
No external precision components
Simple interface to HART modulator
Small package: LLP-16 (4x4 mm, 0.5 mm pitch)
4.0 Key Specifications
Output Current TempCohttp://www.DataSheet4U.net/
Long-Term Output Current Drift
INL
Total Supply Current
29 ppmFS/°C(max)
90 ppmFS(typ)
+3.3/−2.1 µA(max)
190 µA(max)
5.0 Typical Application - Conceptual Schematic
National Semiconductor® is a registered trademark of National Semiconductor Corporation.
© 2011 National Semiconductor Corporation 301544
30154401
www.national.com
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DAC161P997 pdf, ピン配列
7.0 Functional Overview
7.1 4-20 mA CURRENT LOOP TRANSMITTER
The DAC161P997 is a 16-bit DAC realized as a Δ modula-
tor. The DAC’s output is a current pulse train that is filtered by
the on-board low pass RC filter. The final output current is a
multiplied copy of the filtered modulator output. This architec-
ture guarantees an excellent linearity performance, while min-
imizing power consumption of the device.
The DAC161P997 eases the design of robust, precise, long-
term stable industrial systems by integrating all precision
elements on-chip. Only a few external components are need-
ed to realize a low-power, high-precision industrial
4 - 20 mA transmitter.
In case of a fault, or during initial power-up the DAC161P997
will output current in either upper or lower error current band.
The choice of band is user selectable via a device pin. The
error current value is user programmable via the SWIF link by
the Master.
7.2 SINGLE-WIRE INTERFACE (SWIF)
SWIF is a versatile and robust solution for transmitting digital
data over the galvanic isolation boundary using just one iso-
lation element: a pulse transformer.
Digital data format achieves the information transmission
without the loss of fidelity which usually afflicts transmissions
employing PWM (Pulse Width Modulation) schemes. Digital
transmission format also makes possible data differentiation:
user can specify whether given data word is a DAC input to
be converted to loop current, or it is a device configuration
word.
8.0 Connection Diagram
SWIF was designed to use in conjunction with pulse trans-
former as an isolation element. The use of the transformers
to cross the isolation boundary is typical in the legacy systems
due to their robustness, low-power consumption, and low
cost. However, system implementation is not limited to the
transformer as a link since SWIF easily interfaces with opto-
couplers, or it can be directly driven by a CMOS gate.
SWIF incorporates a number of features that address robust-
ness aspect of the data link design:
1. Bidirectional signal flow: the DAC161P997 can issue an
ACKNOWLEDGE pulse back to the master transmitter,
via the same physical channel, to confirm the reception
of the valid data;
2. Error Detection: SWIF protocol incorporates frame length
detection and parity checks as a method of verifying the
integrity of the received data;
3. Channel Activity Detection: SWIF can monitor the data
channel and raise an error flag should the expected
activity drop below programmable threshold, due to , for
example, damage to the physical channel.
In the typical system the Master is a micro controller. SWIF
has been implemented on a number of popular micro con-
trollers where it places minimum demands on the hardware
or software resources even of the simple 8-bit devices.
SWIF gives the system designer flexibility is balancing the
trade-offs between the data rate, activity monitoring function-
ality and the power consumption in the transformer coupled
data channel. At lowest data rates, with long inactive inter-
frame periods, the power consumed by SWIF is negligible.
See Section 17.2.2 Inter-Frame Period
http://www.DataSheet4U.net/
LLP-16 (SQ16A)
Top View
30154403
3
www.national.com
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3Pages


DAC161P997 電子部品, 半導体
11.0 Absolute Maximum Ratings (Note
1, Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply relative to common (VA, VD to
COMA, COMD)
Voltage between any 2 pins(Note 3)
Current IN or OUT of any pin - except
OUT (Note 3)
Output current at OUT
Junction Temperature
Storage Temperature Range
ESD Susceptibility
(Note 4) Human Body Model
Machine Model
Charged Device Model
−0.3V to 6.0V
6.0V
5 mA
50 mA
+150°C
−65°C to +150°C
5500V
500V
1250V
12.0 Operating Conditions (Note 1, Note
2)
Operating Temperature (TA)
Supply Voltage Range
(VA - VD)
(COMA - COMD)
BASE load to COMA
OUT load to COMA
−40°C to 105°C
2.7V to 3.6V
0V
0V
0 to 15 pF
none
Package
LLP16
θJA
35°C/W
For Soldering specifications:
See product folder at www.national.com
www.national.com/ms/MS-SOLDERING.pdf.
and
13.0 Electrical Characteristics
Unless otherwise noted, these specifications apply for VA = VD = 2.7V to 3.6V, TA=25°C, external bipolar transitor: 2N3904,
RE=22Ω, C1=C2=C3=2.2nF. Boldface limits are over the temperature range of −40°C TA 105°C unless otherwise noted.
Symbol
Parameter
Conditions
Min Typ Max Units
POWER SUPPLY
VA, VD Supply Voltage
VA = VD
2.7
3.6 V
VA Supply Current
75 µA
VD Supply Current
DACCODE=0x0200 (Note 5)
115 µA
Total Supply Current
190 µA
Power On Reset supply rail
VPOR potential threshold
http://www.DataSheet4U.net/
DC ACCURACY
1.3
1.9 V
N Resolution
16 Bits
INL
DNL
Integral Non-Linearity
Differential Non-Linearity
0x2AAA<DACCODE<0xD555
(4mA<ILOOP<20 mA)
(Note 10)
–2.1
–0.2
+3.3
µA
+0.2
TUE Total Unadjusted Error
0x2AAA<DACCODE<0xD555
–0.23
+0.23
%FS
OE Offset Error
(Note 6)
−9.16
+9.16
µA
Offset Error Temp. Coefficient
138 nA/°C
GE Gain Error
(Note 7)
−0.22
0.22 %FS
Gain Error Temp. Coefficient
5 29 ppmFS/°C
4mA Loop Current Error
DACCODE = 0x2AAA
−18
+18
20 mA Loop Current Error
IERRL LOW ERROR Current
DACCODE = 0xD555
ERR_LOW = default
−55
3361
3375
+55
3391
µA
IERRH HIGH ERROR Current
ERR_HIGH = default
21702
21750
21817
Long Term Drift — mean shift of
LTD 12 mA output current after 1000
hrs at 150°C
90 ppmFS
LOOP CURRENT OUTPUT (OUT)
Output Current
Minimum tested at DACCODE =
0x01C2 (Note 8)
0.18
24 mA
Output Impedance
100 M
COMA to OUT voltage drop
IOUT = 24 mA
BASE OUTPUT
960 mV
BASE short circuit output current BASE forced to COMA potential
10
mA
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6
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共有リンク

Link :


部品番号部品説明メーカ
DAC161P997

DAC161P997 Single-Wire 16-bit DAC for 4- to 20-mA Loops (Rev. G)

Texas Instruments
Texas Instruments
DAC161P997

Single-Wire 16-bit DAC

National Semiconductor
National Semiconductor
DAC161P997-DIE

Single-Wire 16-bit DAC DAC161P997-DIE

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Texas Instruments


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