參數(shù)資料
型號： AD7318
英文描述： Dual and Quad 45MHz, 400V/µs Op Amps; Package: PDIP; No of Pins: 14; Temperature Range: 0°C to +70°C
文件頁數(shù)： 1/34頁
文件大?。?/td> 272K
代理商： AD7318
ADT7316/7317/7318
a
REV. Pr. O 01/’03
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, PO. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2003
±
0.5°C Accurate Dgital Temperature Sensor and
Quad Voltage Output 12/10/8-Bit DAC
Prelimnary Technical Data
PRELIMINARY TECHNICAL DATA
FEATURES
ADT7316 - Four 12-Bit DACs
ADT7317 - Four 10-Bit DACs
ADT7318 - Four 8-Bit DACs
Buffered Voltage Output
Guaranteed Monotonic By Design Over All Codes
10-Bit Temperature to Digital Converter
Temperature range:
Temperature Sensor Accuracy of ±0.5
o
C
Supply Range : + 2.7 V to + 5.5 V
-40
o
C to +125
o
C
DAC Output Range: 0 - 2V
REF
Power-Down Current 1
μ
A
Internal 2.25 V
Ref
Option
Double-Buffered Input Logic
Buffered / Unbuffered Reference Input Option
Power-on Reset to Zero Volts
Simultaneous Update of Outputs (
LDAC
Function)
On-Chip Rail-to-Rail Output Buffer Amplifier
I
2
C
, SPI
TM
, QSPI
TM
, MICROWIRE
TM
and DSP-Compatible 4-
wire Serial Interface
16-Lead QSOP Package
APPLICATIONS
Portable Battery Powered Instruments
Personal Computers
Telecommunications Systems
Electronic Test Equipment
Domestic Appliances
Process Control
G E NE R A L D E SC R IP T ION
T he ADT 7316/7317/7318 combines a 10-Bit T empera-
ture-to-Digital Converter and a quad 12/10/8-Bit DAC
respectively, in a 16-Lead QSOP package. T his includes a
bandgap temperature sensor and a 10-bit ADC to monitor
and digitize the temperature reading to a resolution of
0.25
o
C. T he ADT 7316/17/18 operates from a single
+2.7V to +5.5V supply. T he output voltage of the DAC
ranges from 0 V to 2V
REF
, with an output voltage settling
time of typ 7 msec. T he ADT 7316/17/18 provides two
serial interface options, a four-wire serial interface which
is compatible with SPI
T M
, QSPI
T M
, MICROWIRE
T M
and
DSP interface standards; and a two-wire SMBus/I
2
C in-
terface. It features a standby mode that is controlled via
the serial interface.
T he reference for the four DACs is derived either inter-
nally or from two reference pins (one per DAC pair) .T he
outputs of all DACs may be updated simultaneously using
the software
LDAC
function or external LDAC pin. T he
ADT 7316/7317/7318 incorporates a power-on-reset cir-
cuit, which ensures that the DAC output powers-up to
zero volts and it remains there until a valid write takes
place.
T he ADT 7316/7317/7318’s wide supply voltage range,
low supply current and SPI/I
2
C-compatible interface,
make it ideal for a variety of applications, including per-
sonal computers, office equipment and domestic appli-
ances.
F UNC T IONAL BL OC K DIAGRAM
I
2
C is a registered trademark of Philips C orporation
SPI and QSPI are trademarks of Motorola, INC .
MIC ROWIRE is a trademark of National Semiconductor C orporation.
T he AD T 7316/7317/7318 is protected by the following U .S. patent
numbers and by other intellectual property rights :
6,169,442
6,097,239
5,867,012
5,764174
U S Patent Pending
V
DD
RVALUE
STRING
DAC B
EXTERNAL TEMPERATURE
VALUE REGISTER
A-TO-D
CONVERTER
INTERNAL TEMPERATURE
VALUE REGISTER
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
D
LIMIT
COMPARATOR
D
DAC C
REGISTERS
ADDRESS POINTER
REGISTER
T
HIGH
LIMIT
REGISTERS
T
LOW
LIMIT
REGISTERS
V
DD
Limit
REGISTERS
CONTROL CONFIG. 1
REGISTER
CONTROL CONFIG. 3
REGISTER
CONTROL CONFIG. 2
REGISTER
DAC CONFIGURATION
REGISTER
LDAC CONFIGURATION
REGISTER
INTERRUPT MASK
REGISTERS
RDAC A
DAC B
REGISTERS
DAC D
REGISTERS
STRING
DAC A
STRING
DAC C
STRING
DAC D
GAIN
SELECT
LOGIC
POWER
DOWN
LOGIC
V
OUT
-A
V
OUT
-B
V
OUT
-C
V
OUT
-D
D+
D-
SMBus/SPI INTERFACE
CS
SCL/SCLK
SDA/DIN
DOUT/ADD
INT/INT
RSTATUS
V
DD
SENSOR
V
DD
GND
INTERNAL
REFERENCE
V
REF
-AB
V
REF
-CD
LDAC
ADT7316/17/18
7
8
6
5
4
13
12
11
9
3
14
10
15
16
1
2
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