PRELIMINARY TECHNICAL DATA
±
0.5°CAccurateDigitalTemperatureSensorand
Quad Voltage Output 12/10/8-Bit DAC
a
Preliminary Technical Data
ADT7316/7317/7318
FEATURES
G E NE R AL D E S C R IP T IO N
ADT7316 - Four 12-Bit DACs
ADT7317 - Four 10-Bit DACs
ADT7318 - Four 8-Bit DACs
T he AD T 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
0.25oC. 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 2VREF , 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 SPIT M , QSPIT M, MICROWIRET M and
DSP interface standards; and a two-wire SMBus/I2C in-
terface. It features a standby mode that is controlled via
the serial interface.
Buffered Voltage Output
Guaranteed Monotonic By Design Over All Codes
10-Bit Tem perature to Digital Converter
Tem perature range:
-40oC to +125oC
Tem perature Sensor Accuracy of ±0.5oC
Supply Range : + 2.7 V to + 5.5 V
DAC Output Range: 0 - 2VREF
Pow er-Dow n Current 1µA
Internal 2.25 VRef Option
Double-Buffered Input Logic
Buffered / Unbuffered Reference Input Option
Pow er-on Reset to Zero Volts
Sim ultaneous Update of Outputs (LDAC Function)
On-Chip Rail-to-Rail Output Buffer Am plifier
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
AD T 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.
I2C , SPITM, QSPITM, MICROWIRETM and DSP-Com patible 4-
w ire Serial Interface
16-Lead QSOP Package
APPLICATIONS
Portable Battery Pow ered Instrum ents
Personal Com puters
Telecom m unications System s
Electronic Test Equipm ent
Dom estic Appliances
T he ADT 7316/7317/7318’s wide supply voltage range,
low supply current and SPI/I2C-compatible interface,
make it ideal for a variety of applications, including per-
sonal computers, office equipment and domestic appli-
ances.
Process Control
ADDRESS POINTER
REGISTER
ON-CHIP
TEMPERATURE
SENSOR
INTERNAL TEMPERATURE
VALUE REGISTER
STRING
DAC A
DAC A
REGISTERS
VOUT-A
2
THIGH LIMIT
REGISTERS
T
LOW LIMIT
VDD
D+
D-
7
8
A-TO-D
CONVERTER
REGISTERS
ANALOG
MUX
LIMIT
COMPARATOR
DAC B
REGISTERS
STRING
DAC B
VALUE
REGISTER
VOUT-B
1
V
DD Limit
REGISTERS
CONTROL CONFIG. 1
REGISTER
DAC C
REGISTERS
STRING
DAC C
VDD
EXTERNAL TEMPERATURE
VALUE REGISTER
VOUT-C
16
15
SENSOR
CONTROL CONFIG. 2
REGISTER
STRING
DAC D
DAC D
REGISTERS
VOUT-D
CONTROL CONFIG. 3
REGISTER
DAC CONFIGURATION
REGISTER
GAIN
SELECT
LOGIC
POWER
DOWN
LOGIC
ADT7316/17/18
LDAC CONFIGURATION
REGISTER
STATUS
REGISTERS
INTERRUPT MASK
REGISTERS
INT/INT
10
SMBus/SPI INTERFACE
INTERNAL
REFERENCE
14
3
9
6
VDD
5
GND
11
4
13
12
VREF-CD
VREF-AB
LDAC
DOUT/ADD
SDA/DIN
SCL/SCLK
CS
I2C is
SPI and QSPI are trademarks of M otorola, IN C .
M IC ROWIRE is trademark of N ational 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
a registered trademark of Philips C orporation
FUNCTIO NAL BLO CK D IAGRAM
a
REV. Pr. O 01/’03
:
6 , 1 6 9 , 4 4 2
5 , 8 6 7 , 0 1 2
6 , 0 9 7 , 2 3 9
5 , 7 6 4 1 7 4
U S P atent P ending
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fa x: 781/ 326-8703
World Wide Web Site: http:/ / w w w.analog.com
Analog Devices, Inc., 2003
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