ADT7316/7317/7318
G61
REV. PrN 02/02
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, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 Analog Devices, Inc., 2002
SPI/I
2
C

Compatible, 10-Bit Digital Temperature
Sensor and Quad Voltage Output 12/10/8-Bit DAC
Preliminary 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: -40
o
C to +125
o
C
Temperature Sensor Accuracy of ±0.5
o
C
Supply Range : + 2.7 V to + 5.5 V
DAC Output Range: 0 - 2V
REF
Power-Down Current 1µA
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 (G4CG44G41G43G20Function)
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
GENERAL DESCRIPTION
The ADT7316/7317/7318 combines a 10-Bit Tempera-
ture-to-Digital Converter and a quad 12/10/8-Bit DAC
respectively, in a 16-Lead QSOP package. This 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. The ADT7316/17/18 operates from a single
+2.7V to +5.5V supply. The output voltage of the DAC
ranges from 0 V to 2V
REF
, with an output voltage settling
time of typ 7 msec. The ADT7316/17/18 provides two
serial interface options, a four-wire serial interface which
is compatible with SPI
TM
, QSPI
TM
, MICROWIRE
TM
and
DSP interface standards; and a two-wire I
2
C interface. It
features a standby mode that is controlled via the serial
interface.
The reference for the four DACs is derived either inter-
nally or from two reference pins (one per DAC pair) .The
outputs of all DACs may be updated simultaneously using
the software LDAC function or external LDAC pin. The
ADT7316/7317/7318 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.
The ADT7316/7317/7318’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.
I
2
C is a registered trademark of Philips Corporation
* Protected by U.S. Patent No. 5,969,657; other patents pending.
SPI and QSPI are trademarks of Motorola, INC.
MICROWIRE is a trademark of National Semiconductor Corporation.
FUNCTIONAL BLOCK DIAGRAM
V
DD
VALUE
REGISTER
STRING
DA C B
EXTERNAL TEMPERATURE
VALUE REGISTER
A-TO-D
CONVERTER
INTERNAL TEMPERATURE
VALUE REGISTER
ON-CHIP
TEMPERATURE
SENSOR
ANALOG
MUX
D
I
G
I
T
A
L
M
U
X
LIMIT
COMPARATOR
D
I
G
I
T
A
L
M
U
X
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
DAC A
REGISTERS
DA C B
REGISTERS
DAC D
REGISTERS
STRING
DAC A
STRING
DA C C
STRING
DA C D
GAIN
SELECT
LOGIC
POWER
DOWN
LOGIC
V
OUT
-A
V
OUT
-B
V
OUT
-C
V
OUT
-D
D+
D-
SMB us/SPI INTERFACE
G43G53 SCL/SCLK SDA/DIN DOUT/ADD
INTERRUPT
STATUS
REGISTERS
V
DD
SENSOR
V
DD
GND
INTERNAL TEMP
SENSOR
VREF-A B VREF-CDG4CG44G41G43
ADT7316/17/18
7
8
6 5
4 13 12 11
9 3
14
10
15
16
1
2