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ADT7318ARQ-ADT7318ARQZ-REEL7
SPI/I2C® Compatible,10-Bit Digital Temperature Sensor and Quad Voltage Output 12-Bit DAC
±0.5°C Accurate Digital Temperature Sensor
and Quad Voltage Output 12-/10-/8-Bit DACs
Rev. A
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°C to +120°C
Temperature sensor accuracy of ±0.5°C
Supply range: 2.7 V to 5.5 V
DAC output range: 0 V to 2 VREF
Power-down current 1 µA
Internal 2.28 VREF option
Double-buffered input logic
Buffered/unbuffered reference input option
Power-on reset to 0 V
Simultaneous update of outputs (LDAC function)
On-chip rail-to-rail output buffer amplifier 2C®, SMBus, SPI®, QSPI™, MICROWIRE™, and DSP compatible
4-wire serial interface
SMBus packet error checking (PEC) compatible
16-lead QSOP package
APPLICATIONS
Portable battery-powered instruments
Personal computers
Telecommunications systems
Electronic test equipment
Domestic appliances
Process control
PIN CONFIGURATION 02661-A
VOUT-BVOUT-C
VOUT-AVOUT-DVREF-CDSCL/SCLK
GNDSDA/DIN
VDDDOUT/ADDINT/INTLDAC
Figure 1.
GENERAL DESCRIPTIONThe ADT7316/ADT7317/ADT73181 combine a 10-bit temp-
erature-to-digital converter and a quad 12-/10-/8-bit DAC,
respectively, in a 16-lead QSOP package. This includes a band
gap temperature sensor and a 10-bit ADC to monitor and
digitize the temperature reading to a resolution of 0.25°C. The
ADT7316/ADT7317/ADT7318 operate from a single 2.7 V to
5.5 V supply. The output voltage of the DAC ranges from 0 V to
2 VREF, with an output voltage settling time of typ 7 ms. The
ADT7316/ADT7317/ADT7318 provide two serial interface
options, a 4-wire serial interface that is compatible with SPI,
QSPI, MICROWIRE, and DSP interface standards, and a 2-wire
SMBus/I2C interface. They feature a standby mode that is
controlled via the serial interface.
The reference for the four DACs is derived either internally 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/ADT7317/
ADT7318 incorporate a power-on-reset circuit that ensures the
DAC output powers up to 0 V and remains there until a valid
write takes place.
The ADT7316/ADT7317/ADT7318’s wide supply voltage range,
low supply current, and SPI/I2C compatible interface make
them ideal for a variety of applications, including personal
computers, office equipment, and domestic appliances.
Protected by the following U.S. patent numbers: 5,764,174; 5,867,012;
6,097,239; 6,169,442. Other patents pending.
TABLE OF CONTENTS Specifications.....................................................................................3
Functional Block Diagram..............................................................7
DAC AC Characteristics..................................................................8
Absolute Maximum Ratings............................................................9
ESD Caution..................................................................................9
Pin Configuration and Function Descriptions...........................10
Terminology....................................................................................11
Typical Performance Characteristics...........................................13
Theory of Operation......................................................................18
Power-Up Calibration................................................................18
Conversion Speed.......................................................................18
Functional Description—Voltage Output...................................19
Digital-to-Analog Converters...................................................19
Digital-to-Analog Section.........................................................19
Resistor String.............................................................................19
DAC External Reference Inputs...............................................19
Output Amplifier........................................................................20
Thermal Voltage Output............................................................20
Functional Description—Measurement......................................22
Temperature Sensor...................................................................22
VDD Monitoring..........................................................................22
On-Chip Reference....................................................................23
Round Robin Measurement......................................................23
Single-Channel Measurement..................................................23
Temperature Measurement Method........................................23
Temperature Value Format.......................................................24
Interrupts.....................................................................................25
Registers...........................................................................................26
Serial Interface................................................................................34
Serial Interface Selection...........................................................34 2C Serial Interface.....................................................................34
SPI Serial Interface.....................................................................35
Layout Considerations...................................................................39
Outline Dimensions.......................................................................40
Ordering Guide..........................................................................40
REVISION HISTORY
6/04—Data Sheet Changed from Rev. 0 to Rev. A Updated Format......................................................................Universal
Internal VREF Value Change...................................................Universal
Change to Equation in Thermal Voltage Output Section..............21
Changes to Outline Dimensions........................................................40
8/03—Initial Version: Rev.0
SPECIFICATIONS
Table 1. Temperature ranges are as follows: A Version: –40°C to +120°C. VDD = 2.7 V to 5.5 V, GND = 0 V, REFIN = 2.25 V, unless
otherwise noted. Round robin is the continuous sequential measurement of the following three channels: VDD, internal temperature, and external temperature.
5Guaranteed by design and characterization, but not production tested.
7The SDA and SCL timing is measured with the input filters turned on so as to meet the fast-mode I2C specification. Switching off the input filters improves the transfer
rate but has a negative effect on the EMC behavior of the part.
8Guaranteed by design. Not tested in production. Guaranteed by design and characterization, but not production tested.
10All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V. Measured with the load circuit of . Figure 5
12IDD specification is valid for all DAC codes. Interface inactive. All DACs active. Load currents excluded.
