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±0.5°C Accurate Digital Temperature Sensor

and Quad Voltage Output 12-/10-/8-Bit DACs

ADT7316/ADT7317/ADT7318

Rev. A

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

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 V

REF

Power-down current 1 µA

Internal 2.28 V

REF

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

C®, 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-006

ADT7316/

ADT7317/

ADT7318

TOP VIEW

(Not to Scale)

OUT

-B

OUT

-C

OUT

-A

OUT

-D

REF

-AB

REF

-CD

SCL/SCLK

GND

SDA/DIN

DOUT/ADD

D+

INT/INT

D–

LDAC

Figure 1.

GENERAL DESCRIPTION

The ADT7316/ADT7317/ADT7318

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 V

REF

, 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/I

C 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/I

C 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.

ADT7316/ADT7317/ADT7318

Rev. A | Page 2 of 40

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

Ter mi no lo g y .................................................................................... 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

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

C 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 V

REF

Value Change................................................... Universal

Change to Equation in Thermal Voltage Output Section ..............21

Changes to Outline Dimensions........................................................40

8/03—Initial Version: Rev.0

ADT7316/ADT7317/ADT7318

Rev. A | Page 3 of 40

SPECIFICATIONS

Table 1. Temperature ranges are as follows: A Version: –40°C to +120°C. V

= 2.7 V to 5.5 V, GND = 0 V, REF

= 2.25 V, unless

otherwise noted.

Parameter

Min Typ Max Unit Conditions/Comments

DAC DC PERFORMANCE

2,3

ADT7318

Resolution 8 Bits

Relative Accuracy ±0.15 ±1 LSB

Differential Nonlinearity ±0.02 ±0.25 LSB Guaranteed monotonic over all codes.

ADT7317

Resolution 10 Bits

Relative Accuracy ±0.5 ±4 LSB

Differential Nonlinearity ±0.05 ±0.5 LSB Guaranteed monotonic over all codes.

ADT7316

Resolution 12 Bits

Relative Accuracy ±2 ±16 LSB

Differential Nonlinearity ±0.02 ±0.9 LSB Guaranteed monotonic over all codes.

Offset Error ±0.4 ±2 % of FSR

Gain Error ±0.4 ±2 % of FSR

Lower Dead Band 20 65 mV Lower dead band exists only if offset error is negative. See

Figure 2.

Upper Dead Band 60 100 mV Upper dead band exists if V

REF

= V

and offset plus gain

error is positive. See

Figure 3.

Offset Error Drift

−12

ppm of

FSR/°C

Gain Error Drift

−5

ppm of

FSR/°C

DC Power Supply Rejection Ratio

−60

∆V

= ±10%.

DC Crosstalk 200 µV

See

Figure 6.

THERMAL CHARACTERISTICS

INTERNAL TEMPERATURE SENSOR

Internal reference used. Averaging on.

Accuracy at V

= 3.3 V ±10% ±1.5 °C T

= 85°C.

±0.5 ±3 °C T

= 0°C to +85°C.

±2 ±5 °C

= −40°C to +120°C.

Accuracy at V

= 5 V ±5% ±2 ±3 °C T

= 0°C to +85°C.

±3 ±5 °C

= −40°C to +120°C.

Resolution 10 Bits Equivalent to 0.25°C.

Long Term Drift 0.25 °C Drift over 10 years if part is operated at 55°C.

EXTERNAL TEMPERATURE SENSOR External Transistor = 2N3906.

Accuracy at V

= 3.3 V ±10% ±1.5 °C T

= 85°C.

±3 °C T

= 0°C to +85°C.

±5 °C

= −40°C to +120°C.

Accuracy at V

= 5 V ±5% ±2 ±3 °C T

= 0°C to +85°C.

±3 ±5 °C

= −40°C to +120°C.

Resolution 10 Bits Equivalent to 0.25°C.

Output Source Current 180 µA High level.

11 µA Low level.

Thermal Voltage Output

8-Bit DAC Output

Resolution 1 °C

Scale Factor 8.79 mV/°C

0 V to V

REF

Output. T

= −40°C to +120°C.

17.58 mV/°C

0 V to 2 V

REF

Output. T

= −40°C to +120°C.

See . Terminology

DC specifications tested with the outputs unloaded.

Linearity is tested using a reduced code range: ADT7316 (code 115 to 4095); ADT7317 (code 28 to 1023); ADT7318 (code 8 to 255).

ADT7316/ADT7317/ADT7318

Rev. A | Page 4 of 40

Parameter

Min Typ Max Unit Conditions/Comments

10-Bit DAC Output

Resolution 0.25 °C

Scale Factor 2.2 mV/°C

0 V to V

REF

Output. T

= −40°C to +120°C.

4.39 mV/°C

0 V to 2 V

REF

Output. T

= −40°C to +120°C.

CONVERSION TIMES Single Channel Mode.

Slow ADC

11.4 ms Averaging (16 samples) on.

712 µs Averaging off.

Internal Temperature 11.4 ms Averaging (16 samples) on.

712 µs Averaging off.

External Temperature 24.22 ms Averaging (16 samples) on

1.51 ms Averaging off.

Fast ADC

712 µs Averaging (16 samples) on.

44.5 µs Averaging off.

Internal Temperature 2.14 ms Averaging (16 samples) on.

134 µs Averaging off.

External Temperature 14.25 ms Averaging (16 samples) on.

890 µs Averaging off.

ROUND ROBIN UPDATE RATE

Time to complete one measurement cycle through all

channels.

Slow ADC at 25°C

Averaging On 59.95 ms

Averaging Off 6.52 ms

Fast ADC at 25°C

Averaging On 19.59 ms

Averaging Off 2.89 ms

DAC EXTERNAL REFERENCE INPUT

REF

Input Range 1 V

V Buffered reference mode.

REF

Input Range 0.25 V

V Unbuffered reference mode.

REF

Input Impedance 37 45

kΩ

Unbuffered reference mode.

0 V to 2 V

REF

output range.

74 90

kΩ

Unbuffered reference mode.

0 V to V

REF

output range.

>10

MΩ

Buffered reference mode and power-down mode.

Reference Feedthrough

−90

dB Frequency = 10 kHz.

Channel-to-Channel Isolation

−75

dB Frequency = 10 kHz.

ON-CHIP REFERENCE

Reference Voltage

2.28 V

Temperature Coefficient

80 ppm/C

OUTPUT CHARACTERISTICS

Output Voltage

0.001 V

0.001

V This is a measure of the minimum and maximum drive

capability of the output amplifier.

DC Output Impedance 0.5

Ω

Short Circuit Current 25 mA V

= 5 V.

16 mA V

= 3 V.

Power-Up Time 2.5 µs Coming out of power-down mode. V

= 5 V.

5 µs Coming out of power-down mode. V

= 3.3 V.

Round robin is the continuous sequential measurement of the following three channels: V

, internal temperature, and external temperature.

Guaranteed by design and characterization, but not production tested.

In order for the amplifier output to reach its minimum voltage, the offset error must be negative. In order for the amplifier output to reach its maximum voltage, V

REF

, offset plus gain error must be positive.

ADT7316/ADT7317/ADT7318

Rev. A | Page 5 of 40

Parameter

Min Typ Max Unit Conditions/Comments

DIGITAL INPUTS

Input Current ±1 µA V

= 0 V to V

Input Low Voltage, V

0.8 V

Input High Voltage, V

1.89 V

Pin Capacitance 3 10 pF All digital inputs.

SCL, SDA Glitch Rejection 50 ns Input filtering suppresses noise spikes of less than 50 ns.

LDAC

Pulse Width

20 ns Edge triggered input.

DIGITAL OUTPUT

Output High Voltage, V

2.4 V I

SOURCE

= I

SINK

= 200 µA.

Output Low Voltage, V

0.4 V I

= 3 mA.

Output High Current, I

1 mA V

= 5 V.

Output Capacitance, C

OUT

50 pF

INT/

INT

Output Saturation Voltage

0.8 V I

OUT

= 4 mA.

C TIMING CHARACTERISTICS

7,8

Serial Clock Period, t

2.5 µs

Fast-mode I

C. See Figure 4.

Data In Setup Time to SCL High, t

50 ns

Data Out Stable after SCL Low, t

0 ns

See

Figure 4.

SDA Low Setup Time to SCL Low (Start

Condition), t

50 ns

See

Figure 4.

SDA High Hold Time after SCL High

(Stop Condition), t

50 ns

See

Figure 4.

SDA and SCL Fall Time, t

90 ns

See

Figure 4.

SPI TIMING CHARACTERISTICS

9,10

to SCLK Setup Time, t

0 ns

See

Figure 7.

SCLK High Pulse Width, t

50 ns

See

Figure 7.

SCLK Low Pulse, t

50 ns

See

Figure 7.

Data Access Time after SCLK Falling

Edge, t

35 ns

See

Figure 7.

Data Setup Time Prior to SCLK Rising

Edge, t

20 ns

See

Figure 7.

Data Hold Time after SCLK Rising

Edge, t

0 ns

See

Figure 7.

to SCLK Hold Time, t

0 ns

See

Figure 7.

to DOUT High Impedance, t

40 ns

See

Figure 7.

POWER REQUIREMENTS

2.7 5.5 V

Settling Time 50 ms V

settles to within 10% of its final voltage level.

(Normal Mode)

3 mA V

= 3.3 V, V

= V

and V

= GND.

2.2 3 mA V

= 5 V, V

= V

and V

= GND.

(Power Down Mode) 10 µA V

= 3.3 V, V

= V

and V

= GND.

10 µA V

= 5 V, V

= V

and V

= GND.

Power Dissipation 10 mW V

= 3.3 V. Using Normal Mode.

33 µW V

= 3.3 V. Using Shutdown Mode.

The SDA and SCL timing is measured with the input filters turned on so as to meet the fast-mode I

C specification. Switching off the input filters improves the transfer

rate but has a negative effect on the EMC behavior of the part.

Guaranteed by design. Not tested in production.

Guaranteed by design and characterization, but not production tested.

All input signals are specified with tr = tf = 5 ns (10% to 90% of V

) and timed from a voltage level of 1.6 V.

Measured with the load circuit of . Figure 5

specification is valid for all DAC codes. Interface inactive. All DACs active. Load currents excluded.

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