Analog Devices ADT14 Datasheet

Quad Setpoint, Programmable

VOLTAGE

REFERENCE

AND

SENSOR

CURRENT

MIRROR

WINDOW

COMPARATORS

HYSTERESIS
VOLTAGE

TEMPERATURE
OUTPUT

HYSTERESIS

SETPOINT
OUTPUT 1

SETPOINT
OUTPUT 2

SETPOINT
OUTPUT 3

SETPOINT
OUTPUT 4

VPTAT

2.5V

V

REF

SET 1

SET 2

SET 3

SET 4

GND

V+

ADT14

a

Temperature Monitor and Controller

ADT14

FEATURES
Four Programmable Temperature Setpoints
Programmable Thermal Hysteresis
Accuracy 638C Typ from –408C to +1258C
Temperature Output Scale Factor = 5 mV/K
Resistor Programmable Temperature Setpoints
5 mA Open-Collector Setpoint Outputs
Internal 2.5 V Reference
600 mA Max Quiescent Current at +5 V

APPLICATIONS
Power Supply Monitor and Control System
Multiple Fan Controller System
Workstation Thermal Management System

GENERAL DESCRIPTION

The ADT14 is a temperature sensor and controller that generates
an output voltage proportional to temperature and provides four
temperature trip points. The four trip points, or temperature
setpoints, and their hysteresis are determined by voltage levels set
by the user. An on-chip voltage reference provides an easy method
for setting the temperature trip points.

The ADT14 consists of a bandgap voltage reference combined
with four matched comparators. The reference provides both a
temperature-stable 2.5 V output, and a voltage proportional to
absolute temperature (VPTAT) which has a precise temperature
coefficient of 5 mV/K = 5 mV/(°C +273.15). The VPTAT out­put is nominally 1.49 V at +25°C. The comparators determine
whether the VPTAT output is above the voltages set up by
external resistive dividers (temperature trip points) and generate
an open-collector output signal when one of their respective
thresholds has been exceeded.

Hysteresis is programmed by a user-selected voltage at the hys­teresis pin. This voltage adjusts the hysteresis current which is
used to generate a hysteresis offset voltage. The comparator’s
noninverting inputs are connected in parallel, which guarantees
that there is no hysteresis overlap and eliminates erratic transi­tions between adjacent trip zones.

Using a proprietary thin-film resistor process in conjunction
with production laser trimming, a temperature accuracy of ±3°C
at 25°C is guaranteed. The open-collector outputs are capable
of sinking 5 mA, and provide TTL/CMOS logic compatibility
with an external pull-up resistor. Operating from a single 5 V
supply, the quiescent current is 600 µA max.

The ADT14 is available in the 16-lead epoxy DIP and SO
(small outline) packages.

REV. 0

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: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1997

FUNCTIONAL BLOCK DIAGRAM

PIN CONFIGURATIONS

DIP & SO

OUTPUT 1

SETPOINT 1

NC
NC

VPTAT

SETPOINT 2

OUTPUT 2

1
2
3

ADT14

4

TOP VIEW

5

(Not to Scale)

6
7
8

NC = NO CONNECT

OUTPUT 4

16

SETPOINT 4

15

2.5V REFERENCE

14

V+

13

NCGROUND

12

HYSTERESIS

11

SETPOINT 3

10

OUTPUT 3

9

ADT14G–SPECIFICATIONS

(V+ = 5 V, –408C ≤ TA ≤ +1258C unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Units

ACCURACY

Accuracy (Setpoints 1, 2, 3 and 4) T
Accuracy (Setpoints 1, 2, 3 and 4) T

= +25°C ±2 ±3 °C

A

= –40°C to +125°C ±3 ±5 °C

A

VPTAT Output Scale Factor +4.9 +5 +5.1 mV/K
Setpoint Hysteresis Levels T
Power Supply Rejection Ratio PSRR 4.5 V ≤ V

= +25°C 0.65, 1.5, 5 °C

A

≤ 13 V 0.1 0.25 °C/V

S

Linearity 0.5 °C

SETPOINT INPUTS

Offset Voltage V

OS

Offset Voltage Mismatch T
Output Voltage Drift TCV
Input Bias Current I

B

OS

T

= +25°C1mV

A

= +25°C 0.5 mV

A

3 µV/°C
25 100 nA

REFERENCE OUTPUT

Line Regulation 4.5 V ≤ V
Load Regulation I
Output Voltage V
Output Voltage V
Output Drift TCV

REF
REF

REF

SOURCE

T

= +25°C, No Load 2.49 2.5 2.51 V

A

No Load, –40°C ≤ TA ≤ +125°C 2.48 2.5 2.52 V

≤ 13 V ±0.1 %/V

S

= 10 µA to 500 µA ±0.25 %/mA

±30 ppm/°C

OPEN-COLLECTOR OUTPUTS

Output Low Voltage V

Output Low Voltage V
Output Leakage Current I
Fall Time t

OL

OL
OH
HL

I

= 1.6 mA,

SINK

–40°C ≤ T
I

SINK

≤ +85°C 0.25 0.4 V

A

= 5 mA 0.6 V

V+ = 12 V 1 100 µA
See Figure 1 40 ns

POWER SUPPLY

Supply Range V+ 4.5 5.5 V
Supply Current I
Supply Current I

Specifications subject to change without notice.

SY
SY

Unloaded at +5 V 400 600 µA
Unloaded at +12 V 450 µA

ABSOLUTE MAXIMUM RATINGS*

Maximum Supply Voltage . . . . . . . . . . . . . . –0.3 V to +15 V

Maximum Setpoint Input Voltage . . –0.3 V to ([V+] +0.3 V)

Maximum Reference Output Current . . . . . . . . . . . . . .1 mA

Maximum Open-Collector Output Current . . . . . . . . . 15 mA

Maximum Open-Collector Output Voltage . . . . . . . . . +15 V

Operating Temperature Range . . . . . . . . . –55°C to +150°C

Dice Junction Temperature . . . . . . . . . . . . . . . . . . . . +175°C

Storage Temperature Range . . . . . . . . . . . –65°C to +160°C

Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . +300°C

*CAUTION

1. Stresses above those listed under Absolute Maximum
Ratings may cause permanent damage to the device. This is
a stress rating only; functional operation at or above this
specification is not implied. Exposure to the above maximum
rating conditions for extended periods may affect device
reliability.

2. Digital inputs are protected; however, permanent damage
may occur on unprotected units from high-energy electro­static fields. Keep units in conductive foam or packaging at all
times until ready to use. Use proper antistatic handling
procedures.

3. Remove power before inserting or removing units from their
sockets.

ORDERING GUIDE

Temperature Package Package

Model/Grade Range

1

Description Options

ADT14GP XIND Plastic DIP N-16
ADT14GS XIND SOIC R-16A

NOTES

1

XIND = 2408C to 11258C.

2

N = Plastic DIP; R = Small Outline.

THERMAL PACKAGE CHARACTERISTICS

Package Type u

JA

u

JC

Units

16-Lead Plastic DIP 103 34 8C/W
16-Lead SOIC 81 27 8C/W

V+

1kΩ

20pF

Figure 1. Test Load

2

–2–

REV. 0

ADT14

WAFER TEST LIMITS

(V+ = +5 V, GND = 0 V, TA = +258C unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Units

INPUTS SET HIGH, SET LOW

Input Bias Current I

B

70 nA

OUTPUT VPTAT

Temperature Accuracy T

OUTPUT V

Nominal Value V

REF

REF

= +25°C, No Load 1.5 °C

A

T

= +25°C, No Load 2.490 2.510 V

A

Line Regulation 4.5 V ≤ V ≤ 13.2 V ±0.08 %/V
Load Regulation 10 µA ≤ IV

≤ 500 µA ±0.25 %/mA

REF

OPEN-COLLECTOR OUTPUTS OVER, UNDER

Output Low Voltage V
Output Leakage Current I

OL

OH

I

= 1.6 mA 0.4 V

SINK

100 µA

POWER SUPPLY

Supply Range V+ 4.5 5.5 V
Supply Current I

NOTE
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly and nominal yield loss, yield after packaging is not guaranteed for
standard product dice. Consult factory to negotiate specifications based on lot qualification through sample lot assembly and testing.

SY

Unloaded 600 µA

DICE CHARACTERISTICS

Die Size 0.069 × 0.080 inch, 5520 sq. mils

(1.75 × 2.03 mm, 3.55 sq. mm)

Transistor Count: 130

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADT14 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

REV. 0

–3–

WARNING!

ESD SENSITIVE DEVICE

ADT14

–Typical Performance Characteristics

160

140

120

100

80

60

TIME CONSTANT – sec

40

20

0

0 700100 200 300 400 500 600

TRANSITION FROM +100°C STIRRED OIL BATH
TO FORCED +25°C AIR

V+ = +5V, NO LOAD

SOIC SOLDERED TO 0.6" 0.5" Cu PCB

PDIP IN SOLDERTAIL SOCKET
SOLDERED TO 0.8"

AIR VELOCITY – FPM

0.6" Cu PCB

Figure 2. Thermal Time Constant in Forced Air

100

90

80
70

60
50

40
30

CHANGE IN TEMPERATURE – %

20
10

0

0305 10152025

SOIC SOLDERED TO 0.6" 0.5" Cu PCB

PDIP IN SOLDERTAIL SOCKET
SOLDERED TO 0.8"

V+ = +5V, NO LOAD

0.6" Cu PCB

TIME – sec

40µs

V

VPTAT

IN

1.5V

5V

100

90

0V

10

0%

0V

Figure 5. Start-Up Response

5

4

3
2

1
0

1
2

ACCURACY ERROR – °C

3
4

5

50 15025 25 50 75 125

V+ = +5V, NO LOAD

TEMPERATURE – °C

500mV

MAX LIMIT

MIN LIMIT

1000

Figure 3. Thermal Response in Stirred Oil Bath

5.0

START-UP VOLTAGE DEFINED AS OUTPUT VALUE
BEING WITHIN

4.5

4.0

3.5

START-UP VOLTAGE – V

3.0
75 17525 25 75 125

5 C OF OUTPUT AT +5V

NO LOAD

TEMPERATURE – C

Figure 4. Start-Up Voltage vs. Temperature

Figure 6. Accuracy Error vs. Temperature, Stirred Oil Bath

600

500

400

300

200

SUPPLY CURRENT – A

100

0

0162 4 6 8 10 12 14

TA = +25°C, NO LOAD

SUPPLY VOLTAGE – V

Figure 7. Supply Current vs. Supply Voltage

–4–

REV. 0

ADT14

500

475

450

425

400

375

SUPPLY CURRENT – µA

350

325

300

75 17525 25 75 125

TEMPERATURE – °C

V+ = +5V, NO LOAD

Figure 8. Supply Current vs. Temperature

40

35

30

25

20

VOL = +1V, V+ = +5V

2.52

2.515

2.51

2.505

2.5

2.495

2.49

REFERENCE VOLTAGE – V

2.485

2.48
75 17525 25 75 125

TEMPERATURE – °C

MAX LIMIT

V+ = +5V, NO LOAD

MIN LIMIT

Figure 11. Reference Voltage vs. Temperature

0.1
V+ = +4.5V TO +13V

NO LOAD

0.075

0.05

15

10

5

OPEN-COLLECTOR SINK CURRENT – mA

0

75 17525 25 75 125

TEMPERATURE – °C

Figure 9. Open-Collector Output Sink Current vs.
Temperature

700

V+ = +5V, NO LOAD

600

500

400

300

200

100

OPEN-COLLECTOR OUTPUT VOLTAGE – mV

0

75 17525 25 75 125

I

= 5mA

LOAD

I

= 1mA

LOAD

TEMPERATURE – °C

0.025

POWER SUPPLY REJECTION – C/V

0

25

50

0 25 50 75 100 125

TEMPERATURE – °C

150

Figure 12. VPTAT Power Supply Rejection vs. Temperature

500µs

20mV

V

2.5V

LOAD

V

REF

100

90

0V

10

0%

Figure 10. Open-Collector Output Voltage vs. Temperature

REV. 0

–5–

Figure 13. V

= 5 k

R

LOAD

Under Load Switching (0 µA–500 µA),

REF

Ω