Analog Devices AD680 g Datasheet
Low Power, Low Cost
*
FEATURES
Low quiescent current: 250 µA max
Laser trimmed to high accuracy:
2.5 V ± 5 mV max (AN, AR grades)
Trimmed temperature coefficient:
20 ppm/°C Max (AN, AR grades)
Low noise: 8 µV p-p from 0.1 Hz to 10 Hz
Hz
250 nV/√
Temperature output pin (N, R packages)
Available in three package styles:
8-Lead PDIP, 8-lead SOIC, and 3-pin TO-92
GENERAL DESCRIPTION
The AD6801 is a band gap voltage reference that provides a
fixed 2.5 V output from inputs between 4.5 V and 36 V. The
architecture of the AD680 enables the reference to be operated
at a very low quiescent current while still realizing excellent dc
characteristics and noise performance. Trimming of the high
stability thin-film resistors is performed for initial accuracy and
temperature coefficient, resulting in low errors over temperature.
The precision dc characteristics of the AD680 make it ideal for
use as a reference for DACs that require an external precision
reference. The device is also ideal for ADCs and, in general, can
offer better performance than the standard on-chip references.
Based upon its low quiescent current, which rivals that of many
incomplete 2-terminal references, the AD680 is recommended
for low power applications, such as hand-held battery equipment.
A temperature output pin is provided on the 8-lead package
versions of the AD680. The temperature output pin provides an
output voltage that varies linearly with temperature and allows
the AD680 to be configured as a temperature transducer while
providing a stable 2.5 V output.
The AD680 is available in five grades. The AD680AN is specified for operation from −40°C to +85°C, while the AD680JN is
specified for 0°C to 70°C operation. Both the AD680AN and
AD680JN are available in an 8-lead PDIP packages. The
AD680AR is specified for operation from −40°C to +85°C,
while the AD680JR is specified for 0°C to 70°C operation.
Both are available in an 8-lead SOIC package. The AD680JT is
specified for 0°C to 70°C operation and is available in a 3-pin
TO-92 package.
wideband
2.5 V Reference
AD680
CONNECTION DIAGRAMS
TP*
1
+V
2
IN
AD680
3
TEMP
GND
TP DENOTES FACTORY TEST POINT.
NO CONNECTIONS SHOULD BE MADE
TO THESE PINS.
Figure 1. 8-Lead PDIP and SOIC Pin Configuration
TOP VIEW
(Not to Scale)
4
NC = NO CONNECT
AD680
BOTTOM VIEW
(Not to Scale)
32
+VINV
OUT
Figure 2. Connection Diagram
PRODUCT HIGHLIGHTS
1. The AD680 band gap reference operates on a very low quiescent current which rivals that of many 2-terminal references.
This makes the complete, higher accuracy AD680 ideal for
use in power sensitive applications.
2. Laser trimming of both initial accuracy and temperature coefficients results in low errors over temperature without the use
of external components. The AD680AN and AD680AR have
a maximum variation of 6.25 mV between −40°C and +85°C.
3. The AD680 noise is low, typically 8 µV p-p from 0.1 Hz to
10 Hz. Spectral density is also low, typically 250 nV/√
4. The temperature output pin on the 8-lead package versions
enables the AD680 to be configured as a temperature
transducer.
5. PDIP packaging provides machine insertability, while SOIC
packaging provides surface-mount capability. TO-92 packaging offers a cost-effective alternative to 2-terminal references,
offering a complete solution in the same package in which
2-terminal references are usually found.
1
Protected by U.S. Patent Nos. 4,902,959; 4,250,445; and 4,857,862.
1
GND
TP*
8
7
TP*
6
V
OUT
5
NC
00813-003
00813-004
Hz
.
Rev. G
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
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
www.analog.com
AD680
TABLE OF CONTENTS
Specifications..................................................................................... 3
Load Regulation ............................................................................8
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Connection Diagram............................... 5
Theory of Operation ........................................................................ 6
Applying the AD680 .................................................................... 6
Noise Performance .......................................................................6
Turn -on Time ................................................................................ 7
Dynamic Performance................................................................. 7
REVISION HISTORY
12/04— Rev. F to Rev. G
Updated Format .................................................................Universal
Changes to Ordering Guide ..........................................................11
5/04—Rev. E to Rev. F
Changes to ORDERING GUIDE ....................................................3
Temperature Performance............................................................8
Temperature Output Pin ..............................................................9
Differential Temperature Transducer.........................................9
Low Power, Low Voltage Reference for Data Converters ........9
4.5 V Reference from a 5 V Supply.......................................... 10
Voltage Regulator for Portable Equipment ............................. 10
Outline Dimensions .......................................................................11
Ordering Guide .......................................................................... 12
5/03—Rev. D to Rev. E
Changes to ORDERING GUIDE ....................................................3
Added ESD Caution...........................................................................3
Changes to Figure 20..........................................................................7
Updated OUTLINE DIMENSIONS ................................................8
7/01—Rev. C to Rev. D
Changes to SPECIFICATIONS.........................................................2
Changes to ORDERING GUIDE .....................................................3
Table I added .......................................................................................6
Rev. G | Page 2 of 12
AD680
SPECIFICATIONS
TA = 25°C, VIN = 5 V, unless otherwise noted.
Table 1.
AD680AN/AD680AR AD680JN/AD680JR AD680JT
Parameter Typ Max Min Typ Max Min Typ Max Unit
OUTPUT VOLTAGE
Output Voltage, V
Initial Accuracy, V
O
OERR
−0.20 +0.20 −0.40 +0.40 −0.40 +0.40 %
OUTPUT VOLTAGE DRIFT
1
0°C to 70°C 10 10 25 10 30 ppm/°C
−40°C to +85°C 20 25 25 ppm/°C
LINE REGULATION
4.5 V ≤ +VIN ≤ 15 V 40 40 40 µV/V
(@ T
to T
MIN
) 40 40 40 µV/V
MAX
15 V ≤ +VIN ≤ 36 V 40 40 40 µV/V
(@ T
to T
MIN
) 40 40 40 µV/V
MAX
LOAD REGULATION
0 < I
< 10 mA 80 100 80 100 80 100 µV/mA
OUT
(@ T
to T
MIN
) 80 100 80 100 80 100 µV/mA
MAX
QUIESCENT CURRENT 195
(@ T
to T
MIN
) 280 280 280 µA
MAX
POWER DISSIPATION 1
OUTPUT NOISE
0.1 Hz to 10 Hz 8 10 8 10 8 10 µV p-p
Spectral Density, 100 Hz 250 250 250
CAPACITIVE LOAD 50 50 50 nF
LONG-TERM STABILITY 25 25 25 ppm/1000 hr
SHORT-CIRCUIT CURRENT TO GROUND 25 50 25 50 25 50 mA
TEMPERATURE PIN
Voltage Output @ 25°C 540 596 660 540 596 660 mV
Temperature Sensitivity 2 2 mV/°C
Output Current −5 +5 −5 +5 µA
Output Resistance 12 12 kΩ
TEMPERATURE RANGE
Specified Performance −40 +85 0 70 0 70 °C
Operating Performance
2
1
Maximum output voltage drift is guaranteed for all packages.
2
The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance
outside their specified temperature range.
Specifications in boldface are tested on all production units at final electrical test. Results from these tests are used to calculate outgoing quality levels. All minimum
and maximum specifications are guaranteed.
2.495 2.500 2.505 2.490 2.500 2.510 2.490 2.500 2.510 V
−5 +5 −10 +10 −10 +10 mV
250
1.25
195
1
250
1.25
195
1
250
1.25
µA
mW
nV/√
Hz
−40 +85 −40 +85 −40 +85 °C
Rev. G | Page 3 of 12
AD680
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VIN to Ground 36 V
Power Dissipation (25°C) 500 mW
Storage Temperature −65°C to +125°C
Lead Temperature (Soldering, 10 s) 300°C
Package Thermal Resistance θJA (All Packages) 120°C/W
Output Protection: Output safe for indefinite
short to ground and momentary short to V
.
IN
ESD 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 this product 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.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. G | Page 4 of 12
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