Low Power, Low Cost
2.5 V Reference
AD680
FEATURES
Low quiescent current at 250 μA max
CONNECTION DIAGRAMS
TP*
1
2
3
4
8
7
6
5
TP*
TP*
V
Laser trimmed to high accuracy
2.5 V 5 mV max (AN, AR grades)
Trimmed temperature coefficient
20 ppm/°C max (AN, AR grades)
+V
IN
AD680
TEMP
TOP VIEW
OUT
(Not to Scale)
GND
NC
Low noise at 8 μV p-p from 0.1 Hz to 10 Hz
250 nV/√Hz wideband
Temperature output pin (N, R packages)
NC = NO CONNECT
*TP DENOTES FACTORY TEST POINT.
NO CONNECTIONS SHOULD BE MADE
TO THESE PINS.
Available in three package styles
Figure 1. 8-Lead PDIP and 8-Lead SOIC Pin Configuration
8-lead PDIP, 8-lead SOIC, and 3-pin TO-92
AD680
BOTTOM VIEW
(Not to Scale)
GENERAL DESCRIPTION
The AD680 is a band gap voltage reference that provides a fixed
2.5 V output from inputs between 4.5 V and 36 V. The
3
2
1
+V
V
GND
IN
OUT
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.
Figure 2. Connection Diagram TO-92
PRODUCT HIGHLIGHTS
1. High Accuracy.
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.
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-operated
equipment.
2. Low Errors.
Laser trimming of both initial accuracy and temperature coef-
ficients 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.
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.
3. Low Noise.
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/√Hz.
4. Temperature Transducer.
The AD680 is available in five grades. The AD680AN is speci-
fied 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 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 8-lead SOIC packages. The AD680JT is specified for
0°C to 70°C operation and is available in a 3-pin TO-92
package.
The temperature output pin on the 8-lead package versions
enables the AD680 to be configured as a temperature
transducer.
5. Low Cost.
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.
Rev. H
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: 781.461.3113
www.analog.com
©2005 Analog Devices, Inc. All rights reserved.
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