AN ANALOG DEVICES AD680 BANDGAP, LOW POWER 2.5V REFERENCE DATA SHEET (REV H, AUG 01, 2005) User Manual and Technical Specifications

Low Power, Low Cost 2.5 V Reference

AD680 FEATURES

CONNECTION DIAGRAMS

Low quiescent current at 250 μA max

Laser trimmed to high accuracy TP* TP* 2.5 V ± 5 m V max (AN, AR grades) +VIN TP*

AD680

Trimmed temperature coefficient TEMP TOP VIEW VOUT

(Not to Scale)

20 ppm/°C max (AN, AR grades) GND NC

Low noise at 8 μV p-p from 0.1 Hz to 10 Hz NC = NO CONNECT

*TP DENOTES FACTORY TEST POINT.

250 n V/√Hz wideband

NO CONNECTIONS SHOULD BE MADE TO THESE PINS.

Temperature output pin (N, R packages) 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

GENERAL DESCRIPTION

BOTTOM VIEW (Not to Scale)

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

+VIN VOUT GND

architecture of the AD680 enables the reference to be operated at a very low quiescent current while still realizing excellent dc

Figure 2. Connection Diagram TO-92

characteristics and noise performance. Trimming of the high stability thin-film resistors is performed for initial accuracy and

PRODUCT HIGHLIGHTS

temperature coefficient, resulting in low errors over temperature.

1. High Accuracy. The precision dc characteristics of the AD680 make it ideal for The AD680 band gap reference operates on a very low use as a reference for DACs that require an external precision quiescent current which rivals that of many 2-terminal reference. The device is also ideal for ADCs and, in general, can references. This makes the complete, higher accuracy AD680 offer better performance than the standard on-chip references. ideal for use in power-sensitive applications.

Based upon its low quiescent current, which rivals that of many

2. Low Errors.

incomplete 2-terminal references, the AD680 is recommended

Laser trimming of both initial accuracy and temperature coef-

for low power applications, such as hand-held, battery-operated

ficients results in low errors over temperature without the use

equipment.

of external components. The AD680AN and AD680AR have

A temperature output pin is provided on the 8-lead package a maximum variation of 6.25 m V between −40°C and +85°C.

versions of the AD680. The temperature output pin provides an

3. Low Noise.

output voltage that varies linearly with temperature and allows

The AD680 noise is low, typically 8 μV p-p from 0.1 Hz to

the AD680 to be configured as a temperature transducer while

10 Hz. Spectral density is also low, typically 250 n V/√Hz.

providing a stable 2.5 V output.

4. Temperature Transducer.

The AD680 is available in five grades. The AD680AN is speci-

The temperature output pin on the 8-lead package versions

fied for operation from −40°C to +85°C, while the AD680JN is

enables the AD680 to be configured as a temperature

specified for 0°C to 70°C operation. Both the AD680AN and

transducer.

AD680JN are available in 8-lead PDIP packages. The AD680AR is specified for operation from −40°C to +85°C, while the

5. Low Cost.

AD680JR is specified for 0°C to 70°C operation. Both are

PDIP packaging provides machine insertability, while SOIC

available in 8-lead SOIC packages. The AD680JT is specified for

packaging provides surface-mount capability. TO-92

0°C to 70°C operation and is available in a 3-pin TO-92

packaging offers a cost-effective alternative to 2-terminal

package.

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.

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