Datasheet AD680 (Analog Devices)

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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* 1 8 TP* 2.5 V ± 5 mV max (AN, AR grades) +VIN 2 AD680 7 TP* Trimmed temperature coefficient TEMP 3 TOP VIEW 6 VOUT (Not to Scale) 20 ppm/°C max (AN, AR grades) GND 4 5 NC Low noise at 8 μV p-p from 0.1 Hz to 10 Hz NC = NO CONNECT 250 nV/√Hz wideband * TP DENOTES FACTORY TEST POINT. NO CONNECTIONS SHOULD BE MADE Temperature output pin (N, R packages) TO THESE PINS.
00813-003
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 GENERAL DESCRIPTION AD680 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
3 2 1 +VIN VOUT GND
architecture of the AD680 enables the reference to be operated 00813-004 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 incomplete 2-terminal references, the AD680 is recommended 2. Low Errors. for low power applications, such as hand-held, battery-operated Laser trimming of both initial accuracy and temperature coef- equipment. ficients results in low errors over temperature without the use 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 mV between −40°C and +85°C. versions of the AD680. The temperature output pin provides an output voltage that varies linearly with temperature and allows 3. Low Noise. the AD680 to be configured as a temperature transducer while The AD680 noise is low, typically 8 μV p-p from 0.1 Hz to providing a stable 2.5 V output. 10 Hz. Spectral density is also low, typically 250 nV/√Hz. The AD680 is available in five grades. The AD680AN is speci- 4. Temperature Transducer. fied for operation from −40°C to +85°C, while the AD680JN is The temperature output pin on the 8-lead package versions specified for 0°C to 70°C operation. Both the AD680AN and enables the AD680 to be configured as a temperature AD680JN are available in 8-lead PDIP packages. The AD680AR transducer. 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.
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Document Outline FEATURES GENERAL DESCRIPTION CONNECTION DIAGRAMS PRODUCT HIGHLIGHTS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS OUTPUT PROTECTION ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS THEORY OF OPERATION APPLYING THE AD680 NOISE PERFORMANCE TURN-ON TIME DYNAMIC PERFORMANCE LOAD REGULATION TEMPERATURE PERFORMANCE TEMPERATURE OUTPUT PIN DIFFERENTIAL TEMPERATURE TRANSDUCER LOW POWER, LOW VOLTAGE REFERENCE FOR DATA CONVERTERS 4.5 V REFERENCE FROM A 5 V SUPPLY VOLTAGE REGULATOR FOR PORTABLE EQUIPMENT OUTLINE DIMENSIONS ORDERING GUIDE