ADADC85SZ12 Analog Devices, ADADC85SZ12 Datasheet

ADADC85SZ12

Manufacturer Part Number

ADADC85SZ12

Description

DIP32

Manufacturer

Analog Devices

Datasheet

1.ADADC85SZ-12883B.pdf (12 pages)

Specifications of ADADC85SZ12

Date_code

07+

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FEATURES

PERFORMANCE

Complete 12-bit A/D converter with reference and clock

Fast successive approximation conversion: 10 µs or 5 µs

Buried Zener reference for long-term stability and low

Max nonlinearity: < ±0.012%

Low power: 880 mW typ

Low chip count—high reliability

Industry-standard pinout

Z models for ±12 V operation available

MIL-STD-883B processing available

VERSATILITY

Negative true parallel logic outputs

Short cycle capability

Precision +6.3 V reference for external applications

PRODUCT DESCRIPTION

The AD ADC84/AD ADC85 series devices are high speed, low cost

12-bit successive approximation analog-to-digital converters that

include an internal clock, reference, and comparator. Its hybrid IC

design utilizes MSI digital and linear monolithic chips in

conjunction with a 12-bit monolithic DAC to provide modular

performance and versatility with IC size, price, and reliability.

Important performance characteristics of the AD ADC84/

AD ADC85 series include maximum linearity error of ±0.012%;

gain TC below 15 ppm/°C at 25°C; typical power dissipation of

880 mW; and conversion time of less than 10 µs for the 12-bit

versions. Of considerable significance in severe and aerospace

applications is the guaranteed performance from –55°C to +125°C

of the AD ADC85S, which is also available with environmental

screening. Monotonic operation of the feedback DAC guarantees

no missing codes over temperature ranges of 0°C to +70°C, –25°C

to +85°C, and –55°C to +125°C.

The design of the AD ADC84/AD ADC85 includes scaling resistors

that provide analog input signal ranges of ±2.5 V, ±5 V, ±10 V, 0 V to

+5 V, or 0 V to +10 V. The 6.3 V precision reference, which can be

used for external applications, and the input buffer amplifier add

flexibility and value. All digital signals are fully DTL and TTL

compatible, and the data output is negative-true and available in

parallel form.

The AD ADC84/AD ADC85 are available in a performance grade

specified for 12-bit accuracy (±0.012% FSR max) with 10 µs

maximum conversion time.

Rev. B

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.

Gain TC: 10 ppm/°C

The AD ADC84 and AD ADC85C are specified for operation over

the 0°C to +70°C temperature range. The AD ADC85 and

AD ADC85S are specified for the –25°C to +85°C and –55°C to

+125°C ranges, respectively. The serial output function is no longer

supported on the AD ADC84/AD ADC85 after date code 9623.

PRODUCT HIGHLIGHTS

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

The AD ADC84/ AD ADC85 series devices are complete

12-bit ADCs. No external components are required to perform

a conversion.

The AD ADC84/ AD ADC85 directly replaces other devices of

this type with significant increases in performance.

The fast conversion rates of the AD ADC84 and AD ADC85

(10 μs) make them an excellent choice for applications

requiring high system throughput rates.

The internal buried Zener reference is laser trimmed to 6.3 V

±0.1% and ±10 ppm/°C typical TC. The reference is available

externally and can provide up to 1 mA.

The integrated package construction provides high quality and

reliability with small size and weight.

The monolithic 12-bit feedback DAC is used for reduced chip

count and higher reliability.

The AD ADC85S/883B comes processed to MIL-STD-883,

Class B requirements.

Figure 1. Functional Block Diagram

12-Bit A/D Converters

AD ADC84/AD ADC85

Fast, Complete

www.analog.com

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