FUNCTIONAL BLOCK DIAGRAM

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a

16-Bit 500 kHz

Wide Temperature Range Sampling ADC

AD1385

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

Tel: 617/329-4700

Fax: 617/326-8703

FEATURES

16-Bit Resolution

500 kHz Sampling Rate

Differential Linearity Autocalibration

Specified over –55 C to +125 C Range

SNR 90 dB @ 100 kHz (min)

THD –88 dB @ 100 kHz (min)

0.0006% FSR DNL (typ)

0.0015% FSR INL (typ)

No Missing Codes

5,

10 V Bipolar Input Ranges

Zero Offset Autocalibration

APPLICATIONS

Medical Imaging

CAT

Magnetic Resonance

Radar

Vibration Analysis

Parametric Measurement Unit (ATE)

Digital Storage Oscilloscopes

Waveform Recorders

Analytical Instruments

PRODUCT DESCRIPTION

The AD1385 is a complete 500 kHz, 16-bit, sampling analog-

to-digital converter contained in a single package. Its differential

linearity autocalibration feature allows this high resolution, high

speed converter to offer outstanding noise and distortion perfor-

mance, as well as excellent INL and DNL specifications, over

the full military temperature range. Autocalibration effectively

eliminates DNL drift over temperature.

The AD1385 architecture includes a low noise, low distortion

track/hold, a three pass digitally corrected subranging ADC, and

linearity calibration circuitry. A complete linearity calibration

requires only 15 ms. Precision thin-film resistors and a propri-

etary DAC contribute to the part’s outstanding dynamic and

static performance.

The AD1385 uses four power supplies,

±5 V and ±15 V, and an

external 10 MHz clock. Power dissipation is nominally 2.76 W.

Two user selectable bipolar input ranges,

±5 V and ±10 V, are

provided. Careful attention to grounding and a single package

make it easy to design PCBs to achieve specified performance.

The AD1385’s pinout is nearly identical to that of the AD1382,

a factory calibrated 16-bit, 500 kHz SADC. Just two additional

connections, to enable and monitor autocalibration, are required.

This commonality provides an easy upgrade path to extend sys-

tem performance and operating temperature range.