AD1385 Datasheet, PDF (1/20 Pages) Analog Devices – 16-Bit 500 kHz Wide Temperature Range Sampling ADC

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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
16-Bit 500 kHz
Wide Temperature Range Sampling ADC
AD1385
FUNCTIONAL BLOCK DIAGRAM
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.
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