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
Parametric Measurement Unit (ATE)
Digital Storage Oscilloscopes
16-Bit 500 kHz
Wide Temperature Range Sampling ADC
FUNCTIONAL BLOCK DIAGRAM
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
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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use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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