Features: `16-Bit Resolution
`500 kHz Sampling Rate
`Differential Linearity Autocalibration
`Specified over 558C to +1258C 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
`65, 610 V Bipolar Input Ranges
`Zero Offset AutocalibrationApplication·Medical Imaging
CAT
Magnetic Resonance
·Radar
·Vibration Analysis
·Parametric Measurement Unit (ATE)
·Digital Storage Oscilloscopes
·Waveform Recorders
·Analytical InstrumentsSpecifications+VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 V
VDD to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V
VSS to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
AGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±VS
Reference Input . . . . . . . . . . . . . . . . . . . . . . .0 V to +11 V
Digital Inputs . . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Output Short Circuit Duration
Reference Output . . . . . . . . . . . . . . . . . . . . . ..Indefinite
Track/Hold Output . . . . . . . . . . . . . . . . . . . . . . . . . 1 sec
Digital Outputs . . . . . . . . . . . .1 sec for Any One Output
Case Temperature (Operating) . . . . . .55°C to +125°C
Storage Temperature . . . . . . . . . . . . . 65°C to +150°C
*Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe AD1385 is a complete 500 kHz, 16-bit, sampling analogto-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 performance,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 proprietary 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 system performance and operating temperature range.
AD1385 Data Sheet
