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Analog Devices Semiconductor Electronic Components Datasheet



AD1385

16-Bit 500 kHz Wide Temperature Range Sampling ADC



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AD1385 pdf
a
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.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703



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AD1385 pdf
AD1385–SPECIFICATIONS (TA = +25؇C, VS = ؎15 V, VDD = +5 V, VSS = –5 V, 10 MHz External Clock,
unless otherwise noted)
Parameter
RESOLUTION
ANALOG INPUT
Input Ranges
Input Impedance
TRANSFER CHARACTERISTICS
(Combined ADC/Track/Hold)
Integral Nonlinearity1, 2, TMIN to TMAX
Differential Nonlinearity1
Drift, TMIN to TMAX
Missing Codes, TMIN to TMAX
Gain Error4
Drift, TMIN to TMAX
Bipolar Zero4
Drift, TMIN to TMAX
PSRR
Noise
DYNAMIC CHARACTERISTICS2
± 5 V FSR, VIN = –0.4 dB, TMIN to TMAX
Sample Rate
Signal-to-Noise Ratio5
f = 5 kHz
f = 100 kHz
f = 200 kHz
Peak Distortion
f = 5 kHz
f = 100 kHz
f = 200 kHz
Total Harmonic Distortion6
f = 5 kHz
f = 100 kHz
f = 200 kHz
DYNAMIC CHARACTERISTICS2
± 10 V FSR, VIN = –0.4 dB, TMIN to TMAX
Sample Rate
Signal-to-Noise Ratio5
f = 5 kHz
f = 100 kHz
f = 200 kHz
Peak Distortion
f = 5 kHz
f = 100 kHz
f = 200 kHz
Total Harmonic Distortion6
f = 5 kHz
f = 100 kHz
f = 200 kHz
DIGITAL INPUTS
Input Voltage
VIL
VIH
Input Current
Input Capacitance
Clock
Frequency
Duty Cycle
Aperture Delay7
DIGITAL OUTPUTS
Output Voltage
VOL @ IOL = 3.2 mA
VOH @ IOH = –3.2 mA
Output Capacitance
Leakage, Outputs Disabled
AD1385KD
Min Typ
Max
16
± 5, ± 10
2.45 2.5
2.55
AD1385TD
Min Typ
16
Max
± 5, ± 10
2.45 2.5
2.55
Units
Bits
V
k
± 0.0015
± 0.0006
0.3
± 0.05
8
± 0.05
5
± 0.006
70
± 0.0015
None
± 0.15
15
± 0.10
15
± 0.10
± 0.0015
± 0.0006
0.3
± 0.05
8
± 0.05
5
± 0.006
70
± 0.0015
None
± 0.15
15
± 0.10
15
± 0.10
% FSR3
% FSR
ppm/°C
% FSR
ppm/°C
% FSR
ppm/°C
% FSR/V
µV rms
500
90 93
90 92
88 91
–90 –107
–88 –95
–82 –88
–90 –105
–88 –95
–82 –88
500
90 93
90 92
88 91
–90 –107
–88 –95
–82 –88
–90 –105
–88 –95
–82 –88
kHz
dB
dB
dB
dB
dB
dB
dB
dB
dB
500
90 95
90 94
88 93
–90 –108
–80 –87
–74 –82
–90 –105
–80 –87
–74 –82
500
90 95
90 94
88 93
–90 –108
–80 –87
–74 –82
–90 –105
–80 –87
–74 –82
kHz
dB
dB
dB
dB
dB
dB
dB
dB
dB
2.25
2
2.5–10
40-60
7
0.8
± 200
2.25
2
2.5–10
40-60
7
0.8
± 200
V
V
µA
pF
MHz
%
ns
0.2
2.4 4.5
4
0.4
0.2 0.4
V
2.4 4.5
V
4 pF
± 200
± 200
µA
–2– REV. 0



Part Number AD1385
Description 16-Bit 500 kHz Wide Temperature Range Sampling ADC
Maker Analog Devices - Analog Devices
Total Page 20 Pages
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