Analog Devices AD1385TD-883B, AD1385TD, AD1385KD Datasheet

16-Bit 500 kHz

a

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 Autocalibration

APPLICATIONS
Medical Imaging

CAT

Magnetic Resonance
Radar
Vibration Analysis
Parametric Measurement Unit (ATE)
Digital Storage Oscilloscopes
Waveform Recorders
Analytical Instruments

Wide Temperature Range Sampling ADC

AD1385

FUNCTIONAL BLOCK DIAGRAM

PRODUCT DESCRIPTION

The 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.

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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.

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

AD1385–SPECIFICA TIONS

(TA = +258C, VS = 615 V, VDD = +5 V, VSS = –5 V, 10 MHz External Clock,
unless otherwise noted)

Parameter Min Typ Max Min Typ Max Units

AD1385KD AD1385TD

RESOLUTION 16 16 Bits
ANALOG INPUT

Input Ranges ±5, ±10 ±5, ±10 V
Input Impedance 2.45 2.5 2.55 2.45 2.5 2.55 kΩ

TRANSFER CHARACTERISTICS

(Combined ADC/Track/Hold)
Integral Nonlinearity
Differential Nonlinearity

Drift, T

Drift, T

MIN

4

MIN

Missing Codes, T
Gain Error

Bipolar Zero

Drift, T

MIN

to T

to T

4

to T

MAX

MIN

MAX

MAX

1, 2

, T

to T

1

MIN

MAX

to T

MAX

±0.0015 ±0.0015 % FSR
±0.0006 ±0.0015 ±0.0006 ±0.0015 % FSR

0.3 0.3 ppm/°C
None None

±0.05 ±0.15 ±0.05 ±0.15 % FSR
8 15 8 15 ppm/°C
±0.05 ±0.10 ±0.05 ±0.10 % FSR

5 15 5 15 ppm/°C
PSRR ±0.006 ±0.10 ±0.006 ±0.10 % FSR/V
Noise 70 70 µV rms

MIN

2

to T

MAX

DYNAMIC CHARACTERISTICS

±5 V FSR, VIN = –0.4 dB, T

Sample Rate 500 500 kHz
Signal-to-Noise Ratio

5

f = 5 kHz 90 93 90 93 dB
f = 100 kHz 90 92 90 92 dB
f = 200 kHz 88 91 88 91 dB

Peak Distortion

f = 5 kHz –90 –107 –90 –107 dB
f = 100 kHz –88 –95 –88 –95 dB
f = 200 kHz –82 –88 –82 –88 dB

Total Harmonic Distortion

6

f = 5 kHz –90 –105 –90 –105 dB
f = 100 kHz –88 –95 –88 –95 dB
f = 200 kHz –82 –88 –82 –88 dB

MIN

2

to T

MAX

DYNAMIC CHARACTERISTICS

±10 V FSR, VIN = –0.4 dB, T

Sample Rate 500 500 kHz
Signal-to-Noise Ratio

5

f = 5 kHz 90 95 90 95 dB
f = 100 kHz 90 94 90 94 dB
f = 200 kHz 88 93 88 93 dB

Peak Distortion

f = 5 kHz –90 –108 –90 –108 dB
f = 100 kHz –80 –87 –80 –87 dB
f = 200 kHz –74 –82 –74 –82 dB

Total Harmonic Distortion

6

f = 5 kHz –90 –105 –90 –105 dB
f = 100 kHz –80 –87 –80 –87 dB
f = 200 kHz –74 –82 –74 –82 dB

DIGITAL INPUTS

Input Voltage

V

IL

V

IH

2.25 2.25 V

0.8 0.8 V

Input Current ±200 ±200 µA
Input Capacitance 2 2 pF
Clock

Frequency 2.5–10 2.5–10 MHz
Duty Cycle 40-60 40-60 %

Aperture Delay

7

77ns

DIGITAL OUTPUTS

Output Voltage

@ IOL = 3.2 mA 0.2 0.4 0.2 0.4 V

V

OL

@ IOH = –3.2 mA 2.4 4.5 2.4 4.5 V

V

OH

Output Capacitance 4 4 pF
Leakage, Outputs Disabled ±200 ±200 µA

3

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AD1385

Parameter Min Typ Max Min Typ Max Units

AD1385KD AD1385TD

OUTPUT CODING Complementary Offset Binary or Complementary Twos Complement
INTERNAL REFERENCE

Voltage 9.990 10.010 9.990 10.010 V
Current 2 5 2 5 mA
Drift 5 15 5 15 ppm/°C

TEMPERATURE RANGE, CASE

Specified 0 +70 –55 +125 °C
Storage –65 +150 –65 +150 °C

POWER REQUIREMENTS

Specified Operating Range

±V
+V
–V

S
DD

SS

14.25 15.75 14.25 15.75 V

4.75 5.25 4.75 5.25 V
–5.25 –4.75 –5.25 –4.75 V

Current Drains

+V
–V
+V
–V

S

S

DD

SS

52 80 52 80 mA
48 75 48 75 mA
104 160 104 160 mA
148 200 148 200 mA

Power Dissipation 2.76 4.125 2.76 4.125 Watts

NOTES

1

Integral linearity is inferred from FFTs. Differential linearity is derived from histograms.

2

Performance over temperature is specified at the temperature at which the last calibration was performed.

3

FSR = Full-Scale Range.

4

Adjustable to zero.

5

SNR excludes harmonics 2-9 of the fundamental.

6

THD includes harmonics 2-9 of the fundamental.

7

Aperture delay is the time from the rising edge on the Hold Command Input to the opening of the switch in the Track/Hold.

Specifications subject to change without notice.

1, 2

TIMING SPECIFICATIONS

(TA = –558C to +1258C, VS = 615 V, VDD = +5 V, VSS = –5 V)

Parameter Design Minimum Typ Unit Description

START COMMAND

t

SCS

t

SCH

10 ns Setup Time
10 ns Hold Time

AUTOZERO

t

AZS

t

AZH

DATA VALID

t

DVS

t

DVH

HOLD COMMAND

t

H

t

D

DATA STROBE

t

DS

t

DSD

10 ns Setup Time
20 ns Hold Time

1.5 CP

0.5 CP

13 CP

3
3

3

Setup Time
Hold Time

Hold Time

7 ns Delay Time

2CP

16.5 CP

3
3

Pulse Width

Delay
CALIBRATE PULSE WIDTH 20 ns
CALIBRATION STATUS 15 ms Duration

NOTES

1

Refer to Figures 17, 18 and 24.

2

Design minimums are derived from worst case design analysis and/or simulation results. Typical values are based on characterization data. These specifications are
not guaranteed or tested.

3

The time duration for this parameter varies in direct proportion to the width of the Clock Pulse (CP).

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AD1385

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

+VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V

–V

to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V

S

V

to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

DD

V

to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –7 V

SS

AGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V

Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±V

S

Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . .0 V to +11 V

Digital Inputs . . . . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

DD

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.

ORDERING GUIDE

Temperature

Model Range (Case) Package Option*

AD1385KD 0°C to +70°C DH-48A
AD1385TD –55°C to +125°C DH-48A
AD1385TD/883B –55°C to +125°C DH-48A

*DH-48A = Bottom Brazed Ceramic DIP.

AD1385 PIN CONNECTIONS

The AD1385 is housed in a 48-pin bottom-brazed ceramic
bathtub package. The pinout is as follows:

Pin Function Pin Function

11 CLOCK IN 48 V

(+5 V POWER)

DD2

12 POWER GROUND 47 POWER GROUND
13 B1/B9 (MSB) 46 V

(–5 V POWER)

SS2

14 B2/B10 45 AUTOZERO
15 B3/B11 44 B1 SELECT
16 B4/B12 43 POWER GROUND
17 B5/B13 42 POWER GROUND
18 B6/B14 41

CAL

19 B7/B15 40 GAIN ADJUST

10 B8/B16 (LSB) 39 +10 V REFERENCE OUT
11 V

(+5 V SIGNAL) 38 –VS1 (–15 V)

DD1

12 POWER GROUND 37 SIGNAL GROUND
13 V

(–5 V SIGNAL) 36 +VS1 (+15 V)

SS1

14 SIGNAL GROUND 35 SIGNAL GROUND
15 DATA STROBE 34 DNC
16 HI/LO BYTE SELECT 33 DNC
17

OE DATA ENABLE 32 +10 V REFERENCE IN

18 START CONVERT 31 V

B

IN

19 HOLD COMMAND OUT 30 VIN A
20 SIGNAL GROUND 29 OFFSET ADJUST
21 +V

(+15 V) 28 CAL STATUS

S2

22 HOLD COMMAND IN 27 TRACK/HOLD OU TPUT
23 –VS2 (–15 V) 26 SIGNAL GROUND
24 POWER GROUND 25 TRACK/HOLD INPUT

DNC = DO NOT CONNECT.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD1385 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

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AD1385

Figure 1. Spurious-Free Range vs. Input Amplitude,

±

5 V Range, 2048-Point FFT, 500 kHz Sample Rate

Figure 2. Spurious-Free Range vs. Input Amplitude,

±

10 V Range, 2048-Point FFT, 500 kHz Sample Rate

Figure 4. Full-Scale Sine Wave Power Spectral Density,

±

5 V Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 5. Full-Scale Sine Wave Power Spectral Density,

±

5 V Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 3. Full-Scale Sine Wave Power Spectral Density,

±

5 V Range, 16384-Point FFT, 500 kHz Sample Rate

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Figure 6. 100 kHz Intermodulation Performance, ±5 V
Range, 16384-Point FFT, 500 kHz Sample Rate

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AD1385

Figure 7. 200 kHz Intermodulation Performance, ±5 V
Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 8. Full-Scale Sine Wave Power Spectral Density,

±

10 V Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 10. Full-Scale Sine Wave Power Spectral Density,

±

10 V Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 11. 100 kHz Intermodulation Performance, ±10 V
Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 9. Full-Scale Sine Wave Power Spectral Density,

±

10 V Range, 16384-Point FFT, 500 kHz Sample Rate

Figure 12. 200 kHz Intermodulation Performance, ±10 V
Range, 16384-Point FFT, 500 kHz Sample Rate

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