ANALOG DEVICES AD1380 Service Manual
Low Cost
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FEATURES
Complete sampling 16-bit ADC with reference and clock
50 kHz throughput
±1/2 LSB nonlinearity
Low noise SHA: 300 μV p-p
32-lead hermetic DIP
Parallel output
Low power: 900 μW
APPLICATIONS
Medical and analytical instrumentation
Signal processing
Data acquisition systems
Professional audio
Automatic test equipment (ATE)
Telecommunications
GENERAL DESCRIPTION
The AD1380 is a complete, low cost 16-bit analog-to-digital
co
nverter, including internal reference, clock and sample/hold
amplifier. Internal thin-film-on-silicon scaling resistors allow
analog input ranges of ±2.5 V, ±5 V, ±10 V, 0 V to +5 V and
0 V to +10 V.
Important performance characteristics of the AD1380 include
um linearity error of ±0.003% of FSR (AD1380KD) and
maxim
maximum 16-bit conversion time of 14 μs. Transfer
characteristics of the AD1380 (gain, offset and linearity) are
specified for the combined ADC/sample-and-hold amplifier
(SHA), so total performance is guaranteed as a system. The
AD1380 provides data in parallel with corresponding clock and
status outputs. All digital inputs and outputs are TTL or 5 V
CMOS-compatible.
S/H IN
DIGITAL
COMMON
ANALOG
COMMON
16-Bit Sampling ADC
FUNCTIONAL BLOCK DIAGRAM
S/H
+10V
SPAN
6
+20V
SPAN
AD1380
26
CLOCK
OUT
BIPOLAR
7
Figure 1.
+5V
+15V
–15V
OUT
SAMPLE
AND
31
HOLD
29
30
2
TIMING CIRCUITRY
8
1
28
START
CONVERT
32
COMPARATOR
4
NC = NO CONNECT
AD1380
GAIN
IN
ADJ
5
ADCREF
3
24
23
10
9
25
27
MSB
BIT 2
BIT 15
LSB
NC
BUSY
00764-001
The serial output function is no longer available after date
de 0120.
co
Rev. D
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
AD1380
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TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Theory of Operation ........................................................................ 6
Description of Operation ................................................................ 7
Gain Adjustment .......................................................................... 7
Zero Offset Adjustment ............................................................... 7
Timing............................................................................................ 7
REVISION HISTORY
6/05—Rev. C to Rev. D
U
pdated Format................................................................. Universal
Updated Outline Dimensions....................................................... 12
5/03—Rev. B to Rev. C
moved serial output function and updated
Re
format.................................................................................. Universal
Change to Product Description...................................................... 1
Change to Functional Block Diagram ........................................... 1
Change to Figure 5 ..........................................................................4
Deleted Text from Digital Output Data section ........................... 5
Deleted Figure 7 and Renumbered Remainder of Figures.......... 5
Updated Outline Dimensions......................................................... 8
Digital Output Data ......................................................................8
Input Scaling ..................................................................................8
Calibration (14-Bit Resolution Examples).................................9
Grounding, Decoupling and Layout Considerations ...............9
Applications..................................................................................... 11
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
Rev. D | Page 2 of 12
AD1380
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SPECIFICATIONS
Typical at TA = 25°C, VS = 15 V, 5 V, combined sample-and-hold ADC, unless otherwise noted.
Table 1.
AD1380JD AD1380KD
Model Min Typ Max Min Typ Max Unit
RESOLUTION 16 16 Bits
ANALOG INPUTS
Bipolar ±2.5 ±2.5 V
±5 ±5 V
±10 ±10 V
Unipolar 0 to 5 0 to 5 V
0 to 10 0 to 10 V
DIGITAL INPUTS1
Convert Command TTL-compatible, trailing edge of positive 50 ns (min) pulse
Logic Loading 1 1 LSTTL Loads
TRANSFER CHARACTERISTICS2
(COMBINED ADC/SHA)
Gain Error ±0.05
Unipolar Offset Error ±0.02
Bipolar Zero Error ±0.02
Linearity Error ±0.006 ±0.003 % FSR
Differential Linearity Error ±0.003 ±0.003 % FSR
Noise
10 V Unipolar 85 85 μV rms
20 V Bipolar 115 115 μV rms
THROUGHPUT
Conversion Time 14 14 μs
Acquisition Time (20 V Step) 6 6 μs
SAMPLE AND HOLD
Input Resistance 4 4 kΩ
Small Signal Bandwidth 900 900 kHz
Aperture Time 50 50 ns
Aperture Jitter 100 100 ps rms
Droop Rate 50 50 μV/ms
T
to T
MIN
Feedthrough −80 −80 dB
DRIFT (ADC AND SHA)5
Gain ±20 ±20 ppm/°C
Unipolar Offset ±2 ±5 ±2 ±5 ppm/°C
Bipolar Zero ±2 ±5 ±2 ±5 ppm/°C
No Missing Codes (Guaranteed) 0 to +70 (13 Bits) 0 to +70 (14 Bits) °C
DIGITAL OUTPUTS (TTL-COMPATIBLE)
All Codes Complementary 5 5 LSTTL Loads
Clock Frequency 1.1 1.1 MHz
POWER SUPPLY REQUIREMENTS
Analog Supplies +14.5 +15 +15.5 +14.5 +15 +15.5 V
−14.5 −15 −15.5 −14.5 −15 −15.5 V
Digital Supply +4.75 +5 +5.25 +4.75 +5 +5.25 V
+15 V Supply Current 25 25 mA
−15 V Supply Current 30 30 mA
+5 V Supply Current 15 15 mA
Power Dissipation 900 900 mW
1 1 mV/ms
MAX
3
3
3
Rev. D | Page 3 of 12
±0.1 ±0.05
±0.05 ±0.02
±0.05 ±0.02
3
3
3
±0.1 % FSR4
±0.05 % FSR
±0.05 % FSR
AD1380
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AD1380JD AD1380KD
Model Min Typ Max Min Typ Max Unit
TEMPERATURE RANGE
Specified 0 to 70 0 to 70 °C
Operating −25 to +85 −25 to +85 °C
1
Logic 0 = 0.8 V max; Logic 1 = 2.0 V min for inputs. Logic 0 = 0.4 V max; Logic 1 = 2.4 V min for digital outputs.
2
Tested on ±10 V and 0 V to +10 V ranges.
3
Adjustable to zero.
4
Full-scale range.
5
Guaranteed but not 100% production tested.
Rev. D | Page 4 of 12
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