ANALOG DEVICES AD10678 Service Manual

A
G
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16-Bit, 80 MSPS A/D Converter

FEATURES

80 MSPS sample rate 80 dBFS signal-to-noise ratio Transformer-coupled analog input Single PECL clock source Digital outputs
True bi nary form at
3.3 V and 5 V CMOS-compatible

APPLICATIONS

Low signature radar Medical imaging Communications instrumentation Instrumentation Antenna array processing

GENERAL DESCRIPTION

The AD10678 is a 16-bit, high performance, analog-to-digital converter (ADC) for applications that demand increased SNR levels. Exceptional noise performance and a typical signal-to­noise ratio of 80 dBFS are obtained by digitally postprocessing the outputs of four ADCs. A single analog input and PECL sampling clock and 3.3 V and 5 V power supplies are required.

FUNCTIONAL BLOCK DIAGRAM

NALO
POWER
AIN
AIN
AGND 5VA
3.3VE AGND
ADC
ADC
ADC
ADC
CLOCK DISTRIBUTION CIRCUIT
Figure 1.
AD10678
14
14
DIGITAL
POST-
PROCES-
14
SING
14
DGND DGND
DIGITAL POWERENCODE ENCODE

PRODUCT HIGHLIGHTS

1. Guaranteed sample rate of 80 MSPS.
nput signal conditioning with optimized noise
2. I
performance.
3. F
ully tested and guaranteed performance.
AD10678
0
D
OUT
OUTPUT DATA BITS
D
15
OUT
DRY
3.3V
03376-A-001
The AD10678 is assembled using a 0.062-inch laminate board wi
th three sets of connector interface pads to accommodate analog and digital isolation. Analog Devices recommends using the FSI-110-03-G-D-AD-K-TR connector from Samtec. The overall board fits a 2.2 inch × 2.8 inch PCB specified from 0°C to 70°C.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her 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 ©2006 Analog Devices, Inc. All rights reserved.
AD10678
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TABLE OF CONTENTS

Features .............................................................................................. 1
Test Ci r cu i ts ........................................................................................7
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights........................................................................... 1
Tabl e of Co n t en t s .............................................................................. 2
Revision History ........................................................................... 2
Specifications..................................................................................... 3
DC Specifications ......................................................................... 3
Digital Specifications ................................................................... 3
AC Specifications.......................................................................... 4
Switching Specifications .............................................................. 5
Absolute Maximum Ratings............................................................ 6
Explanation of Test Levels........................................................... 6
Operating Range........................................................................... 6
ESD Caution.................................................................................. 6
Pin Configurations and Function Descriptions ............................8
Typical Perf or m anc e Chara c terist i c s ........................................... 10
Te r mi n ol o g y .................................................................................... 12
Theory of Operation ...................................................................... 13
Thermal Considerations............................................................ 13
Input Stage................................................................................... 13
Encoding the AD10678 ............................................................. 13
Output Loading .......................................................................... 13
Analog and Digital Power Supplies.......................................... 13
Analog and Digital Grounding................................................. 14
Other Notes................................................................................. 14
Evaluation Board ........................................................................ 14
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19

REVISION HISTORY

5/06—Rev. B to Rev. C
Changes to Figure 9.......................................................................... 9
Edits to Table 8................................................................................ 15
Edits to Figure 22.......................................................................... 16
3/05—Rev. A to Rev. B
C
hanges to Figure 1.......................................................................... 1
Changes to Figure 2 and Figure 3................................................... 7
Added Figure 7 to Figure 9.............................................................. 8
Reformatted Table 7 ......................................................................... 8
Changes to Figure 10........................................................................ 9
Reformatted Theory of Operation Section ................................. 13
Changes to Figure 22...................................................................... 15
12/03—Rev. 0 to Rev. A
Updated format...................................................................Universal
Changes to AC Specifications Table Footnotes ............................ 4
Changes to Table 1............................................................................ 3
Changes to Table 3............................................................................ 6
Changes to Figure 11...................................................................... 10
Changes to Theory of Operation.................................................. 13
Changes to Ordering Guide.......................................................... 20
2/03—Revision 0: Initial Version
Rev. C | Page 2 of 20
Preliminary Technical Data AD10678
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SPECIFICATIONS

DC SPECIFICATIONS

AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V, TA = 25°C, differential encode = 80 MSPS, C
Table 1.
Parameter Test Level Min Typ Max Unit
RESOLUTION 16 Bits
Offset Error I –0.30 +0.12 +0.30 %FS Gain Error I –7 +7 %FS Differential Nonlinearity (DNL) V ±0.7 LSB Integral Nonlinearity (INL) V ±4 LSB
TEMPERATURE DRIFT
Offset Error V 13 ppm/°C
Gain Error V 200 ppm/°C POWER SUPPLY REJECTION RATIO (PSRR) V 60 dB ANALOG INPUTS (AIN, AIN)
Differential Input Voltage Range V 2.15 V p-p
Differential Input Resistance V 50 Ω
Differential Input Capacitance V 2.5 nF
Input Bandwidth IV 0.40 220 MHz
2
VSWR POWER SUPPLY
Supply Current
IAVCC (AVCC = 5.0 V) I 0.95 1.1 A IEVCC (EVCC = 3.3 V) I 0.15 0.2 A IVDD (VDD = 3.3 V) I 0.49 0.625 A
Total Power Dissipation
1
Measurement includes the recommended interface connector.
2
Input VSWR, see Figure 18.
3
Supply voltages should remain stable within ±5% for normal operation.
4
Power dissipation measured with encode at rated speed and –6 dBFS analog input at 10 MHz.
3
1
4
V 1.04:1 Ratio
I 6.86 8.0 W
≤ 10 pF, unless otherwise noted.
LOAD

DIGITAL SPECIFICATIONS

AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V, TA = 25°C, differential encode = 80 MSPS, C
Table 2.
Parameter Test Level Min Typ Max Unit
ENCODE INPUTS (ENCODE, ENCODE)
Differential Input Voltage Range IV 0.4 V p-p
Differential Input Resistance V 100 Ω
Differential Input Capacitance V 160 pF LOGIC OUTPUTS (D15 to D0)
Logic Compatibility CMOS
Logic 1 Voltage I
Logic 0 Voltage I
Output Coding True binary
Series Output Resistance per Bit 120 Ω
≤100 mA IV 0.9 × V
LOAD
≤100 mA IV 0.4 V
LOAD
Rev. C | Page 3 of 20
≤ 10 pF, unless otherwise noted.
LOAD
V
DD
AD10678
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AC SPECIFICATIONS

AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V, TA = 25°C, differential encode = 80 MSPS, C
Table 3.
Parameter Test Level Min Typ Max Unit
1
SNR
Analog Input 2.5 MHz I 77.5 80.5 dBFS
@ −6 dBFS 10 MHz I 77.5 80.5 dBFS 30 MHz I 77 80.2 dBFS 70 MHz I 76 78 dBFS
2
SINAD
Analog Input 2.5 MHz I 77.2 80.3 dBFS
@ −6 dBFS 10 MHz I 77.2 80.3 dBFS 30 MHz I 76.6 79.7 dBFS 70 MHz I 74.7 77.4 dBFS
3
SFDR
Analog Input 2.5 MHz I 88 97.2 dBFS
@ −6 dBFS 10 MHz I 88 97.2 dBFS 30 MHz I 84 94.2 dBFS 70 MHz I 81 91.7 dBFS TWO-TONE
Analog Input
@ −7 dBFS IMD
f1 = 10 MHz, f2 = 12 MHz V 96 dBFS
f1 = 70 MHz, f2 = 72 MHz V 84 dBFS
1
Analog input signal power at −6 dBFS; signal-to-noise (SNR) is the ratio of signal level to total noise (first five harmonics removed). Encode = 80 MSPS. SNR is reported
in dBFS, related back to converter full scale.
2
Analog input signal power at −6 dBFS; signal-to-noise and distortion (SINAD) is the ratio of signal level to total noise + harmonics. Encode = 80 MSPS. SINAD is
reported in dBFS, related back to converter full scale.
3
Analog input signal equals −6 dBFS; SFDR is the ratio of the converter full scale to the worst spur.
4
Both input tones at −7 dBFS; two-tone intermodulation distortion (IMD) rejection is the ratio of either tone to the worst third-order intermodulation product.
4
≤ 10 pF, unless otherwise noted.
LOAD
Rev. C | Page 4 of 20
Preliminary Technical Data AD10678
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SWITCHING SPECIFICATIONS

AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V, TA = 25°C, differential encode = 80 MSPS, C
Table 4.
Parameter Test Level Min Typ Max Unit
MAXIMUM CONVERSION RATE I 80 MSPS MINIMUM CONVERSION RATE IV 30 MSPS DUTY CYCLE IV 40 60 % ENCODE INPUTS PARAMETERS
Encode Period @ 80 MSPS, t
ENC
Encode Pulse Width High @ 80 MSPS, t Encode Pulse Width Low @ 80 MSPS, t
ENCH
ENCL
V 12.5 ns V 6.25 ns V 6.25 ns
ENCODE/DATA (D15:D0)
Propagation Delay, t Valid Time, t
PDL
ENCODE/DATA READY
PDH
1
Encode Rising to Data Ready Falling, t Encode Rising to Data Ready Rising, t
DATA READY/DATA
1
Data Ready to Data (Hold Time) t Data Ready to Data (Setup Time) t
APERTURE DELAY, t
A
APERTURE UNCERTAINTY (JITTER), t
DR_F
DR_R
H_DR
S_DR
J
6.7 ns
7.3 ns
12.6 ns
6.4 ns
10 ns 1 ns V 480 ps V 500 fs rms
PIPELINE DELAYS V 10 Cycles
1
Duty cycle = 50%.
≤ 10 pF, unless otherwise noted.
LOAD
Rev. C | Page 5 of 20
AD10678
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ABSOLUTE MAXIMUM RATINGS

Table 5.
Parameter Rating
AVCC to AGND 0 V to 7 V EVCC to AGND 0 V to 6 V V
to DGND –0.5 V to +3.8 V
DD
Analog Input Voltage 0 V to AV Analog Input Current 25 mA Encode Input Voltage 0 V to 5 V Digital Output Voltage –0.5 V to V Maximum Junction Temperature 150°C Storage Temperature Range Ambient –65°C to +150°C Maximum Operating Temperature Ambient 92°C
Table 6. Output Coding (True Binary)
Code AIN (V) Digital Output
65535 +1.1 1111 1111 1111 1111 . . . . . . . . . 32768 0 1000 0000 0000 0000 32767 –0.000034 0111 1111 1111 1111 . . . . . . . . . 0 –1.1 0000 0000 0000 0000
CC
DD
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; 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.

EXPLANATION OF TEST LEVELS

I. 100% production tested. II. 100% p
III. S IV. P
V. P
100% production tested at 25°C; guaranteed by design and c
haracterization testing for industrial temperature range; 100%
production tested at temperature extremes for military devices.
roduction tested at 25°C and sample tested at
specified temperatures.
ample tested only.
arameter is guaranteed by design and characterization
testing.
arameter is a typical value only.

OPERATING RANGE

Operating ambient temperature range: 0°C to 70°C. See the Thermal Considerations section.

ESD 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 this product 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.
Rev. C | Page 6 of 20
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