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
DGNDDGND
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.
@ −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.
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
www.BDTIC.com/ADI
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
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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