AD AD10677BWS 16-bit, 65 msps a/d converter Datasheet

16-Bit, 65 MSPS A/D Converter
AD10677
65 MSPS sample rate
80 dBFS signal-to-noise ratio
Transformer-coupled analog input
Single PECL clock source
Digital outputs
True binary format
3.3 V and 5 V CMOS compatible
FUNCTIONAL BLOCK DIAGRAM
AIN
AD10677
AIN
14
ADC
DOUT0
14
ADC
14
ADC
DIGITAL
POSTPROCESSING
APPLICATIONS
Low signature radar
Medical imaging
Communications instrumentation
Instrumentation
Antenna array processing
OUTPUT
DATA BITS
DOUT15
14
ADC
ANALOG
POWER
AGND
+5VA
+3.3VE
AGND
CLOCK
DISTRIBUTION CIRCUIT
DGND +3.3V DGND
ENCODE ENCODE
DIGITAL POWER
03208-B-001
FEATURES
Figure 1
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD10677 is a 16-bit, high performance, analog-to-digital
converter for applications that demand increased SNR levels.
Exceptional noise performance and a typical signal-to-noise
ratio of 80 dBFS are obtained by digitally postprocessing the
outputs of four ADCs. A single analog input and PECL sampling
clock are required as well as 3.3 V and 5 V power supplies.
1. Guaranteed sample rate of 65 MSPS.
2. Input signal conditioning with optimized noise performance.
3. Fully tested and guaranteed performance.
The AD10677 is assembled using a 0.062" thick laminate board
with 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 card fits a 2.2 "× 2.8" PCB specified from 0°C to 70°C.
Rev. B
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: 781.326.8703
© 2003 Analog Devices, Inc. All rights reserved.
AD10677
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................6
Applications....................................................................................... 1
Operating Range ...........................................................................6
General Description ......................................................................... 1
ESD Caution ..................................................................................6
Functional Block Diagram .............................................................. 1
Test Circuits........................................................................................7
Product Highlights ........................................................................... 1
Typical Performance Characteristics ........................................... 10
Revision History ............................................................................... 2
Definition of Specifications ...................................................... 11
AD10677–Specifications ................................................................. 3
Thermal Considerations ........................................................... 12
DC Specifications ......................................................................... 3
Theory of Operation.................................................................. 12
Digital Specifications ................................................................... 4
Analog and Digital Grounding ................................................ 13
AC Specifications ......................................................................... 4
Outline Dimensions ....................................................................... 19
Switching Specifications .............................................................. 5
Ordering Guide .......................................................................... 20
Explanation of Test Levels........................................................... 5
REVISION HISTORY
12/03—Data sheet changed from REV. A to REV.B
Updated format....................................................................Universal
Changes to Table 1 and footnotes.................................................... 3
Changes to Theory of Operation................................................... 12
Changes to Ordering Guide ........................................................... 20
8/03—Data sheet changed from REV. 0 to REV. A
Changes to Specifications ................................................................. 2
Changes to Table 1............................................................................. 4
Changes to Definition of Specifications ....................................... 10
Updated Outline Dimensions ........................................................ 18
Rev. B | Page 2 of 20
AD10677
AD10677–SPECIFICATIONS
DC SPECIFICATIONS
Table 1. AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V; TA = 25°C, Differential Encode = 65 MSPS, CLOAD ≤ 10 pF, unless otherwise noted.
Parameter
RESOLUTION
Offset Error
Gain Error
Differential Nonlinearity (DNL)
Integral Nonlinearity (INL)
TEMPERATURE DRIFT
Offset Error
Gain Error
POWER SUPPLY REJECTION (PSRR)
ANALOG INPUTS (AIN, AIN)1
Differential Input Voltage Range
Differential Input Resistance
Differential Input Capacitance
Input Bandwidth
VSWR 2
POWER SUPPLY 3
Supply Current
IAVCC (AVCC = 5.0 V)
IEVCC (EVCC = 3.3 V)
IVDD (VDD = 3.3 V)
Total Power Dissipation 4
Test Level
Min
I
I
V
V
–0.30
–7
±0.7
±4
Unit
Bits
%FS
%FS
LSB
LSB
V
V
V
13
200
60
ppm/ºC
ppm/ºC
dB
V
V
V
IV
V
2.15
50
2.5
V p-p
Ω
nF
MHz
Ratio
I
I
I
I
Typ
16
+0.12
0.40
+0.30
+7
210
1.04:1
0.95
0.15
0.49
6.86
1
Max
1.05
0.2
0.625
7.5
A
A
A
W
Measurement includes the recommended interface connector.
Input VSWR, see Figure 12.
Supply voltages should remain stable within 65% for normal operation. However, rated ac (harmonics) performance is valid only over the range AVCC = 5.0 V to 5.25 V.
4
Power dissipation measured with encode at rated speed and –1 dBFS analog input at 10 MHz.
2
3
Rev. B | Page 3 of 20
AD10677
DIGITAL SPECIFICATIONS
Table 2. AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V; TA = 25°C, Differential Encode = 65 MSPS, CLOAD ≤ 10 pF, unless otherwise noted.
Parameter
ENCODE INPUTS (ENCODE, ENCODE)
Differential Input Voltage Range
Differential Input Resistance
Differential Input Capacitance
LOGIC OUTPUTS (D15 to D0)
Logic Compatibility
Logic 1 Voltage—ILOAD ≤ 100 mA
Logic 0 Voltage—ILOAD ≤ 100 mA
Output Coding
Series Output Resistance—per Bit
Test Level
Min
IV
V
V
0.4
Typ
Max
Unit
V p-p
Ω
pF
100
160
CMOS
0.9 × VDD
0.4
True Binary
120
IV
IV
V
V
Ω
AC SPECIFICATIONS
Table 3. AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V; TA = 25°C, Differential Encode = 65 MSPS, CLOAD ≤ 10 pF, unless otherwise noted.
Parameter
SNR1
Analog Input
@ –1 dBFS
SINAD 2
Analog Input
@ –1 dBFS
SFDR 3
Analog Input
@ –1 dBFS
Test Level
Min
Typ
2.5 MHz
10 MHz
30 MHz
I
I
I
77.5
77.5
76.5
80
80
78.5
dBFS
dBFS
dBFS
2.5 MHz
10 MHz
30 MHz
I
I
I
77.2
77.2
74.5
79
79
77
dBFS
dBFS
dBFS
2.5 MHz
10 MHz
30 MHz
I
I
I
84
84
79.5
92
92
84
dBFS
dBFS
dBFS
96
dBFS
TWO-TONE4
Analog Input
@ –7 dBFS—IMD
f1 = 10 MHz, f2 = 12 MHz
V
1
Max
Unit
Analog input signal power at –1 dBFS; signal-to-noise (SNR) is the ratio of signal level to total noise (first five harmonics removed). Encode = 65 MSPS. SNR is reported
in dBFS, related back to converter full scale.
2
Analog input signal power at –1 dBFS; signal-to-noise and distortion (SINAD) is the ratio of signal level to total noise + harmonics. Encode = 65 MSPS. SINAD is reported
in dBFS, related back to converter full scale.
3
Analog input signal at –1 dBFS; SFDR is ratio of converter full scale to 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.
Rev. B | Page 4 of 20
AD10677
SWITCHING SPECIFICATIONS
Table 4. AVCC = 5 V, EVCC = 3.3 V, VDD = 3.3 V; TA = 25°C, Differential Encode = 65 MSPS, CLOAD ≤ 10 pF, unless otherwise noted.
Parameter
MAXIMUM CONVERSION RATE
MINIMUM CONVERSION RATE
DUTY CYCLE
ENCODE INPUT PARAMETERS
Encode Period @ 65 MSPS, tENC
Encode Pulse Width High @ 65 MSPS, tENCH
Encode Pulse Width Low @ 65 MSPS, tENCL
ENCODE/DATA (D15:θ)
Propagation Delay, tPDH
Valid Time, tPDL
APERTURE DELAY, tA
APERTURE UNCERTAINTY (JITTER), tJ
PIPELINE DELAYS
Test Level
I
IV
IV
Min
65
Typ
Max
15
60
40
Unit
MSPS
MSPS
%
V
V
V
15.4
7.7
7.7
ns
ns
ns
V
V
V
6.7
7.3
480
500
9
ns
ns
ps
fs rms
Cycles
EXPLANATION OF TEST LEVELS
I.
II.
III.
IV.
V.
VI.
100% production tested.
100% production tested at 25°C and sample tested at specified temperatures.
Sample tested only.
Parameter is guaranteed by design and characterization testing.
Parameter is a typical value only.
100% production tested at 25°C; guaranteed by design and characterization testing for industrial temperature range; 100%
production tested at temperature extremes for military devices.
Rev. B | Page 5 of 20
AD10677
ABSOLUTE MAXIMUM RATINGS
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
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods
may affect device reliability.
Table 5. AD10677 Stress Ratings
Parameter
AVCC to AGND
EVCC to AGND
VDD to DGND
Analog Input Voltage
Analog Input Current
Encode Input Voltage
Digital Output Voltage
Maximum Junction Temperature
Storage Temperature Range Ambient
Maximum Operating Temperature Ambient
Rating
0 V to 7 V
0 V to 6 V
–0.5 V to +3.8
V
0 V to AVCC
25 mA
0 V to 5 V
–0.5 V to VDD
150°C
–65°C to
+150°C
92°C
OPERATING RANGE
Operating Ambient Temperature Range: 0 C to 70 C. See the
Thermal Considerations section.
Table 6. Output Coding (True Binary)
Code
65535
.
.
.
32768
32767
.
.
.
0
AIN (V)
+1.1
.
.
.
0
–0.000034
.
.
.
–1.1
Digital Output
1111 1111 1111 1111
.
.
.
1000 0000 0000 0000
0111 1111 1111 1111
.
.
.
0000 0000 0000 0000
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. B | Page 6 of 20
AD10677
TEST CIRCUITS
t0
N
N+2
N+1
N+3
N+4
N+5
N+6
N+3
N+4
N+5
N+6
N–6
N–5
N–4
ANALOG INPUT
tENCL
N
ENCODE, ENCODE
N+1
N+2
N–9
DATA BITS, D[15:0]
tENCH
tPDH
tPDL
N–8
N–7
03208-B-002
tENC
Figure 2. Timing Diagram
VCH
AVCC
BUF
AIN
200Ω
25Ω
VCL
BUF
500Ω
VCH
AIN
T/H
500Ω
25Ω
VREF
AVCC
500Ω
BUF
×4
T/H
03208-B-003
1:1
VCL
Figure 3. Analog Input Stage
VDD
VDD
P
37.5kΩ
MACROCELL
LOGIC
100Ω
ENC
PECL
DRIVER
03208-B-004
ENC
120Ω
N
Figure 5. Digital Output Stage
Figure 4. Equivalent Encode Input
Rev. B | Page 7 of 20
D0–D15
03208-B-005
EVCC
AD10677
Table 7. Interfaces 1 and 2: Digital Pin Function Descriptions
P1: Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Mnemonic
DGND
DGND
DOUT15
NC
DOUT14
DGND
DOUT13
NC
DOUT12
DGND
DOUT11
NC
DOUT10
DGND
DOUT9
NC
DOUT8
DGND
DGND
NC
Function
Digital Ground
Digital Ground
Data Bit Output
No Connection
Data Bit Output
Digital Ground
Data Bit Output
No Connection
Data Bit Output
Digital Ground
Data Bit Output
No Connection
Data Bit Output
Digital Ground
Data Bit Output
No Connection
Data Bit Output
Digital Ground
Digital Ground
No Connection
P2: Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Table 8. Interface 3: Analog Pin Function Descriptions
P3: Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Mnemonic
+3.3VE
+5.0VA
+3.3VE
+5.0VA
AGND
+5.0VA
AGND
+5.0VA
AGND
AGND
AGND
AIN
AGND
AIN
ENCODE
AGND
ENCODE
AGND
AGND
AGND
Function
Encode Voltage (EVcc)
Analog Voltage (AVcc)
Encode Voltage (EVcc)
Analog Voltage (AVcc)
Analog Ground
Analog Voltage (AVcc)
Analog Ground
Analog Voltage (AVcc)
Analog Ground
Analog Ground
Analog Ground
Analog Input
Analog Ground
Analog Input
Encode Input
Analog Ground
Encode Input
Analog Ground
Analog Ground
Analog Ground
Rev. B | Page 8 of 20
Mnemonic
DGND
DGND
+3.3VD
DOUT0
+3.3VD
DOUT1
+3.3VD
DOUT2
DGND
DOUT3
DGND
DOUT4
DGND
DOUT5
DGND
DOUT6
+3.3VD
DOUT7
+3.3VD
DGND
Function
Digital Ground
Digital Ground
Digital Voltage (VDD)
Data Bit Output
Digital Voltage (VDD)
Data Bit Output
Digital Voltage (VDD)
Data Bit Output
Digital Ground
Data Bit Output
Digital Ground
Data Bit Output
Digital Ground
Data Bit Output
Digital Ground
Data Bit Output
Digital Voltage (VDD)
Data Bit Output
Digital Voltage (VDD)
Digital Ground
AD10677
Top View of Interface PCB Assembly
Dimensions shown in inches
Tolerances:
0.xx = ±10 mils
0.xx = ±5 mils
0.466
P2
MH4
0.960
0.888
2.148
P3
1.223
MH2
1.693
0.433
0.925
0.805
0.900
MH1
0.526
P1
MH3
0.757
INTERFACE NOTES
SUGGESTED INTERFACE MANUFACTURER: SAMTEC
INTERFACE PART NUMBERS FOR P1-P3: FSI-110-03-G-D-AD-K-TR (20-PIN)
HOLES 1–4 ACCOMMODATE 2-56 THREADED HARDWARE. USE FOUR 2-56 NUTS FOR SECURING
THE PART TO INTERFACE PCB.
MANUFACTURER: BUILDING FASTENERS
PART NUMBER: HNSS256
DIGIKEY #: H723-ND
Figure 6. Header Interface Dimensions (Inches)
Rev. B | Page 9 of 20
03208-B-006
0.955
AD10677
TYPICAL PERFORMANCE CHARACTERISTICS
0
–20
–20
–30
–30
–40
–40
–50
–50
–60
–60
–70
–70
–80
–90
–90
–100
–100
–110
–110
–120
–120
2.5
5
7.5
10 12.5 15 17.5 20 22.5 25 27.5 30 32.5
FREQUENCY (MHz)
–130
03208-B-007
0
0
0
10 12.5 15 17.5 20 22.5 25 27.5 30 32.5
0
–0.2
–0.4
–30
AIN = –1dBFS
–40
–0.6
–50
–0.8
–60
dBFS
dBFS
7.5
Figure 10. Two-Tone @ 10.1 MHz and 12.3 MHz
ENCODE = 65MSPS
AIN = 10.1MHz
SNR = 80.22dBFS
SFDR = 94.3dBFS
–20
5
FREQUENCY (MHz)
Figure 7. Single-Tone at 2.5 MHz
–10
2.5
03208-B-010
–80
–130
ENCODE = 65MSPS
AIN = 10.1MHz AND 12.1MHz
IMD = 97.03dBFS
–10
dBFS
dBFS
0
ENCODE = 65MSPS
AIN = 2.3MHz
SNR = 80.1dBFS
SFDR = 96.16dBFS
–10
–70
–1.0
–80
–1.2
–90
–1.4
–100
–1.6
–110
2.5
5
7.5
10 12.5 15 17.5 20 22.5 25 27.5 30 32.5
FREQUENCY (MHz)
–2.0
1.0
10.9
20.8
30.7
40.6 50.5 60.4 70.3
FREQUENCY (MHz)
80.2
90.1 100.0
03208-B-011
0
03208-B-008
–130
1000.0
03208-B-012
–1.8
–120
Figure 11. Gain Flatness
Figure 8. Single-Tone at 10 MHz
2.0
0
ENCODE = 65MSPS
–10 AIN = 31.7MHz
–20 SNR = 78.95dBFS
SFDR = 85.5dBFS
–30
1.9
1.8
1.7
–40
1.6
VSWR
dBFS
–50
–60
–70
1.5
1.4
–80
1.3
–90
–100
1.2
–110
1.1
–120
1.0
0
2.5
5
7.5
10 12.5 15 17.5 20 22.5 25 27.5 30 32.5
FREQUENCY (MHz)
03208-B-009
–130
Figure 9. Single-Tone at 32 MHz
Rev. B | Page 10 of 20
0.1
1.0
10.0
FREQUENCY (MHz)
100.0
Figure 12. Analog Input VSWR
AD10677
100
96
90
94
80
92
SFDR 2.5MHz
70
90
88
SNR 30MHz
SFDR 30MHz
dBc
dBc
60
50
SFDR 10MHz
40
SFDR
86
84
SNR 2.5MHz
30
82
20
SNR
80
10
78
–60
–50
–40
–30
–20
–10
0
FUNDAMENTAL LEVEL (dBFS)
76
03208-B-013
–70
0
5
10
15
20
25
30
35
ANALOG INPUT FREQUENCY (MHz)
Figure 13. SFDR and SNR vs. Analog Input Level
03208-B-014
SNR 10MHz
0
–80
Figure 14. SFDR and SNR vs. Analog Input Frequency
DEFINITION OF SPECIFICATIONS
Analog Bandwidth
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by the FFT analysis) is
reduced by 3 dB.
Output Propagation Delay
The delay between the 50% point of the rising edge of the
ENCODE command and the time when all output data bits are
within valid logic levels.
Aperture Delay
The delay between the 50% point on the rising edge of the
ENCODE command and the instant at which the analog input
is sampled.
Power Supply Rejection Ratio
The ratio of a change in output offset voltage to a change in
power supply voltage.
Aperture Uncertainty (Jitter)
The sample-to-sample variation in aperture delay.
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
Integral Nonlinearity
The deviation of the transfer function from a reference line
measured in fractions of 1 LSB using a best straight line
determined by a least square curve fit.
Encode Pulse Width/Duty Cycle
Pulse width high is the minimum amount of time the ENCODE
pulse should be left in a Logic 1 state to achieve rated
performance; pulse width low is the minimum time the
ENCODE pulse should be left in a low state. At a given clock
rate, these specifications define an acceptable encode duty cycle.
Harmonic Distortion
The ratio of the rms signal amplitude to the rms value of the
worst harmonic component.
Minimum Conversion Rate
The encode rate when the SNR of the lowest analog signal
frequency drops by3 dB or less below the guaranteed limit.
Maximum Conversion Rate
The encode rate at which parametric testing is performed.
Signal-to-Noise-and-Distortion (SINAD)
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral
components, including the first five harmonics and dc. May be
reported in dBc (i.e., degrades as signal levels is lowered) or in
dBFS (always related back to converter full scale).
Signal-to-Noise Ratio (SNR)
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral
components, excluding the first five harmonics and dc. May be
reported in dBc (i.e., degrades as the signal level is lowered) or
in dBFS (always related back to converter full scale).
Spurious-Free Dynamic Range (SFDR)
The ratio of the rms signal amplitude to the rms value of the
peak spurious spectral component. The peak spurious
component may or may not be a harmonic. SFDR may be
reported in dBc (i.e., degrades as signal level is lowered) or in
dBFS (always related back to converter full scale).
Two-Tone Intermodulation Distortion Rejection (IMD)
The ratio of the rms value of an input tone to the rms value of
the worst third-order intermodulation product; reported in dBc.
Voltage Standing-Wave Ratio (VSWR)
The ratio of the amplitude of the elective field at a voltage
maximum to that at an adjacent voltage minimum.
Rev. B | Page 11 of 20
AD10677
THERMAL CONSIDERATIONS
Due to the high power nature of the part, it is critical that the
following thermal conditions be met for the part to perform to
data sheet specifications. This also ensures that the maximum
junction temperature (150°C) is not exceeded.
•
•
Operation temperature (TA) must be within 0° to 70°C.
All mounting standoffs should be fastened to the interface
PCB assembly with 2-56 nuts. This ensures good thermal
paths as well as excellent ground points.
The unit rises to ~72°C (TC) on the heat sink in still air
(0 linear feet per minute (LFM)). The minimum
recommended air flow is100 linear feet per minute (LFM)
in either direction across the heat sink is (see Figure 15).
•
TEMPERATURE (CASE) (°C)
75
analog-to-digital converters. The PECL-to-TTL translator is
used to provide a clock source for the complex programmable
logic device (CPLD).
The digital outputs from the 4 ADCs drive 120 Ω series output
terminators and are applied to the CPLD for postprocessing.
The digital outputs are added together in the complex
programmable logic device through a ripple-carry adder, which
provides the 16-bit data output. The AD10677 provides valid
data following nine pipeline delays. The result is a 16-bit parallel
digital CMOS compatible word coded as true binary.
Input Stage
The user is provided with a single-to-differential transformer
coupled input. The input impedance is 50 Ω and requires a
2.15 V p-p input level to achieve full scale.
70
Encoding the AD10677
65
The AD10677 encode signal must be a high quality, low phase
noise source to prevent performance degradation. The clock
input must be treated as an analog input signal because aperture
jitter may affect dynamic performance. For optimum
performance, the AD10677 must be clocked differentially.
60
55
50
45
Output Loading
40
Take care when designing the data receivers for the AD10677.
The complex programmable logic device’s 16-bit outputs drive
120 Ω series resistors to limit the amount of current that can
flow into the output stage. To minimize capacitive loading, there
should only be one gate on each of the output pins. A typical
CMOS gate combined with the PCB trace has a load of
approximately 10 pF. It should be noted that extra capacitive
loading increases output timing and invalidates timing
specifications. Digital output timing is guaranteed with 10 pF.
30
0
50
100
150
200
AIR FLOW (LFM)
250
300
03208-B-023
35
Figure 15. Temperature (Case) vs. Air Flow (Ambient)
THEORY OF OPERATION
The AD10677 uses four parallel high speed analog-to-digital
converters in a correlation technique to improve the dynamic
range of the ADCs. The technique sums the parallel outputs of
the four converters to reduce the uncorrelated noise introduced
by the individual converters. Signals processed through the high
speed adder are correlated and summed coherently. Noise is not
correlated and sums on an rms basis.
The four high speed analog-to-digital converters employ
3-three-stage subrange architecture. The AD10677 provides
complementary analog input pins, AIN and AIN. Each analog
input is centered around 2.4 V and should swing ±0.55 V
around the reference. Since AIN and AIN are 180 degrees out of
phase, the differential analog input signal is 2.15 V p-p.
The analog input meets a 50 Ω input impedance for easy
interface to commercial cables, filters, and drivers, etc.
The AD10677 encode inputs are ac-coupled to a PECL
differential receiver/driver. The output of the receiver/driver
provides a clock source for a 1:5 PECL clock driver and a
PECL-to-TTL translator. The 1:5 PECL clock driver provides
the differential encode signal for each of the four 4 high speed
Analog and Digital Power Supplies
Care must be taken when selecting a power source. Linear supplies
are recommended. Switching supplies tend to have radiated
components that may be coupled into the ADCs. The AD10677
features separate analog and digital supply and ground currents,
helping to minimize digital corruption of sensitive analog signals.
The +3.3VE supply provides power to the clock distribution
circuit. The +3.3VD supply provides power to the digital output
section of the ADCs, the PCEL-to-TTL translator, and the CPLD.
Separate +3.3VE and +3.3VD supplies are used to prevent
modulation of the clock signal with digital noise. The +5VA
supply provides power to the analog sections of the ADCs.
Decoupling capacitors are strategically placed throughout
the circuit to provide low impedance noise shunts to ground.
The +5VA supply (analog power) should be decoupled to
AGND (analog ground) and +3.3VD (digital power) should be
decoupled to DGND (digital ground). The +3.3VE supply
(analog power) should be decoupled to AGND. The evaluation
board schematic and layout data show a PCB implementation of
the AD10677.
Rev. B | Page 12 of 20
AD10677
ANALOG AND DIGITAL GROUNDING
Evaluation Board
While the AD10677 provides separate analog and digital ground
pins, the device should be treated as an analog component. Proper
grounding is essential in high speed, high resolution systems.
Multilayer printed circuit boards are recommended to provide
optimal grounding and power distribution. The use of power and
ground planes provides distinct advantages. Power and ground
planes minimize the loop area encompassed by a signal and its
return path, minimize the impedance associated with power and
ground paths, and provide a distributed capacitor formed by the
power plane, printed circuit board material, and ground plane.
The AD10677 unit has four metal standoffs (see Figure 6). MH2
is located in the center of the unit and MH1 is located directly
below analog header P3. Both of these standoffs are tied to analog
ground and should be connected accordingly on the next level
assembly for best performance. The two standoffs located near
P1 and P2 (MH3 and MH4) are tied to digital ground and should
be connected accordingly on the next level assembly.
The AD10677 evaluation board provides an easy way to test the
16-bit 65 MSPS A/D converter. The board requires a clock
source, an analog input signal, two 3.3 V power supplies, and a
5 V power supply. The clock source is buffered on the board to
provide the clock for the AD10677, a latch, and a data ready
signal. The ADC digital outputs are latched on-board by a
74LCX16374. The digital outputs and output clock are available
on a 40-pin connector J1. Power is supplied to the board via
uninsulated metal banana jacks.
The analog input is connected via an SMA connector, AIN. The
analog input section provides for a single-ended input option or
a differential input option. The board is shipped in a singleended analog input option. Removing a ground tie at E17
converts the circuit to a differential analog input configuration.
Other Notes
The circuit is configured on a 2.2" × 2.8" laminate board with
three sets of connector interface pads. The pads are configured
in such a way that easy keying is provided to the user. The pads
are made for low profile applications and have a total height of
0.12" after mating. The part numbers for the header mates are
provided in Figure 6. All pins of the analog and digital sections
are described in Table 7 and Table 8.
Table 9. PCB Bill of Material
Item
1
2
3
4
5
6
7
8
9
10
11
12
Quantity
1
1
3
3
6
2
1
1
19
1
4
17
13
14
15
16
6
4
1
1
Reference Designator
J1
U1
L1 to L3
J11 to J13
P1, P2, P8 to P10, P12
U5, U6
U7
R24
R0 to R16, R20, R23
R17
R18, R19, R21, R22
C1, C10 to C13, C16 to C18,
C23 to C26, C29 to C32
C8, C9, C4, C15, C27, C33
J2, J3, J5, J6
A1
AD106xx Evaluation Board
Description
Connector, 40-Position Header, Male Straight
IC, LV 16-Bit D-Type Flip-Flop with 5 V Tolerant IO
Common-Mode Surface-Mount Ferrite Bead 20 Ω
Connector, 1 mm Single Element Interface
Uninsulated Banana Jack All Metal
IC, 3.3 V/5 V ECL Differential Receiver/Driver
IC, 3.3 V Dual Differential LVPECL to LVTTL Translator
RES 0.0 Ω 1/10 W 5% 0805 SMD
RES 51.1 Ω 1/10 W 1% 0805 SMD
RES 18.2 kΩ 1/10 W 1% 0805 SMD
RES 100 Ω 1/10 W 1% 0805 SMD
CAP 0.1 µF 16 V Ceramic X7R 0805
CAP 10 µF 10 V Ceramic Y5V 1206
Connector, SMA Jack 200 Mil STR Gold
Assembly, AD10677BWS
GS04483 (PCB)
Rev. B | Page 13 of 20
Figure 16. Evaluation Board Schematic
C13
0.1µF
16V
C10
0.1µF
16V
03208-B-015
AGND
+5VA
AGND
+3.3VE
+3.3VE
L2
AGND
AGND
2
4
C8
10µF
10V
1
3
+5VA
P2
P9
AGND
+3.3VE
AGND
2
4
R21 R22
100Ω 100Ω
C9
10µF
10V
1
3
8
7
6
5
C12
0.1µF
16V
R30
DNI
C11
0.1µF
16V AGND
C15
10µF
10V
C25
0.1µF
16V
C26
0.1µF
16V
AGND AGND AGND
MC10EL16D
L1
R19
100Ω
AGND
AGND
R18
100Ω
P1
P10
8
7
6
5
MC10EL16D
AGND
NC VCC
D
Q
D
Q
VBB VEE
+3.3VE
R17
U6
18.2kΩ 1
NC VCC
2
D
Q
3
D
Q
4
VBB VEE
1
2
3
4
U5
POWER CONNECTIONS
R20
51.1Ω
J5
ENCODE
R16
51.1Ω
J6
ENCODE
C32
0.1µF
16V
+3.3VE
1 J13
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
2
4
6
8
10
12
14
16
18
20
AGND
C14
10µF
10V
8
7
6
5
E17
R27
DNI
AGND
R28
DNI
R29
DNI
R24
0.0Ω
R23
51.1Ω
R31
DNI
C18
0.1µF
16V
C29
0.1µF
16V
DGND
DRY
AGND
E2
AGND
E6
AGND
E10
AGND
E12
AGND
E18
AGND
E19
DGND
DGND
MH3
OPTIONAL EVALUATION BOARD GROUND TIES
C16
0.1µF
16V
+3.3VD
C17
LATCH 0.1µF
16V
BUFMEM
DGND
BYPASS CAPACITORS
+3.3VD
MH2
AGND AGND
J3
J2
ANALOG
INPUT
E15
DGND
AGND
AGND
DGND
SINGLE-ENDED DIFFERENTIAL
INPUT OPTION INPUT OPTION
DGND
MC100ELT23D
DGND
VCC
Q0
Q1
D1 GND
1
D0
2
D0
3
D1
4
+3.3VD
U7
AGND
MH1
AGND
FSI-110-03-G-D-AD-TR
1
3
5
7
9
11
13
15
17
19
C30
0.1µF
16V
DGND
J12
+5VA
MH4
AGND
E21
E4
C28
0.1µF
16V
DGND
E3
AGND
AGND
C23
0.1µF
16V
+3.3VE
DGND
HEADER 732mm
MH1–4 = DUT MOUNTING HOLES
DRY
2
4
6
8
10
12
14
1
3
5
7
9
11
13
Rev. B | Page 14 of 20
J8
19
17
15
13
11
9
7
5
3
1
19
17
15
13
11
9
7
5
3
1
20
18
16
14
12
10
8
6
4
2
DGND
E20
20
18
16
14
12
10
8
6
4
2
AD10677 PART OUTLINE
SI-110-03-G-D-AD-TR
J11
20
20
19 19
18 18
17 17
16 16
15 15
14
13
14
13
12
12
11 11
10
10
9 9
8
8
7 7
6
6
5 5
4
4
3 3
2
2
1 1
FSI-110-03-G-D-AD-TR
DGND
VCC
VCC
CP2 VCC
OE2 VCC
I15
O15
O14
I14
I13
O13
I12
O12
I11
O11
O10
I10
I9
O9
I8
O8
CP1
OE1
I7
O7
I6
O6
I5
O5
I4
O4
I3
O3
I2
O2
I1
O1
I0
O0
GND GND
GND GND
GND GND
GND GND
U1
DGND
E22
DGND
E13
DGND
P12
P8
DGND
AGND
+3.3VD
12
11
9
8
6
5
3
2
21
15
10
4
42
31
7
18
23
22
20
19
17
16
14
13
DGND
E1
E5
L3
2
4
E11
DGND
C27
10µF
10V
+3.3VD
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
40-PIN
HMS
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
J1
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
C24
0.1µF
16V
DGND
E8
C1
0.1µF
16V
DGND DGND
E9
E7
R8 51.1Ω
R9 51.1Ω
R10 51.1Ω
R11 51.1Ω
R12 51.1Ω
R13 51.1Ω
R14 51.1Ω
R15 51.1Ω
+3.3VD
DGND
DGND
1
3
R25
DNI
R0 51.1Ω
R1 51.1Ω
R2 51.1Ω
R3 51.1Ω
R4 51.1Ω
R5 51.1Ω
R6 51.1Ω
R7 51.1Ω
+3.3VD
BUFMEM
74LCX16374MTD
25
24
26
27
29
30
32
33
35
36
48
1
37
38
40
41
43
44
46
47
28
34
39
45
C31
0.1µF
16V
POWER CONNECTIONS
R30
DNI
DGND
LATCH
DGND
C33
10µF
10V
+3.3VD
DGND
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
AD10677
AD10677
03208-B-017
AD10677/PCP
EVALUATION BOARD
Figure 17. Evaluation Board Mechanical Layout, Top View
Rev. B | Page 15 of 20
03208-B-018
AD10677
Figure 18. Evaluation Board Mechanical Layout, Bottom View
Rev. B | Page 16 of 20
03208-B-019
AD10677
03208-B-020
Figure 19. Evaluation Board Top Layer Copper
Figure 20. Evaluation Board Second Layer Copper
Rev. B | Page 17 of 20
03208-B-021
AD10677
03208-B-022
Figure 21. Evaluation Board Third Layer Copper
Figure 22. Evaluation Board Bottom Layer Copper
Rev. B | Page 18 of 20
AD10677
OUTLINE DIMENSIONS
Dimensions shown in inches
Tolerances:
0.xx = ±10 mils
0.xxx = ±5 mils
Bottom View
2.795
2.745
2.695
0.170
0.120
0.070
a
2.220
2.170
2.120
AD10677BWS
LOT NUMBER
DATA CODE
USA
0.370
0.320
0.270
Top View
Figure 23
Rev. B | Page 19 of 20
0.314
0.264
0.214
AD10677
ORDERING GUIDE
Model
AD10677BWS
AD10677/PCB
Temperature Range
0°C to 70°C
25°C
Package Description
Non-Herm Hybrid Surf Mount (2.2" × 2.8")
Evaluation Board
© 2003 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C03208–0–12/03(B)
Rev. B | Page 20 of 20
Package Option
WS-120