Evaluation Board User’s Guide for
ADC12V170: 12-Bit, 170 MSPS Analog to Digital Converter
with LVDS Outputs
N
Rev 0.0
October 2007
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ADC12V170 Evaluation Board User’s Guide
The location and description of the components on the
ADC12V170 evaluation board can be found in Figure 1
as well as Section 5.0 (Schematic) and Section 7.0 (Bill
of Materials) of this user’s guide.
1.0 Introduction
The ADC12V170 Evaluation Board is designed to
support the ADC12V170 12-bit 170 Mega Sample Per
Second (MSPS) Analog to Digital Converter with LVDS
Outputs.
3.0 Quick Start
The ADC12V170 Evaluation Board comes in two
versions:
The ADC12V170 evaluation board enables easy set up
for evaluating the performance of the ADC12V170.
1. ADC12V170HFEB (high frequency version)
for input frequencies greater than 150 MHz.
If the WaveVision data acquisition and data analysis
system is to be used for capturing data, please follow
the Quick Start Guide in the WaveVision User’s Guide
to install the required software and to connect the
WaveVision Digital Interface Board to the PC and to
the ADC12V170 evaluation board. Please note that the
ADC12V170 evaluation board is only compatible with
National Semiconductor’s WaveVision 5.1 and higher
Signal Path Digital Interface boards.
2. ADC12V170LFEB (low frequency version) for
input frequencies less than 150 MHz.
The digital data from the ADC12V170 evaluation board
can be captured with a suitable instrument, such as a
logic analyzer, or with National Semiconductor’s
WaveVision signal path data acquisition hardware and
software platform. The ADC12V170 evaluation board
can be connected to the data acquisition hardware
through the FutureBus connector (schematic reference
designator FB).
3.1 Evaluation Board Jumper Positions
The ADC12V170 evaluation board jumpers should be
configured as follows. Please refer to Figure 1 for the
exact jumper locations.
1. J1 on the reverse of the board should be shorted.
2. The PD jumper places the ADC12V170 into either
powerdown or sleep mode. Table 1 below shows
how to select between the power modes.
The ADC12V170 is compatible with National
Semiconductor’s WaveVision 5.1 and higher Signal
Path Digital Interface Board and associated
WaveVision software.
Please note that the
ADC12V170 board is not compatible with previous
versions of the WaveVision hardware (WaveVision 4.x
Digital Interface Boards).
PD Jumper Mode
Setting
Open
1-2
3-4
Normal Operation
Power-down
Sleep
The WaveVision hardware and software package
allows fast and easy data acquisition and analysis. The
WaveVision hardware connects to a host PC via a USB
cable and is fully configured and controlled by the latest
Table 1. CLK_SEL/DF Selection Table
WaveVision software.
The latest version of the
3. CLK_SEL/DF pin jumpers select the output data
format (2’s complement or offset binary) and clock
mode (single-ended or differential). Table 2 below
shows how to select between the clock modes and
WaveVision software is included in this evaluation kit
on a CD-ROM. The WaveVision 5.1 Signal Path Digital
Interface hardware is available through the National
Semiconductor website (part number: WAVEVSN 5.1).
output data formats.
Please note that the
ADC12V170 evaluation board is delivered with the
ADC12V170 clock input configured for single-
ended operation and Offset Binary output data
format (Jumper 7-8).
2.0 Board Assembly
Each evaluation board from the factory is configured for
single-ended clock operation and is populated with an
analog input network which has been optimized for one
of two analog input frequencies ranges:
CLK_SEL/DF Clock Mode
Jumper
Setting
Output Data
Format
1. ADC12V170HFEB (high frequency version)
for input frequencies greater than 150 MHz.
1-2
3-4
5-6
7-8*
Differential
Differential
Single-Ended
Single-Ended
2’s Complement
Offset Binary
2’s Complement
Offset Binary
2. ADC12V170LFEB (low frequency version) for
input frequencies less than 150 MHz.
* As assembled from factory.
Please refer to the input circuit configurations
described in the Analog Input Section (4.2) of this
guide.
Table 2. CLK_SEL/DF Selection Table
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ADC12V170 Evaluation Board User’s Guide
by filtering out the broadband noise of the clock source.
All results in the ADC12V170 datasheet are obtained
with a tunable bandpass filter made by Trilithic, Inc. in
the clock signal path.
3.2 Connecting Power and Signal Sources
1. To power the ADC12V170 evaluation board,
connect a 5.0V power supply capable of supplying
up to 500mA to the green power connector labeled
“+5V” which is located along the bottom edge of
the ADC12V170 evaluation board.
2. Use the FutureBus connector (FB) to connect the
ADC12V170 evaluation board to the instrument
being used to capture the data from the evaluation
board. If the WaveVision Digital Interface Board is
being used for data capture, please consult the
WaveVision User’s Guide for details on installing
and operating the WaveVision hardware and
software system.
The noise performance of the ADC12V170 can be
improved further by making the edge transitions of the
clock signal entering the ADC clock input (pin 11,
CLK+) very sharp. The ADC12V170 evaluation board
is assembled with
a
high speed buffer gate
(NC7WV125K8X, schematic reference designator U2)
in the clock input path to provide a sharp clock edge to
the clock inputs and improve the noise performance of
the ADC. The amplitude of the clock signal from the
NC7WV125K8X high speed buffer is 3.3V.
3. Connect the clock and signal inputs to the
CLK_IN_SE and AIN_XX (where XX = HF or LF)
SMA connectors.
4.2 Analog Input
To obtain the best distortion results (best SFDR), the
analog input network on the evaluation board must be
optimized for the signal frequency being applied.
4.0 Functional Description
For analog input frequencies up to 150 MHz, the circuit
in Figure 2 is recommended. This is the configuration
of the assembled ADC12V170LFEB as it is delivered
from the factory. For input frequencies above 150
MHz, the circuit in Figure 3 is recommended. This is
the configuration of the assembled ADC12V170HFEB
as it is delivered from the factory.
4.1 Clock Input
The clock used to sample the analog input should be
applied to the CLK_IN_SE SMA connector (if using the
single-ended clock mode).
To achieve the best noise performance (best SNR), a
low jitter clock source with total additive jitter less than
150 fs should be used. A low jitter crystal oscillator is
recommended, but a sinusoidal signal generator with
low phase noise, such as the SMA100A from Rohde &
Schwarz or the HP8644B (discontinued) from Agilent /
Hewlett Packard, can also be used with a slight
degradation in the noise performance. When using a
low phase noise clock source, the SNR is primarily
degraded by the broadband noise of the signal
generator. The clock signal generator amplitude is
typically set to +19.9 dBm to produce the highest
possible slew rate, but the SNR performance will be
impacted minimally by lowering the signal generator
amplitude slightly. Placing a bandpass filter between
the clock source and the CLK_IN_SE SMA connector
will further improve the noise performance of the ADC
A low noise signal generator such as the HP8644B is
recommended to drive the signal input of the
ADC12V170 evaluation board. The output of the signal
generator must be filtered to suppress the harmonic
distortion produced by the signal generator and to allow
accurate measurement of the ADC12V170 distortion
performance. A low pass or a bandpass filter is
recommended to filter the analog input signal. In some
cases, a second low pass filter may be necessary. The
bandpass filter on the analog input will further improve
the noise performance of the ADC by filtering the
broadband noise of the signal generator. Data shown
in the ADC12V170 datasheet was taken with a tunable
bandpass filter made by Trilithic in the analog signal
path.
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ADC12V170 Evaluation Board User’s Guide
Figure 2. Analog Input Network of ADC12V170LFEB: FIN < 150 MHz
Figure 3. Analog Input Network of ADC12V170HFEB: FIN > 150 MHz
49.9Ω resistor to provide the necessary common mode
voltage to the differential analog input.
4.3 ADC Reference and Input Common Mode
The internal 1.0V reference on the ADC12V170 is used
to acquire all of the results in the ADC12V170
datasheet. It is recommended to use the internal
reference on the ADC12V170. However, if an external
reference is required, the ADC12V170 is capable of
accepting an external reference voltage between 0.9V
and 1.1V (1.0V recommended). The input impedance
of the ADC12V170 VREF pin (pin 46) is 9 kΩ.
Therefore, to overdrive this pin, the output impedance
of the exernal reference source should be << 9 kΩ.
4.4 Board Outputs
The digitized 12-bit output word from the ADC12V170
evaluation board is presented in interleaved double
data rate (DDR) format. The digital output lines from
the ADC12V170 evaluation board consist of 16 lines
which are arranged into 8 LVDS pairs. These 8 pairs
of lines carry the 12-bit output data (6 pairs), the DRDY
signal which should be used to capture the output data
(1 pair) and the over-range bit (OVR) which indicates
that the digital output has exceeded the maximum
digitizable signal (1 pair).
It is recommended to use the voltage at the VRM pin
(pin 45) of the ADC12V170 to provide the 1.5V
common mode voltage required for the differential
Since the data is presented in interleaved double data
rate (DDR) format, the 12-bit word is output on 6 data
pair lines with half of the data (odd bits: D1+/-, D3+/-,
analog inputs VIN+ and VIN-.
The ADC12V170
evaluation board is factory-assembled with VRM
connected to the transformer center-tap through a
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ADC12V170 Evaluation Board User’s Guide
…, D11+/-) being emitted with one clock edge during
the first half of the clock period and the other half of the
data (even bits: D0+/-, D2+/-, …, D10+/-) being emitted
with the opposite clock edge during the second half of
the clock period. The odd data bits should be captured
with the falling edge of DRDY and the rising edge of
DRDY should be used to capture the even bits of the
data.
DRDY signal which is used to capture the data is also
in LVDS format and it is available at pins A4/D4
(DRDY+/-) on the FutureBus connector. The over-
range bit (OVR) LVDS signal is available on pins
D22/D21 (OVR+/-) on the FutureBus connector.
Please see the Evaluation Board schematic in Section
5.0 and the ADC12V170 datasheet for further details.
4.5 Power requirements.
The data is available on the evaluation board at pins
A5/B5 (MSB +/-) through A10/B10 (LSB +/-) of the
FutureBus connector (schematic reference designator
FB). Please keep in mind that because the data is in
DDR format, pins A5/B5 will carry data bit D11+/-
during the first half of the clock period and these lines
will carry bit D10+/- during the second half of the clock
period. Similarly, pins A10/B10 will carry D1+/- during
the first half of the clock period and these pins will carry
D0+/- during the second half of the clock period. The
Power to the ADC12V170 evaluation board is supplied
through the green power connector labeled “+5V”
which is located along the bottom edge of the board.
Voltage and current requirements are:
• +5V capable of providing up to 500mA (ADC12V170
evaluation board only)
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ADC12V170 Evaluation Board User’s Guide
5.0 Evaluation Board Schematic
Figure 4. Signals
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ADC12V170 Evaluation Board User’s Guide
5.0 Schematic (cont.)
Figure 5. Power Distribution
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ADC12V170 Evaluation Board User’s Guide
6.0 Evaluation Board Layout
Figure 6. Layer 1 - Signal
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ADC12V170 Evaluation Board User’s Guide
6.0 Evaluation Board Layout (cont.)
Figure 7. Layer 2 - Ground
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ADC12V170 Evaluation Board User’s Guide
6.0 Evaluation Board Layout (cont.)
Figure 8. Layer 3 - Power
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ADC12V170 Evaluation Board User’s Guide
6.0 Evaluation Board Layout (cont.)
Figure 9. Layer 4 - Signal
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Item Quantity Schematic Reference
Part Name
24C02
Description
2K SERIAL EEPROM 1.8V
PCB Footprint
SOIC-8
48-LLP
Manufacturer
Atmel
1
2
3
4
5
6
1
1
2
4
1
6
U6
ADC
T6, T10
ADC12V170
ETC1-1-13
AMP_5223514-1
0.1uF
12-Bit, 170 MSPS Analog/Digital Converter with LVDS Outputs
BALUN TRANSFORMER
National Semiconductor
MA/COM
AMP
FB
C75
Z-PACK 2mm FB (Futurebus+) RIGHT ANGLE HEADER CONNECTOR
0.1uF SMD CAP CERAMIC 6.3V X5R 10%
0.1uF SMD CAP CERAMIC 25V X7R 10%
-
sm/c_0201
sm/c_1206
Panasonic - ECG
Panasonic - ECG
C2, C14, C20, C22,
C24, C66
0.1uF
7
21
C9, C15
C26, C27, C29, C31, C33,
0.1uF
0.1uF SMD CAP CERAMIC 10V X5R 10%
0.01uF SMD CAP CERAMIC 16V X7R 10%
sm/c_0402
sm/c_0402
Panasonic - ECG
AVX Corporation
C35, C37, C39, C41,
C43, C45, C47, C49-51,
C53, C59, C71, C72
C10, C12, C28, C30, C32,
8
12
0.01uF
C34, C36, C38, C40, C42
C44, C46
9
1
1
2
9
C13
C74
10uF
2pF
1uF
10uF SMD CAP CERAMIC 10V X5R 20%
2pF SMD CAP CERAMIC 50v +/-0.25pF
1uF SMD CAP CERAMIC 25V X7R 10%
10uF SMD CAP TANTALUM 6.3V 20%
sm/c_1206
sm/c_0402
sm/c_1206
sm/c_3216
Panasonic - ECG
Murata Electronics
Panasonic - ECG
Kemet
10
11
12
C4, C6
C1, C3, C8, C19, C21, C23,
10uF
C48, C52, C54
C11
Kemet
Kemet
13
14
15
16
17
18
19
20
21
22
23
24
25
1
1
2
1
1
1
1
1
1
1
1
4
1
2.2uF
68uF
2.2uF SMD CAP TANTALUM 16V 10%
68uF SMD CAP TANTALUM 6.3V 10%
sm/c_3216
sm/c_7343
C5
L1, L2
Ferrite Bead Core
Jumper 1x8
Jumper 2X2
Jumper 2X4
Shunt
SMD FERRITE BEAD CORE 4.5X3.2X1.8
JUMPER BLOCK USING 8 PIN SIP HEADER
-
Panasonic -ECG
Samtec
Samtec
JTAG
PD
-
2X2 JUMPER BLOCK HEADER CUT TO SIZE FROM 2X6 HEADER
2X4 JUMPER BLOCK HEADER CUT TO SIZE FROM 2X6 HEADER
PLACE SHUNT ACROSS PINS 7-8 ON CLK_SEL/DF JUMPER
1A LOW DROPOUT REGULATOR FOR 5V TO 3.3 V CONVERSION
-
CLK_SEL/DF
-
-
Samtec
-
SOT-223
FCI Electronic
National Semiconductor
National Semiconductor
Phoenix Contact
Phoenix Contact
3M
U1
U3
+5V
-
3.3V Regulator
1.8V Regulator
Power Connector Terminal Block TERMINAL BLOCK 2POS 5.08mm
MICROPOWER/LOW NOISE, 500 mA ULTRA LOW-DROPOUT REGULATOSOIC NARROW -8
-
-
-
-
Power Connector Plug
Bump-on Rubber Feet
Tinylogic Buffer
TERMINAL BLOCK PLUG 2POS 5.08mm
PLACE BUMP ONS AT THE 4 CORNERS, ON BOTTOM OF BOARD
TINYLOGIC ULP-A BUFFER WITH 3-STATE OUTPUT
8-LEAD US8, JEDEC MO-187, CA 3.1 mm WIDE
FILTER LC HIGH FREQ .2UF
MT1-4
U2
Fairchild Semiconductor
26
27
28
29
30
31
32
4
2
9
2
2
3
2
Z1-3, Z6
Noise Suppression Filter
0 ohms
1 kOHM
1806
Murata Electronics
Vishay Dale
Panasonic - ECG
R17, R19
R1-7, R12-13
R14-15
0 OHM SMD RESISTOR
1 kOHM SMD RESISTOR 1/16W 1%
sm/r_0402
sm/r_0402
sm/r_0402
sm/r_0402
sm/r_0402
-
24.9 ohms
33.2 ohms
24.9 OHM SMD RESISTOR 1/16W 1%
33.2 OHM SMD RESISTOR 1/16W 1%
49.9 OHM SMD RESISTOR 1/16W 1%
PCB MOUNTABLE SMA CONNECTOR
Yageo Corporation
Vishay Dale
R26-27
R10, R24-25
AIN_HF,
CLK_IN_SE
49.9 ohms
SMA Input
Yageo Corporation
Emerson Network Power Connectivity
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Item Quantity Schematic Reference
Part Name
24C02
Description
2K SERIAL EEPROM 1.8V
PCB Footprint
SOIC-8
48-LLP
Manufacturer
Atmel
1
2
3
4
5
6
1
1
1
4
1
6
U6
ADC
T7
ADC12V170
ADT1-1WT+
AMP_5223514-1
0.1uF
12-Bit, 170 MSPS Analog/Digital Converter with LVDS Outputs
WIDEBAND RF TRANSFORMER 0.4MHz - 800 MHz
Z-PACK 2mm FB (Futurebus+) RIGHT ANGLE HEADER CONNECTOR
0.1uF SMD CAP CERAMIC 6.3V X5R 10%
0.1uF SMD CAP CERAMIC 25V X7R 10%
National Semiconductor
MINI CIRCUITS
AMP
CD542
-
FB
C75
sm/c_0201
sm/c_1206
Panasonic - ECG
Panasonic - ECG
C2, C14, C20, C22,
C24, C66
0.1uF
7
21
C9, C15
C26, C27, C29, C31, C33,
0.1uF
0.1uF SMD CAP CERAMIC 10V X5R 10%
sm/c_0402
sm/c_0402
Panasonic - ECG
AVX Corporation
C35, C37, C39, C41,
C43, C45, C47, C49-51,
C53, C59, C71, C72
C10, C12, C28, C30, C32,
8
12
0.01uF
0.01uF SMD CAP CERAMIC 16V X7R 10%
C34, C36, C38, C40, C42
C44, C46
9
1
3
2
9
C13
C74, C78-79
10uF
15pF
1uF
10uF SMD CAP CERAMIC 10V X5R 20%
15pF SMD CAP CERAMIC 50v NP0 5%
1uF SMD CAP CERAMIC 25V X7R 10%
10uF SMD CAP TANTALUM 6.3V 20%
sm/c_1206
sm/c_0402
sm/c_1206
sm/c_3216
Panasonic - ECG
Panasonic - ECG
Panasonic - ECG
Kemet
10
11
12
C4, C6
C1, C3, C8, C19, C21, C23,
10uF
C48, C52, C54
C11
13
14
15
16
17
18
19
20
21
22
23
24
25
1
1
2
1
1
1
1
1
1
1
1
4
1
2.2uF
68uF
2.2uF SMD CAP TANTALUM 16V 10%
68uF SMD CAP TANTALUM 6.3V 10%
sm/c_3216
sm/c_7343
Kemet
Kemet
C5
L1, L2
Ferrite Bead Core
Jumper 1x8
Jumper 2X2
Jumper 2X4
Shunt
SMD FERRITE BEAD CORE 4.5X3.2X1.8
JUMPER BLOCK USING 8 PIN SIP HEADER
-
Panasonic -ECG
Samtec
Samtec
JTAG
PD
-
2X2 JUMPER BLOCK HEADER CUT TO SIZE FROM 2X6 HEADER
2X4 JUMPER BLOCK HEADER CUT TO SIZE FROM 2X6 HEADER
PLACE SHUNT ACROSS PINS 7-8 ON CLK_SEL/DF JUMPER
1A LOW DROPOUT REGULATOR FOR 5V TO 3.3 V CONVERSION
-
CLK_SEL/DF
-
-
Samtec
FCI Electronic
National Semiconductor
-
SOT-223
U1
U3
+5V
-
3.3V Regulator
1.8V Regulator
Power Connector Terminal Block TERMINAL BLOCK 2POS 5.08mm
MICROPOWER/LOW NOISE, 500 mA ULTRA LOW-DROPOUT REGULATOSOIC NARROW -8 National Semiconductor
-
-
-
-
Phoenix Contact
Phoenix Contact
3M
Power Connector Plug
Bump-on Rubber Feet
Tinylogic Buffer
TERMINAL BLOCK PLUG 2POS 5.08mm
PLACE BUMP ONS AT THE 4 CORNERS, ON BOTTOM OF BOARD
TINYLOGIC ULP-A BUFFER WITH 3-STATE OUTPUT
8-LEAD US8, JEDEC MO-187, CA 3.1 mm WIDE
FILTER LC HIGH FREQ .2UF
MT1-4
U2
Fairchild Semiconductor
26
27
28
29
30
31
32
4
2
9
4
2
1
2
Z1-3, Z6
Noise Suppression Filter
0 ohms
1 kOHM
1806
Murata Electronics
Vishay Dale
Panasonic - ECG
R17, R19
R1-7, R12-13
R14-15, R24-25
R26-27
0 OHM SMD RESISTOR
1 kOHM SMD RESISTOR 1/16W 1%
sm/r_0402
sm/r_0402
sm/r_0402
sm/r_0402
sm/r_0402
-
24.9 ohms
33.2 ohms
24.9 OHM SMD RESISTOR 1/16W 1%
33.2 OHM SMD RESISTOR 1/16W 1%
49.9 OHM SMD RESISTOR 1/16W 1%
PCB MOUNTABLE SMA CONNECTOR
Yageo Corporation
Vishay Dale
R10
AIN_LF,
CLK_IN_SE
49.9 ohms
SMA Input
Yageo Corporation
Emerson Network Power Connectivity
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ADC12V170 Evaluation Board User’s Guide
The ADC12V170 Evaluation Board is intended for product evaluation purposes only and is not intended for resale to end
consumers, is not authorized for such use and is not designed for compliance with European EMC Directive 89/336/EEC.
WaveVision is a trademark of National Semiconductor Corporation. National does not assume any responsibility for use of any
circuitry or software supplied or described. No circuit patent licenses are implied.
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NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
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perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life
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Tel:
Fax:
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Email: [email protected]
Email: [email protected]
National does not assume any responsibility for any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change
said circuitry and specifications.
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