Datenblatt für DC2319A Demo Manual von Analog Devices Inc.

l ’ LI” DEMO MANUAL DC2319A TECHNOLOGY L7HEWEAR 1
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DEMO MANUAL DC2319A
Description
LTC6363
Fully Differential Amplifier
The LT C
®
6363 is a low power, low noise differential op amp
with rail-to-rail output swing and good DC accuracy. The
amplifier may be configured to process a fully differential
input signal or to convert a single-ended input signal to
a differential output signal. The differential outputs of the
DC2319A can be configured with a first order RC network
for driving the differential inputs of an ADC. The DC2319A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
can be DC-coupled or AC-coupled. Onboard jumpers con-
figure the DC2319A for dual or single power supply. In
addition, there are multiple optional surface-mount pads
that can be used to change the LTC6363 configuration.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2319A
Table 1. LTC6363 Versions
PART NUMBER DEMO CIRCUIT NUMBER DESCRIPTION
LTC6363 DC2319A-A Gain Set with External Resistors
LTC6363-1 DC2319A-B Internal Gain Resistors G = 1
LTC6363-2 DC2319A-C Internal Gain Resistors G = 2
LTC6363-05 DC2319A-D Internal Gain Resistors G = 0.5
Quick start proceDure
Refer to Figure 1a. Check to ensure that both jumpers, JP1
and JP2, are set as shown. (JP1 to PWR_ON and JP2 to
SINGLE SUPPLY). Power up the DC2319A from a single
power supply, V+ = 5V and GND = 0V. Connect VIN– to
ground using E8. Connect an input voltage to VIN+ using
E7. The differential output voltage can then be measured
on VOUT– and VOUT+ (E9 and E10). The outputs will be
level-shifted to be balanced symmetrical around approxi-
mately 2.5V. The difference between the outputs will be
the gain multiplied by the difference between the inputs.
For a similar setup using a split supply, change the setting
of JP2 to DUAL SUPPLY, and connect a negative supply
to V–. See Figure 1b.
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dc2319af
DEMO MANUAL DC2319A
Quick start proceDure
Figure 1a. DC2319A Connection Diagram (Single Supply)
Figure 1b. DC2319A Connection Diagram (Dual Supply)
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DEMO MANUAL DC2319A
harDware configuration
DC2319A F02
VIN+
VOUT–
VOUT+
V+
V–
VIN–
EXT
VOCM
R2, 1k R4, 1k
R1, 1k R3, 1k
–
+–
+
LTC6363
DC2319A F03
VIN+
VOUT–
VOUT+
V+
V–
VIN–
EXT
VOCM
–
+–
+
LTC6363-X
Internal or External Gain Settings
Table 1 summarizes the gain settings for the various ver-
sions of DC2319A.
The LTC6363 (without suffix) is a non-committed op amp,
which requires external feedback resistors to configure the
gain. On the DC2319A-A, these resistors (R1, R2, R3, R4)
are all set to 1k to configure a gain of G = 1, as shown in
Figure 2. To set other gains, simply replace these resistors
with other values.
The versions of LTC6363 with suffix (LTC6363-1,
LTC6363-2, LTC6363-05) include precision gain resistors
internal to the IC. The IC already sets its own gain, to
G = 1, G = 2 and G = 0.5 respectively, according to the suffix
(see Table 1). Therefore, on DC2319A-B, DC2319A-C and
DC2319A-D, the onboard feedback resistors (R3, R4) are
not populated, and the input resistors (R1, R2) are shorted
to 0Ω, resulting in the circuit of Figure 3.
Figure 3. DC2319A-B/-C/-D with Gain Setting Resistors
Internal to the IC (LTC6363-1/-2/-05)
Figure 2. DC2319A-A with External Gain Setting Resistors (LTC6363)
L7 LINE/“2
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dc2319af
DEMO MANUAL DC2319A
Single-Ended Input to Differential Output
To configure the DC2319A for single-ended input to
differential output, simply connect a DC bias (such as
ground) to VIN– and connect the input signal to VIN+.
The differential output is measured on VOUT+ and VOUT–.
The unused input can also be grounded on the board by
populating R13 or R14.
Differential Input to Differential Output
To configure the DC2319A for differential input to differ-
ential output, simply connect the differential input signal
to VIN+ and VIN– respectively. The differential output is
measured on VOUT+ and VOUT–.
AC-Coupled Applications
In the default configuration, both the inputs and outputs of
the DC2319A are DC-coupled. To AC-couple the DC2319A,
at either the inputs or outputs or both, simply replace
the 0Ω resistors R5/R6/R11/R12 with appropriate value
0603 capacitors.
External Output Common Mode Adjust
The DC2319A is by default configured to bias the output
common mode at the voltage determined by the LTC6363
IC, which is at approximately the mid-point between the
amplifier’s V+ and V– pins. (For example, if single supply
is used, the output common mode will be at half the V+
voltage).
To set a different value for the output common mode
voltage, populate resistors R15 and R16. This will form a
resistor divider in parallel with the resistor divider internal
to the LTC6363 IC.
The most accurate way to set the output common mode
voltage is by applying the desired DC bias to the EXT
VOCM pin at E5. This will overdrive any of the on-chip or
onboard resistor dividers.
Input or Output Filters
There are many 0Ω resistors and non-installed resistors or
capacitors on the DC2319A board which can be populated
by appropriate R and C values to configure lowpass filters
at the inputs or outputs of the amplifier circuit.
Active Feedback Filters
Various optional feedback components (such as R17,
R18, C15, C16, C17, C18) can be populated to configure
differential active feedback filters. This is most relevant
for the DC2319A-A (the version of LTC6363 without in-
ternal gain suffix). The other versions (with internal gain
resistors) do not provide access to the internal amplifier
feedback nodes, so that it is not possible to configure
external feedback filters. See Table 1.
Layout
The DC2319A PCB layout demonstrates the known best-
practices of PCB layout to get the best performance out of
the LTC6363. A ground plane is used, and supply bypass
capacitors are close to the supply pins. Use a symmetrical
layout around the analog inputs and outputs to minimize
the effects of parasitic elements. Shield analog input and
output traces with ground to minimize coupling from other
traces. Feedback traces are as short as possible.
Nevertheless, the DC2319A is a general purpose ap-
plications board with many placeholders for optional
components. After proto-typing a specific design on the
DC2319A, a final PCB layout can be further optimized by
removing the placeholders for the unused components. In
addition, the DC2319A is designed to accommodate both
single supply and dual supply circuits. A PCB design for
a single supply application would connect the amplifier’s
V– pin directly to the copper ground plane and use only one
supply bypass capacitor directly between V+ and ground.
harDware configuration
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DEMO MANUAL DC2319A
JP1: Jumper toggles the LTC6363 between SHDN and
PWR ON.
JP2: Jumper toggles the SUPPLY between DUAL and
SINGLE power supplies. If set to dual supply, connect a
negative supply voltage to V–.
V+: Connect to Positive Power Supply.
GND: Connect to Ground. Available at multiple turrets
on the board, all shorted together internally. Only need
to connect one, others can be used as ground point for
measurements.
V–: Negative Power Supply Voltage. No need to connect
if JP2 is set to single supply.
EXT SHDN: Externally Drives the SHDN Pin. No need to
connect. To turn the amplifier ON and OFF with a logic
signal, remove JP1 (or set to the PWR ON position) and
then connect an external logic signal here to EXT SHDN.
(See LTC6363 data sheet for logic levels)
EXT VOCM: Externally Drives the VOCM Pin. The voltage
on this pin sets the output common mode voltage level.
If left floating (default setting), then an internal resistor
divider develops a voltage that is approximately mid-way
between the LTC6363 V+ and V– supply rails.
VIN+: Connect noninverting input signal to the amplifier
circuit. Available as SMA connector J1 and as turret E7.
VIN–: Connect inverting input signal to the amplifier circuit.
Available as SMA connector J2 and as turret E8.
VOUT–: Measure inverting output signal from the amplifier
circuit. Available as SMA connector J3 and as turret E9.
VOUT+: Measure noninverting output signal from the
amplifier circuit. Available as SMA connector J4 and as
turret E10.
connectors anD Jumpers
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DEMO MANUAL DC2319A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C2 CAP, 0.1µF, X7R, 25V, ±10%, 0805 MURATA, GRM21BR71E104KA01L
2 2 C3, C4 CAP, 4.7µF, X5R, 16V, ±20%, 0805 TAIYO YUDEN, EMK212ABJ475MG-T
3 4 C5, C6, C7, C8 CAP, 0.1µF, X7R, 16V, ±10% 0603 AVX, 0603YC104KAT
4 0 C9 TO C18 CAP, 0603 OPT
5 10 E1 TO E10 TP, TURRET, 0.064" MTG HOLE MILL-MAX, 2308-2-00-80-00-00-07-0
6 2 JP1, JP2 HEADER, 3PIN 1 ROW 0.079CC SULLINS, NRPN031PAEN-RC
7 2 JP1, JP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
8 4 J1, J2, J3, J4 CONN SMA 50Ω EDGE-LAUNCH E.F. JOHNSON 142-0701-851
9 0 R13, TO, R18 RES, 0603 OPT
10 8 R5 TO R12 RES, 0Ω, 1/10W, 1%, 0603 NIC, NRC06ZOTRF
DC2319A-A Required Circuit Components
1 1 DC2319A-1 GENERAL BOM
2 4 R1, R2, R3, R4 RES, 1k, 1/10W 1%, 0603 NIC, NRC06F1001TRF
3 1 U1 I.C., FULLY DIFFERENTIAL AMPLIFIER I.C., LINEAR TECHNOLOGY LTC6363CMS8 #PBF
DC2319A-B Required Circuit Components
1 1 DC2319A-1 GENERAL BOM
2 2 R1, R2, RES, 0Ω, 1/10W, 1%, 0603 NIC, NRC06ZOTRF
3 0 R3, R4 RES, 0603 OPT
4 1 U1 I.C., FULLY DIFFERENTIAL AMPLIFIER I.C., LINEAR TECHNOLOGY LTC6363CMS8-1 #PBF
DC2319A-C Required Circuit Components
1 1 DC2319A-1 GENERAL BOM
2 2 R1, R2, RES, 0Ω, 1/10W, 1%, 0603 NIC, NRC06ZOTRF
3 0 R3, R4 RES, 0603 OPT
4 1 U1 I.C., FULLY DIFFERENTIAL AMPLIFIER I.C., LINEAR TECHNOLOGY LTC6363CMS8-2 #PBF
DC2319A-D Required Circuit Components
11 DC2319A-1 GENERAL BOM
2 2 R1, R2, RES, 0Ω, 1/10W, 1%, 0603 NIC, NRC06ZOTRF
3 0 R3, R4 RES, 0603 OPT
4 1 U1 I.C., FULLY DIFFERENTIAL AMPLIFIER I.C., LINEAR TECHNOLOGY LTC6363CMS8-05 #PBF
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DEMO MANUAL DC2319A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A A
B B
C C
D D
NOTE : UNLESS OTHERWISE SPECIFIED
GND V-
DUAL
V+
SINGLE
PWR_ON
SHDN
VOUT+
VOUT-
EXT
SHDN
GND
VIN+
1. ALL RESISTORS ARE IN OHMS, 0603
ALL CAPACITORS ARE IN MICROFARADS, 0603
VIN-
EXT
VOCM
0805
0805
0805
0805
-B
-D
-C
LTC6363CMS8-1
LTC6363CMS8-2
LTC6363CMS8-05
ASSY U1 R1, R2
*
LTC6363CMS8-A 1K
OPT
OPT
OPT
*
*
*
*
*
MAX ± 6V
R3, R4
1K
0 Ohms
0 Ohms
0 Ohms
GND
GND
V-
V+ V-
V+
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KLPROTOTYPE-1 9 - 08 - 14
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KLPROTOTYPE-1 9 - 08 - 14
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KLPROTOTYPE-1 9 - 08 - 14
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2319A
11
FULLY DIFFERENTIAL AMPLIFIER
N/A
LTC6363CMS8
NC
KL
9 - 08 - 14
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2319A
11
FULLY DIFFERENTIAL AMPLIFIER
N/A
LTC6363CMS8
NC
KL
9 - 08 - 14
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
DEMO CIRCUIT 2319A
11
FULLY DIFFERENTIAL AMPLIFIER
N/A
LTC6363CMS8
NC
KL
9 - 08 - 14
E2E2
J2J2
1
2
3
4
5
C14
OPT
C14
OPT
E5E5
R18
OPT
R18
OPT
R1
1K
R1
1K
C7
0.1uF
C7
0.1uF R10
0
R10
0
C4
4.7uF
C4
4.7uF
R12
0
R12
0
R11
0
R11
0
C11
OPT
C11
OPT
R6
0
R6
0
R3
1K
R3
1K
C3
4.7uF
C3
4.7uF
R9
0
R9
0
R4
1K
R4
1K
C1
0.1uF
C1
0.1uF
R5
0
R5
0
C18
OPT
C18
OPT
J3J3
1
2
3
4
5
R17
OPT
R17
OPT
C5
0.1uF
C5
0.1uF
C9
OPT
C9
OPT
C15
OPT
C15
OPT
C2
0.1uF
C2
0.1uF
R14
OPT
R14
OPT
R15
OPT
R15
OPT
E4E4
E3E3
R7
0
R7
0
C13
OPT
C13
OPT
U1
LTC6363CMS8
U1
LTC6363CMS8
IN-
1
V- 6
VOCM
2
V+
3
OUT+
4OUT- 5
SHDN 7
IN+ 8
JP2
SUPPLY
JP2
SUPPLY
C6
0.1uF
C6
0.1uF
C16
OPT
C16
OPT
E10E10
E9E9
J1J1
1
2
3
4
5
C17
OPT
C17
OPT
E8E8
E7E7
C10
OPT
C10
OPT
R8
0
R8
0
R2
1K
R2
1K
C8
0.1uF
C8
0.1uF
C12
OPT
C12
OPT
R13
OPT
R13
OPT
E6E6
E1E1
JP1JP1
R16
OPT
R16
OPT
J4J4
1
2
3
4
5
L7 LINE/“2
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dc2319af
DEMO MANUAL DC2319A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2015
LT 0915 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
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ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
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arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
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No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
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Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-
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Copyright © 2004, Linear Technology Corporation