Linear Technology DC1639A User manual

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DC1639A
ANALOG DEVICES
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1
dc1639f
DEMO MANUAL DC1639
DESCRIPTION
LTC6360
High Speed Op Amp with
True Zero Output
Demonstration circuit 1639 allows quick setup of the
LTC6360 true zero op amp. The op amp is configured as
a unity gain buffer, with landing pads provided to make
other gains configurable. Ample bypass is provided for
both the input supply and for the –0.6V on-chip charge
pump. The recommended 10Ω 330pF output compensa-
tion is provided on board for unity-gain stability. If this
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.
OPERATING PRINCIPLES
compensation is removed, gain bandwidth increases but
the op amp is stable only in gains of four and higher.
Design files for this circuit board are available at
http://www.linear.com/demo
Most op amps which operate on single supplies have
outputs that cannot get all the way to ground. The satu-
ration of their output devices leave 10’s of millivolts of
output voltage error when the output tries to swing to
ground. The LTC6360 has an onboard charge pump that
creates a –0.6V internal supply for the output stage, so
it can swing all the way to ground and even a little below
ground.
QUICK START PROCEDURE
Demonstration circuit 1639 is simple to use, with only one
jumper provided to allow the shutdown option.
1. Set the power supply to 5V, then turn off the power
supply. As shown in Figure 1, connect the +5V lead
from the power supply to the V+terminal of the demo
circuit, and connect the COM side of the supply to the
GND terminal of the demo circuit.
2. Turn on the supply. Note that without input exciatation
the output is very near 0mV, much closer to ground
than most op amps can achieve.
3. You are now free to connect a source to the input and
exercise the LTC6360. The input range is 0V to about
4.25V.(Underhigh frequencylarge signalswing exciata-
tion, you may see some odd behavior as the negative
charge pump voltage begins to safely collapse.)
4. If you want to set the LTC6360 for some other positive
gain, turn off the supply and disconnect the board. Refer
to the schematic in Figure 2. Install appropriate resis-
tors at R7 and R6, and install appropriate impedances
at C7 and R5 (shorts and/or blocking capacitance). The
time domain and frequency responses can be adjusted
using a small capacitance at C8.
5. For inverting gain, install J2 and appropriate passives
in the path to the –input. For inverting gains, the
+input must be biased up at some voltage. Installing
R13 connects the +input to the “EXT_VCM” turret which
is biased nominally at 2V by R11 and R12, or the turret
can be driven with an external supply.
6. Shutdown: The LTC6360 can be shut down by moving
the shunt on JP1 from the “Enable” position to the “Dis-
able” position. It can also be shut down and reactivated
electrically via the SHDN turret, in which case the shunt
on JP1 should be removed entirely.

2
dc1639f
DEMO MANUAL DC1639
Figure 1. Proper Equipment Setup.
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C5 CAP., X7R, 1μF, 16V, 10% 0603 AVX, 0603YC105KAT2A
2 0 C2, C6 CAP., 0805 OPT
3 0 C3, C7 CAP., 0603 OPT
4 3 C4, C10, C13 CAP., X7R, 0.1μF, 25V, 10% 0603 AVX, 06033C104KAT2A
5 0 C8 CAP., 0603, NPO OPT
6 1 C9 CAP., X7R, 0.01μF, 50V, 10% 0603 AVX, 06035C103KAT2A
7 3 C11, C12, C14 CAP., X5R, 10μF, 6.3V, 20% 0805 AVX, 08056D106MAT2A
8 1 C15 CAP.,CERM 330pF, 50V, NPO, 0805 AVX, 08055A331JAT2A
9 0 C16 CAP., 0805, NPO OPT
10 5 E1-E5 TESTPOINT, TURRET, .065" PBF MILL-MAX, 2308-2-00-80-00-00-07-0
11 1 JP1 HEADER, 3 PINS, 2mm SAMTEC, TMM-103-02-L-S
12 1 XJP1 SHUNT, 2mm CENTER SAMTEC, 2SN-BK-G
13 2 J1, J3 CONN, BNC, SMA 50Ω EDGE-LANCH E. F. JOHNSON, 142-0701-851
14 0 J2 CONN, BNC, SMA 50Ω EDGE-LANCH OPT
15 6 R1,R3, R7, R9, R14, R15 RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
16 1 R2 RES., CHIP, 49.9, 1/8W, 1% 0805 VISHAY, CRCW080549R9FKEA
17 0 R4, R6, R10, R13 RES., 0603 OPT
18 0 R5 RES., 0805 OPT
19 1 R8 RES., CHIP, 10, 1/10W, 1% 0603 VISHAY, CRCW060310R0FKEA
20 1 R11 RES., CHIP, 30.1k, 1/10W, 1% 0603 VISHAY, CRCW060330K1FKEA
21 1 R12 RES., CHIP, 20k, 1/10W, 1% 0603 VISHAY, CRCW060320K0FKEA
22 4 MH1-MH4 (STAND-OFF) STAND-OFF, NYLON (SNAP ON), 0.50" TALL KEYSTONE, 8833(SNAP ON)
23 1 U1 LOW NOISE ADC DRIVER W/TRUE ZERO OUTPUT LINEAR TECH., LTC6360CMS8E#TRPBF
24 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT #1639A
25 1 STENCIL FOR TOP SIDE STENCIL STENCIL 1639A
QUICK START PROCEDURE

3
dc1639f
DEMO MANUAL DC1639
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
Figure 2
5 5
4 4
3 3
2 2
1
1
D D
C C
B B A A
- IN
GND
VCM
EXT
ENABLE
OUT
GND
DISABLE
ACMODE
INSTALLR13 = OPEN
Fu1=3R0=3RINSTALL
k01=31RLLATSNITON
DC MODE (SHOWN)
INSTALL
+ IN
SHDN
V+
NOTE: UNLESS OTHERWISE SPECIFIED ALL RESISTORS: OHMS, 0603, 1%, 1/10W
0805
0805
0805
0805
0805
0805 0805
R8 AND C15 ARE NEEDED FOR STABILITY.
**
**
**
*
*
* SEE TABLE BELOW FOR ALTERNATE VALUES
4.75V - 5.25V
2
DEMO CIRCUIT 1639A
11
LOW NOISE ADC DRIVER W / TRUE ZERO OUTPUT
N/A
LTC6360CMS8E
NC
GLENB.
03-29-11
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APPENG.
TECHNOLOGY
Fax: [phone]
Milpitas,CA95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGYHASMADE A BESTEFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIEDSPECIFICATIONS;
HOWEVER,IT REMAINS THE CUSTOMER'SRESPONSIBILITYTO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLYAFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACTLINEAR
TECHNOLOGYAPPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIEDFOR USE WITHLINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
GLENB.PRODUCTION FAB-2 03-29-11
REVISION HISTORY
ETADNOITPIRCSED APPROVEDECO REV
V+
VCC
VCC
V+
C15
330pF
NPO
R13 OPT
E3
R12 20k
C6 OPT
0805
R1
0
C8
OPT NPO
R11 30.1k
U1 LTC6360CMS8E
1
2
3
4 5
6
7
8
9
-IN
OUT
VCC
VDD CPO
CPI
SHDN
+IN
GND
E2
C11 10uF
R15
0
C12
10uF
C4
.1uF
E1
C7 OPT
C5
1uF
C9
.01uF
JP1
1
2
3
J3
SMA
R2
49.9
R7
0
C10 .1uF
R8 10
J1
SMA R3
0
C16
OPT NPO
E4
R9
0
R6 OPT
C1
1uF
C2
OPT 0805
E5
C13
.1uF
R5 OPT
R14
0
J2
SMA
C3
OPT
R10
OPT
R4
OPT
C14 10uF

4
dc1639f
DEMO MANUAL DC1639
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0811 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) 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 LTC 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
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
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
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
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 LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation