DC1639A - ANALOG DEVICES - Datasheet.Live

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. (Under high frequency large signal swing 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.

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

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

D D

C C

B B

A A

- IN

GND

VCM

EXT

ENABLE

OUT

GND

DISABLE

AC MODE

INSTALLR13 = OPEN

Fu1 = 3R0 = 3RINSTALL

k01 = 31RLLATSNI TON

DC MODE (SHOW N)

INSTALL

+ IN

SHDN

V+

NOTE: UNLESS OTHERWISE SPECIFIED ALL

RESISTORS: OHMS, 0603, 1%, 1/10W

0805

0805 0805

R8 AND C15 ARE NEEDED

FOR STABILITY.

* SEE TABLE BELOW FOR ALTERNATE VALUES

4.75V - 5.25V

DEMO CIRCUIT 1639A

LOW NOISE ADC DRIVER W / TRUE ZERO OUTPUT

N/A

LTC6360CMS8E

GLEN B.

03-29-11

SIZE

DATE:

.VER.ON CI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarth y Bl vd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTI C E

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEET S CUS TO ME R- SU PPLIED SPECI FICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILIT Y TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AF FE CT CI RCUIT

PERFORMANCE OR RELIABILIT Y. C ONTA CT L INE AR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASS IS TANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

GLEN B.PRODUCTION FAB-2 03-29-11

REVISION HISTORY

ETADNOITPIRCSED APPROVEDECO REV

V+

VCC

V+

C15

330pF

NPO

R13

OPT

R12

20k

OPT

0805

OPT

NPO

R11

30.1k

LTC6360CMS8E

4 5

-IN

OUT

VCC

VDD CPO

CPI

SHDN

+IN

GND

C11

10uF

R15

C12

10uF

.1uF

OPT

1uF

.01uF

JP1

SMA

49.9

C10

.1uF

SMA R3

C16

OPT

NPO

OPT

1uF

OPT

0805

C13

.1uF

OPT

R14

SMA

OPT

R10

OPT

C14

10uF

dc1639f

DEMO MANUAL DC1639

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

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