LTC2323 [Linear]

Dual 16-Bit/14-Bit/12-Bit, 5Msps/2Msps, Serial, High Speed SAR ADCs;


型号：	LTC2323
厂家：	Linear
描述：	Dual 16-Bit/14-Bit/12-Bit, 5Msps/2Msps, Serial, High Speed SAR ADCs
文件：	总10页 (文件大小：495K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DEMO MANUAL DC1996A

LTC2323/LTC2321

Dual 16-Bit/14-Bit/12-Bit,

5Msps/2Msps, Serial,

High Speed SAR ADCs

DESCRIPTION

Demonstrationcircuit1996AfeaturestheLTC^®2323family.

With up to 5Msps, these differential, dual channel, 16-bit,

serial, high speed successive approximation register

(SAR) ADCs are available in a 28-lead QFN package. The

LTC2323 family has an internal 20ppm/°C reference and

an SPI-compatible serial interface that supports CMOS

and LVDS logic. Note the demo board is configured for

CMOS operation by default; see the note under JP3 for

LVDS operation. The following text refers to the LTC2323,

but applies to all members of the family, the only differ-

ence being the sample rate and the number of bits. The

DC1996A demonstrates the DC and AC performance of

the LTC2323 in conjunction with the DC890 PScope™

data collection board. Alternatively, by connecting the

DC1996A into a customer application, the performance

of the LTC2323 can be evaluated directly in that circuit.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope

is a trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

BOARD PHOTO

DC POWER SUPPLY

–9.5V

GND 9.5V

BPF

HP8642B

DC890

TO PC USB PORT

dc1996a F02

BPF

HP8642B

Figure 1. DC1996A Connection Diagram

dc1996afb

DEMO MANUAL DC1996A

ASSEMBLY OPTIONS

Table 1. DC1996A Assembly Options

VERSION

U1 PART NUMBER

LTC2323CUFD-16#PBF

LTC2321CUFD-16#PBF

LTC2323CUFD-14#PBF

LTC2321CUFD-14#PBF

LTC2323CUFD-12 #PBF

LTC2321CUFD-12#PBF

MAX CONVERSION RATE

# OF BITS

MAX CLOCK FREQUENCY

110MHz

DC1996A-A

DC1996A-B

DC1996A-C

DC1996A-D

DC1996A-E

DC1996A-F

5Msps

2Msps

5Msps

2Msps

5Msps

2Msps

64MHz

110MHz

62MHz

95MHz

58MHz

QUICK START PROCEDURE

Demonstrationcircuit1996Aiseasytosetupandevaluate

for performance. Refer to Figure 1 and follow the proce-

dure below.

The PScope software should recognize the DC1996A

and configure itself automatically.

Click the Collect button (Figure 2) to begin acquiring

data. The Collect button then changes to Pause, which

can be used to stop data acquisition.

Connect the DC1996A to a DC890 USB high speed data

collection board using edge connector P1.

Connect the DC890 to a host PC with a standard USB

A/B cable.

Apply a low jitter signal source to J2 to test channel

2, or to J4 to test channel 1. Note that the DC1996A

is capable of accepting a differential input signal as

well as a single-ended signal. See the Hardware Setup

section for the jumper positions that correspond to

these configurations.

Asaclocksource, applyalowjitter 10dBmsinewaveor

square wave to connector J1. See Table 1 for maximum

clock frequencies. Note that J1 has a 50Ω termination

resistor to ground.

Run the PScope software (Pscope.exe version K73,

or later) supplied with the DC890 or download it from

www.linear.com/software. Complete software doc-

umentation is available from the Help menu. Updates

can be downloaded from the Tools menu. Check for

updates periodically, as new features may be added.

Figure 2. DC1996A PScope Screenshot

dc1996afb

DEMO MANUAL DC1996A

HARDWARE SETUP

SIGNAL CONNECTIONS

JP3 Data Out: Use this jumper to select the data output

format from the LTC2323. The default setting is CMOS.

The output data will not be valid if the jumper is moved

to the LVDS position unless the following changes have

been made:

J1 CLK IN: This input has a 50Ω termination resistor,

and is intended to be driven by a low jitter 10dBm sine or

square wave. To achieve the full AC performance of this

part, the clock jitter should be kept under 2ps. This input

iscapacitivelycoupled so thattheinputclockcanbeeither

0V to 3.3V or 1.65V. This eliminates the need for level

shifting. To run at the maximum conversion rate, apply

the frequency specified in the Table 1.

Install 100Ω S0402 resistors at R26, 75, 76, 99

Reprogram the CPLD through J6 using the program-

ming file LTC2323.pof found at:

http://www.linear.com/demo/DC1996A

J2 Ch2+ Input: In the single-ended configuration, this is

the channel 2 signal input. For differential operation, this

serves as the positive channel 2 signal input.

Move JP3 to the LVDS position.

JP4 –IN2 Coupling: Use this jumper to select AC- or DC-

coupling of the signal applied to J3. The default setting

is DC. At very low input frequencies, using AC-coupling

may degrade the distortion performance.

J3 Ch2– Input: This input is used only for differential

operation. It serves as the negative channel 2 signal input.

J4 Ch1+ Input: In the single-ended configuration, this is

the channel 1 signal input. For differential operation, this

serves as the positive channel 1 signal input.

JP5 +IN1 Coupling: Use this jumper to select AC- or DC-

coupling of the signal applied to J4. The default setting

is DC. At very low input frequencies, using AC-coupling

may degrade the distortion performance.

J5 Ch1– Input: This input is used only for differential

operation. It serves as the negative channel 1 signal input.

JP6 CM1: Use this jumper to set the DC bias point for the

signal applied to J4 when JP5 (+IN1 coupling) is in the

AC position. The default setting is ADC. The EXT setting

allows the use of an externally applied common mode

voltage applied at E1 (EXT_CM1).

J6 FPGA Program: Factory use only.

J7 JTAG: Factory use only.

JP1 +IN2 Coupling: Use this jumper to select AC- or DC-

coupling of the signal applied to J2. The default setting

is DC. At very low input frequencies, using AC-coupling

may degrade the distortion performance.

JP7 CM2: Use this jumper to set the DC bias point for the

signal applied to J2 when JP1 (+IN2 coupling) is in the

AC position. The default setting is ADC. The EXT setting

allows the use of an externally applied common mode

voltage applied at E2 (EXT_CM2).

JP2 Mode: Use this jumper to select the signal input mode

for the channel 2 input of the LTC2323. The default setting

is Diff. The Diff setting accepts a single-ended signal from

J2 and applies it as a differential signal to channel 2 of the

LTC2323. The Bip setting accepts a single-ended signal

from J2 and applies it as a single-ended bipolar signal to

channel 2 of the LTC2323. The Uni setting also accepts a

single-ended signal from J2, but applies it as a unipolar

signal to channel 2 of the LTC2323.

JP8 Mode: Use this jumper to select the signal input mode

for the channel 1 input of the LTC2323. The default setting

is Diff. The Diff setting accepts a single-ended signal from

J4 and applies it as a differential signal to channel 1 of the

LTC2323. The Bip setting accepts a single-ended signal

from J4 and applies it as a single-ended bipolar signal to

channel 1 of the LTC2323. The Uni setting also accepts a

single-ended signal from J4, but applies it as a unipolar

signal to channel 1 of the LTC2323.

dc1996afb

DEMO MANUAL DC1996A

HARDWARE SETUP

JP9 –IN1 Coupling: Use this jumper to select AC- or DC-

coupling of the signal applied to J5. The default setting

is DC. At very low input frequencies, using AC-coupling

may degrade the distortion performance.

JP11 VDD: Use this jumper to select the VDD supply volt-

age. The default setting is 5V. The 3.3V setting selects a

3.3V supply voltage.

JP12 EEPROM: Factory use only.

JP10 VCCIO: Use this jumper to select the VCCIO sup-

ply voltage. The default setting is 2.5V. The 1.8V setting

selects a 1.8V supply voltage.

JP13 OSC: Use this jumper to enable the onboard encode

clock source. The default setting is OFF. The ON setting

energizesthissource. RefertotheDC1996Aschematicfor

additional passive elements required to use the onboard

source.

PARTS LIST

ITEM QTY REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

Required Circuit Components

20 C1, C2, C4, C5, C9, C11, C13, C18, C19,

CAP., X7R, 0.1µF, 16V, 10%, 0603

NIC, NMC0603X7R104K16TRPF

NIC, NMC0603X5R106M6.3TRPF4KF

OPT

C22, C23, C29, C37, C51, C52, C58, C59,

C82, C129, C130

24 C3, C6, C16, C17, C20, C21, C24-C26,

C28, C30, C34, C47-C50, C53, C54, C57,

C61, C70, C76, C79, C81

CAP., X5R, 10µF, 6.3V, 20%, 0603

C7, C8, C10, C14, C27, C35, C36, C40,

C41, C60

CAP., 0603

C12, C41

CAP., NPO, 200pF, 16V, 5%, 0603

MURAA, GRM1885C1H201JA01D

TDK, C1608X7R1E105K

12 C15, C32, C38, C39, C43, C45, C65, C67, CAP., X7R, 1µF, 25V, 10%, 0603

C68, C71, C74, C77

C31, C33, C55, C56, C106, C119

CAP., X5R, 4.7µF, 6.3V, 10%, 0603

CAP., X5R, 2.2µF, 10V, 10%, 0603

CAP., X7R, 47µF, 10V, 10%, 1210

CAP., X7R, 0.01µF, 6.3V, 10%, 0603

CAP., X7R, 10µF, 10V, 10%, 0805

CAP., X5R, 3.3µF, 6.3V, 10%, 0603

CAP., X7R, 0.1µF, 16V, 10%, 0402

CAP., X5R, 47µF, 6.3V, 20%, 0805

CAP., X7R, 0.01µF, 16V, 10%, 0402

CAP., X7R, 1nF, 16V, 10%, 0402

CAP., X7R, 22nF, 16V, 10%, 0402

CAP., X7R, 4.7nF, 16V, 10%, 0402

CAP., NP0, 10pF, 16V, 10%, 0402

CAP., TANT, 470µF 10V, 20%, 7343

CAP., X7R, 2.2nF, 16V, 10%, 0402

AVX, 06036D475KAT2A

C42, C44

MURATA, GRM188R61A225KE34D

MURATA, GRM32ER71A476KE15L

MURATA, GRM188R70J103KA01D

MURATA, GRM21BR71A106KE51L

AVX, 06036D335KAT2A

C62

C63, C69, C72, C75, C78

C64, C66, C73

C80

28 C83-C104, C108, C122-C126

NIC, NMC0402X7R104K16TRPF

TAIYO YUDEN, JMK212BJ476MG-T

NIC, NMC0402X7R103K16TRPF

AVX, 0402YC102KAT2A

C105

C107, C120, C121

C109

C110, C111, C112

C113, C128

C114, C115, C116, C117

C118

AVX, 0402YC223KAT2A

AVX, 0402YC472KAT2A

AVX, 0402YA100KAT2A

AVX, TPSE477M010R0050

AVX, 0402YC222KAT2A

C127

D1, D2, D3, D4

E1-E3, E5, E8-E12

E4, E6, E7

DIODE, SCHOTTKY, 30V, 200mW SOD-323 DIODE INC., BAT54WS-7-F

TEST POINT, TURRET, 0.064"

TEST POINT, TURRET, 0.094"

MILL-MAX, 2308-2-00-80-00-00-07-0

MILL-MAX, 2501-2-00-80-00-00-07-0

dc1996afb

DEMO MANUAL DC1996A

PARTS LIST

ITEM QTY REFERENCE

PART DESCRIPTION

HEADER, 1×3, 0.100"

HEADER, 2×3, 0.100"

HEADER, 2×5, 0.100"

MANUFACTURER/PART NUMBER

SAMTEC, TSW-103-07-L-S

SAMTEC, TSW-103-07-L-D

SAMTEC, TSW-105-07-L-D

11 JP1, JP3-JP7, JP9-JP11, JP13, JP15

JP2, JP8

J6, J7

J1, J2, J3, J4, J5

CONN BNC FEM JACK PC MNT STRGHT

IND, FERRITE CHIP, 390Ω, 2000mA, 1206 MURATA, BLM31PG391SN1L

AMPHENOL CONNEX, 112404

15 R1, R2, R10, R21, R27, R46-R48, R51,

R52, R57, R58, R60, R64, R66

RES., CHIP, 1k, 1/10W, 1%, 0603

PANASONIC, ERJ-3EKF1001V

R3, R7, R11, R22, R23, R25, R28, R29,

R32, R34, R36, R37, R49, R50, R54,

R123

RES., CHIP, 0603

OPT

R4, R17

RES., CHIP, 33Ω, 1/10W, 5%, 0603

RES., CHIP, 0Ω, 1/10W, 0603

PANASONIC, ERJ-3GEYJ330V

PANASONIC, ERJ-3GEY0R00V

11 R5, R6, R12, R20, R24, R30, R31, R35,

R39, R40, R53

R8, R18, R33, R44

RES., CHIP, 49.9Ω, 1/10W, 1%, 0603

RES., CHIP, 49.9Ω, 1/4W, 1%, 1206

RES., CHIP, 0Ω, 1/16W, 0402

PANASONIC, ERJ-3EKF49R9V

PANASONIC, ERJ-8ENF49R9V,

PANASONIC, ERJ-2GE0R00X

PANASONIC, ERJ-3EKF3010V

PANASONIC, ERJ-3EKF1500V

R13, R16, R38, R43

R14, R15, R41, R42

RES., CHIP, 301, 1/10W, 1%, 0603

RES., CHIP, 150, 1/10W, 1%, 0603

RES., CHIP, 0402

R19, R45

R26, R75, R76, R99

R55, R56

R59

RES., CHIP, 3.92k, 1/10W, 1%, 0603

RES., CHIP, 499Ω, 1/10W, 1%, 0603

RES., CHIP, 866Ω, 1/10W, 1%, 0603

RES., CHIP, 3.09k, 1/10W, 1%, 0603

RES., CHIP, 4.02k, 1/10W, 1%, 0603

RES., CHIP, 1.43k, 1/10W, 1%, 0603

RES., CHIP, 33Ω, 1/16W, 5%, 0402

PANASONIC, ERJ-3EKF3921V

PANASONIC, ERJ-3EKF4990V

PANASONIC, ERJ-3EKF8660V

PANASONIC, ERJ-3EKF3091V

PANASONIC, ERJ-3EKF4021V

PANASONIC, ERJ-3EKF1431V

PANASONIC, ERJ-2GEJ330X

R61

R62

R63

R65

33 R69-R72, R77-R98, R100-R104, R119,

R120

R118

RES., CHIP, 1k, 1/16W, 1%, 0402

RES., CHIP, 4.99k, 1/10W, 1%, 0603

RES., CHIP, 10k, 1/16W, 5%, 0402

RES., CHIP, 10k, 1/16W, 5%, 0603

RES., CHIP, 100Ω, 1/10W, 1%, 0603

IC, INVERTER, UHS, SINGLE, SC70-5

IC, 400MHz, AMPLIFIER, MS8

PANASONIC, ERJ-2EKF1001V

PANASONIC, ERJ-3EKF4991V

PANASONIC, ERJ-2GEYJ103V

PANASONIC, ERJ-3GEYJ103V

PANASONIC, ERJ-3EKF1000V

FAIRCHILD, NC7SZ04P5X

R105, R106, R107, R108

R109-R117

R121

R122

U2, U3, U7

U4, U5

LINEAR TECHNOLOGY, LT1819CMS8#PBF

ON SEMI., NL17SZ74USG

IC, FLIP FLOP, D-TYPE LOG, US8

IC, VOLTAGE REFERENCE, MSOP8

U8, U9

LINEAR TECHNOLOGY, LTC6655BHMS8-

4.096#PBF

U10, U21

IC, OP-AMP, MS8

LINEAR TECHNOLOGY, LT6202CS5#PBF

LINEAR TECHNOLOGY, LT1763CS8#PBF

LINEAR TECHNOLOGY, LT1964ES5-SD#PBF

U11, U13, U14, U15

U12

IC, MICROPOWER REGULATOR, SO8

IC, MICROPOWER NEG. REGULATOR,

SOT-23

U16

U17

IC, MICROPOWER REGULATOR, SO8

IC, LINEAR REGULATOR, SO8

LINEAR TECHNOLOGY, LT1763CS8-2.5#PBF

LINEAR TECHNOLOGY, LT3021ES8-1.2#PBF

dc1996afb

DEMO MANUAL DC1996A

PARTS LIST

ITEM QTY REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

U18

IC, EQFP, CYCLONE3, WIRE BOND,

EQFP144

ALTERA, EP3C5E144C7

U19

U20

IC, 4-BIT, FLASH MEMORY, SO8

ALTERA, EPCS4SI8

IC, EEPROM, 2kBIT, 400kHz, 8TSSOP

OSCILLATOR, 106.2500MHz, 3.3V, SMD

MICROCHIP, 24LC024-I/ST

CTS-FREQUENCY CONTROLS, CB3LV-3I-

106M2500

12 SHOWN ON ASSY DWG

MH1-MH4

SHUNT, 0.100", 2POS

SAMTEC, SNT-100-BK-G

STANDOFF, NYLON, 0.25"

KEYSTONE, 8831 (SNAP-ON)

DC1996A-A Required Circuit Components

DC1996A GENERAL BOM

R67, R73

RES., CHIP, 1k, 1/16W, 5%, 0402

I.C., DUAL SAR ADC, QFN28UFD-4X5

PANASONIC, ERJ-2EKF1001V

LINEAR TECHNOLOGY, LTC2323CUFD-16#PBF

DC1996A-B Required Circuit Components

DC1996A GENERAL BOM

R67, R73

RES., CHIP, 1k, 1/16W, 5%, 0402

I.C., DUAL SAR ADC, QFN28UFD-4X5

PANASONIC, ERJ-2EKF1001V

LINEAR TECHNOLOGY, LTC2321CUFD-16#PBF

DC1996A-C Required Circuit Components

DC1996A GENERAL BOM

R68, R73

RES., CHIP, 1k, 1/16W, 5%, 0402

I.C., DUAL SAR ADC, QFN28UFD-4X5

PANASONIC, ERJ-2EKF1001V

LINEAR TECHNOLOGY, LTC2323CUFD-14#PBF

DC1996A-D Required Circuit Components

DC1996A GENERAL BOM

R68, R73

RES., CHIP, 1k, 1/16W, 5%, 0402

I.C., DUAL SAR ADC, QFN28UFD-4X5

PANASONIC, ERJ-2EKF1001V

LINEAR TECHNOLOGY, LTC2321CUFD-14#PBF

DC1996A-E Required Circuit Components

DC1996A GENERAL BOM

R67, R74

RES., CHIP, 1k, 1/16W, 5%, 0402

I.C., DUAL SAR ADC, QFN28UFD-4X5

PANASONIC, ERJ-2EKF1001V

LINEAR TECHNOLOGY, LTC2323CUFD-12#PBF

DC1996A-F Required Circuit Components

DC1996A GENERAL BOM

R67, R74

RES., CHIP, 1k, 1/16W, 5%, 0402

I.C., DUAL SAR ADC, QFN28UFD-4X5

PANASONIC, ERJ-2EKF1001V

LINEAR TECHNOLOGY, LTC2321CUFD-12#PBF

dc1996afb

DEMO MANUAL DC1996A

SCHEMATIC DIAGRAMS

C P

2 T U O F E R 2 N T R F E R

1 T U O F E R 1 N T R F E R

2 6

1 2

2 7

1 1

V B Y P 2

2 4

1 3

V B Y P 1

G N D

2 9

2 3

1 0

G N D

V D D 2

V D D 1

G N D

O V D D

G B F E R

1 4

2 5

2 8

S D V L

dc1996afb

DEMO MANUAL DC1996A

SCHEMATIC DIAGRAMS

G N D

A G N D

G N D

dc1996afb

DEMO MANUAL DC1996A

SCHEMATIC DIAGRAMS

Y A R R A

M O

E E P R

V C C G N D

dc1996afb

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.

DEMO MANUAL DC1996A

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstrationboard(DEMOBOARD)kitbeingsoldorprovidedbyLinearTechnologyisintendedforuseforENGINEERINGDEVELOPMENT

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

dc1996afb

LT 0414 REV B • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

 LINEAR TECHNOLOGY CORPORATION 2014

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

LTC2323 [Linear]

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