Linear Technology DC1858A Guida rapida alla configurazione

dc1858af

DEMO MANUAL DC1858A

Description

Low Noise, Low Distortion

Sine Wave Generator for

Testing ADC Demo Boards

Demonstration circuit 1858A is a low noise, low distortion

sine wave generator designed to be used in conjunction

withLinearTechnology16-bitand18-bitADCdemoboards.

Functionally, this board uses a Wien bridge oscillator that

has been level shifted to match the input range of 0V to 5V

16-bitand 18-bit Linear Technology ADC demo boards.The

default oscillator output level is 0.5V to 4.5V. The output

frequency is 2kHz. The output level and frequency can

be adjusted by changing a few resistors and capacitors.

For additional frequencies and output levels see Tables 1

and 2. For a detailed description of this oscillator see

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

AN132. The DC1858A has 5V and ±12V outputs that can

be used to provide power for the ADC demo board under

test and the DC1216A low jitter clock source if required.

The DC1858A combined with the DC1216A, an ADC demo

board and a high speed USB controller (DC718 or DC890)

form a complete ADC evaluation system when used with

LT C ’s PScope™ software.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. DC1858A Typical Connection Diagram

dc1858af

DEMO MANUAL DC1858A

Quick start proceDure

Use the connection diagram of Figure 1. Connect the ADC

demo board to a DC718 or DC890 USB high speed data

collection board (DC718 or DC890 will be determined by

the ADC demo board being tested). Then, connect the

DC718 or DC890 to a host PC with a standard USB A/B

cable. Apply ±12V from the DC1858A power outputs (see

Figure 2) to the plus or ±terminals of the ADC demo board

as required. Connect the SINE OUT (see Figure 3) of the

DC1858A to the analog input of the ADC demo board. (The

SINE OUT output is designed to drive a high impedance

input. Do not use this to drive 50Ω inputs.) Connect a low

jitter clock to the clock input of the demo board. DC1858A

has a 5V output supply available to power the DC1216A

low jitter clock source if desired. (See Figure 1 for con-

nection diagram. A twisted pair or shielded cable from the

DC1858A to the DC1216A power pins is recommended to

minimize interference from the AC adapter.) Plug in the

provided AC adapter.

Download and run the PScope software from www.linear.

com/designtools/software.

Complete software documentation is available from the

Help menu. Updates can be downloaded from the Tools

menu. Check for updates periodically as new features

may be added.

The PScope software should recognize the ADC demo

board and configure itself automatically.

Set the sample rate in Msps to what is appropriate for

the ADC used. The sample size should be set to 32768

for 16-bit ADCs or 131072 for 18-bit ADCs and above.

If synchronous sampling is not used set the window to

Blkmn-Harris 92dB, otherwise select None. Sample rate,

sample size and window are located in the right hand

center section of the PScope window.

Click the Collect button to begin acquiring data. The Collect

button then changes to Pause, which can be clicked to

stop data acquisition. F1 should read approximately 2kHz

and F1 amplitude should read approximately –1dBFS. To

get the best SNR performance it is recommended to turn

on power averaging. The power averaging (MAVG) button

is located at the top of the PScope window. Remember

that to calculate the true SNR, the F1 amplitude has to be

added back to the SNR that PScope displays.

IF THE OSCILLATOR DOESN’T START

Use the supplied non-conductive screwdriver to adjust

the potentiometer through the opening in the box until a

steady 2kHz sine wave with an amplitude of approximately

4.5VP-P is observed. The oscillator has three states, nor-

mal oscillation, oscillation with modulated amplitude,

and no oscillation. It takes only a small change in the

potentiometer to go through all three states so adjust the

potentiometer slowly.

Figure 2. DC1858A Rear Panel

Figure 3. DC1858A Front Panel

dc1858af

DEMO MANUAL DC1858A

Quick start proceDure

Table 1. Amplitude and Offset Options for DC1858A (SNR and THD Taken at fOSC = 2kHz)

ADC FS

Range (V) R22 (kΩ) R18 (kΩ) C11 (µF) Sine Out (VP-P) Offset (V) SNR (dB)* THD (dB)*

0 to 2.5 14 36.5 0.47 2.25 1.25 100 –119

0.5 to 4.5 22.6 12.1 0.47 3.6 2.5 103 –121

0 to 4.096 23.2 17.4 0.47 3.7 2.048 103 –121

0 to 5 28 12.1 0.47 4.5 2.5 104 –118

±2.5 28 ∞ 0.47 4.5 0 104 –119

±5 56.2 ∞ 0.47 9 0 107 –117

±10 118 ∞ 0.1 18 0 100 –107

*SNR and THD measurements made with Stanford Research Model SR1 Audio Analyzer.

Table 2. Frequency Options for DC1858A (SNR and THD Taken at SINE OUT = 4.5VP-P, Offset = 2.5V)

fOSC (kHz) R1 = R8 (kΩ) C10 (µF) C11 (µF) SNR (dB)* THD (dB)*

2 7.87 0.0068 0.47 104 –118

5 3.16 0.0022 0.22 102 –112

10 1.58 0.0012 0.1 102 –112

20 0.787 0.00068 0.047 101 –117

Use 1% metal film resistors and mylar or silver mica capacitors when making modifications, to maintain the low noise, low distortion performance of

this demo board.

*SNR and THD measurements made with Stanford Research Model SR1 Audio Analyzer.

dc1858af

DEMO MANUAL DC1858A

Figure 4. DC1858A PC Board

Quick start proceDure

dc1858af

DEMO MANUAL DC1858A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 13 C1 TO C6, C13

TO C18, C20

CAP, OSCON, 10µF 20V 20% SMT SANYO, 20SVPA10M

2 2 C7, C9 CAP, POLYSTYRENE, 0.01µF, 33V 1% AXIAL LEAD CENTRALAB, 14OMFD33V-J

3 1 C8 CAP, MICA CHIP, 5pF, 100V ±0.5PF 0805 CDE, MC08CA050D-F

4 1 C10 CAP, PPS FILM, 0.0068µF, 16V 5% 0805 PANASONIC, ECHU1C682JX5

5 1 C11 CAP, PLASTIC FILM, 0.47µF, 100V 10% 3022 PANASONIC, ECWU1474KCV

6 1 C12 CAP, PLASTIC FILM, 0.1µF, 16V 5% 1210 PANASONIC, ECHU1C104JX5

7 2 C19, C25 CAP, PLASTIC FILM, 1.0µF, 100V 10% 3925 PANASONIC, ECWU1105KCV

8 1 C22 CAP, TANT, 47µF 35V 20% 7343 KEMET, T495X476K035ATE300/AVX,

TAJE476M035RNJ

9 1 C23 CAP, TANT, 10µF 25V 10% 6032 AVX, TAJC106K025RNJ

10 1 C24 CAP, TANT, 15µF 25V 10% 7343 AVX, TAJD156K025RNJ

11 1 C26 CAP, TANT, 100µF 20V 20% 7361 AVX, TPSE107M020R0200/TPSV107M020R0085

12 2 D1, D2 DIODE, SMALL SIGNAL, SOD323 DIODES INC, 1N4148WS-7-F

13 2 D3, D4 DIODE, SCHOTTKY, 40V 1A SMA ON SEMI, MBRA140T3G

14 5 E1, E2, E3, E4,

TESTPOINT, TURRET, 0.094, PBF MILL MAX, 2501-2-00-80-00-00-07-0

15 2 E6, E7 TEST POINT, TURRET, 0.061 MILL MAX, 2308-2-00-80-00-00-07-0

16 1 J1 CONN RCPT HOUSING 5POS 3.96MM MOLEX, 09-50-1051

17 1 J2 CON, BNC 50Ω, JACK, RIGHT ANGLE PCB MOUNT MOLEX, 731385033

18 1 J3 CONNECTOR, 5-PIN DIN, RIGHT ANGLE PCB, 180 DEG CUI, SDS-50J

19 1 J4 CONN, JACK BANANA INSUL NYLON VIOLET EMERSON NETWORK, 108-0912-001

20 1 J5 CONN, JACK BANANA INSUL NYLON BLACK EMERSON NETWORK, 108-0903-001

21 1 J6 CONN, JACK BANANA INSUL NYLON YELLOW EMERSON NETWORK, 108-0907-001

22 1 J7 CONN, JACK BANANA INSUL NYLON RED EMERSON NETWORK, 108-0902-001

23 1 P1 HEADER, 5 PIN, 0.156, LOCKING MOLEX, 09-65-2058

24 1 Q1 TRANS, GP, 40V, 200mA, SOT-23 ON SEMI, MMBT3904LT1G

25 2 R1, R8 RES, METAL FILM, 7.87k, 1/4W, 0.1% RC55 IRC, RC55LF-D-7K87-B-B

26 1 R2 RES, METAL FILM, 249Ω, 1/8W, 0.1% 0805 VISHAY, TNPW0805249RBEEA

27 1 R3 RES, CHIP, 240Ω, 1W, 5% 2512 PANASONIC, ERJ-1TYJ241U

28 1 R4 TRIMPOT, SEALED, 500Ω, CERMET, SMT BOURNS, 3361P-1-501GLF rl

29 1 R5 RES, METAL FILM, 715Ω, 1/4W, 0.1% RC55 IRC, RC55LF-D-715R-B-B

30 1 R6 RES, METAL FILM, 19.1k, 1/4W, 0.1% RC55 IRC, RC55LF-D-19K1-B-B

31 1 R7 RES, METAL FILM, 40.2k, 1/4W, 0.1% RC55 IRC, RC55LF-D-40K2-B-B

32 1 R9 RES, METAL FILM, 9.09k, 1/4W, 0.1% RC55 IRC, RC55LF-D-9K09-B-B

33 1 R10 RES, METAL FILM, 12.1k, 1/4W, 0.1% RC55 IRC, RC55LF-D-12K1-B-B

34 1 R11 RES, METAL FILM, 130Ω, 1/8W, 0.1% 0805 VISHAY, TNPW0805130RBEEA

35 1 R12 RES, METAL FILM, 1M, 1/8W, 0.1% 0805 VISHAY, TNPW08051M00BEEA

36 4 R13, R15 TO

R17

RES, METAL FILM, 10k, 1/8W, 0.1% 0805 VISHAY, TNPW080510K0BEEA

37 1 R14 RES, METAL FILM, 4.99k, 1/8W, 0.1% 0805 VISHAY, TNPW08054K99BEEA

38 2 R18, R19 RES, METAL FILM, 12.1k, 1/8W, 0.1% 0805 VISHAY, TNPW080512K1BEEA

dc1858af

DEMO MANUAL DC1858A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

39 1 R20 RES, METAL FILM, 4.3k, 1/8W, 0.1% 0805 PANASONIC, ERA-6AEB432V

40 1 R21 RES, METAL FILM, 100k, 1/8W, 0.1% 0805 VISHAY, TNPW0805100KBEEA

41 1 R22 RES, METAL FILM, 28k, 1/8W, 0.1% 0805 VISHAY, TNPW080528K0BEEA

42 1 R23 RES, METAL FILM, 36k, 1/8W, 0.1% 0805 VISHAY, TNPW080536K0BEEA

43 1 R24 RES, METAL FILM, 100Ω, 1/8W, 0.1% 0805 VISHAY, TNPW0805100RBEEA

44 2 R25, R26 RES, METAL FILM, 470Ω, 1/8W, 0.1% 0805 VISHAY, TNPW0805470RBEEA

45 1 R27 RES, CHIP, 100Ω, 0.5W, 5% 2010 ROHM, MCR50JZHJ101/VISHAY,

CRCW2010100RJNEA

46 3 U1, U2, U3 IC, OP-AMP, 90MHz, SO-8 LINEAR TECHNOLOGY, LT1468CS8#PBF

47 1 U4 OPTOCOUPLER, ANALOG, AXIAL VACTEC, VTL5C10

48 3 U5, U6, U7 IC, OP-AMP, JFET, SO-8 LINEAR TECHNOLOGY, LT1122CS8#PBF

49 1 U8 IC, OP-AMP, PRECISION, SO-8 LINEAR TECHNOLOGY, LT1006CS8#PBF

50 1 U9 IC, MICROPOWER REFERENCE, 5V, SOIC LINEAR TECHNOLOGY, LT1634ACS8-5#PBF

51 5 TERMINAL, 18-24 AWG CRIMP FEMALE TIN, BAG MOLEX, 08-70-1030

52 1 BOX, ALUM. 4.72 x 4.06 x 2.09" BL/NAT HAMMOND, 1455N1201

53 2 SCREWS, THREAD-FORMING PHILLIPS PANHEAD,

M2 x 0.4mm x 6mm LENGTH

GRAINGER, ITEM #1PU17

54 1 ALIGNMENT TOOL PHILMORE, # 63-8608

55 1 AC ADAPTOR POWER SUPPLY W/ PSE MARKING AND 5 PIN

180 DEG DIN CONNECTOR OUTPUT

ETA-USA, DTA27-3X-W-5

parts List

dc1858af

DEMO MANUAL DC1858A

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

dc1858af

DEMO MANUAL DC1858A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0313 • 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

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 LT C 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. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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