Linear Technology DC1783A-A Quick setup guide

dc1783afb

DEMO MANUAL DC1783A

DESCRIPTION

LTC2380/LTC2379/LTC2378/

LTC2377/LTC2376: 18-Bit/16-Bit, 2Msps/1.6Msps/1Msps/

500ksps/250ksps Low Power, Low Noise ADCs

The LTC2380/LTC2379/LTC2378/LTC2377/LTC2376 are

low power, low noise ADCs with serial outputs that can

operate from a single 2.5V supply. The following text refers

to the LTC2379-18 but applies to all parts in the family,

the only difference being the maximum sample rates and

the number of bits. The LTC2379-18 supports a ±5V fully

differential input range with a 101dB SNR, consumes

only 18mW and achieves ±2LSB INL max with no miss-

ing codes at 18-bits. The DC1783A demonstrates the DC

and AC performance of the LTC2379-18 in conjunction

with the DC590 QuikEval™ and DC718 PScope™ data

collection boards. Use the DC590 to demonstrate DC L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks

and QuikEval and PScope are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

performance such as peak-to-peak noise and DC linearity.

Use the DC718 if precise sampling rates are required or to

demonstrate AC performance such as SNR, THD, SINAD

and SFDR. The demonstration circuit 1783A is intended

to demonstrate recommended grounding, component

placement and selection, routing and bypassing for this

ADC. Several suggested driver circuits for the analog

inputs will be presented.

Design files for this circuit board are available at

http://www.linear.com/demo

Figure 1. DC1783A Connection Diagram

–9V

+9V

GND

CLK IN

100MHz MAX

3.3VP-P MAX

AIN+

0V TO VREF MAX

AIN–

0V TO VREF MAX

TO DC590

TO DC718

DC1783A F01

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dc1783afb

DEMO MANUAL DC1783A

QUICK START PROCEDURE

DESCRIPTION

DC718

Check to make sure that all switches and jumpers are

set as shown in the connection diagram of Figure 1. The

default connections configure the ADC to use the onboard

reference and regulators to generate the required common

mode voltages. The analog input is DC-coupled. Connect

the DC1783A to a DC718 USB High Speed Data Collection

Board using connector J2. Then, connect the DC718 to a

host PC with a standard USB A/B cable. Apply ±9V to the

indicated terminals. Then apply a low jitter signal source

to J4. The default setup uses a single-ended to differential

converter so thatit is onlynecessary to apply a single-ended

input signal to J4. Connect a low jitter 100MHz 3.3VP-P

sine wave or square wave to connector J1. Note that J1

has a 50Ω termination resistor to ground.

Run the PScope software (PScope.exe version K72 or

later) supplied with the DC718 or download it from www.

linear.com.

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 DC1783A and

configure itself automatically.

Click the COLLECT button (See Figure 6) to begin acquiring

data. The Collect button then changes to Pause, which can

be clicked to stop data acquisition.

Table 1. DC1783A Assembly Options

ASSEMBLY VERSION U1 PART NUMBER MAX CONVERSION RATE NUMBER OF BITS MAX CLK IN FREQUENCY

DC1783A-A LTC2380CMS-16 2Msps 16 100MHz

DC1783A-B LTC2378CMS-16 1Msps 16 50MHz

DC1783A-C LTC2377CMS-16 500ksps 16 25MHz

DC1783A-D LTC2376CMS-16 250ksps 16 12.5MHz

DC1783A-E LTC2379CMS-18 1.6Msps 18 99.2MHz

DC1783A-F LTC2378CMS-18 1Msps 18 62MHz

DC1783A-G LTC2377CMS-18 500ksps 18 31MHz

DC1783A-H LTC2376CMS-18 250ksps 18 15.5MHz

DC590 SETUP

IMPORTANT! To avoid damage to the DC1783A, make

sure that VCCIO (JP6) is set to 3.3V before connecting the

DC590 to the DC1783A.

To use the DC590 with the DC1783A, it is necessary to

apply –9V and ground to the –9V and GND terminals or

disable amplifier U15 by moving R32 and R36 to R31 and

R38 respectively. If U15 is disabled, it is required that J4

and J8 are both driven. If U15 is not disabled then it is

only necessary to drive J4. Connect the DC590 to a host

PC with a standard USB A/B cable. Connect the DC1783A

to a DC590 USB serial controller using the supplied

14-conductor ribbon cable. Apply a signal source to J4 or

J4 and J8 depending on how the DC1783A is configured.

Run the evaluation software supplied with the DC590 or

download it from www.linear.com. The correct control

panel will be loaded automatically. Click the COLLECT

button (Figure 7) to begin reading the ADC.

DC1783A SETUP

DC Power

The DC1783A requires ±9VDC and draws 100mA. Most

of the supply current is consumed by the CPLD, opamps,

regulators and discrete logic on the board. The 9VDC

input voltage powers the ADC through LT1763 regulators

which provide protection against accidental reverse bias.

Additional regulators provide power for the CPLD and

opamps. See Figure 1 for connection details.

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DEMO MANUAL DC1783A

QUICK START PROCEDURE

Clock Source

You must provide a low jitter 3.3VP-P sine or square wave

to J1. The clock input is AC-coupled so the DC level of the

clock signal is not important. A generator like the HP8644

or the DC1216A-A is recommended.Even a good generator

can start to produce noticeable jitter at low frequencies.

Therefore it is recommended for lower sample rates to

divide down a higher frequency clock to the desired sample

rate. The ratio of clock frequency to conversion rate is

62:1 for 18-bit parts and 50:1 for 16-bit parts. If the clock

input is to be driven with logic, it is recommended that the

50Ω terminator (R5) be removed. Slow rising edges may

compromise the SNR of the converter in the presence of

high-amplitude higher frequency input signals.

Data Output

Parallel data output from this board (0V to 3.3V default),

if not connected to the DC718, can be acquired by a logic

analyzer, and subsequently imported into a spreadsheet, or

mathematical package depending on what form of digital

signal processing is desired. Alternatively, the data can be

fed directly into an application circuit. Use pin 3 of J2 to

latch the data. The data can be latched using either edge

of this signal. The data output signal levels at J2 can also

be reduced to 0V to 2.5V if the application circuit cannot

tolerate the higher voltage. This is accomplished by mov-

ing JP3 to the 2.5V position.

Reference

The default reference is a LTC6655 5V reference. Alterna-

tively, if a lower power reference is desired, this reference

(U20) can be removed and a LTC6652 5V reference can

be installed in the U10 position. This will result in only

a small loss in performance in applications where the

ADC is continuously converting. If an external reference

is used it must settle quickly in the presence of glitches

on the REF pin.

Analog Input

The default driver for the analog inputs of the LTC2379-18

on the DC1783A is shown in Figure 2. This circuit converts

a single-ended 0V to 5V input signal applied at AIN+into

a differential signal with a swing of ±5V between the +IN

and –IN inputs of the ADC. In addition, this circuit band

limits the input frequencies to approximately 800kHz.

Figure 2. Single-Ended to Differential Converter

R32

20Ω

AIN

0V TO VREF

VREF/2

R36

20Ω

R16

0Ω

R19

0Ω

C19

0.003µF

NPO

C39

0.003µF

NPO

C40

0.003µF

NPO

C45

10µF

DC1783A F02

LTC2379-18LT6350

–

Alternatively, if your application circuit produces a differ-

ential signal which can drive the ADC but you need to level

shift the input signal, the circuit shown in Figure 3 can be

used. The circuit in Figure 3 AC-couples the input signal

and is usable down to about 10kHz. The lower frequency

limit can be extended by increasing C17 and C48.

AC-coupling the input may degrade the distortion per-

formance of the ADC due to nonlinearity of the coupling

capacitor (C17). The circuit in Figure 3 can be implemented

on the DC1783A by putting JP1 and JP5 in the AC posi-

tion, moving R32 and R36 to the R31 and R38 positions

and adding a 1k resistor at the R9 location. At this point

it will be necessary to drive both AIN+and AIN–. One of

these RC pairs can be attached to the input of the circuit

in Figure 2. This allows a single-ended input signal to be

level shifted.

One of the most asked for ADC driver circuits is one that

allows the input voltage to swing below ground while using

a single supply ADC. The input driver shown in Figure4

accepts a true bipolar input voltage range of ±10V and

converts it to the 0V to 5V input swing of the ADC. The

circuit of Figure 4 can be implemented on the DC1783A

by replacing R9 with 499Ω, R15 with 2k, R35 with 2k and

R45 with 499Ω.

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dc1783afb

DEMO MANUAL DC1783A

Data Collection

For SINAD, THD or SNR testing a low noise, low distortion

generator such as the B&KType 1051 or Stanford Research

DS360 should be used. A low jitter RF oscillator such as

the HP8644 or DC1216A-A is used as the clock source.

This demo board is tested in house by attempting to

duplicate the FFT plot shown on the front page of the

LTC2379-18 data sheet.This involvesusing a100MHz clock

source, along with a sinusoidal generator at a frequency of

2kHz. The input signal level is approximately –1dBFS. The

input is level shifted and filtered with the circuit shown in

Figure5. A typical FFT obtained with DC1783A is shown

in Figure6. Note that to calculate the real SNR, the signal

level (F1 amplitude = –1.080dB) has to be added back to

the SNR that PScope displays. With the example shown in

Figure 6 this means that the actual SNR would be 101.07dB

instead of the 99.99dB that PScope displays. Taking the

RMS sum of the recalculated SNR and the THD yields

a SINAD of 100.7dB which is fairly close to the typical

number for this ADC.

There are a number of scenarios that can produce mis-

leading results when evaluating an ADC. One that is

common is feeding the converter with a frequency, that

is a sub-multiple of the sample rate, and which will only

exercise a small subset of the possible output codes. The

proper method is to pick an M/N frequency for the input

sine wave frequency. N is the number of samples in the

FFT. M is a prime number between one and N/2. Multiply

M/N by the sample rate to obtain the input sine wave

frequency. Another scenario that can yield poor results

is if you do not have a signal generator capable of ppm

frequency accuracy or if it cannot be locked to the clock

frequency. You can use an FFT with windowing to reduce

the leakage or spreading of the fundamental, to get a close

approximation of the ADC performance. If an amplifier or

clock source with poor phase noise is used, the windowing

will not improve the SNR.

Figure 3. AC-Coupled Differential Driver

Figure 5. Level Shift and Filter Circuit Used for Board Testing

Figure 4. ±10V Single-Ended to 0V to 5V Differential

DC-Coupled Driver

R31

20Ω

R40

AIN+

0V TO VREF

AIN–

0V TO VREF R38

20Ω

R16

0Ω

R19

0Ω

C19

0.003µF

NPO

C39

0.003µF

NPO

C40

0.003µF

NPO

C17

10µF

VCM

C48

10µF

DC1783A F03

+IN

–IN

QUICK START PROCEDURE

DC1783A F04

LT6350

R45

499Ω

R15

VCM = VREF/2

0V TO 5V

TO IN+

R35

5V TO 0V

TO IN–

–

10V TO –10V

AIN

SINE IN

–VREF TO +VREF

0.15µF

REF

DC1783A F05

AIN+

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dc1783afb

DEMO MANUAL DC1783A

QUICK START PROCEDURE

Layout

As with any high performance ADC, this part is sensitive

to layout. The area immediately surrounding the ADC on

the DC1783A should be used as a guideline for place-

ment, and routing of the various components associated

with the ADC. Here are some things to remember when

laying out a board for the LTC2379-18. A ground plane is

necessary to obtain maximum performance. Keep bypass

capacitors as close to supply pins as possible. Use indi-

vidual low impedance returns for all bypass capacitors.

Use of a symmetrical layout around the analog inputs will

minimize the effects of parasitic elements. Shield analog

input traces with ground to minimize coupling from other

traces. Keep traces as short as possible.

Component Selection

When driving a low noise, low distortion ADC such as

the LTC2379-18, component selection is important so

as to not degrade performance. Resistors should have

low values to minimize noise and distortion. Metal film

resistors are recommended to reduce distortion caused

by self heating. Because of their low voltage coefficients,

to further reduce distortion NPO or silver mica capacitors

should be used. Any buffer used to drive the LTC2379-18

should have low distortion, low noise and a fast settling

time such as the LT6350.

DC1783A JUMPERS

Definitions

JP1: Selects AC- or DC-coupling of AIN+. The default set-

ting is DC.

JP2: VCM sets the DC bias for AIN+and AIN–when the

inputs are AC-coupled. VREF/2 is the default setting.

JP3: VCCIO sets the output levels at J2 to either 3.3V or

2.5V. Use 3.3V to interface to the DC718 which is the

default setting.

JP5: Selects AC- or DC-coupling of AIN–. The default set-

ting is DC.

JP6: FS selects whether the digital gain compression is

on or off. In the VREF position digital gain compression

is off and the analog input range at AIN+is 0V to VREF. In

the 0.8VREF position digital gain compression is turned on

and the analog input range at AIN+is 0.1VREF to 0.9VREF.

JP7: Selects –3.6V or ground for V–. The default is –3.6V.

Setting JP7 to ground is useful for evaluating single sup-

ply operation of the buffer when operating the ADC with

digital gain compression turned on.

JP8: Selects 8V or 5V for V+. The default is 8V. Setting JP8

to 5V is useful for evaluating single 5V supply operation

of the buffer when operating the ADC with digital gain

compression turned on.

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dc1783afb

DEMO MANUAL DC1783A

QUICK START PROCEDURE

Figure 6. Pscope Screen Shot

Figure 7. QuikEval Screen Shot

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dc1783afb

DEMO MANUAL DC1783A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 17 C1-C5, C7, C10, C11, C13-C16, C41, C43,

C56, C57, C60

Capacitor, X5R, 0.1µF, 16V, 10%, 0603 AVX, 0603YD104KAT

2 12 C6, C9, C17, C24, C26, C29, C45, C48, C52,

C53, C61, C63

Capacitor, X5R, 10µF, 6.3V, 20%, 0603 TDK, C1608X5R0J106MT

3 13 C8, C12, C22, C25, C28, C44, C46, C51, C54,

C55, C59, C62, C64

Capacitor, X7R, 1µF, 16V, 10%, 0603 TDK, C1608X7R1C105K

4 0 C18, C47, C49, C58 Capacitor, 0603 OPT

5 1 C19 Capacitor, C0G, 3300pF, 50V, 10%, 1206 AVX, 12065A332KAT2A

6 1 C20 Capacitor, X5R, 47µF, 6.3V, 20%, 0805 Taiyo Yuden, JMK212BJ476MG-T

7 1 C21 Capacitor, X5R, 22µF, 16V, 20%, 1210 Taiyo Yuden, EMK325BJ226MM-T

8 4 C23, C27, C30, C50 Capacitor, X7R, 0.01µF, 16V, 10%, 0603 AVX, 0603YC103KAT

9 2 C39, C40 Capacitor, COG, 3300pf, 50V, 10%, 0603 Kemet, C0603C332K5GACTU

10 8 C31-C38 Capacitor, X7R, 0.1µF, 16V, 10%, 0402 TDK, C1005X7R1C104KT

11 1 C42 Capacitor, C0G, 15pF, 50V, 10%, 0603 AVX, 06035A150KAT2A

12 5 E1, E4, E6, E7, E10 TP, Turret, 0.094" Mill-Max, 2501-2-00-80-00-00-07-0

13 5 E2, E3, E5, E8, E9 TP, Turret, 0.064" Mill-Max, 2308-2-00-80-00-00-07-0

14 3 J1, J4, J8 Connector, BNC-5 Pins Connex, 112404

15 1 J2 Connector, 40 Pins SMT, CON-EDGE40-100 Samtec, TSW-120-07-L-D

16 1 J3 Header, 2mm ×7mm, 0.079" Molex, 87831-1420

17 1 J5 Header, 2mm ×5mm, 0.100", HD2X5-100 Samtec, TSW-105-07-L-D

18 7 JP1-JP3, JP5-JP8 Jumper, 1mm ×3mm, 0.100", HD1X3-100 Samtec, TSW-103-07-L-S

19 4 R1, R3, R4, R8 Resistor, Chip, 33Ω, 1%, 0603 NIC, NRC06F33R0TRF

20 10 R2, R6, R7, R13, R24, R29, R40, R43, R48,

R49

Resistor, Chip, 1k, 1%, 0603 NIC, NRC06F1001TRF

21 1 R5 Resistor, Chip, 49.9Ω, 1%, 1206 NIC, NRC12F49R9TRF

22 3 R10, R11, R12 Resistor, Chip, 4.99k, 1%, 0603 NIC, NRC06F4991TRF

23 6 R14, R33, R34, R39, R45, R46 Resistor, Chip, 0Ω, 1%, 0603 NIC, NRC06F0000TRF

24 1 R18 Resistor, Chip, 1k, 1%, 0603 NIC, NRC06F1001TRF

25 2 R16, R19 Resistor, Chip, 0Ω, 1%, 0402 NIC, NRC04F0000TRF

26 2 R17, R28 Resistor, Chip, 2k, 1%, 0603 NIC, NRC06F2001TRF

27 3 R20, R22, R23 Resistor, Chip, 1k, 1%, 0402 NIC, NRC04F1001TRF

28 1 R21 Resistor, Chip, 10k, 1%, 0603 NIC, NRC06F1002TRF

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dc1783afb

DEMO MANUAL DC1783A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

29 1 R25 Resistor, Chip, 1.69k, 1%, 0603 NIC, NRC06F1691TRF

30 1 R26 Resistor, Chip, 1.54k, 1%, 0603 NIC, NRC06F1541TRF

31 1 R27 Resistor, Chip, 2.80k, 1%, 0603 NIC, NRC06F2801TRF

32 1 R30 Resistor, Chip, 10k, 1%, 0402 NIC, NRC04F1002TRF

33 0 R9, R15, R31, R35, R37, R38, R41 Resistor, 0603 OPT

34 2 R32, R36 Resistor, Chip, 20Ω, 1%, 0603 NIC, NRC06F20R0TRF

35 1 R42 Resistor, Chip, 5.62k, 1%, 0603 NIC, NRC06F5621TRF

36 1 R47 Resistor, Chip, 1.05k, 1%, 0603 NIC, NRC06F1051TRF

37 1 R50 Resistor, Chip, 249Ω, 1%, 0603 NIC, NRC06F2490TRF

38 1 R54 Resistor, Chip, 6.49k, 1%, 0603 NIC, NRC06F6491TRF

39 2 U2, U4 IC, Tinylogic ULP-A Unbuffered Inverter, SC70-5 Fairchild, NC7SVU04P5X

40 1 U3 IC, Single D Flip Flop, US8 ON Semi., NL17SZ74

41 3 U5, U13, U16 IC, LT1763CS8, SO8 Linear Technology, LT1763CS8

42 1 U6 IC, Single SPST Bus Switch, SC70-5 Fairchild, NC7SZ66P5X

43 1 U7 IC, Serial EEPROM, TSSOP Microchip, 24LC025-I/ST

44 2 U8, U9 IC, Tinylogic UHS Inverter, SC70-5 Fairchild, NC7SZ04P5X

45 0 U10 IC, LTC6652AHMS8-5, MS8 OPT

46 1 U11 IC, Max II Family, TQFP100 Altera, EPM240GT100C5N

47 1 U12 IC, LT1763CS8-1.8, SO8 Linear Technology, LT1763CS8-1.8

48 1 U14 IC, LT1763CS8-2.5, SO8 Linear Technology, LT1763CS8-2.5

49 1 U15 IC, LT6350CMS8, MS8 Linear Technology, LT6350CMS8

50 1 U17 IC, LT1964ES5-SD, SOT23-5 Linear Technology, LT1964ES5-SD

51 1 U20 IC, LTC6655HMS8-5, MS8 Linear Technology, LTC6655HMS8-5

52 4 MTG1, MTG2, MTG3, MTG4 Stand-Off, Nylon (Snap On), 0.25" Tall Keystone, 8831 (Snap On)

53 7 Shunts as Shown on Assy Dwg (JP1-JP3,

JP5-JP8)

Shunt, 0.100" Center Samtec, SNT-100-BK-G

54 1 Stencil for Top Side DC1783A

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dc1783afb

DEMO MANUAL DC1783A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

LTC2380CMS-16 – DC1783A-A

1 1 DC1783A General BOM

2 1 U1 IC, LTC2380CMS-16, MS16 Linear Technology, LTC2380CMS-16

LTC2378CMS-16 – DC1783A-B

1 1 DC1783A General BOM

2 1 U1 IC, LTC2378CMS-16, MS16 Linear Technology, LTC2378CMS-16

LTC2377CMS-16 – DC1783A-C

1 1 DC1783A General BOM

2 1 U1 IC, LTC2377CMS-16, MS16 Linear Technology, LTC2377CMS-16

LTC2376CMS-16 – DC1783A-D

1 1 DC1783A General BOM

2 1 U1 IC, LTC2376CMS-16, MS16 Linear Technology, LTC2376CMS-16

LTC2379CMS-18 – DC1783A-E

1 1 DC1783A General BOM

2 1 U1 IC, LTC2379CMS-18, MS16 Linear Technology, LTC2379CMS-18

3 1 R44 Resistor, Chip, 300Ω, 1%, 0402 NIC, NRC06F3000TRF

LTC2378CMS-18 – DC1783A-F

1 1 DC1783A General BOM

2 1 U1 IC, LTC2378CMS-18, MS16 Linear Technology, LTC2378CMS-18

3 1 R44 Resistor, Chip, 300Ω, 1%, 0402 NIC, NRC06F3000TRF

LTC2377CMS-18 – DC1783A-G

1 1 DC1783A General BOM

2 1 U1 IC, LTC2377CMS-18, MS16 Linear Technology, LTC2377CMS-18

3 1 R44 Resistor, Chip, 300Ω, 1%, 0402 NIC, NRC06F3000TRF

LTC2376CMS-18 – DC1783A-H

1 1 DC1783A General BOM

2 1 U1 IC, LTC2376CMS-18, MS16 Linear Technology, LTC2376CMS-18

3 1 R44 Resistor, Chip, 300Ω, 1%, 0402 NIC, NRC06F3000TRF

dc1783afb

DEMO MANUAL DC1783A

SCHEMATIC DIAGRAM

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