Linear Technology DC814 Manuale utente

DC814 QUICK START QUIDE

DESCRIPTION

Demonstration circuit DC814 is for the evaluation of Linear Tech-

nology’s resistor set oscillator ICs in a SOT-2 package. The

DC814 is available in three sets of independent PCB assemblies:

A Buffer Board (DC814A-X) and

Tw o DIP-8 Clock Boards (DC814B-X) and (DC814C-X).

The buffer board contains a DIP-8 clock board mounted on a

DIP-8 socket and a multi-turn potentiometer for adjusting the

frequency of the DIP-8 clock. The output of the DIP-8 clock is

buffered by a high speed driver (the buffer’s maximum output

current is ±100mA). The output of the buffer is connected thru a

50 ohm resistor to a BNC connector for driving oscilloscope

probes and 50 ohm coaxial cables.

Table 1. Buffer Board Part Num bers

Buffer Board Clock IC

DC814A-A LTC6905

DC814A-B LTC1799

DC814A-C LTC6900

DC814A-D LTC6905-1

DC814A-E LTC6905-100

DC814A-F LTC6905-96

DC814A-G LTC6905-80

DC814A-H LTC6906

DC814A-I LTC6907

A buffer board can easily be set up for evaluation using one

pow er supply, an oscilloscope and a frequency counter (see fig-

ure 4). A DIP-8 clock board can be removed from the buffer

board and used independently as a clock source to a digital pro-

totype system. The DIP-8 clock board has surface mount pads

for installing an 060 size resistor (RS1 on clock board) w hen it

is used independently of the clock buffer board.

The DIP-8 clock boards for the LTC6905-XXX series do not re-

quire an R SET resistor and can be used as fixed frequency

clocks. The size of the DIP-8 clock board is equivalent to the

“half-size” canned crystal oscillators (1 mmx1 mm).

The DIP-8 clock boards can be ordered independently of a buffer

board and have the follow ing part numbers:

Table 2. DIP-8 Clock Board Part Numbers

DIP-8 Clock Board Clock IC

DC814B-A LTC6905

DC814B-B LTC1799

DC814B-C LTC6900

DC814B-D LTC6905-1

DC814B-E LTC6905-100

DC814B-F LTC6905-96

DC814B-G LTC6905-80

DC814C-H LTC6906

DC814C-I LTC6907

Design files for these circuit boards are available. Call

the TC factory.

, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT

and Pow erPath are trademarks of Linear Technology Corporation.

DEMO CIRCUIT DC814

QUICK START GUIDE

RESISTOR SET OSCILLATORS IN SOT-

23:

LTC6905, LTC1799, LTC6900, LTC6905-XXX,

LTC6906, LTC6907

DC814 QUICK START QUIDE

FIGURE 1. A BUFFER BOARD (DC814A-X)

FIGURE 2. A DC814B-X DIP-8 Clock Board

JP2 shunt to set oscillator divider input

DC814 QUICK START QUIDE

FIGURE 3. A DC814C-X DIP-8 Clock Board

JP2 shunt to set oscillator divider input.

(1-2 of JP2 is the top row pins)

FIGURE 4. Typical Buffer Board Quick Test Set-Up

DC814 QUICK START QUIDE

QUICK START PROCEDURE

Test Procedure: Buffer Board w ith DIP-8 Clock

Test E uipm ent:

A. a single pow er supply, V to 5V.

B. an oscilloscope w ith a bandw idth of at least

10x the highest clock IC frequency (for example, the highest fre-

quency of the LTC6905 is 170M Hz and the oscilloscope bandw idth

should be at least 1.7GHz).

C. a frequency counter

D. a potentiometer screw driver

E. a resistance meter

A. Test Procedure for the Resistor SET ICs:

IC Buffer Board

LTC6905 DC814A-A

LTC1799 DC814A-B

LTC6900 DC814A-C

LTC6906 DC814A-H

LTC6907 DC814A-I

1. Remove DIP-8 clock board from buffer board

2. Set the jumper shunt on the DIP-8 clock board to the divider

value, N, for the frequency range of interest (refer to Table ).

. Connect a resistance meter from the V+ turret to pin 1 of the

buffer board socket (see figure 4). Adjust the buffer board potenti-

ometer (R SET1) to set the total resistance (RSET1 plus RSET2) for

the desired frequency. Table show s the equation for R SET

(R SET1 plus R SET2). The resistor designator for the RSET resistor

on the DIP-8 clock board is RS1.

Note: The frequency adjustment is very coarse w hen the potenti-

ometer is turned near the fully clockw ise position.

4. Connect buffer board to a single pow er supply and an oscillo-

scope as show n in Figure 4 (the oscilloscope input should be set

to 50 ohms impedance internally or terminated externally w ith a

50 ohm BNC thru terminator).

5. Insert the DIP-8 clock board on the buffer board and turn on the

pow er supply.

6. The oscilloscope w aveform should be a 0V to V+/2 squarew ave

(the output of the clock is divided by tw o by 50 ohms in series

w ith the buffer output and the 50 ohm oscilloscope input).

7. Connect the buffer board CLKOUT to a frequency counter to

measure the frequency precisely (the maximum frequency error at

C is listed in Table ).

B. Test Procedure for the Fixed Frequency ICs:

IC Buffer Board

LTC6905-1 DC814A-D

LTC6905-100 DC814A-E

LTC6905-96 DC814A-F

LTC6905-80 DC814A-G

1. Connect buffer board w ith the DIP-8 clock to a single pow er

supply and an oscilloscope as show n in Figure 4 (the oscilloscope

input should be set to 50 ohms impedance internally or terminated

externally w ith a 50 ohm BN C thru terminator).

2. Turn on the pow er supply.

. The oscilloscope w aveform should be a 0V to V+/2 squarew ave

(the output amplitude of the clock is divided by tw o by 50 ohms in

series w ith the buffer output and the 50 ohm oscilloscope input).

4. Connect the buffer board CLKOUT to a frequency counter to

measure the frequency precisely (the maximum frequency error at

C is listed in Table ).

C. Test Procedure for the VCO function of TC6905 (DC814A-A),

TC1799 (DC814A-B) and TC16900 (D C814A-C).

1. Turn potentiometer RSET1 fully clockw ise and set the JP2

shunt on the DIP-8 clock board to 1-2.

2. Connect a voltage source to the buffer board’s VIN input

(refer to Figure 5) and turn on pow er.

. Typical VCO voltage (VCTRL) and Frequency range:

DC814 QUICK START QUIDE

NOTE:

The typical VCO control voltage range depends on the clock

IC, the ratio of the R SET and RIN resistors and the V+ voltage.

VCO operation is not guaranteed if the VCO voltage forces the

clock’s frequency outside the frequency range show n on Table .

Refer to the LTC6905 data sheet for a VCO design guide or to a

M ay 2002 Linear Technology M agazine article: How to use the

LTC6900 as a VCO.

V+= V V+=5V

LTC6905 0V - 1.6V 1.2V – .6V

100.5M Hz –168.5M Hz 70M Hz – 168.5M Hz

RSET = 9.09k and RIN = 40.2k

LTC1799 0V – V 0V – .7V

18.5M Hz – M Hz 9M Hz – M Hz

RSET = .01k and RIN = 14.7k

LTC6900 0V – 1.7V 0V – .7V

12M Hz – 20M Hz 5M Hz – 20M Hz

RSET = 9.09k and RIN = 40.2k

TABLE 3. Fre uency Range and Accuracy of Clock ICs

RSET= (RSET1+ RSET2) on the Buffer Board and

RSET= RS1 on the DIP-8 Clock Board.

LTC6905

(Board Version –A)

RSET = 3370/(2·Fosc·N-3),

(

Fosc in M Hz and R SET in kΩ )

N = 1, 69M Hz≤ fosc≤170M Hz (JP2 1-2)

N = 2, 4M Hz≤fosc≤85M Hz (JP2 -4)

N = 4, 17M Hz≤fosc≤42M Hz (JP2 5-6)

M aximum Frequency Error at 25

°C

±1.4% at V+=2.7V to .6V and ±2.2% at V+=5V

LTC1799

(Board Version –B)

RSET = 100/(Fosc·N)

, (

Fosc in M Hz and R SET in kΩ )

N = 1, 0.1M Hzfosc≤ M Hz (JP2 5-6)

N=10, 10kH ≤fos≤ . M Hz (JP2 -4)

N = 100, 1kHz≤ fosc≤ 0kHz (JP2 1-2)

M aximum Frequency Error at 25

°C

±1.5% at V+= V and ±1.5% at V+=5V

LTC6900

(Board Version –C)

RSET = 200/(Fosc·N),

(

Fosc in M Hz and RSET in kΩ )

N = 1, 0.1M Hz≤fosc≤20M Hz (JP2 5-6)

N = 10, 10kHz≤fosc≤2M Hz (JP2 -4)

N = 100, 1kHz≤fosc≤200kHz (JP2 1-2)

M aximum Frequency Error at 25

°C

±1.5% at V+= V and ±1.5% at V+=5V

LTC6905-133

(Board Version –D)

N = 1, 1 M Hz; N = 2, 66.7M Hz; N = 4, .5M Hz

M aximum Frequency Error at 25 °C: ±1.0% at V+=2.7V to .6V

and ±1.5% typical at V+=5V

LTC6905-100

(Board Version –E)

N = 1, 100M Hz; N = 2, 50M Hz; N = 4, 25M Hz

M aximum Frequency Error at 25 °C: ±1.0% at V+=2.7V to .6V

and ±1.5% typical at V+=5V

LTC6905-96

(Board Version –F)

N = 1, 96M Hz; N = 2, 48M Hz; N = 4, 24M Hz

M aximum Frequency Error at 25 °C: ±1.0% at V+=2.7V to .6V

and ±1.5% typical at V+=5V

LTC6905-80

(Board Version –G)

N = 1, 80M Hz, N = 2, 40M Hz; N = 4, 20M Hz

M aximum Frequency Error at 25 °C: ±1.0% at V+=2.7V to .6V

and ±1.5% typical at V+=5V

LTC6906

(Board Version –H)

RSET = 100/(Fosc·N),

(

Fosc in M Hz and RSET in kΩ )

N = 1, 0.1M Hz≤fosc≤ 1M Hz (JP2 5-6)

N = , kHz≤fosc≤ kHz (JP2 -4)

N = 10, 10kHz≤fosc ≤100kHz (JP2 1-2)

M aximum Frequency Error at 25

°C

: ±0.5% at V+=2.7V to .6V

LTC6907

(Board Version –

)

RSET = 200/(Fosc·N),

(

Fosc in M Hz and RSET in kΩ )

N = 1, 0.4M Hz≤fosc≤4M H (JP2 5-6)

N = , 1 M Hz≤fosc≤1. M Hz (JP2 -4)

FIGURE 5. VCO Circuit of Buffer Board

DC814 QUICK START QUIDE

N = 10, 40 kHz≤fosc≤400kHz (JP2 1-2)

M aximum Frequency Error at 25

°C

: ±0.5% at V+=2.7V to .6V

DC814 QUICK START QUIDE

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