LTC6900 データシートの表示（PDF） - Linear Technology

部品番号

コンポーネント説明

メーカー

LTC6900

Low Power, 1kHz to 20MHz Resistor Set SOT-23 Oscillator

Linear Technology 

LTC6900

APPLICATIONS INFORMATION

Example 3:

V+ = 3V, fOSC(MAX) = 5MHz, fOSC(MIN) = 4MHz, N = 1

VIN(MAX) = 2.5V, VIN(MIN) = 0.5V

RIN/RSET = 8.5, RSET = 43.2k, RIN = 365k

Maximum modulation bandwidth is the lesser of 25kHz

or fOSC(MIN)/20 (4MHz/20 = 200kHz)

Maximum VIN modulation frequency = 25kHz

Example 4:

V+ = 3V, fOSC(MAX) = 400kHz, fOSC(MIN) = 200kHz, N = 10

VIN(MAX) = 2.5V, VIN(MIN) = 0.5V

RIN/RSET = 3.1, RSET = 59k, RIN = 182k

Maximum modulation bandwidth is the lesser of 25kHz or

fOSC(MIN)/20 calculated at N =1 (2MHz/20 = 100kHz)

Maximum VIN modulation frequency = 25kHz

Table 2. Variation of VRES for Various Values of RIN || RSET

RIN || RSET (VIN = V+)

VRES, V + = 3V

VRES, V+ = 5V

20k

0.98V

1.03V

40k

1.03V

1.08V

80k

1.07V

1.12V

160k

1.1V

1.15V

320k

1.12V

1.17V

VRES = Voltage across RSET

Note: All of the calculations above assume VRES = 1.1V, although VRES

≈ 1.1V. For completeness, Table 2 shows the variation of VRES against

various parallel combinations of RIN and RSET (VIN = V+). Calulate first

with VRES ≈ 1.1V, then use Table 2 to get a better approximation of VRES,

then recalculate the resistor values using the new value for VRES.

PACKAGE DESCRIPTION

0.62

0.95

MAX

REF

S5 Package

5-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1635)

1.22 REF

2.90 BSC

(NOTE 4)

3.85 MAX 2.62 REF

1.4 MIN

2.80 BSC

1.50 – 1.75

(NOTE 4)

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

0.20 BSC

DATUM ‘A’

PIN ONE

0.95 BSC

0.80 – 0.90

1.00 MAX

0.30 – 0.45 TYP

5 PLCS (NOTE 3)

0.01 – 0.10

0.30 – 0.50 REF

0.09 – 0.20

NOTE:

(NOTE 3)

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

1.90 BSC

S5 TSOT-23 0302 REV B

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.

6900fa

11

Share Link: