LTC6900 Linear Technology, LTC6900 Datasheet - Page 11

• Manufacturer Part Number: LTC6900
• Description: 1kHz to 20MHz Resistor Set SOT-23 Oscillator
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
Example 3:
V
V
R
Maximum modulation bandwidth is the lesser of 25kHz or
f
Maximum V
Example 4:
V
V
R
PACKAGE DESCRIPTIO
OSC(MIN)
+
IN(MAX)
+
IN(MAX)
IN/
IN/
= 3V, f
= 3V, f
R
R
SET
SET
= 2.5V, V
/20 (4MHz/20 = 200kHz)
= 2.5V, V
= 8.5, R
= 3.1, R
OSC(MAX)
OSC(MAX)
IN
0.20 BSC
NOTE:
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
modulation frequency = 25kHz
SET
SET
3.85 MAX
DATUM ‘A’
IN(MIN)
IN(MIN)
= 5MHz, f
= 400kHz, f
U
= 43.2k, R
= 59k, R
2.62 REF
= 0.5V
= 0.5V
U
RECOMMENDED SOLDER PAD LAYOUT
OSC(MIN)
IN
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
MAX
0.62
OSC(MIN)
0.30 – 0.50 REF
PER IPC CALCULATOR
IN
= 182k
= 365k
W
U
= 4MHz, N = 1
0.95
REF
= 200kHz, N = 10
(Reference LTC DWG # 05-08-1635)
1.22 REF
1.4 MIN
U
0.09 – 0.20
(NOTE 3)
5-Lead Plastic TSOT-23
2.80 BSC
S5 Package
1.00 MAX
1.50 – 1.75
Maximum modulation bandwidth is the lesser of 25kHz or
f
Maximum V
Table 2. Variation of V
R
20k
40k
80k
160k
320k
V
Note: All of the calculations above assume V
Table 2 shows the variation of VRES against various parallel combinations of R
(V
then recalculate the resistor values using the new value for V
(NOTE 4)
OSC(MIN)
IN
RES
IN
0.80 – 0.90
PIN ONE
= V
|| R
= Voltage across R
+
0.95 BSC
). Calulate first with V
SET
(V
/20 calculated at N =1 (2MHz/20 = 100kHz)
IN
IN
= V
modulation frequency = 25kHz
+
)
2.90 BSC
(NOTE 4)
RES
1.90 BSC
SET
RES
1.1V, then use Table 2 to get a better approximation of V
V
for Various Values of R
RES
0.98V
1.03V
1.07V
1.12V
, V
1.1V
RES
+
= 1.1V, although V
= 3V
S5 TSOT-23 0302
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
RES
.
RES
LTC6900
V
RES
1.1V. For completeness,
IN
1.03V
1.08V
1.12V
1.15V
1.17V
, V
|| R
+
SET
= 5V
11
IN
and R
6900f
RES
SET
,