LTC2420CS8 datasheet(34/36 Pages) LINER

Part #	LTC2420CS8

Description	20-Bit mPower No Latency DSTM ADC in SO-8

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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34 / 36 page

LTC2420

TYPICAL APPLICATIO S

U1-A

U1-B

U1-C

U1-F

U1-E

TO LTC2420

FO PIN

U1-D

5pF

2N3904

10k

47k

10pF

100smps, FO = 2.048MHz

30smps, FO = 614.4kHz

U1: 74HC14 OR EQUIVALENT

270pF

HALT

2420 F40

Figure 40. 2.048MHz Oscillator for 100sps Output Rate

2.048MHz Oscillator for 100sps Output Ratio

The oscillator circuit shown in Figure 40 can be used to

drive the FO pin, boosting the conversion rate of the

LTC2420 for applications that do not require a notch at

50Hz or 60Hz. This oscillator is not sensitive to hysteresis

voltage of a Schmitt trigger device as are simpler

relaxation oscillators using the 74HC14 or similar de-

vices. The circuit can be tuned over a 3:1 range with only

one resistor and can be gated. The use of transmission

gates could be used to shift the frequency in order to

provide setable conversion rates.

LTC2420CS8 Datasheet(PDF) 34 Page - Linear Technology