LTC6906 Linear Technology, LTC6906 Datasheet
LTC6906
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LTC6906 Summary of contents
Page 1
... The LTC is versatile, compact and easy-to-use. Micropower opera- tion benefits portable and battery-powered equipment. At 100kHz, the LTC6906 consumes 12µ 3.3V supply. A single resistor programs the oscillator frequency over a 10:1 range with better than 0.5% initial accuracy. The output frequency can be divided span a 100:1 total frequency range, 10kHz to 1MHz ...
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... V 100kHz ≤ f ≤ 1MHz, LTC6906C 100kHz ≤ f ≤ 1MHz, LTC6906I f = 1MHz, LTC6906H f = 100kHz, LTC6906H 100kHz ≤ f ≤ 1MHz + V = 2.25V 100kHz ≤ f ≤ 1MHz, LTC6906C 100kHz ≤ f ≤ 1MHz, LTC6906I f = 1MHz, LTC6906H f = 100kHz, LTC6906H R = 316k SET + = 2.25V to 3.6V, 100k ≤ R ≤ 1000k ...
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... Note 6: Output rise and fall times are measured between the 10% and 90% power supply levels. Note 7: The LTC6906C is guaranteed to meet specified performance from 0°C to 70°C. The LTC6906C is designed, characterized and expected to meet specified performance from –40°C to 85°C but is not tested or QA sampled at these temperatures ...
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... LTC6906 www.DataSheet4U.com W TYPICAL PERFOR A CE CHARACTERISTICS Typical Frequency Error vs Power Supply 0.50 0.40 0.30 0.20 0. SET 100k SET –0.10 –0.20 –0.30 –0.40 –0. SUPPLY VOLTAGE (V) Typical Supply Current vs Frequency 5pF 25° 3. 2.25V 200 400 ...
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... N in the frequency equation. Tie to GND for ÷1, leave floating for ÷3 and tie to V floating, the LTC6906 pulls Pin 3 to mid-supply with a 2.5M resistor. When Pin 3 is floating, care should be taken to reduce coupling from the OUT pin and its trace to Pin 3. ...
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... GND 2 6906 F02 + Figure 2. V Pin + V 6 DIV 3 GND 2 Figure 5. DIV Pin 6 EQUIVALENT CIRCUIT OF OSCILLOSCOPE OR FREQUENCY COUNTER PROBE C LTC6906 TEST SUPPLY + V OUT VOLTAGE GND GRD DIV SET R SET 0.01% 10ppm/°C 6906 F01 C = 1/(1/5pF – 1/C ) TEST PROBE = 7.5pF FOR A 15pF SCOPE PROBE Figure 1 ...
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... SET t • C OSC OSC ƒ I OSC SET This is the fundamental equation for the LTC6906. It holds regardless of how the SET pin is driven. When a resistor connected from the SET pin to ground, we have SET the relationship: V SET = R SET I SET Table 1. Output Frequency Equations ...
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... APPLICATIO S I FOR ATIO Selecting R and the Divider Ratio SET The LTC6906 contains a master oscillator followed by a digital divider (see Block Diagram). R master oscillator frequency and the DIV pin sets the divider ratio, N. The range of frequencies accessible in each divider ratio overlap, as shown in Figure 7. This figure is derived from the equations in Table 1 ...
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... The GUARD RING output waveform is still well formed even in this case. The ability of the LTC6906 to operate with a resistive supply NO LEAKAGE permits supplying power via a CMOS logic gate or CURRENT microcontroller pin. Since the LTC6906 has a turn-on time of less than 200µ ...
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... Figure 13. Output Waveforms with an Inductive Supply (See Figure 12) Start-Up Time When the LTC6906 is powered up, it holds the OUT pin low. After the master oscillator has settled, the OUT pin is enabled and the first output cycle is guaranteed to be within specification. The time from power-up to the first output transition is given approximately by: ≅ ...
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... V 1µF GND DIV Figure 16. Using the LTC6906 at Higher Supply Voltages Alternative Methods for Setting the Output Frequency Any means of sinking current from the SET pin will control the output frequency of the LTC6906. Equation 2 (re- peated below) gives the fundamental relationship between ...
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... BSC 0.80 – 0.90 1.00 MAX 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 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 www.linear.com ● Sine Wave Oscillator 0.1µF LTC6906 1k + 2.25V TO 3.6V OUT V GND GRD DIV SET R SET 100k 2 ...