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LTC6908CS6-2 Datasheet(PDF) 6 Page - Linear Technology |
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LTC6908CS6-2 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC6908-1/LTC6908-2 6 690812fa BLOCK DIAGRA OUT1 690812 BD OUT2 V+ V+ GND SET 3 MOD 4 GND 2 6 1 5 COMPLEMENTARY OR QUADRATURE OUTPUTS MUTE OUTPUT UNTIL STABLE POR 1-POLE LPF 0 90/180 DIVIDE BY 16/32/64 3-STATE INPUT DECODER DETECT CLOCK INPUT WHEN A CLOCK SIGNAL IS PRESENT AT THE MOD INPUT, DISABLE THE MODULATION. DIVIDER SELECT PSEUDO RANDOM CODE GENERATOR – + GAIN = 1 V+ – V(SET) ≈ 1.13V fMASTER = 20MHz • 10k • fOUT = fMASTER/2 = 20MHz • 10k/RSET V+ – V(SET) MASTER OSCILLATOR IMASTER IMASTER IREF MDAC CLK 2 µA 2 µA VBIAS RSET OUT V + – + – ISET = RSET V+ – V(SET) PI FU CTIO S SET (Pin 1/Pin 3): Frequency-Setting Resistor Input. The value of the resistor connected between this pin and V+ determines the oscillator frequency. The voltage on this pin is held by the LTC6908 to approximately 1.1V below the V+ voltage. For best performance, use a precision metal film resistor with a value between 20k and 400k and limit the capacitance on this pin to less than 10pF. V+ (Pin 2/Pin 1): Voltage Supply (2.7V ≤ V+ ≤ 5.5V). This supply must be kept free from noise and ripple. It should be bypassed directly to a ground plane with a 0.1µF capacitor. GND (Pin 3/Pin 2): Ground. Should be tied to a ground plane for best performance. OUT1 (Pin 4/Pin 6), OUT2 (Pin 5/Pin 5): Oscillator Out- puts. These pins can drive 5k and/or 10pF loads. Larger loads may cause inaccuracies due to supply bounce at high frequencies. MOD (Pin 6/Pin 4): Modulation-Setting Input. This three- state input selects among four modulation rate settings. The MOD pin should be tied to ground for the fOUT/16 modulation rate. Floating the MOD pin selects the fOUT/32 modulation rate. The MOD pin should be tied to V+ for the fOUT/64 modulation rate. Tying one of the outputs to the MOD pin turns the modulation off. To detect a floating MOD pin, the LTC6908 attempts to pull the pin toward midsupply. This is realized with two internal current sources, one tied to V+ and MOD and the other one tied to ground and MOD. Therefore, driving the MOD pin high requires sourcing approximately 2µA. Likewise, driving the MOD pin low requires sinking 2µA. When the MOD pin is floated, it must be bypassed by a 1nF capacitor to ground. Any AC signal coupling to the MOD pin could potentially be detected and stop the frequency modulation. Exposed Pad (Pin 7/NA): Ground. The Exposed Pad must be soldered to PCB. (DCB Package/S6 Package) (S6 Package Pin Numbers) |
Similar Part No. - LTC6908CS6-2 |
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Similar Description - LTC6908CS6-2 |
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