CF5074B VCXO Module IC with Built-in Varicap
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1 XO Module IC with Built-in Varicap OVERVIEW The CF574B is XO module IC with built-in varicap diodes. The integrated varicap diode BiCMOS process allows the device to be fabricated on a single chip. newly developed oscillator circuit features reduced drive level of crystal and wide pullrange. XO module can be constructed with just the connection of a crystal unit, making the devices ideal as surface-mounted, compact XO modules. FETURES 2.25 to 3.6V operating supply voltage range 5MHz to 8MHz operating frequency range Varicap diode built-in Oscillation start-up detector function CMOS output duty level 4m (min) output drive capability 15pF output load Standby function High impedance in standby mode BiCMOS process Chip form (CF574B) PPLICTIONS XO modules ORDERING INFORMTION Device CF574B 1 CF574B 3 Package Chip form SEIKO NPC CORPORTION 1
2 PD LYOUT (Unit: µm) (17,127) 5 4 N 6 7 TESN 8 D574B 3 (,) 1 2 Chip size: mm Chip thickness: 3 ± 3µm (CF574B-1) 18 ± 2µm (CF574B-3) PD size: 1 1µm (TESN: 8 8µm) Chip base: V SS potential PD DESCRIPTION ND DIMENSIONS Pad No. Name I/O Description Pad dimensions [µm] 1 ( ) supply pin O Output pin. High-impedance in standby mode (+) supply pin N O Oscillator output. Crystal connection pin I Oscillator input. Crystal connection pin I Oscillation frequency control voltage input pin. Positive polarity (frequency increases with increasing voltage) I Output state control voltage input pin. Standby mode when LOW. Power-saving pull-up resistor built-in TESN I Test pin (leave open) X Y BLOCK DIGRM N Oscillator Detection R3 RUP R1 C1 R2 C2 CMOS Output Buffer SEIKO NPC CORPORTION 2
3 BSOLUTE MXIMUM RTINGS V SS = V unless otherwise noted. Parameter Symbol Rating Unit Supply voltage range V DD.5 to 7. V Input voltage range V IN.5 to V DD +.5 V Output voltage range V OUT.5 to V DD +.5 V Storage temperature range T STG 65 to +15 C Output current I OUT 2 m RECOMMENDED OPERTING CONDITIONS V SS = V unless otherwise noted. Parameter Symbol Rating Min Typ Max Unit Operating supply voltage V DD V Output frequency f OUT 5 8 MHz Output load capacitance C L 15 pf Input voltage V IN V SS V DD V Operating temperature T OPR C SEIKO NPC CORPORTION 3
4 ELECTRICL CHRCTERISTICS V DD = 2.25 to 3.6V, V C =.5V DD, V SS = V, Ta = 4 to +85 C unless otherwise noted. Parameter Symbol Conditions Rating Min Typ Max Unit Current consumption I DD load circuit 1, = open, Measurement circuit 2, C L = 15pF, f = 8MHz V DD = 2.25 to 2.75V 2 3 m V DD = 3. to 3.6V m HIGH-level output voltage V OH : Measurement circuit 1, I OH = 4m V DD.4 V DD.2 V LOW-level output voltage V OL : Measurement circuit 1, I OL = 4m.2.4 V Output leakage current I Z : Measurement circuit 6, = LOW V OH = V DD 1 µ V OL = V SS 1 µ HIGH-level input voltage V IH.7V DD V LOW-level input voltage V IL.3V DD V pull-up resistance Oscillator block built-in resistance R = V SS MΩ UP1 Measurement circuit 3 R UP2 =.7V DD kω R kω R 2 Measurement circuit kω R kω Oscillator block built-in capacitance C Capacitance of C 1 and C 2 V C =.3V pf V C = 1.65V pf V C = 3.V pf input resistance R VIN Measurement circuit 7, Ta = 25 C 1 MΩ input impedance Z VIN Measurement circuit 8, V C = V, f = 1kHz, Ta = 25 C 25 kω input capacitance C VIN Measurement circuit 8, V C = V, f = 1kHz, Ta = 25 C 6 pf Modulation bandwidth fm Measurement circuit 9, 3dB frequency, V DD = 3.3V, V C = 3.3Vp-p, Ta = 25 C, crystal: f = 8MHz, C = 4.8pF, γ 44 3 khz SWITCHING CHRCTERISTICS V DD = 2.25 to 3.6V, V C =.5V DD, V SS = V, Ta = 4 to +85 C unless otherwise noted. Parameter Symbol Conditions Rating Min Typ Max Unit Output rise time t r1 Measurement circuit 2, load circuit 1,.2V DD.8V DD, Ta = 25 C, C L = 15pF Output fall time t f1 Measurement circuit 2, load circuit 1,.8V DD.2V DD, Ta = 25 C, C L = 15pF ns ns Output duty cycle Duty Measurement circuit 2, load circuit 1, Ta = 25 C, C L = 15pF V DD = 2.5V % V DD = 3.3V % Output disable delay time t PLZ Measurement circuit 5, load circuit 1, Ta = 25 C, 1 ns Output enable delay time t PZL C L 15pF 1 ns SEIKO NPC CORPORTION 4
5 MESUREMENT CIRCUITS Measurement Circuit 1 Measurement Circuit 4 When measuring VOL When measuring VOH TESN V VN I V N ( VN) R1 = I R2 = ( V) IN Measurement Circuit 2 IN N R3 = VN I V V Crystal N Measurement Circuit 5 V C =.5V DD, = open, crystal oscillation Signal Generator C1 Measurement Circuit 3 R1 RUP1 = IRUP (.7) RUP2 = IRUP (VRUP = ) (VRUP =.7) input signal: 1MHz, 1.Vp-p C1 =.1µF, R1 = 5Ω, V C =.5V DD V IRUP VRUP Measurement Circuit 6 V C =.5V DD V C = 1/2V DD SEIKO NPC CORPORTION 5
6 Measurement Circuit 7 Measurement Circuit 9 R = I I Gain-phase nalyzer (HP4194) Modulaiton nalyzer (HP891B) Modulation signal C1 Demodulation signal R1 R2 N Crystal Measurement Circuit 8 C1 = 2µF, R1 = R2 = 1MΩ, V DD = 3.3V modulation signal: 1Hz to 1kHz, 3.3Vp-p Load Circuit 1 output Impedance nalyzer (HP4194) CL (Including probe capacitance) input signal: 1Hz to 1kHz,.1Vp-p, V C = V SEIKO NPC CORPORTION 6
7 Switching Time Measurement Waveform Output duty level, t r, t f output DUTY measurement voltage (.5V DD) TW tr tf Output duty cycle output DUTY measurement voltage (.5) TW T DUTY= TW/ T 1 (%) Output Enable/Disable Delay Times VIL VIH tplz tpzl output input waveform tr = tf 1ns SEIKO NPC CORPORTION 7
8 FUNCTIONL DESCRIPTION Standby Function When goes LOW, the device is in standby mode. The output becomes high impedance and the oscillator circuit continues running. Oscillator HIGH (or open) f O Operating LOW High impedance Operating Power-saving Pull-up Resistor The pin pull-up resistance changes in response to the input level (HIGH or LOW). When is tied LOW, the pull-up resistance becomes large, reducing the current consumed by the resistance. When is left open, the pull-up resistance becomes small, such that even if the input is affected by external noise the outputs are stable due to being tied HIGH by the pull-up resistor. Oscillation Start-up Detector Function The devices also feature an oscillation start-up detector circuit. This circuit functions to disable the outputs until the oscillation starts. This prevents unstable oscillator output at oscillator start-up when power is applied. SEIKO NPC CORPORTION 8
9 TYPICL CHRCTERISTICS The following characteristics measured using the crystal for NPC characteristics authentication. Note that the characteristics will vary with the crystal used. Frequency Pullrange, Oscillator Equivalent Capacitance (C L ) Characteristics Frequency [ppm] Frequency [ppm] [V] [V] V DD = 2.5V (V C = 1.25V reference) V DD = 3.3V (V C = 1.65V reference) CL [pf] 1 8 CL [pf] [V] [V] V DD = 2.5V V DD = 3.3V Measurement circuit Crystal N Crystal: f = 8MHz, C = 4.8pF, γ = 44 C L : Oscillator equivalent capacitance is determined by the oscillator frequency. SEIKO NPC CORPORTION 9
10 Negative Resistance Characteristics Frequency [MHz] Frequency [MHz] Negative resistance [Ω] = V = 1.25V = 2.5V Negative resistance [Ω] = V = 1.65V = 3.3V 1 1 V DD = 2.5V V DD = 3.3V Measurement circuit HP8753B Network nalyzer S2 + HP8546 S1 S-Parameter Test Set N Modulation Characteristics fm [db] 1.E Frequency [khz] 1.E+1 1.E+2 Measurement circuit Gain-phase nalyzer (HP4194) Modulaiton nalyzer (HP891B) Modulation signal C1 Demodulation signal R1 R2 C1 = 2µF, R1 = R2 = 1MΩ, V DD = 3.3V modulation signal: 1Hz to 1kHz, 3.3Vp-p N Crystal SEIKO NPC CORPORTION 1
11 Output Waveform Measurement equipment Oscilloscope: (gilent) V DD = 2.5V, 15pF load, V C = 1.25V V DD = 3.3V, 15pF load, V C = 1.65V SEIKO NPC CORPORTION 11
12 Relation Between Pulling Range and Constants for Crystal Units = V to 3.3V γ = 337 γ = 3 Pulling range [ppm] γ = 411 γ = 39 γ = 518 γ = 516 γ = 42 γ = 498 γ = 324 γ = 315 γ = 368 γ = 4 γ = 44 γ = C [pf] Measurement data when crystal is changed. B C D E F G H I J L C [pf] γ Pulling range 1 [ppm] Pulling range: Value of changes in voltage from V to 3.3V. Measurement circuit Crystal N to 3.3V SEIKO NPC CORPORTION 12
13 Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter Products ) are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORTION (hereinafter NPC ). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. ny descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SEIKO NPC CORPORTION 1-9-9, Hatchobori, Chuo-ku, Tokyo 14-32, Japan Telephone: Facsimile: sales@npc.co.jp NC716E SEIKO NPC CORPORTION 13
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