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| U3770M CT2 I/Q Modulator and Clock Circuitry Description The U3770M is a quadrature modulator realized using Atmel Wireless & Microcontrollers' advanced 0.8 micron CMOS process. The IC is especially designed for CT2 applications in conjunction with Atmel Wireless & Microcontrollers' RF/IF signal processor U2760B and a CT2 baseband controller (i.e., AMD PhoXTM controller Am79C4xx). Together with Atmel Wireless & Microcontrollers' PLL IC U2783B and the GaAs front end U7001BG, a complete CT2 chip set is available. Electrostatic sensitive device. Observe precautions for handling. Features D Programmable 0.8/1.6-MHz quadrature-modulated carrier generation D More than 26 dB LO and sideband suppression D 18.432 MHz CMOS level clock generation D Supply-voltage range 2.7 V to 3.3 V D Low power consumption, typically 12 mW D SO16 package or die form Block Diagram RRef in 12.8 MHz 2 DIV / 25 Phase 512 kHz comparator LF 11 VCO 14 CLK out 95 9881 Amp. 3 4 13 12 10 6 5 8 7 1, 15, 16 DNC DIV / 2 or DIV / 4 6.4 MHz 3.2 MHz 512 kHz DIV / 36 18.432 MHz VDD DGND AGND PROG TST Qin QBin Iin IBin Dual DFF 9 MOD out Figure 1. Block diagram Ordering Information Extended Type Number U3770M-MFP U3770M-MFPG3 Package SO16 SO16 Tube Taped and reeled Remarks Rev. A3, 07-Sep-00 1 (6) U3770M Functional Description The U3770M has been designed to reduce power consumption and cost of CT2 devices. An innovative CMOS I/Q modulator with extremely low current provides all the advantages of I/Q modulation: - No requirement for FM deviation tuning - Eliminates the Gaussian filter - Simplifies the power ramping control The modulated output carrier can be programmed to be 0.8 MHz or 1.6 MHz by the PROG control pin. The typical supply voltage is 3 V @ 4 mA. To reduce overall system cost, an internal PLL generates an 18.432-MHz clock signal from the system's 12.8-MHz reference oscillator. This way, only one crystal oscillator is needed in the complete CT2 device. Internally, the 12.8-MHz reference signal is fed into a shaping amplifier and then into two logic dividers, to generate a 512-kHz and a programmable 3.2-MHz or 6.4-MHz clock. This clock is divided by 4 by two D flipflops. The flip-flop outputs drive the four analog switches in quadrature. The local oscillator (LO) supression mixer consists of a pair of analog switches. make a local oscillator (LO) suppression mixer. By summing the other pair outputs the suppression (both LO and side tone) is <-26 dBc. The 512-kHz clock drives a frequency synthesizer. The VCO runs at a fixed frequency of 18.432 MHz. The VCO control voltage (LF pin) controls the VCO frequency. Pin Description Pin n.c. FRef in 1 2 16 n.c. 15 n.c. 14 CLKout 13 AGND 12 PROG 11 LF 10 TST 9 MODout 95 9930 Symbol FRef in VDD DGND QBin Qin IBin Iin MODout TST LF PROG AGND CLKout n.c. Function External 12.8-MHz reference frequency input Supply voltage Digital ground Analog switch input Analog switch input Analog switch input Analog switch input Modulator output signal Test input, must be connected to GND (only factory use) PLL loop filter PROG = 0, 1.6-MHz mode PROG = 1, 0.8-MHz mode Analog ground Digital CMOS clock output 18.432 MHz Not connected 2 3 4 5 6 7 8 9 10 11 12 VDD 3 DGND 4 QB 5 Q6 IB I 7 8 13 14 1, 15, 16 Figure 2. Pinning 2 (6) Rev. A3, 07-Sep-00 U3770M Absolute Maximum Ratings Stresses at or above those listed may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in this data sheet is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Modulator input voltages Reference frequency input Ambient temperature Storage temperature Junction temperature Symbol VDD I, IB, Q, QB FRef in Tamb Tstg Tj Value 6 -0.5 to VDD -0.5 to VDD -40 to +85 -65 to +150 Tj < Tamb +10 Unit V V V C C C Operating Range Parameters Supply voltage Ambient temperature Junction temperature Storage temperature Symbol VDD Tamb Tj Tstg Value 3 " 10% -5 to +70 Tj < Tamb +5 -40 to +125 Unit V C C C Electrical Characteristics Test conditions (unless otherwise specified) related to test circuit VS = 3 V, VBIi, VBIi and VBQi, VBQi = 1 VPP single ended, oscillator frequency FRef in = 12.8 MHz, Tamb = -5 to +70C Parameters Supply-voltage range Supply current FRef in Input voltage Input impedance I, Q inputs Input voltage Input impedance Input frequency External bias voltage MODout Output level 1) Test Conditions / Pins Pin 3 Pin 3 Pin 2 Symbol VDD IDD VF Ref in ZF Ref in Min. 2.7 Typ. 3 4 Max. 3.3 Unit V mA mVPP kW 150 100 1 20 18 1.5 70 -26 5 18.432 1.8 Pins 5, 6, 7 and 8 Single ended Single ended VIin, Qin ZIin, Qin FIin, Qin VIB, QB Pin 9 Unloaded VMod out LO sub SB sub ZMod out Pin 14 FCLK out @ load = 20 pF VCLK out MHz V mVRMS dBc kW VPP kW kHz V LO and sideband suppression Output impedance CLKout Output frequency Output-voltage swing Rev. A3, 07-Sep-00 3 (6) U3770M Note 1) The output signal contains some harmonics to be filtered by an external lowpass filter 4 (6) Rev. A3, 07-Sep-00 U3770M Test Circuit 4.7 nF 22 W 95 9967 47 nF R Ref in 12.8 MHz 2 DIV / 25 Phase comparator 512 kHz LF 11 VCO 14 CLK out 3 VDD DGND AGND PROG TST 4 13 12 10 Amp 512 kHz DIV / 36 18.432 MHz DIV / 2 or DIV / 4 6.4 MHz 3.2 MHz Dual DFF 9 MOD out 6 Q in QB in 5 I in 8 IB in 7 1 nF 1 kW 1 kW 1 nF 1 kW 1 nF 1 kW 1 nF Figure 3. Test circuit Rev. A3, 07-Sep-00 5 (6) U3770M Package Information Package: SO16 3. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC Semiconductors products for any unintended or unauthorized application, the buyer shall indemnify TEMIC Semiconductors against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.temic-semi.com TEMIC Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 6 (6) Rev. A3, 07-Sep-00 |
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