MAX7057 MAXIM [Maxim Integrated Products], MAX7057 Datasheet
MAX7057
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MAX7057 Summary of contents
Page 1
... The fractional-N synthesizer eliminates the problems associated with oscillator-pulling FSK signal generation. The MAX7057 has a serial peripheral interface (SPI™) for selecting all the necessary settings. The MAX7057 is available in a 16-pin SO package and is specified to operate in the -40°C to +125°C automo- tive temperature range. RF Remote Controls ...
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Frequency-Programmable ASK/FSK Transmitter ABSOLUTE MAXIMUM RATINGS Supply Voltage, PAVDD, AVDD, DVDD to AGND, DGND, PAGND ...................................................-0.3V to +4.0V All Other Pins..................................._GND - 0. Continuous Power Dissipation (T = +70°C) A 16-Pin SO (derate 8.7mW/°C above ...
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Frequency-Programmable AC ELECTRICAL CHARACTERISTICS ( Typical Application Circuit , 50Ω system impedance, tuned for 315MHz to 433.92MHz operation, AVDD = DVDD = PAVDD = +2.1V to +3.6V 300MHz to 450MHz, f CRYSTAL DVDD = ...
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Frequency-Programmable ASK/FSK Transmitter AC ELECTRICAL CHARACTERISTICS (continued) ( Typical Application Circuit , 50Ω system impedance, tuned for 315MHz to 433.92MHz operation, AVDD = DVDD = PAVDD = +2.1V to +3.6V 300MHz to 450MHz, f ...
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... RF PA OFF 6 +85°C 6 +125°C A 5.5 5.0 4 +25°C A 4.0 3 -40°C A 3.0 3.6 2.1 2.4 2.7 3.0 3.3 SUPPLY VOLTAGE (V) SUPPLY CURRENT AND OUTPUT POWER vs. EXTERNAL RESISTOR MAX7057 toc09 14 OUTPUT POWER SUPPLY CURRENT 315MHz 0 100 1000 3.6 EXTERNAL RESISTOR (Ω) 3.6 3 -10 -15 ...
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... A vs. EXTERNAL RESISTOR MAX7057 toc11 15 SUPPLY CURRENT -10 OUTPUT POWER -15 - 433.92MHz - 100 1000 10,000 EXTERNAL RESISTOR (Ω) PHASE NOISE vs. OFFSET FREQUENCY ...
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Frequency-Programmable (50Ω system impedance, AVDD = DVDD = PAVDD = +2.1V to +3.6V, f wise noted. Typical values are at AVDD = DVDD = PAVDD = +2.7V, T FREQUENCY STABILITY vs. SUPPLY VOLTAGE ...
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... The fractional-N architecture of the PLL in the MAX7057 allows the FSK signal to be programmed for exact fre- quency deviations and rapid, transient-free frequency settling time. This modulation method completely elimi- ...
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... PA output signal. _______________________________________________________________________________________ ASK/FSK Transmitter Variable Capacitor The MAX7057 has a set of internal variable shunt capacitors that can be switched in and out to present different capacitor values at the PA output. The capaci- tors are connected from the PA output to ground. This allows changing the tuning network along with the syn- ...
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... XTAL1 and XTAL2. In most cases, this corresponds to an 8pF load capacitance applied to the external crystal when typical PCB parasitics are added. The MAX7057 is designed to operate with a typical 10pF load capacitance crystal very important to use a crystal with a load capacitance that is equal to ...
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... The commands available in the MAX7057 SPI are described in detail below: Write: The write command (0x01) is used to program the MAX7057 registers (see Tables 2 and 3). The for- mat shown in Figure 3 must be followed, allowing all the registers to be programmed within one CS cycle. ...
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... Tables 15 and 17 for details). Using a byte descriptive notation, the read command can be viewed as the following sequence, within two CS cycles: CS cycle 1 SDI : <0x03> <Address N> GPO: Reset: The MAX7057 can be reset to its power-up state through the reset command ADDRESS 0x00 N ...
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... The MAX7057 has a buffered clock output that can serve as a clock for a microprocessor. The divide ratio is set through the configuration 0 register (see Tables 5 and 6). The divide settings are 1 (no division ...
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Frequency-Programmable ASK/FSK Transmitter Table 3. Register Configuration NAME ADDRESS BIT 7 CONTRL 0x00 0 CONFIG0 0x01 ckdiv[2] HIFREQ1 0x02 fhi[15] HIFREQ0 0x03 fhi[7] LOFREQ1 0x04 flo[15] LOFREQ0 0x05 flo[7] FLOAD 0x06 — DATAIN 0x07 — EN 0x08 ...
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Frequency-Programmable Table 6. ckdiv[2:0] of Configuration 0 Register (Address: 0x01) DECIMAL BINARY 0 000 1 001 2 010 3 011 4-7 1XX Table 7. High-Frequency 1 Register (Address: 0x02) BIT NAME 7-0 fhi[15:8] 8-bit upper byte of ...
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... Clock/SDO Output. Outputs clock when CS is high and clock output is enabled; outputs SDO when CS is low. SPI Serial Data Output (SDO) Clock Output RESERVED RESERVED Internal Crystal Oscillator Status. High means oscillator is NOT in operation. Transmitter Ready Status. High means PLL is locked and MAX7057 is ready to transmit data. A copy of datain_bit ...
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... Table 17. Status Register (Address: 0x0C) BIT NAME 0 NoXTAL Internal Crystal Oscillator Status. High means oscillator is not in operation. 1 TxREADY Transmitter Ready Status. High means PLL is locked and MAX7057 is ready to transmit data. 2 RESERVED “0” RESERVED. Set to 0 for normal operation RESERVED ASK mode: Outputs flo[15:12]. ...
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... L2 1 Murata LQW18AN13NJ00 R1 1 0Ω resistor (0603 16MHz crystal, Crystek 17466, Suntsu SCX284 18 ______________________________________________________________________________________ 2 1 SDI CS 3 SCLK 4 PAGND C1 5 PAOUT MAX7057 ROUT PAVDD AVDD XTAL2 XTAL1 C10 C11 C9 ...
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... Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2008 Maxim Integrated Products ASK/FSK Transmitter SCLK SDI CS DVDD MAX7057 SERIAL INTERFACE AND DIGITAL CONTROL DELTA-SIGMA MODULATOR FREQUENCY DIVIDER PA VCO PFD ENVELOPE LOOP ...