RF109 CONEXANT | Alldatasheet
Document overview
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- PDF pages: 12
Technical content
Features
- Low power dissipation
- Fast settling from standby mode to active mode
- Separate enable lines for transmit, receive, and synthesizer
- 64 programmable channels with 1.8 MHz channel spacing
- 3-battery-cell operation
- 48-pin TQFP package with exposed paddle (refer to Figure 6)
- Receiver − LNA/Quadrature mixer from RF down to baseband − Selectable LNA gain − Integrated baseband filter with external bandwidth adjustment − Receiver baseband amplifier with automatic gain control − Direct conversion with differential baseband outputs − Low system noise figure (9.0 dB typical) − Large dynamic range (89 dB typical)
- Transmitter − Variable gain modulator − Mixer for baseband-to-RF modulation − Differential TX inputs and outputs − Selectable transmitter output levels for high, medium, and low power modes
Applications
- Digital Spread Spectrum (DSS) cordless telephone
- Direct sequence spread spectrum systems
- Frequency hopping spread spectrum systems
- Wireless LANs
- Wireless modems
- Wireless security
- Inventory control systems
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Figure 2. RF109 Block Diagram Control (AGC), which are selected via the LNAATTN control. The receive baseband bandwidth has a bandpass characteristic. connected between pins 32–33, and pins 34–35. mixer modulates the LO with baseband data supplied to pin 8. terminated by a 50Ω resistor (as shown in Figure 5). Transmitter Section of Table 3. the VCO, and the frequency synthesizer programming. VCO2 (pin 39). The typical differential input level is 200 mVp-p. differential signals from a single-ended VCO output.
2400 MHz Digital Spread Spectrum Transceiver RF109
loop filter, and a 2.4 GHz external VCO. Figure 3. Typical Loop Filter voltage supply (Vcc) is at a minimum. Figure 4. Timing Diagram
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Table 1. Swallow Counter Data Input
A typical applications schematic is shown in Figure 5. Decouple all Vcc pins as close as possible to the supply pin. have two vias in parallel for each ground pin. Connect all no connect (NC) pins to the ground. individual decoupling networks. spectrum signal level of 0.10 Vp-p, to the TXD pin (pin 8). traces, preferably by grounded strips on either side of the trace. possible with a characteristic impedance of 50 Ω . Electrostatic Discharge (ESD) precautions. Figure 5. Typical Application Diagram – RF109
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Table 2. RF109 Pin Signal Description (1 of 2) 18 TXEN Input Transmit Enable. Switches on/off bias power to the transmitter circuitry. 9 RXEN Input Receive Enable. Switches on/off bias power to the receiver circuitry. 46 SYNTHEN Input Synthesizer Enable. Switches on/off bias power to the synthesizer circuitry. Transmit Power. These two control bits select the PA output power. 10 LNAATTN Input LNA Attenuator. This control signal toggles the LNA gain between the low gain state and the high gain state. clock provides channel spacing of 1.8 MHz (see Table 1). synthesizer input register. The rising edge of CLK is used to load each data bit. from MSB first to LSB. The DATA bit is loaded into the synthesizer input register on the rising edge of the CLK signal. swallow counter, after all of the data bits have been shifted in. The data is transferred on the rising edge of the STROBE signal. to provide the desired signal level at the TXD input of the RF109. 5 TXREF Input Tx Reference. This is the reference for the TXD input. It is AC-coupled to ground. 23 GCREF Input Gain Control Reference. This is the reference for the gain control input. It is connected to ground. VCO2, required by the RF109. The differential input signal level required is typically 200 mVp-p. 43 CHPO Output Charge Pump Output. This output signal is used to control the external 2.4 GHz VCO. The CHPO current is typically ±250 µA. 50 Ω . The received signal must be AC coupled into LNAIN with a 12 pF series capacitor. RF output signals are internally AC-coupled. The unused signal should be terminated to ground through a 50 Ω resistor.
Table 2. RF109 Pin Signal Description (2 of 2) 20 MODSET — Modulator Gain Setting. Transmit modulator gain can be adjusted by the resistor connected to the pin. 13 GMCRES — GMC resistor to set the cutoff frequency of the baseband filter. 19 MIXBPC — Mixer bias bypass capacitor. — Q channel DC offset cancellation servo capacitor connections. — I channel DC offset cancellation servo capacitor connections. NC — No Connect. It is recommended to connect these pins to ground. 6 VCC1 Supply Positive supply terminal. 7 VCC2 Supply Positive supply terminal. 25 VCC3 Supply Positive supply terminal. 31 VCC4 Supply Positive supply terminal. 44 VCC5 Supply Positive supply terminal. 45 VCC6 Supply Positive supply terminal. 14, 17, 30 GND Supply Power supply ground terminal.
- All digital signals are CMOS compatible.
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Table 3. Electrical Specifications(1) (1 of 3)
Table 3. Electrical Specifications (2 of 3)
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Table 3. Electrical Specifications (3 of 3)
- The specifications in Table 3 are guaranteed at a supply voltage of 3.6 VDC, and T A = 25oC.
- Gain settled to within 90% of final value, DC settled to within 10% of desired signal’s final value.
- TXD input signal 120 mVpp, 300 kHz sinusoidal at pin 8, Rmod = 1.2 k Ω .
Table 4. Absolute Maximum Ratings
- Voltages are referenced to GND.
RF109 device dimensions are shown below in Figure 6.
1.6 MAX
5.5 REF
1.0 REF
0.500 REF
0.220 REF
0.0630 MAX
0.2165 REF
0.0394 REF
0.0197 REF
0.0087 REF
Figure 6. RF109 Device Dimensions Copyright © 2000, Conexant Systems, Inc. All Rights Reserved. responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. Conditions of Sale for such products, Conexant assumes no liability whatsoever. including without limitation, lost revenues or lost profits, which may result from the use of these materials. applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from such improper use or sale.
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