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MAX2900 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX2900 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page 200mW Single-Chip Transmitter ICs for 868MHz/915MHz ISM Bands ______________________________________________________________________________________ 11 used on the EV kit board for +23dBm output power at 4.5V, and 22k Ω is also recommended for +20dBm out- put power at +3.0V. For +17dBm at 3.0V, 36k Ω is rec- ommended. The current consumption, efficiency, and distortion in the amplification chain are affected by the choice of the resistor RPWRSET, offering a lot of design flexibility. The VASK pin is an input to the internal gain control cir- cuitry. The gain control is greater than 30dB over the full range of input voltages from 0 to VREG = 2.1V. This input is used for ASK modulation. At 1V, a typical 15dB attenuation is obtained from the peak power. When this input is not used, connect VASK to VREG. The RLPF input controls the modulation filter center fre- quency. The RLPF pin sets the bandwidth of the modulation fil- ter. The default filter bandwidth, obtained with a 68k Ω resistor, is for 1.2Mchips/s. The bandwidth is increased to accommodate 5Mchips/s by decreasing the resistor value to about 26k Ω. The minimum value for the resistor is 12k Ω, which generates the maximum filter band- width. A higher value can be used in FM mode to set up a slow ramp-up time for the PA. Data Filter Characteristics The data filter approximates a 3rd-order Butterworth fil- ter. The 3dB cut-off frequency is adjusted through the resistor on pin RLPF, which controls the first two poles of the filter (the last high-frequency pole is fixed and set around 10MHz). The filter is adjustable in a range from approximately 700kHz to 7MHz. With the nominal setting (3dB cut off at 0.8MHz), the fil- ter attenuation is 10dB at 3.6MHz. If used with a BPSK at 1.22MHz, this provides about 30dB of modulation rolloff at 3.6MHz. Hence, a significant channelization effect is obtained. In the wideband setting (3dB cut off at 5MHz), the attenuation at 30MHz is still 30dB, helping to pass the FCC spurious emissions at 960MHz. 1.2V 100 Ω INTERNAL CIRCUITS PIN RLPF EXTERNAL RESISTOR TO INTERNAL CONTROL CIRCUIT 1.5V >200k Ω INTERNAL CIRCUITS EXTERNAL RESISTOR BRIDGE TO INTERNAL CONTROL CIRCUIT PIN VASK TO VREG (2.1V) Figure 2. PIN VASK Equivalent Circuit Figure 3. PIN RLPF Equivalent Circuit |
Similar Part No. - MAX2900_07 |
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Similar Description - MAX2900_07 |
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