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ML13150-B9P bảng dữ liệu(PDF) 4 Page - LANSDALE Semiconductor Inc. |
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4 / 20 page ML13150 LANSDALE Semiconductor, Inc. GENERAL DESCRIPTION The ML13150 is a very low power single conversion nar- rowband FM receiver incorporating a split IF. This device can be used as a single conversion or as the backend in analog narrowband FM systems such as 900 MHz cord- less phones, and narrowband data links with data rates up to 9.6 k baud. It contains a mixer, oscillator, extended range received signal strength indicator (RSSI), RSSI buffer, IF amplifier, limiting IF, a unique coilless quadra- ture detector and a device enabler function (see Package Pin Outs/Block Diagram). LOW CURRENT OPERATION The ML13150 is designed for battery and portable applications. Supply current is typically 1.7 mAdc at 3.0 Vdc. Figure 2 shows the supply current versus supply voltage. ENABLE The enable function is provided for battery powered operation. The enabled pin is pulled down to enable the regulators. Figure 3 shows the supply current versus enable voltage, Venable (relative to VCC) needed to enable the device. Note that the device is fully enabled at VCC - 1.3 Vdc. Figure 4 shows the relationship of the enable current, Ienable, to enable voltage, Venable. MIXER The mixer is a double-balanced four quadrant multiplier and is designed to work up to 500 MHz. It has a single ended input. Figure 5 shows the mixer gain and saturated output response as a function of input signal drive and for –10 dBm LO drive level. This is measured in the applica- tion circuit shown in Figure 15 in which a single LC matching network is used. Since the single–ended input impedance of the mixer is 200 Ω, and alternate solution uses a 1:4 impedance transformer to match the mixer to 50 Ω input impedance. The linear voltage gain of the mixer alone is approximately 4.0 dB (plus an additional 6.0 dB for the transformer). Figure 6 shows the mixer gain versus the LO input level for various mixer input levels at 50 MHz RF input. The buffered output of the mixer is internally loaded, resulting in an output impedance of 1.5k Ω. LOCAL OSCILLATOR The on–chip transistor operates with crystal and LC resonant elements up to 220 MHz. Series resonant, overtone crystals are used to achieve excellent local oscillator stability. 3rd overtone crystals are used through about 65 to 70 MHz. Operation for 70 MHz up to 200 MHz is feasible using the on–chip transistor with a 5th or 7th overtone crystal. To enhance operation using an overtone crystal, the internal transistor's bias is increased by adding an external resistor from Pin 29 (in 32 pin QFP package) to VEE to keep the oscillator on continuously or it may be taken to the enable pin to shut is off when the receiver is disabled. –10 dBm of local oscillator drive is needed to adequately drive the mixer (Figure 6). The oscillator configurations specified above are described in the application section. RSSI The received signal strength indicator (RSSI) output is a current proportional to the log of the received signal amplitude. The RSSI current output is derived by summing the currents from the IF and limiting amplifier stages. An external resistor at Pin 25 (in 32 pin QFP package) sets the voltage range or swing of the RSSI output voltage. Linearity of the RSSI is optimized by using external ceramic bandpass filters which have an insertions loss of 4.0 dB. The RSSI circuit is designed to provide 100+ dB of dynamic range with temperature compensation (see Figures 7 and 23 which show the RSSI response of the applications circuit). RSSI BUFFER The RSSI buffer has limitations in what loads it can drive. It can pull loads well towards the positive and negative supplies, but has problems pulling the load away from the supplies. The load should be biased at half supply to overcome this situation. ML13150 CIRCUIT DESCRIPTION www.lansdale.com Page 4 of 20 Issue A |
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