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MAX2821ETM-TD Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX2821ETM-TD Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 26 page 2.4GHz 802.11b Zero-IF Transceivers _______________________________________________________________________________________ 3 DC ELECTRICAL CHARACTERISTICS (continued) (MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, RF_GAIN = VIH, 0V ≤ VTX_GC ≤ +2.0V, 0V ≤ VRX_AGC ≤ +2.0V, RBIAS = 12kΩ, no input signals at RF and baseband inputs, all RF inputs and outputs terminated into 50 Ω, receiver baseband outputs are open, trans- mitter baseband inputs biased at +1.2V, registers set to default power-up settings, TA = -40 °C to +85°C, unless otherwise noted. Typical values are at VCC = +2.7V, TA = +25 °C, unless otherwise noted.) (Note 1) AC ELECTRICAL CHARACTERISTICS—RECEIVE MODE (MAX2820/MAX2821 EV kit: VCC = +2.7V to +3.6V, fRF and fLO = 2400MHz to 2499MHz, fOSC = 22MHz or 44MHz, receive baseband outputs = 500mVP-P, SHDNB = RX_ON = VIH, TX_ON = VIL, CSB = VIH, SCLK = DIN = VIL, RF_GAIN = VIH, 0V ≤ VRX_AGC ≤ +2.0V, RBIAS = 12k Ω, ICP = +2mA, BWPLL = 45kHz, differential RF input matched to 50Ω, registers set to default power-up settings, TA = +25 °C, unless otherwise noted. Typical values are at VCC = +2.7V, fLO = 2437MHz, fOSC = 22MHz, unless otherwise noted.) (Note 1) PARAMETERS CONDITIONS MIN TYP MAX UNITS TX BASEBAND I/O TX BB Input Common-Mode Range 1.0 1.2 1.4 V TX BBI and BBQ Input Bias Current -10 µA TX BB Input Impedance Differential resistance 100 k Ω TX_GC Input Bias Current 0V ≤ VTX_GC ≤ +2.0V 10 µA TX_GC Input Impedance Resistance 250 k Ω REFERENCE OSCILLATOR INPUT Reference Oscillator Input Impedance 20 k Ω PARAMETER CONDITIONS MIN TYP MAX UNITS RECEIVER CASCADE PERFORMANCE (RF INPUT TO BASEBAND OUTPUT) RF Frequency Range 2400 2499 MHz LO Frequency Range 2400 2499 MHz TA = +25°C 97 105 RF_GAIN = VIH, VRX_AGC = 0V TA = -40 °C to +85°C95 RF_GAIN = VIH, VRX_AGC = +2.0V TA = +25 °C33 RF_GAIN = VIL, VRX_AGC = 0V TA = +25 °C75 Voltage Gain (Note 2) RF_GAIN = VIL, VRX_AGC = +2.0V TA = +25 °C2 dB RF Gain Step From RF_GAIN = VIH to RF_GAIN =VIL 30 dB RF_GAIN = VIH, RX gain ≥ 80dB 3.5 RF_GAIN = VIH, RX gain = 50dB 4.5 DSB Noise Figure (Note 3) RF_GAIN = VIL, RX gain = 50dB 34 dB Adjacent Channel Rejection RX gain = 70dB (Note 4) 49 dB RF_GAIN = VIH, RX gain = 80dB -14 Input Third-Order Intercept Point (Note 5) RF_GAIN = VIL, RX gain = 50dB 18 dBm RF_GAIN = VIH, RX gain = 80dB 22 Input Second-Order Intercept Point (Note 6) RF_GAIN = VIL, RX gain = 50dB 60 dBm |
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