19-1049; Rev 1; 8/08 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver Features The MAX2838 direct-conversion, zero-IF, RF transceiver is designed specifically for 3.3GHz to 3.9GHz wireless broadband systems. The MAX2838 completely integrates all circuitry required to implement the RF transceiver function, providing RF-to-baseband receive path, baseband-to-RF transmit path, VCO, frequency synthesizer, and baseband/control interface. The device includes a fast-settling sigma-delta RF synthesizer with smaller than 29Hz frequency steps. The MAX2838 supports 2Tx, 2Rx MIMO applications with a master device providing coherent LO to the slave device. The transceiver IC also integrates circuits for on-chip DC-offset cancellation, I/Q error, and carrierleakage detection circuits. Only an RF bandpass filter (BPF), TCXO, RF switch, PA, and a small number of passive components are needed to form a complete wireless broadband RF radio solution. ♦ 3.3GHz to 3.9GHz Wide-Band Operation ♦ Master-Slave Modes with Coherent LO for MIMO ♦ Complete RF Transceiver, and PA Driver 0dBm Linear OFDM Transmit Power -70dBr Tx Spectral Emission Mask 2.8dB Rx Noise Figure Tx/Rx I/Q Error and LO Leakage Detection and Adjustment Automatic Rx DC Offset Correction Monolithic Low-Noise VCO with -39dBc Integrated Phase Noise Programmable Rx I/Q Lowpass Channel Filters Programmable Tx I/Q Lowpass Anti-Aliasing Filter Sigma-Delta Fractional-N PLL with 29Hz Step Size 60dB Tx Gain Control Range with 1dB Step Size, Digitally Controlled 94dB Rx Gain Control Range with 2dB Step Size, Digitally Controlled 60dB Analog RSSI Instantaneous Dynamic Range 4-Wire SPI™ Digital Interface I/Q Analog Baseband Interface Digital Tx/Rx/Shutdown Mode Control Low-Power CLOCKOUT Mode On-Chip Digital Temperature Sensor Readout ♦ +2.7V to +3.6V Transceiver Supply ♦ Low-Power Shutdown Mode ♦ Small 48-Pin Thin QFN Package (6mm x 6mm x 0.8mm) The MAX2838 completely eliminates the need for an external SAW filter by implementing on-chip monolithic filters for both the receiver and transmitter. The baseband filters along with the Rx and Tx signal paths are optimized to meet the stringent noise figure and linearity specifications. The device supports up to 2048-FFT OFDM and implements programmable channel filters for 1.5MHz to 28MHz RF channel bandwidths. The transceiver requires only 2µs Tx-Rx switching time. The IC is available in a small 48-pin thin QFN package measuring only 6mm x 6mm x 0.8mm. Applications Pin Configuration NLOS Wireless Broadband Systems WiMAX is a trademark of the WiMAX Forum. SPI is a trademark of Motorola, Inc. VCCRXMX TXBBQ- TXBBQ+ TXBBI+ TXBBI- VCCRXFL RXHP VCCRXVGA RXBBI+ RXBBI- WiMAX Pico and Femto Basestations RXTX 802.16e MIMO Mobile WiMAX ENABLE 802.16-2004/802.16d Fixed WiMAX™ 48 47 46 45 44 43 42 41 40 39 38 37 + VCCRXLNA 1 36 RXBBQ+ GNDRXLNA 2 35 RXBBQ- B5 3 34 B6 RXRF+ 4 33 B7 RXRF- 5 32 RSSI MAX2838 B4 6 31 DIN VCCTXPAD 7 Ordering Information 30 DOUT B3 8 29 EXTVCO+ B2 9 28 EXTVCO- 15 16 17 18 19 20 21 22 23 24 GNDVCO 14 CPOUT- 13 CPOUT+ 25 VCOBYP *EP = Exposed paddle. +Denotes a lead-free package. T = Tape and reel. GNDCP 26 VCCVCO B1 12 VCCCP TXRF- 11 REFCLK 48 TQFN-EP* VCCDIG -40°C to +85°C CLKOUT 27 VCCLO MAX2838ETM+T SCLK TXRF+ 10 CS PIN-PACKAGE PABIAS TEMP RANGE VCCTMX PART 48 THIN QFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX2838 General Description MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver ABSOLUTE MAXIMUM RATINGS VCC_ Pins to GND..................................................-0.3V to +3.6V RF Inputs: RXRF+, RXRF-, EXTVCO+, EXTVCO- to GND ................................................-0.3V to +3.6V RF Outputs: TXRF+, TXRF-, EXTVCO+, EXTVCO- to GND ................................................-0.3V to +3.6V Analog Inputs: TXBBI+, TXBBI-, TXBBQ+, TXBBQ-, REFCLK to GND ...................................-0.3V to +3.6V Analog Outputs: RXBBI+, RXBBI-, RXBBQ+, RXBBQ-, RSSI, VCOBYP, CPOUT+, CPOUT-, PABIAS to GND ...................................................-0.3V to +3.6V Digital Inputs: ENABLE, RXTX, CS, SCLK, DIN, RXHP B1–B7 to GND ..................................-0.3V to +3.6V Digital Outputs: DOUT, CLKOUT to GND .............-0.3V to +3.6V Short-Circuit Duration Analog Outputs: RXBBI+, RXBBI-, RXBBQ+, RSSI, VCOBYP,RXBBQ-, CPOUT+, CPOUT-, PABIAS, TXRF-, TXRF+ ......................................................10s Digital Outputs: DOUT, CLKOUT .........................................10s RF Input Power: RXRF+, RXRF- .....................................+15dBm RF Output Differential Load VSWR: TXRF+, TXRF- .................6:1 Continuous Power Dissipation (TA = +70°C) 48-Pin Thin QFN (derate 37mW/°C above +70°C) ...... > 2.96W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. CAUTION! ESD SENSITIVE DEVICE DC ELECTRICAL CHARACTERISTICS (MAX2838 Evaluation Kit, VCC_ = 2.7V to 3.6V, TA = -40°C to +85°C, ENABLE and RXTX set according to operating mode, CS = high, SCLK = DIN = low, transmitter and receiver in maximum gain, no input signal at RF inputs, all RF inputs and outputs terminated into 50Ω, receiver baseband outputs are open. 90mVRMS differential I and Q signals (1MHz) applied to I and Q baseband inputs of transmitter in transmit mode, all registers set to recommended settings and corresponding test mode, unless otherwise noted. Typical values are at VCC = 2.8V, fLO = 3.6GHz, and TA = +25°C, unless otherwise noted.) (Note 1) PARAMETERS Supply Voltage CONDITIONS VCC_ 2 MAX UNITS 2.8 3.6 V 12 Standby mode, Single configuration see Tables MIMO master configuration 1 and 2 MIMO slave configuration 35 Tx mode, see Tables 1 and 2 µA 52 44 11 Single configuration 103 MIMO master configuration 112 MIMO slave configuration 80 Single configuration 152 MIMO master configuration 160 MIMO slave configuration 128 Rx calibration mode, see Tables 1 and 2 Single configuration 142 MIMO master configuration 151 MIMO slave configuration 119 Tx calibration mode, see Tables 1 and 2 Single configuration 111 MIMO master configuration 120 MIMO slave configuration D9:D8 = 00 in A4:A0 = 00100 Rx I/Q Output Common-Mode Voltage TYP 2.7 Shutdown mode TA = +25°C Rx mode, see Tables 1 and 2 Supply Current MIN 133 186 mA 182 145 88 0.8 1.0 D9:D8 = 01 in A4:A0 = 00100 1.1 D9:D8 = 10 in A4:A0 = 00100 1.2 D9:D8 = 11 in A4:A0 = 00100 1.35 _______________________________________________________________________________________ 1.2 V 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver (MAX2838 Evaluation Kit, VCC_ = 2.7V to 3.6V, TA = -40°C to +85°C, ENABLE and RXTX set according to operating mode, CS = high, SCLK = DIN = low, transmitter and receiver in maximum gain, no input signal at RF inputs, all RF inputs and outputs terminated into 50Ω, receiver baseband outputs are open. 90mVRMS differential I and Q signals (1MHz) applied to I and Q baseband inputs of transmitter in transmit mode, all registers set to recommended settings and corresponding test mode, unless otherwise noted. Typical values are at VCC = 2.8V, fLO = 3.6GHz, and TA = +25°C, unless otherwise noted.) (Note 1) PARAMETERS CONDITIONS Tx Baseband Input CommonMode Voltage Operating Range DC-coupled Tx Baseband Input Bias Current Source current MIN TYP 0.5 8 MAX UNITS 1.2 V 20 µA 0.4 V LOGIC INPUTS: ENABLE, RXTX, SCLK, DIN, CS, B1:B7, RXHP Digital Input Voltage High, VIH VCC - 0.4 V Digital Input Voltage Low, VIL Digital Input Current High, IIH -1 +1 µA Digital Input Current Low, IIL -1 +1 µA 0.4 V LOGIC OUTPUTS: DOUT Digital Output Voltage High, VOH Sourcing 100µA Digital Output Voltage Low, VOL Sinking 100µA VCC - 0.4 V AC ELECTRICAL CHARACTERISTICS—Rx MODE (MAX2838 Evaluation Kit, VCC_ = 2.8V, TA = +25°C, fLO = 3.6GHz, fRF = 3.601GHz, receiver baseband I/Q outputs at 90mVRMS, fREF = 40MHz, CS = ENABLE = RXTX = high, SCLK = DIN = low, channel bandwidth BW = 7MHz, with power matching for the RF inputs using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted. Unmodulated single-tone RF input signal is used with specifications that normally apply over the entire operating conditions, unless otherwise indicated. Rx I/Q differential output load impedance = 10kΩ || 8pF.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 3.9 GHz RECEIVER SECTION: LNA RF INPUT TO BASEBAND I/Q OUTPUTS RF Input Frequency Range 3.3 Peak-to-Peak Gain Variation over RF Input Frequency Range Tested at band edges and band center RF Input Return Loss All LNA settings Total Voltage Gain TA = -40°C to +85°C RF Gain Steps Gain Change Settling Time Baseband Gain Range Baseband Gain Minimum Step Size Maximum gain, B7:B1 = 0000000 Minimum gain, B7:B1 = 1111111 88 1.8 dB 10 dB 98 5 From max RF gain to max RF Gain - 8dB 8 From max RF gain to max RF gain - 16dB 16 10 dB dB From max RF gain to max RF gain - 32dB 32 Any RF or baseband gain change; gain settling to within ±1dB of steady state; RXHP = 1 200 Any RF or baseband gain change; gain settling to within ±0.1dB of steady state; RXHP = 1 500 From maximum baseband gain (B5:B1 = 00000) to minimum baseband gain (B5:B1 = 11111) 62 dB 2 dB ns _______________________________________________________________________________________ 3 MAX2838 DC ELECTRICAL CHARACTERISTICS (continued) MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued) (MAX2838 Evaluation Kit, VCC_ = 2.8V, TA = +25°C, fLO = 3.6GHz, fRF = 3.601GHz, receiver baseband I/Q outputs at 90mVRMS, fREF = 40MHz, CS = ENABLE = RXTX = high, SCLK = DIN = low, channel bandwidth BW = 7MHz, with power matching for the RF inputs using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted. Unmodulated single-tone RF input signal is used with specifications that normally apply over the entire operating conditions, unless otherwise indicated. Rx I/Q differential output load impedance = 10kΩ || 8pF.) (Note 1) PARAMETER DSB Noise Figure In-Band Input P-1dB Maximum Output Signal Level Out-of-Band Input IP3 (Note 2) CONDITIONS MIN TYP Voltage gain ≥ 65dB with max RF gain (B7:B6 = 00) 2.9 Voltage gain = 50dB with max RF gain - 8dB (B7:B6 = 01) 7.9 Voltage gain = 45dB with max RF gain - 16dB (B7:B6 = 10) 13.7 Voltage gain = 15dB with max RF gain - 32dB (B7:B6 = 11) 31.4 Max RF gain (B7:B6 = 00) -35 Max RF gain - 8dB (B7:B6 = 01) -27 Max RF gain - 16dB (B7:B6 = 10) -19 Max RF gain - 32dB (B7:B6 = 11) -3 Over passband frequency range; at any gain setting; 1dB compression point, differential output 2.5 Max RF gain (B7:B6 = 00), AGC set for -65dBm wanted signal -10 Max RF gain - 8dB (B7:B6 = 01), AGC set for -55dBm wanted signal -5 Max RF gain - 16dB (B7:B6 = 10), AGC set for -40dBm wanted signal -4 Max RF gain - 32dB (B7:B6 = 11), AGC set for -30dBm wanted signal +23 MAX UNITS dB dBm VP-P dBm I/Q Phase Error 1MHz baseband output; 1 σ variation, TA = +25°C 0.15 Degrees I/Q Gain Imbalance 1MHz baseband output; 1 σ variation, TA = +25°C 0.05 dB I/Q Output DC Droop After completion of default power-on on-chip DC cancellation, 1 σ variation ±1 V/s I/Q Static DC Offset No RF input signal; B7:B1 = 0000000, after completion of default power-on on-chip DC cancellation, 1 σ variation ±1.0 mV Loopback Gain (for Receiver I/Q Calibration) Transmitter I/Q input to receiver I/Q output; transmitter B6:B1 = 000011, receiver B5:B1 = 10011 programmed through SPI -7.0 -2 +2.5 dB RECEIVER BASEBAND FILTERS Baseband Highpass Filter Corner Frequency 4 Corner frequency 1 600 Corner frequency 2 100 Corner frequency 3 30 Corner frequency 4 1 Corner frequency 5 0.1 _______________________________________________________________________________________ kHz 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver (MAX2838 Evaluation Kit, VCC_ = 2.8V, TA = +25°C, fLO = 3.6GHz, fRF = 3.601GHz, receiver baseband I/Q outputs at 90mVRMS, fREF = 40MHz, CS = ENABLE = RXTX = high, SCLK = DIN = low, channel bandwidth BW = 7MHz, with power matching for the RF inputs using the typical applications and registers set to default settings and corresponding test mode, unless otherwise noted. Unmodulated single-tone RF input signal is used with specifications that normally apply over the entire operating conditions, unless otherwise indicated. Rx I/Q differential output load impedance = 10kΩ || 8pF.) (Note 1) PARAMETER RF Channel BW Supported by Baseband Filter Baseband Gain Ripple Baseband Group Delay Ripple CONDITIONS MIN TYP A4:A0 = 00010 serial bits D7:D4 = 0000 1.5 A4:A0 = 00010 serial bits D7:D4 = 0001 1.75 A4:A0 = 00010 serial bits D7:D4 = 0010 3.5 A4:A0 = 00010 serial bits D7:D4 = 0011 5.0 A4:A0 = 00010 serial bits D7:D4 = 0100 5.5 A4:A0 = 00010 serial bits D7:D4 = 0101 6.0 A4:A0 = 00010 serial bits D7:D4 = 0110 7.0 A4:A0 = 00010 serial bits D7:D4 = 0111 8.0 A4:A0 = 00010 serial bits D7:D4 = 1000 9.0 A4:A0 = 00010 serial bits D7:D4 = 1001 10.0 A4:A0 = 00010 serial bits D7:D4 = 1010 12.0 A4:A0 = 00010 serial bits D7:D4 = 1011 14.0 A4:A0 = 00010 serial bits D7:D4 = 1100 15.0 A4:A0 = 00010 serial bits D7:D4 = 1101 20.0 A4:A0 = 00010 serial bits D7:D4 = 1110 24.0 A4:A0 = 00010 serial bits D7:D4 = 1111 28.0 MAX UNITS MHz 0 to 3.2MHz for BW = 7MHz 1 dBP-P nsP-P 0 to 3.2MHz for BW = 7MHz 65 At 4.67MHz 7 At > 10.5MHz 53 At > 14MHz 75 At > 29.4MHz 75 RSSI Minimum Output Voltage RLOAD ≥ 10kΩ 0.65 V RSSI Maximum Output Voltage RLOAD ≥ 10kΩ 2.4 V 30 mV/dB Baseband Filter Rejection for 7MHz RF Channel BW dB RSSI RSSI Slope RSSI Output Settling Time To within 3dB of steady state +32dB signal step 200 -32dB signal step 800 ns _______________________________________________________________________________________ 5 MAX2838 AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued) MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver AC ELECTRICAL CHARACTERISTICS—Tx MODE (MAX2838 Evaluation Kit, VCC_ = 2.8V, TA = +25°C, fRF = 3.601GHz , fLO = 3.6GHz. fREF = 40MHz, ENABLE = CS = high, and RXTX = SCLK = DIN = low, with power matching for the differential RF pins using the Typical Operating Circuit. Lowpass filter is set to 7MHz RF channel BW, 90mVRMS sine and cosine signal (or 90mVRMS 64QAM 1024-FFT OFDMA FUSC I/Q signals wherever OFDM is mentioned) applied to baseband I/Q inputs of transmitter (differential DC-coupled). Registers set to recommended settings and corresponding test mode, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 3.9 GHz TRANSMIT SECTION: Tx BASEBAND I/Q INPUTS TO RF OUTPUTS RF Output Frequency Range 3.3 Peak-to-Peak Gain Variation over RF Band 2.6 dB Total Voltage Gain Maximum gain; at unbalanced 50Ω matched output 8 dB Maximum Output Power over Frequency OFDM signal conforming to spectral emission mask and -36dB EVM after I/Q imbalance calibration by modem (Note 3) 0 dBm RF Output Return Loss All gain settings RF Gain Control Range 7 dB 60 dB B1 1 B2 2 B3 4 B4 8 B5 16 B6 32 Unwanted Sideband Suppression Without calibration by modem, and excludes modem I/Q imbalance; POUT = 0dBm -40 dBc Carrier Leakage Relative to 0dBm output power; without calibration by modem -40 dBc Minimum differential resistance 60 kΩ Maximum differential capacitance 0.5 pF Baseband Frequency Response for 7MHz RF Channel BW 0 to 4.67MHz -8 At > 13.23MHz -45 Baseband Group Delay Ripple 0 to 4.9MHz (BW = 7MHz) 15 RF Gain Control Binary Weights Tx I/Q Input Impedance (R || C) dB dB nsP-P AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS (MAX2838 Evaluation Kit, VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, PLL loop bandwidth = 180kHz, charge-pump comparison frequency = 40MHz, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 3.9 GHz FREQUENCY SYNTHESIZER RF Channel Center Frequency 3.3 Channel Center Frequency Programming Minimum Step Size Charge-Pump Comparison Frequency Reference Frequency Range Reference Frequency Input Levels 6 AC-coupled to REFCLK pin 29 Hz 11 40 MHz 11 40 800 _______________________________________________________________________________________ 80 MHz mVP-P 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver (MAX2838 Evaluation Kit, VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, PLL loop bandwidth = 180kHz, charge-pump comparison frequency = 40MHz, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP Programmable Reference Divider Values A4:A0 = 10100, D2:D1 = 00 1 A4:A0 = 10100, D2:D1 = 01 2 Closed-Loop Integrated Phase Noise Loop BW = 180kHz, integrate phase noise from 200Hz to 5MHz Charge-Pump Output Current Close-In Spur Level MAX UNITS -39 dBc On each differential side 0.8 mA fOFFSET = 0 to 1.8MHz -45 dBc fOFFSET = 1.8MHz to 7MHz -70 fOFFSET > 7MHz -80 Reference Spur Level fOFFSET ≥ 40MHz -73 dBc Turnaround LO Frequency Error Relative to steady state; measured 35µs after Tx-Rx or Rx-Tx switching instant, and 4µs after any receiver gain changes ±50 Hz Temperature Range over which VCO Maintains Lock Relative to the initial ambient temperature TA, as long as the final temperature is within operating temperature range TA ± 40 °C CLKOUT Frequency Divider Values A4:A0 = 10100, D6:D5 = 01 (Note 4) CLKOUT Output Swing R = 10kΩ, C = 10pF Low drive 2 1.6 High drive 2.4 VP-P External VCO Input Power MIMO slave mode only -10 dBm External VCO Output Power MIMO master mode only -8 dBm AC ELECTRICAL CHARACTERISTICS—MISCELLANEOUS BLOCKS (MAX2838 Evaluation Kit, VCC = 2.8V, fREF = 40MHz, CS = high, SCLK = DIN = low, and TA = +25°C, unless otherwise noted) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS PA BIAS DAC: CURRENT MODE Numbers of bits 6 Minimum Output Sink Current D5:D0 = 000000 in A4:A0 = 11100 0 µA Maximum Output Sink Current D5:D0 = 111111 in A4:A0 = 11100 310 µA 200 ns 1 LSB Compliance Voltage Range Turn-On Time 0.8 Excludes programmable delay of 0 to 7µs in steps of 0.5µs DNL V PA BIAS DAC: VOLTAGE MODE Output High Level 10mA source current VCC - 0.2 V Output Low Level 10mA sink current 0.1 V Turn-On Time Excludes programmable delay of 0 to 7µs in steps of 0.5µs 200 ns ON-CHIP TEMPERATURE SENSOR Read-out at DOUT pin through SPI A4:A0 = 00111, D4:D0 Digital Output Code Temperature Step Size TA = +25°C 01111 TA = +85°C 11001 TA = -40°C 00100 5 °C _______________________________________________________________________________________ 7 MAX2838 AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS (continued) MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver AC ELECTRICAL CHARACTERISTICS—TIMING (MAX2838 Evaluation Kit, VCC = 2.8V, fLO = 3.6GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, PLL loop bandwidth = 180kHz, and TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM TIMING Channel Switching Time Frequency error settles to ±50Hz Automatic VCO sub-band selection 2 ms Manual VCO sub-band selection 56 µs Measured from Tx or Rx enable rising edge, signal settling to within 0.5dB of steady state Turnaround Time Tx Turn-On Time (from Standby Mode) Rx to Tx 2 Tx to Rx 2 µs Measured from Tx enable rising edge, signal settling to within 0.5dB of steady state Tx Turn-Off Time (to Standby Mode) From Tx-enable falling edge Rx Turn-On Time (from Standby Mode) Measured from Rx enable rising edge, signal settling to within 0.5dB of steady state Rx Turn-Off Time (to Standby Mode) From Rx-enable falling edge 2 µs 0.1 µs 2 µs 0.1 µs 4-WIRE SERIAL INTERFACE TIMING (See Figure 1) SCLK Rising Edge to CS Falling Edge Wait Time tCSO 6 ns Falling Edge of CS to Rising Edge of First SCLK Time tCSS 6 ns DIN to SCLK Setup Time tDS 6 ns DIN to SCLK Hold Time tDH 6 ns SCLK Pulse-Width High tCH 6 ns SCLK Pulse-Width Low tCL 6 ns Last Rising Edge of SCLK to Rising Edge of CS or Clock to Load Enable Setup Time tCSH 6 ns CS High Pulse Width tCSW 20 ns Time Between Rising Edge of CS and the Next Rising Edge of SCLK tCS1 6 ns Clock Frequency fCLK Rise Time 45 MHz tR fCLK / 10 ns Fall Time tF fCLK / 10 ns SCLK Falling Edge to Valid DOUT tD 12.5 ns Note 1: Min and max limits are guaranteed by test above TA = +25°C and are guaranteed by design and characterization at TA = -40°C. The power-on register settings are not guaranteed. Recommended register setting must be loaded after VCC is supplied. Note 2: Two tones at +20MHz and +39MHz offset with -35dBm/tone. Measure IM3 at 1MHz. Note 3: Gain adjusted over max gain and max gain - 3dB. Note 4: VCC rise time (0V to 2.7V) must be less than 1ms. 8 _______________________________________________________________________________________ 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) RECEIVER -40°C +25°C 40 89 LNA = MAX 50 LNA = MAX - 8dB LNA = MAX - 32dB 40 30 GAIN (dB) 97 93 LNA = MAX - 40dB NOISE FIGURE (dB) SUPPLY CURRENT (mA) 101 60 MAX2838toc02 MAX2838toc01 +85°C Rx VOLTAGE GAIN vs. FREQUENCY NOISE FIGURE vs. BASEBAND GAIN SETTING 50 LNA = MAX - 24dB 20 LNA = MAX - 16dB LNA = MAX - 16dB 30 LNA = MAX - 24dB 20 LNA = MAX - 32dB LNA = MAX - 8dB 10 MAX2838toc03a Rx SUPPLY CURRENT vs. SUPPLY VOLTAGE 105 LNA = MAX - 40dB 10 LNA = MAX 3.6 Rx VOLTAGE GAIN vs. BASEBAND GAIN SETTING LNA = MAX - 16dB +25°C +85°C LNA = MAX - 8dB LNA = MAX 40 LNA = MAX - 32dB 0 46 LNA = MAX - 40dB 44 3.4 3.5 3.6 3.7 3.8 3.9 3.8 4.0 1.2 0.8 0.4 LNA = MAX - 24dB 0 -40 3.3 3.6 1.6 MAX2838toc04 MAX2838toc03b 48 3.4 Rx OUTPUT V1dB vs. GAIN SETTING 120 VOLTAGE GAIN (dB) 0 8 16 24 8 0 32 16 24 32 FREQUENCY (MHz) BASEBAND VGA CODE BASEBAND VGA CODE Rx EVM vs. PIN (CHANNEL BANDWIDTH = 10MHz, 64 QAM FUSC) Rx EVM vs. VOUT (CHANNEL BANDWIDTH = 10MHz, 64 QAM FUSC) WiMAX EVM vs. OFDM JAMMER (7MHz CHANNEL BANDWIDTH, 64 QAM FUSC) 12 LNA = MAX - 32dB 10 LNA = MAX - 40dB EVM (%) 14 MAX2838toc08a 12 12 LNA = MAX - 24dB 16 14 fOFFSET = 7MHz 10 EVM (%) 18 16 MAX2838toc06 LNA = MAX - 8dB LNA = MAX - 16dB MAX2838toc07 GAIN (dB) 50 3.2 FREQUENCY (GHz) Rx VOLTAGE GAIN (MAXIMUM LNA GAIN) vs. FREQUENCY 80 3.0 32 BASEBAND VGA CODE 52 EVM (%) 24 16 SUPPLY VOLTAGE (V) -40°C 20 8 0 OUTPUT V1dB (VRMS) 3.3 54 22 0 0 3.0 2.7 MAX2838toc05 85 8 fOFFSET = 14MHz 8 6 8 6 4 4 4 2 0 2 LNA = MAX 0 0 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 PIN (dBm) PWANTED = PSENSITIVITY + 3dB = -71.4dBm AT ANTENNA (INCLUDING 4dB FRONT-END LOSS). EVM AT PSENSITIVITY = 6%, WITHOUT JAMMER. -30 -25 -20 -15 VOUT(dBVRMS) -10 -70 -60 -50 -40 -30 -20 PJAMMER at ANTENNA (dBm) _______________________________________________________________________________________ 9 MAX2838 Typical Operating Characteristics Typical Operating Characteristics (continued) (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) fOFFSET = 10MHz -40 (dBm) 8 6 -60 -70 fOFFSET = 20MHz 4 -50 -80 PWANTED = PSENSITIVITY + 3dB = -70.3dBm AT 2 ANTENNA (INCLUDING 4dB FRONT-END LOSS). EVM AT PSENSITIVITY = 5.85%, WITHOUT JAMMER. 0 -60 -50 -30 -70 -40 -20 29 -60 28 -65 27 -90 -100 -110 0Hz 26 3.3 26.5GHz Rx INPUT RETURN LOSS vs. FREQUENCY (LNA = MAX - 32dB) Rx INPUT RETURN LOSS vs. FREQUENCY (LNA = MAX) 30 40 30 20 10 10 (dB) 20 0 -10 -20 -20 -30 3.3GHz 3.6GHz -40 -30 3.9GHz -50 30kHz -40 6.0GHz LNA = MAX - 16dB 2.0 0 -10 LNA = MAX LNA = MAX - 8dB RSSI VOLTAGE (V) 40 RSSI VOLTAGE vs. INPUT POWER 2.5 MAX2838toc11b MAX2838toc11a 50 1.5 LNA = MAX - 32dB 1.0 3.3GHz 3.6GHz -75 3.9 3.5 3.7 FREQUENCY (GHz) PJAMMER AT ANTENNA (dBm) 50 -70 REAL MAX2838toc12 10 IMAGINARY REAL COMPONENT (Ω) -30 -55 LNA = MAX - 24dB 3.9GHz LNA = MAX - 40dB 0.5 -50 30kHz -100 6.0GHz -70 -40 -10 PIN (dBm) 3V LNA GAIN CONTROL LNA GAIN CONTROL 0V 0V 1.45V 1.5V RSSI OUTPUT 0.45V RSSI 300 LPF GROUP DELAY (ns) 3V Rx LPF GROUP DELAY vs. FREQUENCY 350 MAX2838toc14 MAX2838toc13 Rx RSSI STEP RESPONSE (-40dB SIGNAL STEP) MAX2838toc15 Rx RSSI STEP RESPONSE (+40dB SIGNAL STEP) CHANNEL BW = 5MHz 250 CHANNEL BW = 8MHz CHANNEL BW = 9MHz 200 CHANNEL BW = 10MHz 150 100 50 0.45V 0 200ns/div 200ns/div 0 2 4 6 8 10 FREQUENCY (MHz) 10 ______________________________________________________________________________________ 12 14 16 IMAGINARY COMPONENT (Ω) -20 MAX2838toc10 30 MAX2838toc09 12 EVM (%) -10 MAX2838toc08b 14 Rx INPUT DIFFERENTIAL IMPEDANCE vs. FREQUENCY Rx EMISSION SPECTRUM, LNA INPUT (Tx OFF, LNA = MAX) WiMAX EVM vs. OFDM JAMMER (10MHz CHANNEL BANDWIDTH, 64 QAM FUSC) (dB) MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver Rx DC OFFSET SETTLING RESPONSE (-8dB BB VGA GAIN STEP) 2V/div VGA GAIN CONTROL 2V/div VGA GAIN CONTROL MAX2838toc18 VGA GAIN CONTROL Rx DC OFFSET SETTLING RESPONSE (-16dB BB VGA GAIN STEP) MAX2838toc17 2V/div MAX2838toc16 Rx DC OFFSET SETTLING RESPONSE (+8dB BB VGA GAIN STEP) 10mV/div 10mV/div 10mV/div 10μs/div 10μs/div MAX2838toc21 VGA GAIN CONTROL MAX2838toc20 2V/div Rx BBVGA SETTLING RESPONSE (-8dB BB VGA GAIN STEP) Rx BBVGA SETTLING RESPONSE (+8dB GAIN STEP) MAX2838toc19 Rx DC OFFSET SETTLING RESPONSE (-32dB BB VGA GAIN STEP) 10μs/div 100mV/div 100mV/div 10mV/div 2V/div 10μs/div 200ns/div MAX2838toc24 MAX2838toc23 500mV/div 1V/div VGA GAIN CONTROL Rx LNA SETTLING RESPONSE (MAX TO MAX - 8dB) Rx BBVGA SETTLING RESPONSE (-32dB GAIN STEP) MAX2838toc22 2V/div VGA GAIN CONTROL 200ns/div 200ns/div Rx BBVGA SETTLING RESPONSE (-16dB GAIN STEP) 500mV/div 2V/div VGA GAIN CONTROL 2V/div VGA GAIN CONTROL 200ns/div 2V/div LNA GAIN CONTROL 1μs/div ______________________________________________________________________________________ 11 MAX2838 Typical Operating Characteristics (continued) (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) Typical Operating Characteristics (continued) (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) Rx LNA SETTLING RESPONSE (MAX TO MAX - 16dB) Rx BB FREQUENCY RESPONSE Rx BB FREQUENCY RESPONSE 0 1 0 RESPONSE (dB) RESPONSE (dB) LNA GAIN CONTROL -20 -30 -40 -1 -2 -3 -50 -4 -60 -5 -6 -70 0.1 1μs/div 1 10 0.1 100 395 774 645 996 MAX2838toc29 MEAN = 0 DEV = 51.8mV SAMPLE SIZE = 7839 10 100 HISTOGRAM: Rx STATIC DC OFFSET HISTOGRAM: Rx PHASE IMBALANCE MAX2838toc28 HISTOGRAM: IQ GAIN IMBALANCE 474 1 FREQUENCY (MHz) FREQUENCY (MHz) MEAN = 0 DEV = 0.11878° SAMPLE SIZE = 7841 MEAN = 0 DEV = 0.23981mV SAMPLE SIZE = 7841 830 316 516 664 237 387 498 158 258 332 79 129 166 MAX2838toc30 2V/div MAX2838toc27 2 MAX2838toc26 MAX2838toc25 10 -10 500mV/div 1σ/div 1σ/div 1σ/div POWER-ON DC OFFSET CANCELLATION WITH INPUT SIGNAL POWER-ON DC OFFSET CANCELLATION WITHOUT INPUT SIGNAL TRANSMITTER 200mV/div ENABLE 10mV/div MAX2838toc32 2V/div 157 SUPPLY CURRENT (mA) ENABLE Tx SUPPLY CURRENT vs. SUPPLY VOLTAGE 160 MAX2838toc31b 2V/div MAX2838toc31a MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver +85°C 154 151 -40°C +25°C 148 145 4.00μs/div 2μs/div 2.7 3.0 3.3 SUPPLY VOLTAGE (V) 12 ______________________________________________________________________________________ 3.6 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver -40°C TX GAIN SET TO MAX - 3dB 2 CHANNEL BW = 12MHz -30 CHANNEL BW = 1.75MHz -50 0 -1 POUT (dBm) RESPONSE (dB) 0 -20 -40 Tx OUTPUT POWER vs. FREQUENCY 4 MAX2838toc33a 1 CHANNEL BW = 20MHz -10 RESPONSE (dB) MAX2838toc33 CHANNEL BW = 28MHz 0 Tx BASEBAND FREQUENCY RESPONSE 2 MAX2838toc34 Tx BASEBAND FREQUENCY RESPONSE 10 -2 -3 -2 +25°C +85°C -4 -4 CHANNEL BW = 1.5MHz -60 -6 -5 CHANNEL BW = 5MHz -6 0.1 1 10 0.1 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) Tx OUTPUT POWER vs. GAIN SETTING Tx OUTPUT SPECTRUM 3300 3500 POUT = 0dBm CS (dBc) MASK +25°C 3700 3800 3900 TX GAIN SET TO MAX - 3dB -40 +85°C -45 -30 3600 Tx CARRIER SUPPRESSION vs. FREQUENCY -35 -40°C -10 3400 FREQUENCY (MHz) MAX2838toc36 MAX2838toc35 10 POUT (dBm) -8 100 10dB/div MAX2838toc37 -70 -40°C -50 -55 +25°C +85°C -60 -50 -65 -70 -70 16 32 48 64 3.583GHz 3300 3.625GHz 3400 Tx CARRIER SUPPRESSION vs. GAIN SETTING -30 +85°C TX GAIN SET TO MAX - 3dB 3700 3800 +25°C -40 -35 -40°C -30 MAX2838toc39 -25 3900 +85°C -40 -45 -40°C SS (dBc) -50 -40 SS (dBc) CS (dBc) 3600 Tx SIDEBAND SUPPRESSION vs. GAIN SETTING Tx SIDEBAND SUPPRESSION vs. FREQUENCY MAX2838toc38 -20 -30 3500 FREQUENCY (MHz) TX GAIN CODE MAX2838toc40 0 -60 -50 -50 -40°C -60 -70 -55 +25°C +85°C -60 +25°C -70 -80 -65 -70 -90 0 16 32 TX GAIN CODE 48 64 -80 3300 3400 3500 3600 3700 FREQUENCY (MHz) 3800 3900 0 10 20 30 40 50 60 70 TX GAIN CODE ______________________________________________________________________________________ 13 MAX2838 Typical Operating Characteristics (continued) (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) Typical Operating Characteristics (continued) (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) 0 fLO -10 (dBm) 0.8 MEAN = -46.235dBc DEV = 5.1577dB SAMPLE SIZE = 7841 310 fLO / 3 -20 1.2 372 MAX2838toc42 10 MAX2838toc41 1.6 EVM (%) HISTOGRAM: Tx LO LEAKAGE Tx OUTPUT EMISSION SPECTRUM 2.0 MAX2838toc43 EVM vs. Tx OUTPUT POWER (64 QAM FUSC, 10MHz CHANNEL BANDWIDTH) fLO x 4/3 -30 248 fLO x 2 186 -40 -50 124 -60 0.4 -70 0 -80 -90 -40 -30 -20 -10 62 0Hz 0 1σ/div 26.5GHz POUT (dBm) SYNTHESIZER HISTOGRAM: Tx SIDEBAND SUPPRESSION 40 20 (dB) 10 252 0 -10 168 -20 -30 84 3.3GHz -40 3.6GHz 3.8 3.6 3.4 3.2 3.9GHz -50 30kHz 1σ/div 4.0 LO FREQUENCY (GHz) 30 336 4.2 MAX2838toc46 50 MAX2838toc45 420 MEAN = -47.856dBc DEV = 2.8827dB SAMPLE SIZE = 7841 LO FREQUENCY vs. DIFFERENTIAL TUNE VOLTAGE Tx OUTPUT RETURN LOSS vs. FREQUENCY MAX2838toc44 504 3.0 6.0GHz 0 0.5 1.0 1.5 2.0 2.5 DIFFERENTIAL TUNE VOLTAGE (V) CHANNEL-SWITCHING FREQUENCY SETTLING VCO GAIN vs. DIFFERENTIAL TUNE VOLTAGE (3.3GHz TO 3.9GHz, MANUAL VCO SUB-BAND SELECTION) -70 180.00 160.00 VCO GAIN (MHz/V) -80 -90 -100 -110 -120 50kHz 140.00 120.00 10kHz/div 100.00 80.00 60.00 -130 40.00 -140 20.00 -150 0.0001 MAX2838toc48 -60 -50kHz 0.00 0.001 0.01 0.1 OFFSET FREQUENCY (MHz) 14 200.00 MAX2838toc47 -50 MAX2838toc49a PHASE NOISE vs. OFFSET FREQUENCY PHASE NOISE (dBc/Hz) MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver 1 10 0 0.5 1.0 1.5 2.0 DIFFERENTIAL TUNE VOLTAGE (V) 2.5 0 99.69 TIME (μs) ______________________________________________________________________________________ 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver CHANNEL-SWITCHING FREQUENCY SETTLING (3.9GHz TO 3.3GHz, AUTOMATIC VCO SUB-BAND SELECTION) CHANNEL-SWITCHING FREQUENCY SETTLING (3.9GHz TO 3.3GHz, MANUAL VCO SUB-BAND SELECTION) 10kHz/div MAX2838toc49c 50kHz MAX2838toc49b 50kHz 10kHz/div -50kHz -50kHz 0 99.69 0 1.998 TIME (μs) TIME (ms) CHANNEL-SWITCHING FREQUENCY SETTLING (3.3GHz TO 3.9GHz, AUTOMATIC VCO SUB-BAND SELECTION) 2V/div RXTX RXTX 2V/div 1kHz/div 1kHz/div 10kHz/div MAX2838toc51 MAX2838toc50 MAX2838toc49d 50kHz Tx-TO-Rx TURNAROUND FREQUENCY GLITCH SETTLING Rx-TO-Tx TURNAROUND FREQUENCY GLITCH SETTLING FREQUENCY ERROR FREQUENCY ERROR -50kHz 0 1.998 4μs/div 4μs/div TIME (ms) ______________________________________________________________________________________ 15 MAX2838 Typical Operating Characteristics (continued) (VCC = 2.8V, TA = +25°C, fLO = 3.6GHz, fREF = 40MHz, CS = high, RXHP = SCLK = DIN = low, RF BW = 7MHz, using the MAX2838 Evaluation Kit.) 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver B3 B2 TXRF+ TXRF- RX/TX GAIN CONTROL B1 RXBBI- RXBBI+ VCCRXVGA RXHP VCCRXFL TXBBI- TXBBI+ TXBBQ- 33 TEMP SENSOR RSSI 5 RSSI MUX 32 90° 6 31 SERIAL INTERFACE 0° 7 30 IMUX/QMUX 8 9 CS 29 SCLK AM DETECTOR 28 10 27 MAX2838 11 26 PLL REFERENCE SERIAL INTERFACE BUFFER 12 PABIAS 13 14 15 16 17 18 ÷ 19 20 SERIAL INPUTS REFERENCE SERIAL REFERENCE CLOCK INPUTS CLOCK BUFFER INPUT OUTPUT 16 34 25 21 22 23 RXBBQ+ RXBBQ- RX Q OUTPUTS B6 RX/TX GAIN CONTROL B7 RX GAIN CONTROL RSSI DIN SERIAL INPUTS DOUT SERIAL INPUTS EXTVCO+ EXTVCO- EXTERNAL VCO INPUT OR OUTPUT VCCLO VCCVCO VCOBYP 24 GNDVCO TX OUTPUT RX/TX GAIN CONTROL RX/TX GAIN CONTROL 37 QMUX CPOUT- VCCTXPAD 38 35 CPOUT+ B4 39 TO RSSI MUX GNDCP RX/TX GAIN CONTROL 40 4 VCCCP RXRF- 41 RSSI REFCLK RXRF+ 42 3 VCCDIG B5 43 2 CLKOUT RX/TX GAIN CONTROL 44 36 SCLK RX INPUT 45 IMUX CS GNDRXLNA 46 RX I OUTPUTS 1 VCCTXMX VCCRXLNA 47 VCCRXMX RXTX ENABLE 48 RX BASEBAND HPF CONTROL TX INPUT MODE CONTROL TXBBQ+ MAX2838 Typical Operating Circuit PLL LOOP FILTER ______________________________________________________________________________________ GNDVCO 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver PIN NAME 1 VCCRXLNA 2 GNDRXLNA 3 B5 4 RXRF+ 5 RXRF- FUNCTION LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin. LNA Ground Receiver and Transmitter Gain-Control Logic Input Bit 5 LNA Differential Inputs. Inputs are internally DC-coupled. Two external series capacitors and one shunt inductor match the inputs to 100Ω differential. 6 B4 7 VCCTXPAD Receiver and Transmitter Gain-Control Logic Input Bit 4 8 B3 Receiver and Transmitter Gain-Control Logic Input Bit 3 9 B2 Receiver and Transmitter Gain-Control Logic Input Bit 2 10 TXRF+ 11 TXRF- Supply Voltage for Power-Amplifier Driver. Bypass with a capacitor as close as possible to the pin. Power-Amplifier Driver Differential Output. Outputs are internally DC-coupled. Two external series capacitors and one shunt inductor match the outputs to 100Ω differential. 12 B1 13 PABIAS 14 VCCTXMX 15 CS Chip-Select Logic Input of 4-Wire Serial Interface (See Figure 1) 16 SCLK Serial-Clock Logic Input of 4-Wire Serial Interface (See Figure 1) 17 CLKOUT Reference Clock Divided Output 18 VCCDIG Digital Circuit Supply Voltage. Bypass with a capacitor as close as possible to the pin. 19 REFCLK Reference Clock Input 20 VCCCP PLL Charge-Pump Supply Voltage. Bypass with a capacitor as close as possible to the pin. 21 GNDCP Charge-Pump Circuit Ground 22 CPOUT+ 23 CPOUT- Differential Charge-Pump Output. Connect the frequency synthesizer’s loop filter between CPOUT+ and CPOUT- (see the Typical Operating Circuit). 24 GNDVCO VCO Ground 25 VCOBYP On-Chip VCO Regulator Output Bypass. Bypass with a 1µF capacitor to GND. Do not connect other circuitry to this point. 26 VCCVCO 27 VCCLO 28 EXTVCO- 29 EXTVCO+ 30 DOUT Receiver and Transmitter Gain-Control Logic Input Bit 1 Transmit PA Bias DAC Output Transmitter Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin. VCO Supply Voltage. Bypass with a capacitor as close as possible to the pin. LO Generation Supply Voltage. Bypass with a capacitor as close as possible to the pin. External VCO Differential Input or Output. Input for slave configuration and output for master configuration. Leave unconnected for single configuration. Data Logic Output of 4-Wire Serial Interface (See Figure 1) 31 DIN Data Logic Input of 4-Wire Serial Interface (See Figure 1) 32 RSSI RSSI or Temperature Sensor Multiplexed Analog Output 33 B7 Receiver Gain-Control Logic Input Bit 7 34 B6 Receiver and Transmitter Gain-Control Logic Input Bit 6 35 RXBBQ- 36 RXBBQ+ 37 RXBBI- 38 RXBBI+ 39 VCCRXVGA Receiver Baseband Q-Channel Differential Outputs. In Tx calibration mode, these pins are the LO leakage and sideband detector outputs. Receiver Baseband I-Channel Differential Outputs. In Tx calibration mode, these pins are the LO leakage and sideband detector outputs. Receiver VGA Supply Voltage. Bypass with a capacitor as close as possible to the pin. ______________________________________________________________________________________ 17 MAX2838 Pin Description 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver MAX2838 Pin Description (continued) PIN NAME FUNCTION 40 RXHP 41 VCCRXFL 42 TXBBI- 43 TXBBI+ 44 TXBBQ+ 45 TXBBQ- 46 VCCRXMX 47 RXTX Mode Control Logic Input. See Table 1 for operating modes. 48 ENABLE Mode Control Logic Input. See Table 1 for operating modes. — EP Receiver Baseband AC-Coupling Highpass Corner Frequency Control Logic Input. Connect to ground if not being used. Receiver Baseband Filter Supply Voltage. Bypass with a capacitor as close as possible to the pin. Transmitter Baseband I-Channel Differential Inputs Transmitter Baseband Q-Channel Differential Inputs Receiver Downconverters Supply Voltage. Bypass with a capacitor as close as possible to the pin. Exposed Paddle. Connect to the ground plane with multiple vias for proper operation and heat dissipation. Do not share with any other pin grounds and bypass capacitors’ ground. Table 1. Operating Mode for MIMO Master and Single Configuration (Note 5) MODE CONTROL LOGIC INPUTS MODE CIRCUIT BLOCK STATES SPI REG 16, D1:D0 (Note 6) ENABLE PIN RXTX PIN Rx PATH Tx PATH PLL, VCO CLOCK OUT CALIBRATION SECTIONS ON SHUTDOWN xx 0 0 Off Off Off Off None STANDBY (Note 7) 01 0 1 Off Off On On None CLOCK OUT 00 (Note 11) 0 1 Off Off Off On None Rx 01 1 1 On Off (Note 8) On On None Tx 01 1 0 Off On On On None Tx CALIBRATION (Note 9) 11 1 0 Off On (except PA driver) On On AM detector + RX I,Q buffers Rx CALIBRATION (Note 10) 11 1 1 On (except LNA) On (except PA driver) On On Loopback Note 5: Set SPI Reg 24 D1:D0 = “00” for single-transceiver mode of operation. Set SPI Reg 16 D4:D3 = “11,” Reg 24 D8 = “1,” Reg 24 D1:D0 = “01” for MIMO master configuration. Note 6: Unused states of SPI Reg 16, D1:D0 above are not tested, and therefore, should not be used. Note 7: Parts of transceiver may be selectively enabled. Note 8: PA bias DAC may be kept active in these non-transmit mode(s) by SPI programming. Note 9: Set SPI Reg 5 D5 = “1” to mux AM detector output to RXBB pins. Note 10: Set SPI Reg 26 D3 = “1.” Note 11: CLKOUT signal is active independent of the states of SPI Reg 16, D1:D0, and is only dependent on the states of ENABLE and RXTX pins. However, to ensure that the rest of the chip is off when the CLKOUT is active in the clock-out mode, set SPI Reg 16, D1:D0 to “00” as shown above. 18 ______________________________________________________________________________________ 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver MODE CONTROL LOGIC INPUTS MODE CIRCUIT BLOCK STATES SPI REG 16, D1:D0 (Note 4) ENABLE PIN RXTX PIN Rx PATH Tx PATH PLL, VCO CLOCK OUT CALIBRATION SECTIONS ON SHUTDOWN xx 0 0 Off Off Off Off None STANDBY (Note 7) 01 0 1 Off Off Off On None CLOCK OUT 00 (Note 11) 0 1 Off Off Off On None Rx 01 1 1 On Off (Note 8) Off On None Tx 01 1 0 Off On Off On None Tx CALIBRATION (Note 9) 11 1 0 Off On (except PA driver) Off On AM detector + RX I,Q buffers Rx CALIBRATION (Note 10) 11 1 1 On (except LNA) On (except PA driver) Off On Loop-back Note 12: Set SPI Reg 16 D4:3 = “00,” Reg 24 D8 = “0,” Reg 24 D1:0 = “10” to select the MIMO slave configuration. Detailed Description Configurations The MAX2838 can be configured in a) single mode, for non-MIMO or SISO applications, b) MIMO master mode, and c) MIMO slave mode. Options b) and c) are for MIMO applications where a coherent LO is required for all transmitters and all receivers. Modes of Operation The modes of operation for the MAX2838 are clock-out, shutdown, standby, Tx, Rx, Tx calibration, and Rx calibration. See Table 1 for a summary of the modes of operation. The logic input pins—RXTX (pin 47) and ENABLE (pin 48)—control the various modes. Shutdown Mode (Complete IC Power-Down) All circuit blocks are powered down, except the 4-wire serial bus and its internal programmable registers. Current drain is the minimum possible with the supply voltages applied. If the digital supply voltage is applied at the VCCDIG pin, the registers can be loaded. Standby Mode PLL, VCO, and LO generation blocks are ON, so that Tx or Rx modes can be quickly enabled from this mode. These and other blocks may be selectively enabled in this mode. Rx Mode All Rx circuit blocks are powered on and active. Antenna signal is applied; RF is downconverted, filtered, and buffered at Rx BB I & Q outputs. Tx Mode All Tx circuit blocks are powered on. The external PA is powered on after a programmable delay. Clock-Out Only Only the clock-out signal is active on the CLKOUT pin. The clock output divider is also functional. The rest of the transceiver is powered down. Rx Calibration Part of the Rx and Tx circuit blocks except the LNA and PA driver are powered on and active. The transmitter IQ input signal is upconverted to RF and at the output of the Tx gain control (VGA). It is fed to the receiver at the input of the downconverter. Either or both of the two receiver channels can be connected to the transmitter and powered on. The I/Q lowpass filters are not present in the transmitter signal path (they are bypassed). Tx Calibration All Tx circuit blocks except the PA driver and external PA are powered on and active. The AM detector and receiver I/Q channel buffers are also on, along with multiplexers in receiver side to route this AM detector’s signal to each I and Q differential lines. ______________________________________________________________________________________ 19 MAX2838 Table 2. Operating Mode for MIMO Slave Configuration (Note 12) MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver Chip Information Programmable Registers and 4-Wire SPI-Interface PROCESS: BiCMOS The MAX2838 includes 32 programmable 16-bit registers. The most significant bit (MSB) is the read/write selection bit. The next 5 bits are register addresses. The 10 least significant bits (LSBs) are register data. Register data is loaded through the 4-wire SPI/MICROWIRE™-compatible serial interface. Data at the DIN pin is shifted in MSB first and is framed by CS. When CS is low, the clock is active, and input data is shifted at the rising edge of the clock. During the read mode, register data selected by address bits is shifted out to the DOUT pin at the falling edges of the clock. At CS rising edge, the 10-bit data bits are latched into the register selected by address bits. See Figure 1. MICROWIRE is a trademark of National Semiconductor Corp. DOUT DON’T CARE DIN BIT 1 BIT 2 BIT 5 BIT 6 BIT 13 BIT 14 SCLK tCH tCS1 tDS CS tCL tCSO tDH tCSS tCSH tCSW SPI REGISTER WRITE DOUT DON’T CARE BIT 6 BIT 13 tD DIN BIT 1 BIT 2 BIT 5 DON’T CARE SCLK CS SPI REGISTER READ Figure 1. 4-Wire SPI Serial-Interface Timing Diagram 20 ______________________________________________________________________________________ BIT 14 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 48 TQFN-EP T4866+2 21-0141 ______________________________________________________________________________________ 21 MAX2838 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. MAX2838 3.3GHz to 3.9GHz Wireless Broadband RF Transceiver Revision History PAGES CHANGED REVISION NUMBER REVISION DATE 0 10/07 Initial release — 1 8/08 Removed CLKOUT frequency divide-by-1 ratio in AC Electrical Characteristics—Frequency Synthesis table 7 DESCRIPTION Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.