MAX19705 19-3763 Rev 0 8/05 10-Bit, 7.5Msps, Ultra-Low-Power Analog Front-End General Description Features The MAX19705 is an ultra-low-power, mixed-signal ana- Dual 10-Bit, 7.5Msps Rx ADC and Dual 10-Bit, log front-end (AFE) designed for power-sensitive com- 7.5Msps Tx DAC munication equipment. Optimized for high dynamic Ultra-Low Power performance at ultra-low power, the device integrates a 28.2mW at f = 7.5MHz, Fast Mode CLK dual 10-bit, 7.5Msps receive (Rx) ADC dual 10-bit, 21mW at f = 7.5MHz, Slow Mode CLK 7.5Msps transmit (Tx) DAC three fast-settling 12-bit Low-Current Standby and Shutdown Modes aux-DAC channels for ancillary RF front-end control and a 10-bit, 333ksps housekeeping aux-ADC. The typ- Programmable Tx DAC Common-Mode DC Level ical operating power in Tx-Rx FAST mode is 28.2mW at and I/Q Offset Trim a 7.5MHz clock frequency. Excellent Dynamic Performance The Rx ADCs feature 55.1dB SNR and 73.4dBc SFDR at SNR = 55.1dB at f = 1.875MHz (Rx ADC) IN a 1.875MHz input frequency with a 7.5MHz clock fre- SFDR = 77.2dBc at f = 620kHz (Tx DAC) OUT quency. The analog I/Q input amplifiers are fully differen- Three 12-Bit, 1s Aux-DACs tial and accept 1.024V full-scale signals. Typical I/Q P-P channel matching is 0.01 phase and 0.02dB gain. 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and Data Averaging The Tx DACs feature 77.2dBc SFDR at f = 620kHz OUT and f = 7.5MHz. The analog I/Q full-scale output CLK Excellent Gain/Phase Match voltage is 400mV differential. The Tx DAC common- 0.01 Phase, 0.02dB Gain (Rx ADC) at mode DC level is programmable from 0.9V to 1.35V. f = 1.875MHz IN The I/Q channel offset is adjustable. The typical I/Q Multiplexed Parallel Digital I/O channel matching is 0.03dB gain and 0.08 phase. Serial-Interface Control The Rx ADC and Tx DAC share a single, 10-bit parallel, high-speed digital bus allowing half-duplex operation Versatile Power-Control Circuits for time-division duplex (TDD) applications. A 3-wire Shutdown, Standby, Idle, Tx/Rx Disable serial interface controls power-management modes, the Miniature 48-Pin Thin QFN Package aux-DAC channels, and the aux-ADC channels. (7mm x 7mm x 0.8mm) The MAX19705 operates on a single +2.7V to +3.3V analog supply and +1.8V to +3.3V digital I/O supply. Pin Configuration The MAX19705 is specified for the extended (-40C to +85C) temperature range and is available in a 48-pin, thin QFN package. The Selector Guide at the end of the TOP VIEW data sheet lists other pin-compatible versions in this AFE family. 29 28 25 36 35 34 33 32 31 30 27 26 Applications DAC2 37 24 D9 23 Broadband Access Radio DAC1 38 D8 22 V 39 D7 DD Private Mobile Radio (PMR) IDN 40 21 D6 Portable Communication Equipment 41 20 OV IDP DD GND 19 42 OGND Ordering Information 18 V 43 D5 DD MAX19705 QDN 44 17 D4 PART* PIN-PACKAGE PKG CODE 16 D3 QDP 45 EXPOSED PADDLE (GND) 15 REFIN 46 D2 MAX19705ETM 48 Thin QFN-EP** T4877-4 COM 47 14 D1 MAX19705ETM+ 48 Thin QFN-EP** T4877-4 48 13 D0 REFN *All devices are specified over the -40C to +85C operating 89 12 12 34 5 67 10 11 range. **EP = Exposed paddle. +Denotes lead-free package. Functional Diagram and Selector Guide appear at end of THIN QFN data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE DAC3 REFP V DD ADC1 ADC2 IAP IAN V DD GND GND CLK V DD GND CS V DD SCLK QAN DIN QAP T/R V DOUT DD GND SHDN10-Bit, 7.5Msps, Ultra-Low-Power Analog Front-End ABSOLUTE MAXIMUM RATINGS V to GND, OV to OGND ..............................-0.3V to +3.6V Continuous Power Dissipation (T = +70C) DD DD A GND to OGND.......................................................-0.3V to +0.3V 48-Pin Thin QFN (derate 27.8mW/C above +70C) .....2.22W IAP, IAN, QAP, QAN, IDP, IDN, QDP, Thermal Resistance ..................................................36C/W JA QDN, DAC1, DAC2, DAC3 to GND.....................-0.3V to V Operating Temperature Range ...........................-40C to +85C DD ADC1, ADC2 to GND.................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C DD REFP, REFN, REFIN, COM to GND ...........-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD D0D9, DOUT, T/R, SHDN, SCLK, DIN, CS, Lead Temperature (soldering, 10s) .................................+300C CLK to OGND .....................................-0.3V to (OV + 0.3V) DD 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. ELECTRICAL CHARACTERISTICS (V = 3V, OV = 1.8V, internal reference (1.024V), C 10pF on all digital outputs, f = 7.5MHz (50% duty cycle), Rx ADC input DD DD L CLK amplitude = -0.5dBFS, Tx DAC output amplitude = 0dBFS, differential Rx ADC input, differential Tx DAC output, C = C = REFP REFN C = 0.33F, unless otherwise noted. C < 5pF on all aux-DAC outputs. Typical values are at T = +25C.) (Note 1) COM L A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER REQUIREMENTS Analog Supply Voltage V 2.7 3.0 3.3 V DD Output Supply Voltage OV 1.8 V V DD DD Ext1-Tx, Ext3-Tx, and SPI2-Tx states transmit DAC operating mode (Tx): f = 7.5MHz, f = 620kHz on both 7.4 CLK OUT channels aux-DACs ON and at midscale, aux-ADC ON Ext2-Tx, Ext4-Tx, and SPI4-Tx states transmit DAC operating mode (Tx): f = 7.5MHz, f = 620kHz on both 9.6 12.5 CLK OUT channels aux-DACs ON and at midscale, aux-ADC ON V Supply Current mA DD Ext1-Rx, Ext4-Rx, and SPI3-Rx states receive ADC operating mode (Rx): f = 7.5MHz, f = 1.875MHz on both 9.4 11 CLK IN channels aux-DACs ON and at midscale, aux-ADC ON Ext2-Rx, Ext3-Rx, and SPI1-Rx states receive ADC operating mode (Rx): f = 7.5MHz, f = 1.875MHz on both 7 CLK IN channels aux-DACs ON and at midscale, aux-ADC ON 2 MAX19705