MAX19708 19-3764 Rev 0 8/05 10-Bit, 11Msps, Ultra-Low-Power Analog Front-End General Description Features Dual 10-Bit, 11Msps Rx ADC and Dual 10-Bit, The MAX19708 is an ultra-low-power, mixed-signal ana- 11Msps Tx DAC log front-end (AFE) designed for TD-SCDMA handsets and data cards. Optimized for high dynamic perfor- Ultra-Low Power mance at ultra-low power, the device integrates a dual 36.9mW at f = 5.12MHz, Fast Mode CLK 10-bit, 11Msps receive (Rx) ADC dual 10-bit, 11Msps 19.8mW at f = 5.12MHz, Slow Mode CLK transmit (Tx) DAC with TD-SCDMA baseband filters Low-Current Standby and Shutdown Modes three fast-settling 12-bit aux-DAC channels for ancillary Integrated TD-SCDMA Filters with > 55dB RF front-end control and a 10-bit, 333ksps housekeep- Stopband Rejection ing aux-ADC. The typical operating power in Tx-Rx Programmable Tx DAC Common-Mode DC Level FAST mode is 36.9mW at a 5.12MHz clock frequency. and I/Q Offset Trim The Rx ADCs feature 55dB SNR and 77.4dBc SFDR at a Excellent Dynamic Performance 1.87MHz input frequency with an 11MHz clock frequen- SNR = 55dB at f = 1.87MHz (Rx ADC) IN cy. The analog I/Q input amplifiers are fully differential SFDR = 73dBc at f = 620kHz (Tx DAC) OUT and accept 1.024V full-scale signals. Typical I/Q P-P Three 12-Bit, 1s Aux-DACs channel matching is 0.08 phase and 0.02dB gain. 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and The Tx DACs with TD-SCDMA lowpass filters feature -3dB Data Averaging cutoff frequency of 1.32MHz and > 55dB stopband rejec- Excellent Gain/Phase Match tion at f = 4.32MHz. The analog I-Q full-scale output IMAGE 0.08 Phase, 0.02dB Gain (Rx ADC) at voltage range is selectable at 410mV or 500mV differ- f = 1.87MHz IN ential. The output DC common-mode voltage is selec- Multiplexed Parallel Digital I/O table from 0.9V to 1.4V. The I/Q channel offset is adjustable to optimize radio lineup sideband/carrier sup- Serial-Interface Control pression. Typical I-Q channel matching is 0.02dB gain Versatile Power-Control Circuits and 0.04 phase. Shutdown, Standby, Idle, Tx/Rx Disable The Rx ADC and Tx DAC share a single, 10-bit parallel, Miniature 48-Pin Thin QFN Package high-speed digital bus allowing half-duplex operation (7mm x 7mm x 0.8mm) for time-division duplex (TDD) applications. A 3-wire serial interface controls power-management modes, the Pin Configuration aux-DAC channels, and the aux-ADC channels. The MAX19708 operates on a single +2.7V to +3.3V TOP VIEW analog supply and +1.8V to +3.3V digital I/O supply. The MAX19708 is specified for the extended (-40C to 29 28 25 36 35 34 33 32 31 30 27 26 +85C) temperature range and is available in a 48-pin, thin QFN package. The Selector Guide at the end of the 24 DAC2 37 D9 23 data sheet lists other pin-compatible versions in this DAC1 38 D8 V 39 22 D7 DD AFE family. 21 IDN 40 D6 Applications IDP 41 20 OV DD GND 19 42 OGND TD-SCDMA Handsets V 43 18 D5 DD MAX19708 17 D4 QDN 44 TD-SCDMA Data Cards QDP 45 16 D3 Portable Communication Equipment EXPOSED PADDLE (GND) 15 REFIN 46 D2 COM 47 14 D1 Ordering Information 13 D0 REFN 48 12 34 5 67 89 10 11 12 PART* PIN-PACKAGE PKG CODE MAX19708ETM 48 Thin QFN-EP** T4877-4 MAX19708ETM+ 48 Thin QFN-EP** T4877-4 THIN QFN *All devices are specified over the -40C to +85C operating range. Functional Diagram and Selector Guide appear at end of **EP = Exposed paddle. +Denotes lead-free package. 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 IAP ADC2 V IAN DD GND GND CLK V DD GND CS V DD SCLK QAN DIN QAP T/R V DOUT DD GND SHDN10-Bit, 11Msps, Ultra-Low-Power Analog Front-End ABSOLUTE MAXIMUM RATINGS V to GND, OV to OGND ..............................-0.3V to +3.6V D0D9, DOUT, T/R, SHDN, SCLK, DIN, CS, DD DD GND to OGND.......................................................-0.3V to +0.3V CLK to OGND .....................................-0.3V to (OV + 0.3V) DD IAP, IAN, QAP, QAN, IDP, IDN, QDP, Continuous Power Dissipation (T = +70C) A QDN, DAC1, DAC2, DAC3 to GND.....................-0.3V to V DD 48-Pin Thin QFN (derate 27.8mW/C above +70C) .....2.22W ADC1, ADC2 to GND.................................-0.3V to (V + 0.3V) Thermal Resistance ..................................................36C/W DD JA REFP, REFN, REFIN, COM to GND ...........-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C DD Junction Temperature......................................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C 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 = 11MHz (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 = 5.12MHz, f = 620kHz on both 10.3 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 = 5.12MHz, f = 620kHz on both 12.6 CLK OUT channels aux-DACs ON and at midscale, aux-ADC ON Ext1-Rx, Ext4-Rx, and SPI3-Rx states receive ADC operating mode (Rx): V Supply Current f = 5.12MHz, f = 1.87MHz on both 12.3 mA DD 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 = 5.12MHz, f = 1.87MHz on both 6.6 CLK IN channels aux-DACs ON and at midscale, aux-ADC ON Ext2-Tx, Ext4-Tx, and SPI4-Tx states transmit DAC operating mode (Tx): f = 11MHz, f = 620kHz on both 14.1 16 CLK OUT channels, aux-DACs ON and at midscale, aux-ADC ON 2 MAX19708