MAX19700 19-3549 Rev 0 2/05 7.5Msps, Ultra-Low-Power Analog Front-End General Description Features The MAX19700 is an ultra-low-power, mixed-signal ana- Dual 10-Bit Rx ADC and Dual 10-Bit Tx DAC log front-end (AFE) designed for TD-SCDMA handsets Ultra-Low Power and data cards. Optimized for high dynamic perfor- 36.3mW at f = 5.12Msps, Fast Mode CLK mance at ultra-low power, the MAX19700 integrates a 19.8mW at f = 5.12Msps, Slow Mode CLK dual 10-bit, 7.5Msps receive (Rx) ADC, dual 10-bit, Low Standby and Shutdown Current 7.5Msps transmit (Tx) DAC with TD-SCDMA baseband filters, and three fast-settling 12-bit aux-DAC channels Integrated TD-SCDMA Filters with >55dB for ancillary RF front-end control. The typical operating Stopband Rejection power in Tx-Rx FAST mode is 36.3mW at a 5.12Msps Excellent Dynamic Performance clock frequency. SINAD = 54.9dB at f = 1.87MHz (Rx ADC) IN The Rx ADCs feature 54.9dB SINAD and 78dBc SFDR SFDR = 76.5dBc at f = 620kHz (Tx DAC) OUT at a 1.87MHz input frequency with a 7.5Msps sample frequency. The analog I/Q input amplifiers are fully dif- Excellent Gain/Phase Match ferential and accept 1.024V full-scale signals. P-P 0.22 Phase, 0.02dB Gain (Rx ADC) at Typical I/Q channel matching is 0.22 phase and f = 1.87MHz at -0.5dBFS IN 0.02dB gain. Three 12-Bit, 1s Aux-DACs The Tx DACs with TD-SCDMA lowpass filters feature -3dB cutoff frequency of 1.27MHz and >55dB stop- Single-Supply Operation band rejection at f = 4.32MHz. The analog I/Q IMAGE Multiplexed Parallel Digital I/O full-scale output voltage range is selectable at 410mV Serial-Interface Control or 500mV. The output common-mode voltage is selec- table from 0.9V to 1.4V and the I/Q channel offset is Versatile Power-Control Circuits adjustable. The typical I/Q channel matching is Shutdown, Standby, Idle, Tx-Rx Disable 0.05dB gain and 0.16 phase. Miniature 48-Pin Thin QFN Package The Rx ADC and Tx DAC share a single, 10-bit parallel, (7mm x 7mm x 0.8mm) high-speed digital bus allowing half-duplex operation for time-division duplex (TDD) applications. A 3-wire serial interface controls power-management modes Pin Configuration and the aux-DAC channels. The MAX19700 operates on a single +2.7V to +3.3V TOP VIEW analog supply and +1.8V to +3.3V digital I/O supply. The MAX19700 is specified for the extended (-40C to +85C) temperature range and is available in a 48-pin, thin QFN package. REFP 1 36 DAC3 Applications 2 35 N.C. V DD 34 IAP 3 N.C. TD-SCDMA Handsets 33 IAN 4 V DD TD-SCDMA Data Cards GND 5 32 GND CLK 31 6 V DD Portable Communication Equipment 30 GND 7 CS MAX19700 Ordering Information V 8 29 SCLK DD QAN 9 28 DIN PART* PIN-PACKAGE PKG CODE EXPOSED PADDLE (GND) 27 QAP 10 T/R V 26 DR DD 11 MAX19700ETM 48 Thin QFN-EP** T4877-4 GND 12 25 SHDN MAX19700ETM+ 48 Thin QFN-EP** T4877-4 *All devices are specified over the -40C to +85C operating range. **EP = Exposed paddle. +Denotes lead-free package. THIN QFN Functional Diagram appears at end of 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 48 D0 13 REFN D1 14 47 COM D2 15 46 REFIN 16 45 D3 QDP D4 17 44 QDN D5 18 43 V DD OGND 19 42 GND 20 41 IDP OV DD D6 21 40 IDN 22 39 D7 V DD 23 38 DAC1 D8 D9 24 37 DAC27.5Msps, Ultra-Low-Power Analog Front-End ABSOLUTE MAXIMUM RATINGS V to GND, OV to OGND ..............................-0.3V to +3.4V Continuous Power Dissipation (T = +70C) DD DD A GND to OGND.......................................................-0.3V to +0.3V 48-Pin Thin QFN (derate 26.3mW/C above +70C) .......2.1W IAP, IAN, QAP, QAN, IDP, IDN, QDP, Thermal Resistance ..................................................38C/W JA QDN, REFP, REFN, REFIN, COM, Operating Temperature Range ...........................-40C to +85C DAC1, DAC2, DAC3 to GND.................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C DD D0D9, DR, T/R, SHDN, SCLK, DIN, CS, Storage Temperature Range .............................-60C to +150C CLK to OGND .....................................-0.3V to (OV + 0.3V) Lead Temperature (soldering, 10s) .................................+300C 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), ADC input DD DD L CLK amplitude = -0.5dBFS, DAC output amplitude = 0dBFS, differential ADC input, differential DAC output, C = C = C = REFP REFN COM 0.33F. Typical values are at T = +25C, unless otherwise noted. C < 5pF on all aux-DAC outputs.) (Note 1) A L 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), 10.3 f = 5.12MHz, f = 620kHz on both CLK OUT channels aux-DACs ON and at midscale Ext2-Tx, Ext4-Tx, and SPI4-Tx states transmit DAC operating mode (Tx), 12.4 f = 5.12MHz, f = 620kHz on both CLK OUT channels aux-DACs ON and at midscale Ext1-Rx, Ext4-Rx, and SPI3-Rx states receive ADC operating mode (Rx), 12.1 f = 5.12MHz, f = 1.87MHz on both CLK IN channels aux-DACs ON and at midscale V Supply Current mA DD Ext2-Rx, Ext3-Rx, and SPI1-Rx modes receive ADC operating mode (Rx), 6.6 f = 5.12MHz, f = 1.87MHz on both CLK IN channels aux-DACs ON and at midscale Ext2-Tx, Ext4-Tx, and SPI4-Tx modes transmit DAC operating mode (Tx), 13.1 16 f = 7.5MHz, f = 620kHz on both CLK OUT channels aux-DACs ON and at midscale Ext1-Tx, Ext3-Tx, and SPI2-Tx modes transmit DAC operating mode (Tx), 10.4 f = 7.5MHz, f = 620kHz on both CLK OUT channels aux-DACs ON and at midscale 2 MAX19700