MAX19706 19-3867 Rev 0 10/05 10-Bit, 22Msps, Ultra-Low-Power Analog Front-End General Description Features The MAX19706 is an ultra-low-power, mixed-signal ana- Dual, 10-Bit, 22Msps Rx ADC and Dual, 10-Bit, log front-end (AFE) designed for power-sensitive com- 22Msps Tx DAC munication equipment. Optimized for high dynamic Ultra-Low Power performance at ultra-low power, the device integrates a 49.5mW at f = 22MHz, Fast Mode CLK dual, 10-bit, 22Msps receive (Rx) ADC dual, 10-bit, 39.3mW at f = 22MHz, Slow Mode CLK 22Msps transmit (Tx) DAC three fast-settling 12-bit aux- Low-Current Standby and Shutdown Modes DAC channels for ancillary RF front-end control and a 10-bit, 333ksps housekeeping aux-ADC. The typical Programmable Tx DAC Common-Mode DC Level operating power in Tx-Rx FAST mode is 49.5mW at a and I/Q Offset Trim 22MHz clock frequency. Excellent Dynamic Performance The Rx ADCs feature 54.6dB SNR and 75.6dBc SFDR at SNR = 54.6dB at f = 5.5MHz (Rx ADC) IN a 5.5MHz input frequency with a 22MHz clock frequen- SFDR = 72.6dBc at f = 2.2MHz (Tx DAC) OUT cy. The analog I/Q input amplifiers are fully differential Three 12-Bit, 1s Aux-DACs and accept 1.024V full-scale signals. Typical I/Q P-P channel matching is 0.12 phase and 0.01dB gain. 10-Bit, 333ksps Aux-ADC with 4:1 Input Mux and Data Averaging Mode The Tx DACs feature 72.6dBc SFDR at f = 2.2MHz OUT and f = 22MHz. The analog I/Q full-scale output volt- CLK Excellent Gain/Phase Match age is 400mV differential. The Tx DAC common-mode 0.12 Phase, 0.01dB Gain (Rx ADC) at DC level is programmable from 0.9V to 1.35V. The I/Q f = 5.5MHz IN channel offset is adjustable. The typical I/Q channel Multiplexed Parallel Digital I/O matching is 0.02dB gain and 0.1 phase. Serial-Interface Control The Rx ADC and Tx DAC share a single, 10-bit parallel, high-speed digital bus allowing half-duplex operation for Versatile Power-Control Circuits time-division duplex (TDD) applications. A 3-wire serial Shutdown, Standby, Idle, Tx/Rx Disable interface controls power-management modes, the aux- Miniature 48-Pin Thin QFN Package DAC channels, and the aux-ADC channels. (7mm x 7mm x 0.8mm) The MAX19706 operates on a single +2.7V to +3.3V ana- Pin Configuration log supply and +1.8V to +3.3V digital I/O supply. The MAX19706 is specified for the extended (-40C to +85C) TOP VIEW temperature range and is available in a 48-pin, thin QFN package. The Selector Guide at the end of the data sheet 36 35 34 33 32 31 30 29 28 27 26 25 lists other pin-compatible versions in this AFE family. 24 Applications DAC2 37 D9 23 DAC1 38 D8 (SM) WiMAX and Wi-Bro CPEs V 39 22 D7 DD 21 802.11a/b/g WLAN IDN 40 D6 20 IDP 41 OV DD VoIP Terminals GND 42 19 OGND V 43 18 D5 Portable Communication Equipment DD MAX19706 17 D4 QDN 44 16 WiMAX is a service mark of Bandwidth.com, Inc. QDP 45 D3 EXPOSED PADDLE (GND) REFIN 46 15 D2 COM 14 D1 Ordering Information 47 13 D0 REFN 48 PART* PIN-PACKAGE PKG CODE 12 34 5 67 89 10 11 12 MAX19706ETM 48 Thin QFN-EP** T4877-4 MAX19706ETM+ 48 Thin QFN-EP** T4877-4 *All devices are specified over the -40C to +85C operating THIN QFN range. **EP = Exposed paddle. +Denotes lead-free package. Functional Diagram and Selector Guide appear 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 REFP DAC3 V ADC1 DD 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, 22Msps, 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 = 22MHz (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 = 22MHz, f = 2.2MHz on both 11.3 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 = 22MHz, f = 2.2MHz on both 16.5 20 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 = 22MHz, f = 5.5MHz on both 15.6 19 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 = 22MHz, f = 5.5MHz on both 13.1 CLK IN channels aux-DACs ON and at midscale, aux-ADC ON 2 MAX19706