MAX2055 19-2799 Rev 0 4/03 Digitally Controlled, Variable-Gain, Differential ADC Driver/Amplifier General Description Features The MAX2055 high-performance, digitally controlled, 30MHz to 300MHz Frequency Range variable-gain, differential analog-to-digital converter Single-Ended-to-Differential Conversion (ADC) driver/amplifier (DVGA) is designed for use from 30MHz to 300MHz in base station receivers. -3dB to +20dB Variable Gain The device integrates a digitally controlled attenuator 40dBm Output IP3 (at All Gain States and 70MHz) and a high-linearity single-ended-to-differential output amplifier, which can either eliminate an external trans- 2nd Harmonic -76dBc former, or can improve the even-order distortion perfor- 3rd Harmonic -69dBc mance of a transformer-coupled circuit, thus relaxing the requirements of the anti-alias filter preceding an Noise Figure: 5.8dB at Maximum Gain ADC. Targeted for ADC driver applications to adjust Digitally Controlled Gain with 1dB Resolution and gain either dynamically or as a one-time channel gain 0.2dB Accuracy setting, the MAX2055 is ideal for applications requiring high performance. The attenuator provides 23dB of Adjustable Bias Current attenuation range with 0.2dB accuracy. The MAX2055 is available in a thermally enhanced 20- pin TSSOP-EP package and operates over the -40C to Ordering Information +85C temperature range. PART TEMP RANGE PIN-PACKAGE Applications MAX2055EUP-T -40C to +85C 20 TSSOP-EP* Cellular Base Stations *EP = Exposed paddle. PHS/PAS Infrastructure Receiver Gain Control Broadband Systems Automatic Test Equipment Pin Configuration/ Terrestrial Links Functional Diagram High-Performance ADC Drivers TOP VIEW GND V 1 20 CC 19 ATTN RF IN 2 OUT 3 18 GND GND MAX2055 B4 4 17 I SET 5 C B3 16 C ATTENUATION B2 6 LOGIC 15 AMP IN CONTROL B1 7 14 L E B0 C 8 13 BP V I CC 9 12 BIAS RF OUT- RF OUT+ 10 11 TSSOP 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 AVAILABLEDigitally Controlled, Variable-Gain, Differential ADC Driver/Amplifier ABSOLUTE MAXIMUM RATINGS All Pins to GND....................................-0.3V to +(V + 0.25V) Operating Temperature Range ...........................-40C to +85C CC Input Signal (RF IN).............................20dBm Junction Temperature......................................................+150C Output Power (RF OUT)...................................................24dBm Storage Temperature Range .............................-65C to +165C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 20-Pin TSSOP (derate 21.7mW/C above +70C) ...........2.1W 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. DC ELECTRICAL CHARACTERISTICS (Circuit of Figure 1 V = +4.75V to +5.25V, GND = 0V. No input signals applied, and input and output ports are terminated with CC 50. R1 = 1.13k, T = -40C to +85C. Typical values are at V = +5V and T = +25C, unless otherwise noted.) (Notes 1, 2) A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY Supply Voltage V 4.75 5.0 5.25 V CC Supply Current I 240 290 mA CC I Current I 1.1 mA SET SET CONTROL INPUTS Control Bits Parallel 5 Bits Input Logic High 2V Input Logic Low 0.6 V Input Leakage Current -1.2 +1.2 A AC ELECTRICAL CHARACTERISTICS (Circuit of Figure 1 V = +4.75V to +5.25V, GND = 0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), R = 1.13k, P = 5dBm, CC 1 OUT f = 70MHz, 50 system impedance. Typical values are at V = +5V and T = +25C, unless otherwise noted.) (Notes 1, 2) IN CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Frequency Range f 30 300 MHz R Gain G 19.9 dB Amplitude Unbalance (Note 3) 0.06 dB Phase Unbalance (Note 3) 0.7 D egr ees Minimum Reverse Isolation 29 dB Noise Figure NF 5.8 dB Output 1dB Compression Point P 25.7 dBm 1dB f + f , f = 70MHz, f = 71MHz, 5dBm/tone 1 2 1 2 2nd-Order Output Intercept Point OIP2 75 dBm at RF OUT 3rd-Order Output Intercept Point OIP3 All gain conditions, 5dBm/tone at RF OUT 40 dBm 2nd Harmonic 2f -76 dBc IN 3rd Harmonic 3f -69 dBc IN RF Gain-Control Range 23 dB Gain-Control Resolution 1dB Attenuation Absolute Accuracy Compared to the ideal expected attenuation 0.2 dB +0.05/ Attenuation Relative Accuracy Between adjacent states dB -0.2 Gain Drift Over Temperature T = -40C to +85C 0.3 dB A 2 MAX2055