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Part: MAX2700ECM
Category:
Communication
-> Wireless
Description: MAX2700, MAX2701 1.8GHz to 2.5GHz, Direct-downconversion Receivers
Company: Maxim Integrated Products
Datasheet: Download MAX2700ECM datasheet File size : 514 kB
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Datasheet text preview:
19-1667; Rev 0; 4/00
1.8GHz to 2.5GHz Direct Downconversion Receivers
General Description
The MAX2700/MAX2701 are highly integrated direct downconversion (zero-IF) receivers designed for wideband wireless local loop (WLL) systems operating in the 1.8GHz to 2.5GHz band. The MAX2700/MAX2701s' zero-IF architecture eliminates the need for IF downconversion stages and the use of an IF SAW filter. This reduces the overall receiver cost by reducing the component count and required board space. The MAX2700/MAX2701 have three main blocks: lownoise amplifier (LNA), quadrature downconverter, and baseband variable gain amplifiers (VGAs). The LNA is a single-ended amplifier with selectable gain and shutdown options. It provides a high input third-order intercept point (IP3), which reduces cross-modulation and gain compression due to high-level RF interference. The quadrature downconverter section consists of two h i g h l y linear double-balanced mixers driven by an external local oscillator (LO) with a selectable LO doubler. The double-balanced mixers are optimized to provide high input IP3 and minimum added noise. The mixers' high input second-order intercept point (IIP2) helps minimize receiver desensitization due to highlevel AM-modulated interferers. The two baseband VGAs in each channel provide 80dB of total maximum gain and greater than 60dB of gain control. The first AGC amplifier is optimized for low noise, low power dissipation, and high linearity over the entire gain range to ensure high gain compression performance. An external lowpass filter between baseband VGAs provides the required channel selectivity at the adjacent channel. An integrated gain offset correction l o o p circuit provides 60dB Control Range o Baseband Gain Offset Correction Loop o +2.7V to +3.3V Single-Supply Operation o Small 48-pin TQFP-EP Package
Features
MAX2700/MAX2701
Ordering Information
PART MAX2700ECM MAX2701ECM TEMP. RANGE -40°C to 85°C -40°C to 85°C PIN-PACKAGE 48 TQFP-EP 48 TQFP-EP
Pin Configuration
TOP VIEW DCI1+ DCI1IOUT1
40 39
MIX_I GND
IIN1+
48
47
46
45
44
43
42
41
38
37
IIN2+
IIN1-
GND
VCC LO
VCC
CEXTCEXT+ VCC X2_EN GND LNAIN GND GND GAIN_SET SHDN AGC VCC
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
36 35 34 33 32 31 30 29 28 27 26 25
IIN2DCI2+ DCI2IOUT2 GND RFINRFIN+ VCC QOUT2 DCQ2DCQ2+ QIN2-
________________________Applications
Wireless Local Loop Wideband Direct-Sequence Spread-Spectrum Systems Two-Way MMDS Wideband 2.4GHz ISM Radios Digital Microwave Radios
MAX2700 MAX2701
QIN1-
LNAOUT
DCQ1+ DCQ1-
QIN1+
QOUT1
TQFP-EP ________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MIXTNK
GND MIX_Q
QIN2+
GND
VCC
1.8GHz to 2.5GHz Direct Downconversion Receivers MAX2700/MAX2701
ABSOLUTE MAXIMUM RATINGS
VCC to GND .....-0.3V to +6V RF Signals PRFIN, PLNAIN, PLO .....+15dBm Baseband Signals IIN1+ to IIN1-, IIN2+ to IIN2-, QIN1+ to QIN1-, QIN2+ to QIN2- .....±2V Input Voltages AGC, GAIN_SET, SHDN, X2_EN, CEXT_, RFIN_, LO, LNAIN, IIN_ _, QIN_ _ , DCI_ _ , DCQ_ _ to GND ..........-0.3V to (VCC + 0.3V) Input Current AGC.....±50mA All Digital Inputs.....±10mA Continuous Power Dissipation (TA = +70°C) 48-Pin TQFP-EP (derate 27mW/°C above +70°C) .....2000mW Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +150°C Junction Temperature ......+150°C Lead Temperature (soldering, 10s) .........+300°C
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
(MAX2700/MAX2701 EV kit (Figure 3), VCC = +2.7V to +3.3V, SHDN = GAIN_SET = VCC, X2_EN = GND, VAGC = 1.25V, CEXT+ connected to CEXT-; no RF input signals applied; RFIN, LNAIN, LO inputs are terminated with 50, LNAOUT connected to VCC through a 10nH inductor; MIX_I, MIX_Q, QIN1+, QIN1-, QOUT1, IIN1+, IIN1-, IOUT1, QIN2+, QIN2-, QOUT2, IIN2+, IIN2-, IOUT2 pins are unconnected; TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25°C.)
PARAMETERS SUPPLY Supply Voltage LNA enabled TA = +25°C Operating Supply Current LNA enabled TA = -40°C to +85°C LNA disabled LNA disabled MAX2700 MAX2701 MAX2700 MAX2701 MAX2700 MAX2701 MAX2700 MAX2701 20 2 0.6 SHDN, X2_EN, GAIN_SET Input Bias Current AGC, +0.5 < VAGC < +2.0V AGC, VAGC = 0.5V, SHDN = GND MIX_I, MIX_Q DC Output Voltage IOUT1, QOUT1 IOUT2, QOUT2 -1 -22 -2 1.2 1.1 1.25 V 0.5 12 2 µA 2.7 165 167 155 156 3.3 215 220 200 205 230 235 210 215 100 µA V V mA V CONDITIONS MIN TYP MAX UNITS
Shutdown Supply Current CONTROL INPUTS/OUTPUTS Input Logic Voltage High Input Logic Voltage Low
SHDN = GND, VAGC = 0.5V
2
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1.8GHz to 2.5GHz Direct Downconversion Receivers
AC ELECTRICAL CHARACTERISTICS
(MAX2700/MAX2701 EV kit (Figure 3), VCC = +3.0V, TA = +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, PLO = -13dBm, FLO = 980MHz (MAX2700) and 1200MHz (MAX2701), PLNAIN = -30dBm, PRFIN = -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50 source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2k load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1k AC-coupled source; IOUT1, QOUT1 AC-coupled to 2k; IOUT2, QOUT2 AC-coupled to 100; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.)
PARAMETERS LNA STAGE Operating Frequency Range (Note 1) MAX2700 MAX2701 MAX2700, fLNAIN = 1960MHz TA = -40°C to 85°C Power Gain (Note 2) MAX2701, fLNAIN = 2400MHz TA = -40°C to 85°C MAX2700, fLNAIN = 1960MHz MAX2701, fLNAIN = 2400MHz Input Third-Order Intercept (Note 3) Reverse Isolation Isolation MAX2700, fLNAIN = 1960MHz MAX2701, fLNAIN = 2400MHz GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND GAIN_SET = VCC GAIN_SET = GND 1800 2100 13.5 -7.5 13 -8 13 -6 12.5 -6.5 2.0 15.8 2.3 16.7 +2.7 +5.1 +3.8 +4.3 28 30 44 1.1 1.8 1.3 2.1 1.7 1.6 1.2 1.4 1800 2100 16 14.5 19.3 18.1 11.0 12.8 2100 2500 21.5 20 - dB dB dBm dB 16.5 -1.8 17.1 -1.9 2100 2500 19.5 2 20 2.5 18.5 0.5 19 1.0 dB MHz CONDITIONS MIN TYP MAX UNITS
MAX2700/MAX2701
Noise Figure
1800MHz to 2500MHz, GAIN_SET = VCC or GND LNAIN to LO, fLNAIN = 1800MHz to 2500MHz LNAOUT to RFIN, fLNAIN = 1800 MHz to 2500 MHz MAX2700 GAIN_SET = VCC At LNA input, with external matching circuit at LNAIN GAIN_SET = GND MAX2701 GAIN_SET = VCC GAIN_SET = GND MAX2700 GAIN_SET = VCC At LNA output, with external matching circuit at LNAOUT GAIN_SET = GND MAX2701 GAIN_SET = VCC GAIN_SET = GND
VSWR
M IXER STAGE (Differential RF input to mixer I/Q outputs with external balun and matching circuit to 50) Frequency Range (Notes 1, 2) Voltage Gain DSB Noise Figure MAX2700 MAX2701 MAX2700, fRFIN = 1960 MHz MAX2701, fRFIN = 2400 MHz MAX2700, fRFIN = 1960MHz MAX2701, fRFIN = 2400MHz MHz dB dB
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