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PDF MAX2701 Data sheet ( Hoja de datos )
| Número de pieza | MAX2701 | |
| Descripción | 2.1 GHz to 2.5 GHz direct downconversion receiver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1667; Rev 0; 4/00
1.8GHzwww.DataSheet4U.com to 2.5GHz Direct Downconversion
Receivers
General Description
The MAX2700/MAX2701 are highly integrated direct
downconversion (zero-IF) receivers designed for wide-
band 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 down-
conversion stages and the use of an IF SAW filter. This
reduces the overall receiver cost by reducing the com-
ponent count and required board space.
The MAX2700/MAX2701 have three main blocks: low-
noise amplifier (LNA), quadrature downconverter, and
baseband variable gain amplifiers (VGAs). The LNA is
a single-ended amplifier with selectable gain and shut-
down options. It provides a high input third-order inter-
cept point (IP3), which reduces cross-modulation and
gain compression due to high-level RF interference.
The quadrature downconverter section consists of two
highly linear double-balanced mixers driven by an
external local oscillator (LO) with a selectable LO dou-
bler. The double-balanced mixers are optimized to pro-
vide high input IP3 and minimum added noise. The
mixers’ high input second-order intercept point (IIP2)
helps minimize receiver desensitization due to high-
level 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 per-
formance. An external lowpass filter between baseband
VGAs provides the required channel selectivity at the
adjacent channel. An integrated gain offset correction
loop circuit provides <0.3dB amplitude mismatch
between the I and Q channels.
The MAX2700/MAX2701 operate from a single +2.7V to
+3.3V power supply, drawing only 165mA of supply
current and 20µA in shutdown mode. Both devices are
available in small 48-pin TQFP packages with exposed
paddle (EP) for optimum high-frequency performance.
________________________Applications
Wireless Local Loop
Wideband Direct-Sequence Spread-Spectrum
Systems
Two-Way MMDS
Wideband 2.4GHz ISM Radios
Digital Microwave Radios
Features
o Input Frequency Range
1.8GHz to 2.1GHz (MAX2700)
2.1GHz to 2.5GHz (MAX2701)
o Cascaded Performance at 1960 MHz
3.5dB Noise Figure
-7.5dBm Input IP3 at Maximum Gain
o LNA with Selectable Gain and Shutdown Option
o High Linearity Direct I/Q Downconverter
o Wideband LO Quadrature Generator
o 3dB Baseband Channel Bandwidth of At Least
56MHz
o Variable Gain Baseband Amplifiers with >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
PART
MAX2700ECM
MAX2701ECM
Ordering Information
TEMP. RANGE
-40°C to 85°C
-40°C to 85°C
PIN-PACKAGE
48 TQFP-EP
48 TQFP-EP
TOP VIEW
Pin Configuration
CEXT-
CEXT+
VCC
X2_EN
GND
LNAIN
GND
GND
GAIN_SET
SHDN
AGC
VCC
1
2
3
4
5
6
7
8
9
10
11
12
MAX2700
MAX2701
36 IIN2-
35 DCI2+
34 DCI2-
33 IOUT2
32 GND
31 RFIN-
30 RFIN+
29 VCC
28 QOUT2
27 DCQ2-
26 DCQ2+
25 QIN2-
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.
1 page  
1.8GHzwww.DataSheet4U.com to 2.5GHz Direct Downconversion
Receivers
AC ELECTRICAL CHARACTERISTICS (continued)
(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 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+,
QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to
100Ω; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.)
PARAMETERS
CONDITIONS
MIN TYP MAX UNITS
Group Delay
tgd, RFIN to MIX_I/Q, frequency up to
-1dB baseband width
1.8 ns
Differential Group Delay
(Note 2)
∆tgd (between mixer I and Q channels)
1 ns
Output Impedance
Zout, MIX_I, MIX_Q, frequency up to -1dB baseband
width
1.4 Ω
Mixer Output Level
(Note 2)
MIX_I, MIX_Q, baseband output at -1dB compression
point
1.4 2.1
Vp-p
LO DOUBLER, LO BUFFER, QUADRATURE GENERATOR
LO Frequency Range
(Notes 1, 2)
LO Input Power (Note 7)
X2_EN = GND
X2_EN = VCC
X2_EN = VCC or GND
LO VSWR
MAX2700
MAX2701
Quadrature Error
∆φ , MIX_I to MIX_Q
BASEBAND STAGE 1 (IIN1 TO IOUT1, QIN1 TO QOUT1)
Channel Bandwidth
-1dB bandwidth (Note 2)
-3dB bandwidth
MAX2700
MAX2701
MAX2700
MAX2701
fLO = 900MHz to
1050MHz, X2_EN = GND
fLO = 1800MHz to
2100MHz, X2_EN = VCC
fLO = 1050MHz to
1250MHz, X2_EN = GND
fLO = 2100MHz to
2500MHz, X2_EN = VCC
Input Impedance
Input Impedance Mismatch
Voltage Gain (GV)
IIN1+, IIN1-, QIN1+, QIN1-, single-ended
Between IIN1+ and QIN1+
VAGC = 0.5V
VAGC = 2.0V
Voltage Gain Mismatch
Mismatch between IIN1 to IOUT1 and QIN1 to QOUT1,
0.5V < VAGC < 2 V
VGA1 Gain Slope
Guaranteed Monotonic over 0.5V <VAGC < 2V,
VAGC = 1.25V
Noise Figure
Phase Shift (Note 2)
ZS = 1.1kΩ (Note 8)
For 10dB of gain (with AGC)
VAGC = 2.0V
VAGC = 0.5V
900 1050
1050
1800
1250
2100
MHz
2100
2500
-16 -13 -10 dBm
2.0
1.8
−
1.7
2.0
1.5 4.5 degrees
14 26
56
1.9
4
-1.5 2.2
37 40
0.2
MHz
kΩ
Ω
6
dB
42
dB
34 dB/V
7.5
dB
34
0.5 0.9 degrees
_______________________________________________________________________________________ 5
5 Page 
1.8GHzwww.DataSheet4U.com to 2.5GHz Direct Downconversion
Receivers
Typical Operating Characteristics (continued)
(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 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+,
QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to
100Ω; input to VGAs, 20mVp-p at 1MHz tone, set VAGC = 1.25V, unless otherwise noted.)
MAX2700
MIXER BASEBAND BANDWIDTH vs. RL
160
140 3dB BANDWIDTH
120
100
80
60 1dB BANDWIDTH
40
20
0
0.50 0.75 1.00 1.25 1.50 1.75 2.00
RL (kΩ)
MIXER'S OUTPUT 1dB COMPRESSION
POINT vs. VCC vs. RL
2.6
2.4 RL = 1.05kΩ, 2.00kΩ
2.2
2.0 RL = 0.56kΩ
1.8
1.6
1.4
1.2
1.0
2.5 2.7 2.9 3.1 3.3 3.5
VCC (V)
ICC vs. VCC vs. TEMPERATURE
190
180
TA = +85°C
170
TA = +25°C
160
TA = -45°C
150
2.5 2.7 2.9 3.1 3.3 3.5
VCC (V)
MAX2701
LNA GAIN vs. FREQUENCY
vs. TEMPERATURE
20
19
18 TA = -45°C
17
16
15
TA = +25°C
14 TA = +85°C
13
12
11
HIGH-GAIN MODE
10
2100 2200 2300
2400
FREQUENCY (MHz)
2500
LNA GAIN vs. FREQUENCY
vs. TEMPERATURE
5
4
3
2
1
0 TA = +85°C TA = +25°C TA = -45°C
-1
-2
-3
-4
LOW-GAIN MODE
-5
2100 2200
2300
2400
FREQUENCY (MHz)
2500
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MAX2701.PDF ] | |
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