MAX2680EUT [MAXIM]

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers; 400MHz至2.5GHz的,低噪声, SiGe下变频混频器
MAX2680EUT
型号: MAX2680EUT
厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述:

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers
400MHz至2.5GHz的,低噪声, SiGe下变频混频器

射频和微波 射频上变频器 射频下变频器 微波上变频器 微波下变频器
文件: 总11页 (文件大小:187K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
19-4786; Rev 2; 8/03  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
General Description  
Features  
The MAX2680/MAX2681/MAX2682 miniature, low-cost,  
low-noise downconverter mixers are designed for low-  
voltage operation and are ideal for use in portable com-  
munications equipment. Signals at the RF input port are  
mixed with signals at the local oscillator (LO) port using a  
double-balanced mixer. These downconverter mixers  
operate with RF input frequencies between 400MHz and  
2500MHz, and downconvert to IF output frequencies  
between 10MHz and 500MHz.  
400MHz to 2.5GHz Operation  
+2.7V to +5.5V Single-Supply Operation  
Low Noise Figure: 6.3dB at 900MHz (MAX2680)  
High Input Third-Order Intercept Point  
(IIP3 at 2450MHz)  
-6.9dBm at 5.0mA (MAX2680)  
+1.0dBm at 8.7mA (MAX2681)  
+3.2dBm at 15.0mA (MAX2682)  
The MAX2680/MAX2681/MAX2682 operate from a sin-  
gle +2.7V to +5.5V supply, allowing them to be pow-  
ered directly from a 3-cell NiCd or a 1-cell Lithium  
battery. These devices offer a wide range of supply  
currents and input intercept (IIP3) levels to optimize  
system performance. Additionally, each device features  
a low-power shutdown mode in which it typically draws  
less than 0.1µA of supply current. Consult the Selector  
Guide for various combinations of IIP3 and supply cur-  
rent.  
<0.1µA Low-Power Shutdown Mode  
Ultra-Small Surface-Mount Packaging  
Ordering Information  
PIN-  
SOT  
PART  
TEMP RANGE  
PACKAGE TOP MARK  
The MAX2680/MAX2681/MAX2682 are manufactured  
on a high-frequency, low-noise, advanced silicon-ger-  
manium process and are offered in the space-saving  
6-pin SOT23 package.  
MAX2680EUT-T -40°C to +85°C 6 SOT23-6  
MAX2681EUT-T -40°C to +85°C 6 SOT23-6  
MAX2682EUT-T -40°C to +85°C 6 SOT23-6  
AAAR  
AAAS  
AAAT  
Pin Configuration  
Applications  
400MHz/900MHz/2.4GHz ISM-Band Radios  
Personal Communications Systems (PCS)  
Cellular and Cordless Phones  
TOP VIEW  
LO  
GND  
RFIN  
1
2
3
6
5
4
SHDN  
Wireless Local Loop  
MAX2680  
MAX2681  
MAX2682  
IEEE-802.11 and Wireless Data  
V
CC  
IFOUT  
SOT23-6  
Typical Operating Circuit appears at end of data sheet.  
Selector Guide  
FREQUENCY  
1950MHz  
900MHz  
2450MHz  
I
CC  
PART  
(mA)  
IIP3  
(dBm)  
NF  
(dB)  
GAIN  
(dB)  
IIP3  
(dBm)  
NF  
(dB)  
GAIN  
(dB)  
IIP3  
(dBm)  
NF  
(dB)  
GAIN  
(dB)  
MAX2680  
MAX2681  
MAX2682  
5.0  
8.7  
-12.9  
-6.1  
6.3  
7.0  
6.5  
11.6  
14.2  
14.7  
-8.2  
+0.5  
+4.4  
8.3  
7.6  
8.4  
-6.9  
+1.0  
+3.2  
11.7  
12.7  
13.4  
7.0  
7.7  
7.9  
11.1  
10.2  
15.0  
-1.8  
10.4  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
ABSOLUTE MAXIMUM RATINGS  
CC  
V
to GND ..........................................................-0.3V to +6.0V  
Continuous Power Dissipation (T = +70°C)  
A
RFIN Input Power (50Source).....................................+10dBm  
SOT23-6 (derate 8.7mW/°C above +70°C)..................696mW  
Operating Temperature Range ..........................-40°C to +85°C  
Junction Temperature......................................................+150°C  
Storage Temperature Range.............................-65°C to +160°C  
Lead Temperature (soldering, 10s) .................................+300°C  
LO Input Power (50Source)........................................+10dBm  
SHDN, IFOUT, RFIN to GND ......................-0.3V to (V  
+ 0.3V)  
+ 0.3V)  
CC  
CC  
LO to GND..........................................(V  
- 1V) to (V  
CC  
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.  
CAUTION! ESD SENSITIVE DEVICE  
DC ELECTRICAL CHARACTERISTICS  
(V  
= +2.7V to +5.5V, SHDN = +2V, T = T  
to T  
unless otherwise noted. Typical values are at V = +3V and T = +25°C.  
CC A  
CC  
A
MIN  
MAX  
Minimum and maximum values are guaranteed over temperature by design and characterization.)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
7.7  
UNITS  
MAX2680  
MAX2681  
MAX2682  
SHDN = 0.5V  
5.0  
8.7  
Operating Supply Current  
I
I
12.7  
21.8  
5
mA  
CC  
15.0  
0.05  
Shutdown Supply Current  
Shutdown Input Voltage High  
Shutdown Input Voltage Low  
Shutdown Input Bias Current  
µA  
V
CC  
V
IH  
2.0  
V
0.5  
V
IL  
SHDN  
I
0.2  
µA  
0 < SHDN < V  
CC  
AC ELECTRICAL CHARACTERISTICS  
(MAX2680/1/2 EV Kit, V  
= SHDN = +3.0V, T = +25°C, unless otherwise noted. RFIN and IFOUT matched to 50. P = -5dBm,  
CC  
A
LO  
P
= -25dBm.)  
RFIN  
PARAMETER  
MAX2680  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
RF Frequency Range  
LO Frequency Range  
IF Frequency Range  
(Notes 1, 2)  
(Notes 1, 2)  
(Notes 1, 2)  
400  
400  
10  
2500  
2500  
500  
MHz  
MHz  
MHz  
f
f
f
f
= 400MHz, f = 445MHz, f = 45MHz  
7.3  
11.6  
7.6  
RF  
RF  
RF  
RF  
LO  
IF  
= 900MHz, f = 970MHz, f = 70MHz  
LO  
IF  
Conversion Power Gain  
dB  
= 1950MHz, f = 1880MHz, f = 70MHz (Note 1)  
5.7  
8.6  
2.4  
LO  
IF  
= 2450MHz, f = 2210MHz, f = 240MHz  
7.0  
LO  
IF  
f
RF  
= 1950MHz, f = 1880MHz, f = 70MHz,  
LO IF  
Gain Variation Over Temperature  
1.9  
dB  
T
= T  
to T  
(Note 1)  
A
MIN  
MAX  
f
f
f
f
f
f
= 900MHz, 901MHz, f = 970MHz, f = 70MHz  
-12.9  
-8.2  
-6.9  
6.3  
RF  
RF  
RF  
RF  
RF  
RF  
LO  
IF  
Input Third-Order Intercept Point  
(Note 3)  
= 1950MHz, 1951MHz, f = 1880MHz, f = 70MHz  
dBm  
LO  
IF  
= 2450MHz, 2451MHz, f = 2210MHz, f = 240MHz  
LO  
IF  
= 900MHz, f = 970MHz, f = 70MHz  
LO  
IF  
Noise Figure (Single Sideband)  
= 1950MHz, f = 2020MHz, f = 70MHz  
8.3  
dB  
LO  
IF  
= 2450MHz, f = 2210MHz, f = 240MHz  
11.7  
1.5:1  
-22  
LO  
IF  
LO Input VSWR  
50source impedance  
= 1880MHz  
LO Leakage at IFOUT Port  
f
dBm  
LO  
2
_______________________________________________________________________________________  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
AC ELECTRICAL CHARACTERISTICS (continued)  
(MAX2680/1/2 EV Kit, V  
= SHDN = +3.0V, T = +25°C, unless otherwise noted. RFIN and IFOUT matched to 50. P = -5dBm,  
CC  
A
LO  
P
= -25dBm.)  
RFIN  
PARAMETER  
CONDITIONS  
MIN  
TYP  
-26  
MAX  
UNITS  
dBm  
LO Leakage at RFIN Port  
IF/2 Spurious Response  
MAX2681  
f
f
= 1880MHz  
LO  
= 1915MHz, f = 1880MHz, f = 70MHz (Note 4)  
-51  
dBm  
RF  
LO  
IF  
RF Frequency Range  
LO Frequency Range  
IF Frequency Range  
(Notes 1, 2)  
(Notes 1, 2)  
(Notes 1, 2)  
400  
400  
10  
2500  
2500  
500  
MHz  
MHz  
MHz  
f
f
f
f
= 400MHz, f = 445MHz, f = 45MHz  
11.0  
14.2  
8.4  
RF  
RF  
RF  
RF  
LO  
IF  
= 900MHz, f = 970MHz, f = 70MHz  
LO  
IF  
Conversion Power Gain  
dB  
= 1950MHz, f = 1880MHz, f = 70MHz (Note 1)  
6.7  
9.4  
2.3  
LO  
IF  
= 2450MHz, f = 2210MHz, f = 240MHz  
7.7  
LO  
IF  
f
RF  
= 1950MHz, f = 1880MHz, f = 70MHz,  
LO IF  
Gain Variation Over Temperature  
1.7  
dB  
T
= T  
to T  
(Note 1)  
A
MIN  
MAX  
f
f
f
f
f
f
= 900MHz, 901MHz, f = 970MHz, f = 70MHz  
-6.1  
+0.5  
+1.0  
7.0  
RF  
RF  
RF  
RF  
RF  
RF  
LO  
IF  
Input Third-Order Intercept Point  
(Note 3)  
= 1950MHz, 1951MHz, f = 1880MHz, f = 70MHz  
dBm  
LO  
IF  
= 2450MHz, 2451MHz, f = 2210MHz, f = 240MHz  
LO  
IF  
= 900MHz, f = 970MHz, f = 70MHz  
LO  
IF  
Noise Figure (Single Sideband)  
= 1950MHz, f = 2020MHz, f = 70MHz  
11.1  
12.7  
1.5:1  
-23  
dB  
LO  
IF  
= 2450MHz, f = 2210MHz, f = 240MHz  
LO  
IF  
LO Input VSWR  
50source impedance  
LO Leakage at IFOUT Port  
LO Leakage at RFIN Port  
IF/2 Spurious Response  
MAX2682  
f
f
f
= 1880MHz  
= 1880MHz  
dBm  
dBm  
dBm  
LO  
LO  
RF  
-27  
= 1915MHz, f = 1880MHz, f = 70MHz (Note 4)  
-65  
LO  
IF  
RF Frequency Range  
LO Frequency Range  
IF Frequency Range  
(Notes 1, 2)  
(Notes 1, 2)  
(Notes 1, 2)  
400  
400  
10  
2500  
2500  
500  
MHz  
MHz  
MHz  
f
f
f
f
= 400MHz, f = 445MHz, f = 45MHz  
13.4  
14.7  
10.4  
7.9  
RF  
RF  
RF  
RF  
LO  
IF  
= 900MHz, f = 970MHz, f = 70MHz  
LO  
IF  
Conversion Power Gain  
dB  
= 1950MHz, f = 1880MHz, f = 70MHz (Note 1)  
8.7  
11.7  
3.2  
LO  
IF  
= 2450MHz, f = 2210MHz, f = 240MHz  
LO  
IF  
f
RF  
= 1950MHz, f = 1880MHz, f = 70MHz,  
LO IF  
Gain Variation Over Temperature  
2.1  
dB  
T
= T  
to T  
(Note 1)  
A
MIN  
MAX  
f
RF  
f
RF  
f
RF  
f
RF  
f
RF  
f
RF  
= 900MHz, 901MHz, f = 970MHz, f = 70MHz  
-1.8  
+4.4  
+3.2  
6.5  
LO  
IF  
Input Third-Order Intercept Point  
(Note 3)  
= 1950MHz, 1951MHz, f = 1880MHz, f = 70MHz  
dBm  
LO  
IF  
= 2450MHz, 2451MHz, f = 2210MHz, f = 240MHz  
LO  
IF  
= 900MHz, f = 970MHz, f = 70MHz  
LO  
IF  
Noise Figure (Single Sideband)  
= 1950MHz, f = 2020MHz, f = 70MHz  
10.2  
13.4  
dB  
LO  
IF  
= 2450MHz, f = 2210MHz, f = 240MHz  
LO  
IF  
_______________________________________________________________________________________  
3
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
AC ELECTRICAL CHARACTERISTICS (continued)  
(MAX2680/1/2 EV Kit, V  
= SHDN = +3.0V, T = +25°C, unless otherwise noted. RFIN and IFOUT matched to 50. P = -5dBm,  
A LO  
CC  
P
RFIN  
= -25dBm.)  
PARAMETER  
LO Input VSWR  
CONDITIONS  
50source impedance  
MIN  
TYP  
1.5:1  
-23  
MAX  
UNITS  
LO Leakage at IFOUT Port  
LO Leakage at RFIN Port  
IF/2 Spurious Response  
f
f
f
= 1880MHz  
= 1880MHz  
dBm  
dBm  
dBm  
LO  
LO  
RF  
-27  
= 1915MHz, f = 1880MHz, f = 70MHz (Note 4)  
-61  
LO  
IF  
Note 1: Guaranteed by design and characterization.  
Note 2: Operation outside of this specification is possible, but performance is not characterized and is not guaranteed.  
Note 3: Two input tones at -25dBm per tone.  
Note 4: This spurious response is caused by a higher-order mixing product (2x2). Specified RF frequency is applied and IF output  
power is observed at the desired IF frequency (70MHz).  
Typical Operating Characteristics  
(Typical Operating Circuit, V  
= SHDN = +3.0V, P  
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)  
RFIN LO A  
CC  
MAX2680  
MAX2681  
MAX2682  
SUPPLY CURRENT vs. SUPPLY VOLTAGE  
SUPPLY CURRENT vs. SUPPLY VOLTAGE  
SUPPLY CURRENT vs. SUPPLY VOLTAGE  
18  
17  
16  
15  
14  
13  
12  
11  
10  
9
7
6
5
4
3
2
10  
9
SHDN = V  
CC  
SHDN = V  
CC  
SHDN = V  
CC  
T
= +85°C  
A
T
= +85°C  
A
T
= +85°C  
A
T
= +25°C  
= -40°C  
A
8
T
= +25°C  
A
T
= +25°C  
A
T
= -40°C  
A
T
= -40°C  
A
7
T
A
6
5
8
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
4
_______________________________________________________________________________________  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Typical Operating Characteristics (continued)  
(Typical Operating Circuit, V  
= SHDN = +3.0V, P  
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)  
RFIN LO A  
CC  
MAX2680  
SHUTDOWN SUPPLY  
CURRENT vs. SUPPLY VOLTAGE  
MAX2682  
SHUTDOWN SUPPLY  
CURRENT vs. SUPPLY VOLTAGE  
MAX2681  
SHUTDOWN SUPPLY  
CURRENT vs. SUPPLY VOLTAGE  
0.10  
0.09  
0.08  
0.07  
0.06  
0.05  
0.04  
0.03  
0.02  
0.01  
0
0.10  
0.09  
0.08  
0.07  
0.06  
0.05  
0.04  
0.03  
0.02  
0.01  
0
0.10  
SHDN = GND  
SHDN = GND  
SHDN = GND  
0.09  
0.08  
0.07  
0.06  
0.05  
0.04  
0.03  
0.02  
0.01  
0
T
= +85°C  
A
T = +85°C  
A
T
= +85°C  
A
T
= +25°C  
T
= +25°C  
A
T
= +25°C  
A
A
T
= -40°C  
A
T
= -40°C  
A
T
= -40°C  
A
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
MAX2681  
MAX2682  
MAX2680  
CONVERSION POWER GAIN vs. LO POWER  
CONVERSION POWER GAIN vs. LO POWER  
CONVERSION POWER GAIN vs. LO POWER  
16  
14  
16  
14  
15  
13  
f
RF  
= 900MHz  
f
= 900MHz  
f
RF  
= 900MHz  
RF  
12  
10  
8
12  
10  
8
11  
9
f
= 1950MHz  
RF  
f
= 1950MHz  
RF  
f
= 1950MHz  
f
= 2450MHz  
RF  
RF  
7
f
= 2450MHz  
f
RF  
f
RF  
= 2450MHz  
6
6
5
f
RF  
f
f
f
f
IF  
f
f
LO  
f
IF  
LO  
IF  
4
2
0
RF  
LO  
4
2
0
3
1
RF  
900MHz 970MHz 70MHz  
1950MHz 1880MHz 70MHz  
2450MHz 2210MHz 240MHz  
900MHz 970MHz 70MHz  
1950MHz 1880MHz 70MHz  
2450MHz 2210MHz 240MHz  
900MHz 970MHz 70MHz  
1950MHz  
1880MHz 70MHz  
2450MHz 2210MHz 240MHz  
-1  
-14 -12 -10  
-8  
-6  
-4  
-2  
0
-14 -12 -10  
-8  
-6  
-4  
-2  
0
-14 -12 -10  
-8 -6 -4 -2  
0
LO POWER (dBm)  
LO POWER (dBm)  
LO POWER (dBm)  
MAX2680  
MAX2681  
MAX2682  
CONVERSION POWER GAIN vs. TEMPERATURE  
CONVERSION POWER GAIN vs. TEMPERATURE  
CONVERSION POWER GAIN vs. TEMPERATURE  
16  
16  
17  
f
RF  
= 900MHz  
f
= 900MHz  
RF  
14  
14  
15  
f
RF  
= 900MHz  
12  
10  
8
12  
10  
8
13  
11  
9
f
= 1950MHz  
RF  
f
RF  
= 1950MHz  
f
RF  
= 1950MHz  
f
RF  
= 2450MHz  
f
RF  
= 2450MHz  
6
6
7
f
RF  
= 2450MHz  
f
f
f
IF  
RF  
LO  
4
2
0
4
2
0
5
3
1
900MHz 970MHz 70MHz  
1950MHz 1880MHz 70MHz  
2450MHz 2210MHz 240MHz  
60  
-40 -20  
0
20  
40  
60  
80 100  
-40 -20  
0
20  
40  
80 100  
-40 -20  
0
20  
40  
60  
80 100  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
_______________________________________________________________________________________  
5
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Typical Operating Characteristics (continued)  
(Typical Operating Circuit, V  
= SHDN = +3.0V, P  
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)  
RFIN LO A  
CC  
MAX2680  
INPUT IP3 vs. LO POWER  
MAX2681  
INPUT IP3 vs. LO POWER  
MAX2682  
INPUT IP3 vs. LO POWER  
-5  
2
7
f
f
f
= 1950MHz, 1951MHz  
= 1880MHz  
RF  
LO  
f
f
f
= 1950MHz, 1951MHz  
= 1880MHz  
RF  
LO  
6
5
4
3
2
1
0
-6  
-7  
1
0
= 70MHz  
IF  
P
= 70MHz  
IF  
P
= -25dBm PER TONE  
RFIN  
= -25dBm PER TONE  
RFIN  
-8  
-1  
-2  
-3  
f
f
f
= 1950MHz, 1951MHz  
= 1880MHz  
RF  
LO  
-9  
= 70MHz  
IF  
P
= -25dBm PER TONE  
RFIN  
-10  
-14 -12 -10  
-8  
-6  
-4  
-2  
0
-14 -12 -10  
-8  
-6  
-4  
-2  
0
-14 -12 -10  
-8  
-6  
-4  
-2  
0
LO POWER (dBm)  
LO POWER (dBm)  
LO POWER (dBm)  
MAX2680  
NOISE FIGURE vs. LO POWER  
MAX2682  
NOISE FIGURE vs. LO POWER  
MAX2681  
NOISE FIGURE vs. LO POWER  
16  
14  
25  
20  
f
f
f
IF  
RF  
LO  
18  
16  
14  
12  
10  
8
900MHz 970MHz 70MHz  
1950MHz  
f
= 2450MHz  
= 1950MHz  
2020MHz 70MHz  
2450MHz 2210MHz 70MHz  
20  
15  
10  
5
RF  
12  
10  
8
f
f
= 2450MHz  
= 1950MHz  
RF  
f
RF  
RF  
f
= 2450MHz  
= 1950MHz  
RF  
f
= 900MHz  
f
RF  
RF  
f
= 900MHz  
6
RF  
6
f
= 900MHz  
RF  
f
f
f
IF  
RF  
LO  
f
f
f
IF  
4
RF  
LO  
900MHz 970MHz 70MHz  
1950MHz 2020MHz 70MHz  
2450MHz 2210MHz 70MHz  
4
900MHz 970MHz 70MHz  
1950MHz 2020MHz 70MHz  
2450MHz 2210MHz 70MHz  
2
2
0
0
0
-14 -12 -10  
-8  
-6  
-4  
-2  
0
-14 -12 -10  
-8  
-6  
-4  
-2  
0
-14 -12 -10  
-8  
-6  
-4  
-2  
0
0
LO POWER (dBm)  
LO POWER (dBm)  
LO POWER (dBm)  
MAX2680  
MAX2681  
MAX2682  
RF PORT IMPEDANCE vs. RF FREQUENCY  
RF PORT IMPEDANCE vs. RF FREQUENCY  
RF PORT IMPEDANCE vs. RF FREQUENCY  
MAX2680/1/2-19  
MAX2680/1/2-20  
MAX2680/1/2-21  
0
300  
300  
0
300  
IMAGINARY  
IMAGINARY  
IMAGINARY  
-100  
-200  
-300  
-400  
-500  
-600  
-100  
-200  
-300  
-400  
-500  
-600  
250  
200  
150  
100  
50  
250  
200  
150  
100  
50  
-100  
-200  
-300  
-400  
-500  
-600  
250  
200  
150  
100  
50  
REAL  
REAL  
REAL  
f
= 970MHz  
= -5dBm  
f
= 970MHz  
= -5dBm  
LO  
f
= 970MHz  
LO  
LO  
P
P
LO  
= -5dBm  
0
0
0
0
500  
1000  
1500  
2000  
2500  
0
500  
1000  
1500  
2000  
2500  
0
500  
1000  
1500  
2000  
2500  
RF FREQUENCY (MHz)  
RF FREQUENCY (MHz)  
RF FREQUENCY (MHz)  
6
_______________________________________________________________________________________  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Typical Operating Characteristics (continued)  
(Typical Operating Circuit, V  
= SHDN = +3.0V, P  
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)  
RFIN LO A  
CC  
MAX2680  
MAX2681  
IF PORT IMPEDANCE vs. IF FREQUENCY  
MAX2682  
IF PORT IMPEDANCE vs. IF FREQUENCY  
IF PORT IMPEDANCE vs. IF FREQUENCY  
MAX2680/1/2-22  
MAX2680/1/2-23  
MAX2680/1/2-24  
0
0
1200  
1200  
0
800  
f
= 970MHz  
= -5dBm  
f
= 970MHz  
= -5dBm  
LO  
LO  
f
= 970MHz  
= -5dBm  
LO  
P
P
LO  
P
LO  
-50  
700  
600  
LO  
-100  
-200  
-300  
-400  
-500  
-600  
-100  
-200  
-300  
-400  
-500  
-600  
1000  
800  
600  
400  
200  
0
1000  
800  
600  
400  
200  
0
-100  
-150  
IMAGINARY  
IMAGINARY  
500  
400  
IMAGINARY  
-200  
-250  
-300  
-350  
-400  
300  
200  
REAL  
REAL  
REAL  
100  
0
0
100  
200  
0
200  
300  
400  
500  
0
100  
200  
300  
400  
500  
0
100  
200  
300  
400  
500  
IF FREQUENCY (MHz)  
IF FREQUENCY (MHz)  
IF FREQUENCY (MHz)  
MAX2681  
LO PORT RETURN LOSS  
MAX2680  
LO PORT RETURN LOSS  
MAX2682  
LO PORT RETURN LOSS  
+10  
+10  
+5  
+10  
+5  
+5  
0
0
0
-5  
-5  
-5  
-10  
-15  
-20  
-25  
-30  
-35  
-40  
-10  
-15  
-20  
-25  
-30  
-35  
-40  
-10  
-15  
-20  
-25  
-30  
-35  
-40  
200  
760  
1320  
1880  
2440  
3000  
760  
1320  
1880  
2440  
3000  
200  
760  
1320  
1880  
2440  
3000  
FREQUENCY (MHz)  
FREQUENCY (MHz)  
FREQUENCY (MHz)  
MAX2680  
LO-to-IF AND LO-to-RF ISOLATION  
MAX2682  
LO-to-IF AND LO-to-RF ISOLATION  
MAX2681  
LO-to-IF AND LO-to-RF ISOLATION  
35  
30  
25  
20  
15  
10  
5
35  
30  
40  
35  
30  
25  
LO-to-IF ISOLATION  
LO-to-IF ISOLATION  
LO-to-IF ISOLATION  
25  
20  
15  
10  
LO-to-RF ISOLATION  
LO-to-RF ISOLATION  
20  
15  
LO-to-RF ISOLATION  
10  
5
0
0
500  
1000  
1500  
2000  
2500  
0
500  
1000  
1500  
2000  
2500  
0
500  
1000  
1500  
2000  
2500  
LO FREQUENCY (MHz)  
LO FREQUENCY (MHz)  
LO FREQUENCY (MHz)  
_______________________________________________________________________________________  
7
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Typical Operating Characteristics (continued)  
(Typical Operating Circuit, V  
= SHDN = +3.0V, P  
= -25dBm, P = -5dBm, T = +25°C, unless otherwise noted.)  
RFIN LO A  
CC  
MAX2682  
TURN-OFF/ON CHARACTERISTICS  
MAX2680  
TURN-OFF/ON CHARACTERISTICS  
MAX2681  
TURN-OFF/ON CHARACTERISTICS  
SHDN  
2V/div  
SHDN  
2V/div  
SHDN  
2V/div  
IFOUT  
50mV/  
div  
IFOUT  
50mV/  
div  
IFOUT  
50mV/  
div  
Z1 = 39pF  
500ns/div  
Z1 = 39pF  
500ns/div  
Z2 = 39pF  
500ns/div  
Pin Description  
PIN  
NAME  
FUNCTION  
Local-Oscillator Input. Apply a local-oscillator signal with an amplitude of -10dBm to 0 (50source). AC-  
1
2
3
LO  
couple this pin to the oscillator with a DC-blocking capacitor. Nominal DC voltage is V  
- 0.4V.  
CC  
GND  
RFIN  
Mixer Ground. Connect to the ground plane with a low-inductance connection.  
Radio Frequency Input. AC-couple to this pin with a DC-blocking capacitor. Nominal DC voltage is 1.5V.  
See Applications Information section for details on impedance matching.  
Intermediate Frequency Output. Open-collector output requires an inductor to V . AC-couple to this pin  
CC  
with a DC-blocking capacitor. See Applications Information section for details on impedance matching.  
4
5
6
IFOUT  
Supply Voltage Input, +2.7V to +5.5V. Bypass with a capacitor to the ground plane. Capacitor value  
depends upon desired operating frequency.  
V
CC  
Active-Low Shutdown. Drive low to disable all device functions and reduce the supply current to less than  
SHDN  
5µA. For normal operation, drive high or connect to V  
.
CC  
8
_______________________________________________________________________________________  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
IF Output  
Detailed Description  
The IF output frequency range extends from 10MHz to  
500MHz. IFOUT is a high-impedance, open-collector  
The MAX2680/MAX2681/MAX2682 are 400MHz to  
2.5GHz, silicon-germanium, double-balanced down-  
converter mixers. They are designed to provide opti-  
mum linearity performance for a specified supply  
current. They consist of a double-balanced Gilbert-cell  
mixer with single-ended RF, LO, and IF port connec-  
tions. An on-chip bias cell provides a low-power shut-  
down feature. Consult the Selector Guide for device  
features and comparison.  
output that requires an external inductor to V  
for  
CC  
proper biasing. For optimum performance, the IF port  
requires an impedance-matching network. The configu-  
ration and values for the matching network is depen-  
dent upon the frequency and desired output  
impedance. For assistance in choosing components for  
optimal performance, refer to Tables 3 and 4 as well as  
the IF Port Impedance vs. IF Frequency graph in the  
Typical Operating Characteristics.  
Applications Information  
SHDN  
Power-Supply and  
Proper attention to voltage supply bypassing is essen-  
tial for high-frequency RF circuit stability. Bypass V  
Bypassing  
Local-Oscillator (LO) Input  
The LO input is a single-ended broadband port with a  
typical input VSWR of better than 2.0:1 from 400MHz to  
2.5GHz. The LO signal is mixed with the RF input sig-  
nal, and the resulting downconverted output appears at  
IFOUT. AC-couple LO with a capacitor. Drive the LO  
port with a signal ranging from -10dBm to 0 (50  
source).  
CC  
with a 10µF capacitor in parallel with a 1000pF capaci-  
tor. Use separate vias to the ground plane for each of  
the bypass capacitors and minimize trace length to  
reduce inductance. Use separate vias to the ground  
plane for each ground pin. Use low-inductance ground  
connections.  
RF Input  
The RF input frequency range is 400MHz to 2.5GHz.  
The RF input requires an impedance-matching network  
as well as a DC-blocking capacitor that can be part of  
the matching network. Consult Tables 1 and 2, as well  
as the RF Port Impedance vs. RF Frequency graph in  
the Typical Operating Characteristics for information on  
matching.  
Decouple SHDN with a 1000pF capacitor to ground to  
minimize noise on the internal bias cell. Use a series  
resistor (typically 100) to reduce coupling of high-fre-  
quency signals into the SHDN pin.  
Layout Issues  
A well designed PC board is an essential part of an RF  
circuit. For best performance, pay attention to power-  
supply issues as well as to the layout of the RFIN and  
IFOUT impedance-matching network.  
Table 1. RFIN Port Impedance  
FREQUENCY  
PART  
400MHz  
179-j356  
209-j332  
206-j306  
900MHz  
54-j179  
75-j188  
78-j182  
1950MHz  
2450MHz  
33-j73  
MAX2680  
MAX2681  
MAX2682  
32-j94  
34-j108  
34-j106  
33-j86  
29-j86  
Table 2. RF Input Impedance-Matching Component Values  
FREQUENCY  
MAX2680  
MAX2681  
MAX2682  
MATCHING  
COMPONENTS  
400  
MHz  
900  
MHz  
1950  
MHz  
2450  
MHz  
400  
MHz  
900  
1950  
MHz  
2450  
MHz  
400  
MHz  
900  
1950  
MHz  
2450  
MHz  
MHz  
270pF  
18nH  
Open  
MHz  
1.5pF  
270pF  
10nH  
Z1  
Z2  
Z3  
86nH  
270pF  
Open  
270pF 1.5pF  
Short  
68nH  
1.5pF  
Short  
68nH  
Short  
Short  
22nH  
Open  
270pF 270pF 270pF  
1.8nH 1.8nH 0.5pF  
270pF 270pF 270pF  
1.8nH 2.2nH 0.5pF  
270pF 270pF  
2.2nH 1.2nH  
Note: Z1, Z2, and Z3 are found in the Typical Operating Circuit.  
_______________________________________________________________________________________  
9
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Power-Supply Layout  
Table 3. IFOUT Port Impedance  
To minimize coupling between different sections of the  
IC, the ideal power-supply layout is a star configuration  
FREQUENCY  
PART  
with a large decoupling capacitor at a central V  
CC  
45MHz  
960-j372  
934-j373  
670-j216  
70MHz  
240MHz  
186-j397  
161-j375  
175-j296  
node. The V  
traces branch out from this central  
CC  
node, each going to a separate V node on the PC  
MAX2680  
MAX2681  
MAX2682  
803-j785  
746-j526  
578-j299  
CC  
board. At the end of each trace is a bypass capacitor  
that has low ESR at the RF frequency of operation. This  
arrangement provides local decoupling at the V  
pin.  
CC  
At high frequencies, any signal leaking out of one sup-  
ply pin sees a relatively high impedance (formed by the  
V
CC  
trace inductance) to the central V  
node, and an  
CC  
Table 4. IF Output Impedance-Matching  
Components  
even higher impedance to any other supply pin, as well  
as a low impedance to ground through the bypass  
capacitor.  
FREQUENCY  
MATCHING  
Impedance-Matching Network Layout  
The RFIN and IFOUT impedance-matching networks are  
very sensitive to layout-related parasitics. To minimize  
parasitic inductance, keep all traces short and place  
components as close as possible to the chip. To mini-  
mize parasitic capacitance, use cutouts in the ground  
plane (and any other plane) below the matching network  
components. However, avoid cutouts that are larger  
than necessary since they act as aperture antennas.  
COMPONENT  
45MHz  
390nH  
39pF  
70MHz  
330nH  
15pF  
240MHz  
82nH  
3pF  
L1  
C2  
R1  
250Ω  
Open  
Open  
Typical Operating Circuit  
C1  
LO  
INPUT  
1
2
6
SHUTDOWN  
CONTROL  
SHDN  
LO  
C3  
MAX2680  
MAX2681  
MAX2682  
5
4
V
CC  
V
CC  
GND  
+2.7V TO +5.5V  
C4  
1000pF  
C5  
10µF  
R1  
L1  
Z
2
Z
1
RF  
INPUT  
IF  
OUTPUT  
3
RFIN  
IFOUT  
C2  
Z
3
THE VALUES OF MATCHING COMPONENTS C2, L1, R1, Z1, Z2, AND Z3 DEPEND ON THE IF AND RF FREQUENCY AND DOWNCONVERTER. SEE TABLES 2 AND 4.  
10 ______________________________________________________________________________________  
400MHz to 2.5GHz, Low-Noise,  
SiGe Downconverter Mixers  
Package Information  
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information  
go to www.maxim-ic.com/packages.)  
PACKAGE OUTLINE, SOT-23, 6L  
1
21-0058  
F
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are  
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.  
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11  
© 2003 Maxim Integrated Products  
Printed USA  
is a registered trademark of Maxim Integrated Products.  

相关型号:

MAX2680EUT+

Down Converter, SOT-23, 6 PIN
MAXIM

MAX2680EUT-T

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers
MAXIM

MAX2680EVKIT

Easy Evaluation of All Device Functions
MAXIM

MAX2680_03

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers
MAXIM

MAX2681

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers
MAXIM

MAX2681EUT

Down Converter, SOT-23, 6 PIN
MAXIM

MAX2681EUT+T

Down Converter, BIPolar, SOT-23, 6 PIN
MAXIM

MAX2681EUT-T

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers
MAXIM

MAX2681EVKIT

Easy Evaluation of All Device Functions
MAXIM

MAX2682

400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers
MAXIM

MAX2682EUT

PLASTIC ENCAPSULATED DEVICES
ETC

MAX2682EUT+

Down Converter, BIPolar, SOT-23, 6 PIN
MAXIM