MAX2681EUT+T [MAXIM]
Down Converter, BIPolar, SOT-23, 6 PIN;
| 型号： | MAX2681EUT+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Down Converter, BIPolar, SOT-23, 6 PIN 射频 微波 |
| 文件： | 总12页 (文件大小：2070K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX2680/MAX2681/
MAX2682
400MHz to 2.5GHz, Low-Noise,
SiGe Downconverter Mixers
General Description
Features
● 400MHz to 2.5GHz Operation
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.
● +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)
● < 0.1μA Low-Power Shutdown Mode
The MAX2680/MAX2681/MAX2682 operate from a single
+2.7V to +5.5V supply, allowing them to be powered
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 perfor-
mance. 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 current.
● Ultra-Small Surface-Mount Packaging
The MAX2680/MAX2681/MAX2682 are manufactured on
a high-frequency, low-noise, advanced silicon-germanium
process and are offered in the space-saving 6-pin SOT23
package.
Ordering Information
Applications
PIN-
SOT
● 400MHz/900MHz/2.4GHz ISM-Band Radios
● Personal Communications Systems (PCS)
● Cellular and Cordless Phones
● Wireless Local Loop
● IEEE-802.11 and Wireless Data
PART
TEMP RANGE
PACKAGE TOP MARK
MAX2680EUT-T -40°C to +85°C
MAX2681EUT-T -40°C to +85°C
MAX2682EUT-T -40°C to +85°C
6 SOT23
6 SOT23
6 SOT23
AAAR
AAAS
AAAT
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
11.1
10.2
7.6
8.4
-6.9
+1.0
+3.2
11.7
12.7
13.4
7.0
7.7
7.9
15.0
-1.8
10.4
Typical Operating Circuit appears at end of data sheet.
19-4786; Rev 2; 8/03
MAX2680/MAX2681/
MAX2682
400MHz to 2.5GHz, Low-Noise,
SiGe Downconverter Mixers
Absolute Maximum Ratings
V
to GND .........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
SOT23 (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
CC
A
RFIN Input Power (50Ω source).....................................+10dBm
LO Input Power (50Ω source) ........................................+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
MIN
MAX
CC A
Minimum and maximum values are guaranteed over temperature by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
5.0
MAX
7.7
UNITS
MAX2680
MAX2681
MAX2682
SHDN = 0.5V
Operating Supply Current
I
I
8.7
12.7
21.8
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
2.0
IH
V
0.5
V
IL
SHDN
I
0 < SHDN < V
0.2
μA
CC
AC Electrical Characteristics
(MAX2680/1/2 EV Kit, V
= SHDN = +3.0V, T = +25°C, unless otherwise noted. RFIN and IFOUT matched to 50Ω. 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
f
= 400MHz, f = 445MHz, f = 45MHz
7.3
11.6
7.6
RF
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
= 1950MHz, f = 1880MHz, f = 70MHz,
LO
IF
Gain Variation Over Temperature
1.9
dB
T
= T
to T
(Note 1)
MAX
A
MIN
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
50Ω source impedance
= 1880MHz
LO Leakage at IFOUT Port
f
dBm
LO
Maxim Integrated
│ 2
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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 50Ω. 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
RF
= 1915MHz, f = 1880MHz, f = 70MHz (Note 4)
-51
dBm
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
f
= 400MHz, f = 445MHz, f = 45MHz
11.0
14.2
8.4
RF
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
= 1950MHz, f = 1880MHz, f = 70MHz,
LO
IF
Gain Variation Over Temperature
1.7
dB
T
= T
to T
(Note 1)
MAX
A
MIN
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
50Ω source 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
f
= 400MHz, f = 445MHz, f = 45MHz
13.4
14.7
10.4
7.9
RF
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
= 1950MHz, f = 1880MHz, f = 70MHz,
LO
IF
Gain Variation Over Temperature
2.1
dB
T
= T
to T
(Note 1)
MAX
A
MIN
f
f
f
f
f
f
= 900MHz, 901MHz, f = 970MHz, f = 70MHz
-1.8
+4.4
+3.2
6.5
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
10.2
13.4
dB
LO
IF
= 2450MHz, f = 2210MHz, f = 240MHz
LO
IF
Maxim Integrated
│ 3
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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 50Ω. P = -5dBm,
CC
A
LO
P
= -25dBm.)
RFIN
PARAMETER
LO Input VSWR
CONDITIONS
50Ω source 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.)
CC
RFIN LO A
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
SHDN = V
CC
CC
SHDN = V
CC
T
= +85°C
A
T
A
= +85°C
T
A
= +85°C
T
= +25°C
= -40°C
A
8
T
A
= +25°C
T = +25°C
A
T
A
= -40°C
T
A
= -40°C
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)
Maxim Integrated
│
4
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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.)
CC
RFIN LO A
MAX2680
MAX2681
MAX2682
SHUTDOWN SUPPLY
SHUTDOWN SUPPLY
SHUTDOWN SUPPLY
CURRENT vs. SUPPLY VOLTAGE
CURRENT vs. SUPPLY VOLTAGE
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
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
SHDN = GND
SHDN = GND
SHDN = GND
T
A
= +85°C
T
= +85°C
= -40°C
A
T
A
= +85°C
T = +25°C
A
T
A
= +25°C
T = +25°C
A
T
= -40°C
T
A
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)
MAX2680
MAX2681
MAX2682
CONVERSION POWER GAIN vs. LO POWER
15
CONVERSION POWER GAIN vs. LO POWER
16
CONVERSION POWER GAIN vs. LO POWER
16
f
RF
= 900MHz
f
= 900MHz
f
= 900MHz
RF
13
RF
14
14
11
9
12
10
8
12
10
8
f
= 1950MHz
= 2450MHz
RF
f
= 1950MHz
RF
f
= 1950MHz
f
= 2450MHz
RF
RF
7
f
RF
f
= 2450MHz
RF
5
6
6
f
f
f
f
f
f
IF
f
f
f
IF
RF
LO
IF
3
1
4
2
0
RF
LO
4
2
0
RF
LO
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
16
CONVERSION POWER GAIN vs. TEMPERATURE
16
CONVERSION POWER GAIN vs. TEMPERATURE
17
f
= 900MHz
RF
f
= 900MHz
RF
14
14
15
f
= 900MHz
RF
12
10
8
12
10
8
13
11
9
f
= 1950MHz
RF
f
= 1950MHz
RF
f
RF
= 1950MHz
f
= 2450MHz
RF
f
RF
= 2450MHz
6
6
7
f
= 2450MHz
RF
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)
Maxim Integrated
│ 5
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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.)
CC
RFIN
LO
A
MAX2680
MAX2681
MAX2682
INPUT IP3 vs. LO POWER
INPUT IP3 vs. LO POWER
INPUT IP3 vs. LO POWER
-5
2
7
f
f
f
= 1950MHz, 1951MHz
= 1880MHz
= 70MHz
RF
LO
f
f
f
= 1950MHz, 1951MHz
= 1880MHz
= 70MHz
RF
6
5
4
3
2
1
0
LO
-6
-7
1
0
IF
IF
P
= -25dBm PER TONE
RFIN
P
= -25dBm PER TONE
RFIN
-8
-1
-2
-3
f
f
f
= 1950MHz, 1951MHz
= 1880MHz
= 70MHz
RF
LO
-9
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
MAX2681
MAX2682
NOISE FIGURE vs. LO POWER
NOISE FIGURE vs. LO POWER
NOISE FIGURE vs. LO POWER
16
14
20
25
f
f
f
IF
RF
LO
18
16
14
12
10
8
900MHz 970MHz 70MHz
1950MHz
f
= 2450MHz
= 1950MHz
20
15
10
5
2020MHz 70MHz
2450MHz 2210MHz 70MHz
RF
12
10
8
f
f
= 2450MHz
RF
f
RF
= 1950MHz
RF
f
= 2450MHz
= 1950MHz
RF
f
= 900MHz
f
RF
RF
f
RF
= 900MHz
6
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
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
0
0
300
300
300
IMAGINARY
IMAGINARY
IMAGINARY
-100
-200
-300
-400
-500
-600
-100
-200
-300
-400
-500
-600
-100
-200
-300
-400
-500
-600
250
200
150
100
50
250
200
150
100
50
250
200
150
100
50
REAL
REAL
2000
REAL
f
P
= 970MHz
LO
f
P
= 970MHz
LO
f
P
= 970MHz
LO
= -5dBm
LO
= -5dBm
LO
= -5dBm
LO
0
0
0
0
500
1000
1500
2000
2500
0
500
1000
1500
2500
0
500
1000
1500
2000
2500
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
Maxim Integrated
│ 6
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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.)
CC
RFIN LO A
MAX2680
MAX2681
MAX2682
IF PORT IMPEDANCE vs. IF FREQUENCY
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
0
1200
1200
800
f
P
= 970MHz
= -5dBm
f
P
= 970MHz
= -5dBm
LO
LO
f
= 970MHz
P = -5dBm
LO
LO
LO
-50
LO
700
600
-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
500
400
IMAGINARY
IMAGINARY
-200
-250
-300
-350
-400
300
200
REAL
REAL
REAL
100
0
0
100
200
300
400
500
0
200
0
100
200
300
400
500
0
200
0
100
200
300
400
500
IF FREQUENCY (MHz)
IF FREQUENCY (MHz)
IF FREQUENCY (MHz)
MAX2680
MAX2681
MAX2682
LO PORT RETURN LOSS
LO PORT RETURN LOSS
LO PORT RETURN LOSS
+10
+5
+10
+5
+10
+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
760
1320
1880
2440
3000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2680
MAX2681
MAX2682
LO-to-IF AND LO-to-RF ISOLATION
LO-to-IF AND LO-to-RF ISOLATION
LO-to-IF AND LO-to-RF ISOLATION
35
30
25
20
15
10
5
40
35
30
25
35
30
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
0
500
1000
1500
2000
2500
500
1000
1500
2000
2500
500
1000
1500
2000
2500
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
Maxim Integrated
│ 7
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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.)
CC
RFIN LO A
MAX2680
MAX2681
MAX2682
TURN-OFF/ON CHARACTERISTICS
TURN-OFF/ON CHARACTERISTICS
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 Configuration
TOP VIEW
LO
1
2
3
6
5
4
SHDN
MAX2680
MAX2681
MAX2682
GND
RFIN
V
CC
IFOUT
SOT23-6
Pin Description
PIN
NAME
FUNCTION
Local-Oscillator Input. Apply a local-oscillator signal with an amplitude of -10dBm to 0 (50Ω source).
1
LO
AC-couple this pin to the oscillator with a DC-blocking capacitor. Nominal DC voltage is V
- 0.4V.
CC
2
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 the Applications Information section for details on impedance matching.
3
Intermediate Frequency Output. Open-collector output requires an inductor to V . AC-couple to this pin
CC
with a DC-blocking capacitor. See the 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
Maxim Integrated
│ 8
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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 output
The MAX2680/MAX2681/MAX2682 are 400MHz to
2.5GHz, silicon-germanium, double-balanced downcon-
verter mixers. They are designed to provide optimum
linearity performance for a specified supply current.
They consist of a double-balanced Gilbert-cell mixer with
single-ended RF, LO, and IF port connections. An on-chip
bias cell provides a low-power shutdown feature. Consult
the Selector Guide for device features and comparison.
that requires an external inductor to V
for proper biasing.
CC
For optimum performance, the IF port requires an imped-
ance-matching network. The configuration and values for
the matching network is dependent upon the frequency and
desired output impedance. For assistance in choosing com-
ponents for optimal performance, see Table 3 and Table 4
as well as the IF Port Impedance vs. IF Frequency graph in
the Typical Operating Characteristics section.
Applications Information
Local-Oscillator (LO) Input
Power-Supply and SHDN Bypassing
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 (50Ω source).
Proper attention to voltage supply bypassing is essential
for high-frequency RF circuit stability. Bypass V
with a
CC
10μF capacitor in parallel with a 1000pF capacitor. Use
separate vias to the ground plane for each of the bypass
capacitors and minimize trace length to reduce induc-
tance. Use separate vias to the ground plane for each
ground pin. Use low-inductance ground connections.
RF Input
Decouple SHDN with a 1000pF capacitor to ground to
minimize noise on the internal bias cell. Use a series
resistor (typically 100Ω) to reduce coupling of high-fre-
quency signals into the SHDN pin.
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 section for information
on matching.
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
MAX2680
MAX2681
MAX2682
32-j94
34-j108
34-j106
33-j73
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
MHz
1950
MHz
2450
MHz
MHz
270pF
18nH
Open
Z1
Z2
Z3
86nH
270pF
Open
270pF 1.5pF
Short
68nH
1.5pF
Short
68nH
1.5pF
Short
Short
22nH
Open
270pF 270pF 270pF
1.8nH 1.8nH 0.5pF
270pF 270pF 270pF 270pF 270pF 270pF
1.8nH 2.2nH 0.5pF 10nH 2.2nH 1.2nH
Note: Z1, Z2, and Z3 are found in the Typical Operating Circuit.
Maxim Integrated
│ 9
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
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 with
FREQUENCY
PART
45MHz
960-j372
934-j373
670-j216
70MHz
803-j785
746-j526
578-j299
240MHz
186-j397
161-j375
175-j296
a large decoupling capacitor at a central V
node. The
CC
MAX2680
MAX2681
MAX2682
V
traces branch out from this central node, each going
CC
to a separate V
node on the PC board. At the end of
CC
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. At high frequencies, any
CC
signal leaking out of one supply pin sees a relatively high
impedance (formed by the V trace inductance) to the
Table 4. IF Output Impedance-Matching
Components
CC
central V
node, and an even higher impedance to any
CC
other supply pin, as well as a low impedance to ground
through the bypass capacitor.
FREQUENCY
70MHz
330nH
MATCHING
COMPONENT
45MHz
390nH
39pF
240MHz
82nH
3pF
Impedance-Matching Network Layout
L1
C2
R1
The RFIN and IFOUT impedance-matching networks
are very sensitive to layout-related parasitics. To mini-
mize parasitic inductance, keep all traces short and
place components as close as possible to the chip. To
minimize 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.
15pF
250Ω
Open
Open
Typical Operating Circuit
C1
LO
1
2
6
5
4
SHUTDOWN
CONTROL
C3
SHDN
LO
INPUT
MAX2680
MAX2681
MAX2682
V
CC
V
CC
GND
+2.7V TO +5.5V
C4
C5
10µF
1000pF
R1
L1
Z
Z
2
1
RF
IF
OUTPUT
3
RFIN
IFOUT
INPUT
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.
Maxim Integrated
│ 10
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
400MHz to 2.5GHz, Low-Noise,
SiGe Downconverter Mixers
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Maxim Integrated
│ 11
www.maximintegrated.com
MAX2680/MAX2681/
MAX2682
400MHz to 2.5GHz, Low-Noise,
SiGe Downconverter Mixers
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2003 Maxim Integrated Products, Inc.
│ 12
相关型号：
©2020 ICPDF网 联系我们和版权申明