MAXIM MAX9982

19-2489; Rev 1; 9/02
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
Features
The MAX9982 fully integrated SiGe mixer is optimized to
meet the demanding requirements of GSM850, GSM900,
and CDMA850 base-station receivers. Each high-linearity device includes a local oscillator (LO) switch, LO driver, and active mixer. On-chip baluns are also integrated
to allow for single-ended RF and LO inputs. Since the
active mixer provides 2dB of conversion gain, the device
effectively replaces the IF amplifier stage, which typically
follows most passive mixer implementations.
♦ +26.8dBm Input IP3
The MAX9982 provides exceptional linearity with an
input IP3 of greater than +26dBm. The integrated LO
driver allows for a wide range of LO drive levels from
-5dBm to +5dBm. In addition, the built-in switch
enables rapid LO selection of less than 250ns, as needed for GSM frequency-hopping applications.
The MAX9982 is available in a 20-pin QFN package
(5mm ✕ 5mm) with an exposed paddle and is specified
over the -40°C to +85°C extended temperature range.
♦ 12dB Noise Figure
♦ +13dBm Input 1dB Compression Point
♦ 825MHz to 915MHz RF Frequency Range
♦ 70MHz to 170MHz IF Frequency Range
♦ 725MHz to 1085MHz LO Frequency Range
♦ 2dB Conversion Gain
♦ -5dBm to +5dBm LO Drive
♦ 5V Single-Supply Operation
♦ Built-In LO Switch
♦ ESD Protection
♦ Internal RF and LO Baluns for Single-Ended Inputs
Applications
GSM850/GSM900 2G and 2.5G EDGE Base
Station Receivers
Cellular cdmaOneTM and cdma2000TM Base
Station Receivers
Ordering Information
PART
TEMP RANGE
MAX9982ETP
-40°C to +85°C
PIN-PACKAGE
20 QFN-EP* (5mm × 5mm)
*EP = exposed paddle.
TDMA and Integrated Digital Enhanced
Network (iDEN)TM Base Station Receivers
Pin Configuration/
Functional Diagram
Digital and Spread-Spectrum Communication
Systems
Microwave Links
IF-
GND
18
17
GND
IF+
19
16
GND
20
TOP VIEW
MAX9982
Typical Application Circuit appears at end of data sheet.
cdmaOne is a trademark of CDMA Development Group.
cdma2000 is a trademark of Telecommunications Industry
Association.
RF
1
15
LO2
TAP
2
14
GND
GND
3
13
GND
RFBIAS
4
12
GND
GND
5
11
LO1
8
9
10
GND
VCC
7
GND
LOSEL
6
VCC
iDEN is a trademark of Motorola, Inc.
QFN
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX9982
General Description
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
ABSOLUTE MAXIMUM RATINGS
VCC ........................................................................-0.3V to +5.5V
IF+, IF-, RFBIAS, LOSEL.............................-0.3V to (VCC + 0.3V)
TAP .....................................................................................+5.0V
RFBIAS Current.....................................................................5mA
RF, LO1, LO2 Input Power .............................................+20dBm
Continuous Power Dissipation (TA = +70°C)
20-Pin QFN (derate 20.8mW/°C above TA = +70°C) ....1.66W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +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
(Typical Application Circuit, VCC = 4.75V to 5.25V, no RF signals applied, all RF inputs and outputs terminated with 50Ω, TA =
-40°C to +85°C, unless otherwise noted. Typical values are at VCC = 5V, TA = +25°C, unless otherwise noted.)
MIN
TYP
MAX
UNITS
Supply Voltage
PARAMETER
VCC
4.75
5.00
5.25
V
Supply Current
ICC
138
168
193
mA
VCC +
0.3V
V
Input High Voltage
Input Low Voltage
LOSEL Input Current
SYMBOL
CONDITIONS
VIH
3.5
VIL
ILOSEL
-5
0.4
V
+5
µA
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, VCC = 4.75V to 5.25V, PLO = -5dBm to +5dBm, fRF = 825MHz to 915MHz, fLO = 725MHz to 1085MHz,
TA = -40°C to +85°C, unless otherwise noted. Typical values at VCC = +5.0V, PRF = -5dBm, PLO = 0dBm, fRF = 870MHz, fLO =
770MHz, TA = +25°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RF Frequency
fRF
825
915
MHz
LO Frequency
fLO
725
1085
MHz
IF Frequency
fIF
70
170
MHz
-5
+5
dBm
LO Drive Level
Conversion Gain (Note 3)
Must meet RF and LO frequency range; IF
matching components affect IF frequency
range
PLO
GC
VCC = +5.0V,
fIF = 100MHz,
low-side injection,
PRF = 0dBm,
PLO = -5dBm
Cellular band,
fRF = 825MHz to
850MHz
dB
GSM band,
fRF = 880MHz to
915MHz
Gain Variation Over Temperature
TA = -40°C to +85°C
Gain Variation from Nominal
fRF = 825MHz to 915MHz, 3σ
2
2.6
2.1
-0.0135
dB/°C
±0.6
dB
_______________________________________________________________________________________
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
(Typical Application Circuit, VCC = 4.75V to 5.25V, PLO = -5dBm to +5dBm, fRF = 825MHz to 915MHz, fLO = 725MHz to 1085MHz,
TA = -40°C to +85°C, unless otherwise noted. Typical values at VCC = +5.0V, PRF = -5dBm, PLO = 0dBm, fRF = 870MHz, fLO =
770MHz, TA = +25°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
Inject PIN = -20dBm at fLO + 100MHz into
LO port; measure 100MHz at IF port as
POUT; no RF signal at RF port
Conversion Loss from LO to IF
Noise Figure
CONDITIONS
NF
47
UNITS
dB
11.3
11.8
Low-side injection
12.9
High-side injection
14.5
VCC = +5.0V, PRF = 0dBm, PLO = -5dBm,
TA = +25°C (Notes 3, 4)
26.8
dBm
±0.5
dB
Input Third-Order Intercept Point
IIP3
Input Third-Order Intercept Point
Variation Over Temperature
∆IIP3
TA = -40°C to +85°C
2×2
fRF = 915,
fLO = 815MHz,
fSPUR = 865MHz,
PRF = -5dBm
3×3
MAX
Cellular band, fRF = 825MHz to 850MHz
P1dB
3 RF - 3 LO Spur Rejection
TYP
GSM band, fRF = 880MHz to 915MHz
Input 1dB Compression Point
2 RF - 2 LO Spur Rejection
MIN
fRF = 915,
fLO = 815MHz,
fSPUR = 848.3MHz,
PRF = -5dBm
PLO = +5dBm
65
PLO = 0dBm
57
PLO = +5dBm
89
PLO = 0dBm
89
dB
dBm
dBc
dBc
Maximum LO Leakage at RF Port
PLO = -5dBm to +5dBm,
fLO = 725MHz to 1085MHz
-40
dBm
Maximum LO Leakage at IF Port
PLO = -5dBm to +5dBm,
fLO = 725MHz to 1085MHz
-28
dBm
Minimum RF to IF Isolation
PLO = -5dBm to +5dBm,
fRF = 825MHz to 915MHz
11
dB
LO1 to LO2 Isolation
fRF = 825MHz to 915MHz, PLO1 = PLO2 =
+5dBm, fIF = 100MHz (Note 5)
51
dB
LO Switching Time
50% of LOSEL to IF settled within 2°
250
ns
19
dB
RF Return Loss
LO Return Loss
IF Return Loss
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
LO port active
20
LO port inactive
12
RF and LO terminated (Note 6)
15
dB
dB
Guaranteed by design and characterization.
All limits reflect losses of external components. Output measurements taken at IF OUT of Typical Application Circuit.
Production tested.
Two tones at 1MHz spacing, 0dBm each at RF port.
Measured at IF port at IF frequency. LO1 and LO2 are offset by 1MHz.
IF return loss can be optimized by external matching components.
_______________________________________________________________________________________
3
MAX9982
AC ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA = +25°C, unless otherwise noted.)
CONVERSION GAIN vs. RF FREQUENCY
LOW-SIDE INJECTION
165
VCC = 5V
160
VCC = 4.75V
155
TA = -40°C
2.5
TA = +25°C
2.0
1.5
150
fIF = 120MHz
3.0
-15
10
35
60
85
TA = -40°C
2.5
2.0
TA = +25°C
1.5
TA = +85°C
1.0
TA = +85°C
1.0
-40
0.5
820
840
860
880
900
920
820
840
860
900
920
RF FREQUENCY (MHz)
CONVERSION GAIN vs. RF FREQUENCY
LOW-SIDE INJECTION
CONVERSION GAIN vs. RF FREQUENCY
HIGH-SIDE INJECTION
CONVERSION GAIN vs. RF FREQUENCY
LOW-SIDE INJECTION
fIF = 120MHz
2.6
2.4
PLO = -5dBm, 0dBm, +5dBm
2.2
fIF = 100MHz
2.8
CONVERSION GAIN (dB)
CONVERSION GAIN (dB)
2.4
3.0
MAX9982toc05
MAX9982toc04
2.8
2.6
2.2
2.0
PLO = -5dBm, 0dBm, +5dBm
1.8
2.0
840
860
880
900
VCC = 5V
2.2
840
860
880
900
820
920
840
860
900
920
RF FREQUENCY (MHz)
2 RF - 2 LO vs. RF FREQUENCY
LOW-SIDE INJECTION
2 LO - 2 RF RESPONSE vs. RF FREQUENCY
HIGH-SIDE INJECTION
2 RF - 2 LO RESPONSE vs. RF FREQUENCY
LOW-SIDE INJECTION
TA = +25°C
PRF = -5dBm
PLO = +5dBm
fIF = 120MHz
2 RF - 2 LO RESPONSE (dBc)
65
56
TA = +85°C
54
TA = +25°C
52
60
75
MAX9982 toc08
MAX9982 toc07
TA = -40°C
70
58
TA = -40°C
PRF = -5dBm
fIF = 100MHz
70
PLO = +5dBm
65
60
PLO = 0dBm
55
50
PLO = -5dBm
TA = +85°C
50
55
840
860
880
RF FREQUENCY (MHz)
900
920
MAX9982 toc09
RF FREQUENCY (MHz)
PRF = -5dBm
PLO = +5dBm
fIF = 100MHz
820
880
RF FREQUENCY (MHz)
80
75
VCC = 5.25V
2.4
1.8
820
920
2 LO - 2 RF RESPONSE (dBc)
820
VCC = 4.75V
2.6
2.0
1.6
1.8
MAX9982toc06
RF FREQUENCY (MHz)
fIF = 100MHz
4
880
TEMPERATURE (°C)
3.0
CONVERSION GAIN (dB)
MAX9982toc02
3.5
3.0
3.5
CONVERSION GAIN (dB)
VCC = 5.25V
170
fIF = 100MHz
CONVERSION GAIN (dB)
175
BIAS CURRENT (mA)
4.0
MAX9982toc01
180
CONVERSION GAIN vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982toc03
BIAS CURRENT vs. TEMPERATURE
2 RF - 2 LO RESPONSE (dBc)
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
45
820
840
860
880
RF FREQUENCY (MHz)
900
920
820
840
860
880
RF FREQUENCY (MHz)
_______________________________________________________________________________________
900
920
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
fIF = 100MHz
PLO = 0dBm
28
INPUT IP3 (dBm)
55.0
52.5
PLO = +5dBm
50.0
fIF = 120MHz
31
TA = +85°C
27
TA = +25°C
TA = -40°C
26
25
840
860
880
900
25
820
840
860
880
900
920
820
860
880
900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
INPUT IP3 vs. RF FREQUENCY
LOW-SIDE INJECTION
INPUT IP3 vs. RF FREQUENCY
HIGH-SIDE INJECTION
INPUT IP3 vs. RF FREQUENCY
LOW-SIDE INJECTION
fIF = 120MHz
PLO = -5dBm
29
fIF = 100MHz
PLO = -5dBm
PLO = +5dBm
28
27
PLO = +5dBm
860
880
900
26.0
820
920
VCC = 5.0V
VCC = 4.75V
25
840
27.0
26.5
26
26.5
VCC = 5.25V
27.5
INPUT IP3 (dBm)
27.5
840
860
880
900
920
820
840
860
880
900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
INPUT P1dB vs. RF FREQUENCY
LOW-SIDE INJECTION
INPUT P1dB vs. RF FREQUENCY
HIGH-SIDE INJECTION
INPUT P1dB vs. RF FREQUENCY
LOW-SIDE INJECTION
fIF = 120MHz
TA = +85°C
13.50
15.5
fIF = 100MHz
13.5
920
MAX9982 toc18
fIF = 100MHz
MAX9982 toc17
16.0
MAX9982 toc16
14.0
920
28.0
PLO = 0dBm
INPUT IP3 (dBm)
PLO = 0dBm
30
MAX9982 toc14
fIF = 100MHz
820
840
RF FREQUENCY (MHz)
28.0
INPUT IP3 (dBm)
920
MAX9982 toc13
820
MAX9982 toc15
45.0
TA = +85°C
13.0
12.5
15.0
14.5
TA = +25°C
14.0
TA = +25°C
TA = -40°C
INPUT P1dB (dBm)
13.25
INPUT P1dB (dBm)
INPUT P1dB (dBm)
TA = +25°C
28
TA = +85°C
47.5
27.0
29
27
26
PLO = -5dBm
TA = -40°C
30
INPUT IP3 (dBm)
57.5
32
MAX9982 toc11
PRF = -5dBm
fIF = 120MHz
INPUT IP3 vs. RF FREQUENCY
HIGH-SIDE INJECTION
29
MAX9982 toc10
2 LO - 2 RF RESPONSE (dBc)
60.0
INPUT IP3 vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc12
2 LO - 2 RF RESPONSE vs. RF FREQUENCY
HIGH-SIDE INJECTION
PLO = -5dBm
13.00
12.75
TA = -40°C
12.0
13.0
820
840
860
880
RF FREQUENCY (MHz)
900
920
PLO = 0dBm
PLO = +5dBm
13.5
12.50
820
840
860
880
RF FREQUENCY (MHz)
900
920
820
840
860
880
900
920
RF FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX9982
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA = +25°C, unless otherwise noted.)
LO SWITCH ISOLATION vs. RF FREQUENCY
LOW-SIDE INJECTION
INPUT P1dB (dBm)
13.0
VCC = 5V
12.5
LO OFFSET 1MHz
fIF = 100MHz
55
53
LO OFFSET 1MHz
fIF = 120MHz
LO SWITCH ISOLATION (dB)
VCC = 5.25V
13.5
54
MAX9982 toc20
fIF = 100MHz
LO SWITCH ISOLATION (dB)
MAX9982 toc19
14.0
LO SWITCH ISOLATION vs. RF FREQUENCY
HIGH-SIDE INJECTION
TA = +85°C
52
51
TA = +25°C
TA = -40°C
MAX9982 toc21
INPUT P1dB vs. RF FREQUENCY
LOW-SIDE INJECTION
50
54
53
TA = +85°C
52
TA = +25°C
51
TA = -40°C
VCC = 4.75V
49
840
860
880
900
50
820
920
840
860
920
820
840
LO OFFSET 1MHz
fIF = 100MHz
-32.5
LO LEAKAGE (dBm)
52
51
PLO = 0dBm
920
PLO = +5dBm
-30
-35.0
-37.5
TA = +25°C
-40.0
900
-20
TA = -40°C
PLO = -5dBm
880
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
MAX9982 toc23
-30.0
MAX9982 toc22
54
860
RF FREQUENCY (MHz)
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
LO SWITCH ISOLATION vs. RF FREQUENCY
LOW-SIDE INJECTION
LO SWITCH ISOLATION (dB)
900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
53
880
LO LEAKAGE (dBm)
820
MAX9982 toc24
12.0
PLO = +5dBm
-40
PLO = 0dBm
PLO = -5dBm
-50
50
-42.5
TA = +85°C
-45.0
49
840
860
880
900
925
1025
1125
825
925
1025
LO FREQUENCY (MHz)
LO LEAKAGE AT RF PORT
vs. LO FREQUENCY
RF LEAKAGE AT IF PORT
vs. RF FREQUENCY
RF LEAKAGE AT IF PORT
vs. RF FREQUENCY
-42
PLO = -5dBm
-46
-14
-16
TA = +25°C
-18
-48
900
1000
LO FREQUENCY (MHz)
1100
MAX9982 toc27
PLO = -5dBm, 0dBm, +5dBm
-14
-16
-20
-22
800
1125
-18
TA = +85°C
-20
-12
RF LEAKAGE (dBc)
PLO = 0dBm
TA = -40°C
-12
-10
MAX9982 toc26
-10
MAX9982 toc25
PLO = +5dBm
700
725
LO FREQUENCY (MHz)
-40
6
825
RF FREQUENCY (MHz)
-38
-44
-60
725
920
RF LEAKAGE (dBc)
820
LO LEAKAGE (dBm)
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
820
840
860
880
RF FREQUENCY (MHz)
900
920
820
840
860
880
RF FREQUENCY (MHz)
_______________________________________________________________________________________
900
920
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
NOISE FIGURE vs. RF FREQUENCY
HIGH-SIDE INJECTION
TA = +85°C
15
NOISE FIGURE (dB)
TA = +25°C
12
TA = -40°C
10
14
TA = +25°C
13
0
5
12
10
PLO = -5dBm, 0dBm, +5dBm
15
20
25
TA = -40°C
11
860
880
900
920
30
840
820
RF FREQUENCY (MHz)
860
880
900
920
840
860
880
900
920
RF FREQUENCY (MHz)
IF RETURN LOSS
vs. IF FREQUENCY
LO RETURN LOSS
vs. LO FREQUENCY
0
5
820
RF FREQUENCY (MHz)
MEASURED ON LO1 PORT
LOSEL IS LOGIC HIGH (LO1 INPUT SELECTED)
0
10
PLO = -5dBm
15
PLO = +5dBm
20
25
IF MATCH IS TUNED FOR 70MHz. MATCHING
FOR HIGHER FREQUENCIES IS POSSIBLE.
5
RETURN LOSS (dB)
840
MAX9982 toc31
820
MAX9982 toc32
9
RETURN LOSS (dB)
NOISE FIGURE (dB)
SINGLE SIDEBAND
RETURN LOSS (dB)
TA = +85°C
13
11
16
MAX9982 toc29
SINGLE SIDEBAND
MAX9982 toc28
14
RF RETURN LOSS
vs. RF FREQUENCY
MAX9982 toc30
NOISE FIGURE vs. RF FREQUENCY
LOW-SIDE INJECTION
10
15
20
25
PLO = 0dBm
30
30
700
800
900
1000
LO FREQUENCY (MHz)
1100
70
90
110
130
150
170
IF FREQUENCY (MHz)
_______________________________________________________________________________________
7
MAX9982
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA = +25°C, unless otherwise noted.)
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
MAX9982
Pin Description
PIN
NAME
FUNCTION
1
RF
2
TAP
RF Balun Center Tap. Connect bypass capacitors from this pin to ground.
3, 5, 7, 9, 12,
13, 14, 16, 17,
20, EP
GND
Ground
4
RFBIAS
6, 10
VCC
8
LOSEL
11
LO1
Local Oscillator Input 1. This input is internally matched to 50Ω and is DC shorted to ground
when selected. Requires a DC-blocking capacitor.
15
LO2
Local Oscillator Input 2. This input is internally matched to 50Ω and is DC shorted to ground
when selected.
18, 19
IF-, IF+
Differential IF Output. Connect 560nH pullup inductors and 137Ω pullup resistors from each
of these pins to VCC for a 70MHz to 120MHz IF range.
RF Input. This input is internally matched to 50Ω and is DC shorted to ground.
Bias control for the mixer. Connect a 249Ω resistor from this pin to ground to set the bias
current for the mixer.
Power-Supply Connections. Connect a 0.1µF bypass capacitor from each VCC pin to ground.
Local Oscillator Select. Set this pin to logic HIGH to select LO1; set to logic LOW to select
LO2.
Table 1. Component List
COMPONENT
VALUE
SIZE
C1, C2, C6, C7
33pF
0603
Murata GRM1885C1H330J
C3
0.033µF
0603
Murata GRM188R71E333K
C4, C5
0.1µF
0603
Murata GRM188FS1E104Z
C8, C11
220pF
0603
Murata GRM1885C1H221J
C9, C10
330pF
0603
Murata GRM1885C1H331J
L1, L2
560nH
1008
Coilcraft 1008CS-561XJBB
R1
249Ω ±1%
0603
Panasonic ERJ-3EKF2490V
R3, R4
137Ω ±1%
0603
Panasonic ERJ-3EKF1370V
T1
4:1 (200:50)
—
U1
—
20-pin 5mm x 5mm QFN
Detailed Description
The MAX9982 downconverter mixer is designed for
GSM and CDMA base station receivers with an RF frequency between 825MHz and 915MHz. It implements
an active mixer that provides 2dB of overall conversion
gain to the receive path, removing the need for an additional IF amplifier. The mixer has excellent input IP3
measuring +26.8dBm. The device also features integrated RF and LO baluns that allow the mixers to be
driven with single-ended signals.
8
PART
Mini-Circuits TC4-1W-7A
MAX9982ETP
RF Inputs
The MAX9982 has one input (RF) that is internally
matched to 50Ω requiring no external matching components. A 33pF DC-blocking capacitor is required at the
input since the input is internally DC shorted to ground
through a balun. The input frequency range is 825MHz
to 915MHz.
LO Inputs
The mixer can be used for either high-side or low-side
injection applications with an LO frequency range of
_______________________________________________________________________________________
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
Internal LO buffers allow for a wide power range on the
LO ports. The LO signal power can vary from -5dBm to
+5dBm. LO1 and LO2 are internally matched to 50Ω,
so only a 33pF DC-blocking capacitor is required at
each LO port.
IF Outputs
This mixer has an IF frequency range of 70MHz to
170MHz. The differential IF output ports require external
pullup inductors to VCC to resonate out the differential
on-chip capacitance of 1.8pF. See the Typical Application Circuit for recommended component values for an
IF optimized for 70MHz to 100MHz. Higher IF frequencies can be optimized by reducing the values of L1 and
L2.
Removing the ground plane from underneath L1 and L2
reduces parasitic capacitive loading and improves
VSWR.
Bias Circuitry
Connect a bias resistor from RFBIAS to ground to set the
mixer bias current. A nominal resistor value of 249Ω sets
an input IP3 of +26.8dBm and supply current of 168mA.
Applications Information
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and inductance. For best performance, route the ground pin
traces directly to the exposed paddle underneath the
package. Solder the exposed pad on the bottom of the
device package evenly to the board ground plane to
provide a heat transfer path along with RF grounding. If
the PC board ground plane is not immediately available
on the top metal layer, provide multiple vias between
the exposed paddle connection and the PC board
ground plane.
Power-Supply Bypassing
Proper voltage supply bypassing is essential for highfrequency circuit stability. Bypass each VCC pin with a
0.1µF capacitor. Bypass TAP by placing a 33pF (C2) to
ground within 100 mils of the TAP pin.
Chip Information
TRANSISTOR COUNT: 179
PROCESS: BiCMOS
_______________________________________________________________________________________
9
MAX9982
725MHz to 1085MHz. An internal LO switch allows for
switching between two single-ended LO ports; this is
useful for fast frequency changes/frequency hopping.
LO switching time is typically less than 250ns. The
switch is controlled by a digital input (LOSEL) that
when high, selects LO1 and when low, selects LO2.
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
MAX9982
Typical Application Circuit
C9
L1
R3
5V
C8
C11
R4
L2
3
T1
6
IF OUT
2
4:1 (200:50)
TRANSFORMER
1
4
C1
RFIN
C2
GND
16
GND
17
IF18
1
15
2
GND
RFBIAS
R1
IF+
MAX9982
RF
TAP
C3
19
20
GND
C10
GND
14
3
13
4
12
5
11
LO2
GND
LO2
C7
GND
GND
LO1
LO1
C4
9
10
VCC
GND
7
8
LOSEL
VCC
5V
GND
6
C6
5V
C5
LO SELECT
10
______________________________________________________________________________________
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
b
CL
0.10 M C A B
D2/2
D/2
PIN # 1
I.D.
QFN THIN.EPS
D2
0.15 C A
D
k
0.15 C B
PIN # 1 I.D.
0.35x45
E/2
E2/2
CL
(NE-1) X e
E
E2
k
L
DETAIL A
e
(ND-1) X e
CL
CL
L
L
e
e
0.10 C
A
C
0.08 C
A1 A3
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
21-0140
C
1
2
______________________________________________________________________________________
11
MAX9982
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.)
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
Package Information (continued)
(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.)
COMMON DIMENSIONS
EXPOSED PAD VARIATIONS
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1
SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE
ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm
FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
PROPRIETARY INFORMATION
9. DRAWING CONFORMS TO JEDEC MO220.
TITLE:
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
APPROVAL
DOCUMENT CONTROL NO.
REV.
21-0140
C
2
2
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.