General Description
The MAX9982 fully integrated SiGe mixer is optimized to
meet the demanding requirements of GSM850, GSM900,
and CDMA850 base-station receivers. Each high-lineari-
ty device includes a local oscillator (LO) switch, LO dri-
ver, 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.
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 need-
ed 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.
Applications
GSM850/GSM900 2G and 2.5G EDGE Base
Station Receivers
Cellular cdmaOneTM and cdma2000TM Base
Station Receivers
TDMA and Integrated Digital Enhanced
Network (iDEN)TM Base Station Receivers
Digital and Spread-Spectrum Communication
Systems
Microwave Links
Features
♦+26.8dBm Input IP3
♦+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
♦12dB Noise Figure
♦-5dBm to +5dBm LO Drive
♦5V Single-Supply Operation
♦Built-In LO Switch
♦ESD Protection
♦Internal RF and LO Baluns for Single-Ended Inputs
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
________________________________________________________________ Maxim Integrated Products 1
19-2489; Rev 1; 9/02
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.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9982ETP
-40°C to +85°C
20 QFN-EP* (5mm × 5mm)
20
19
18
17
GND
IF+
IF-
GND
16 GND
13
12
11
14
15
GND
GND
GND
LO2
LO1
4
3
2
1
RFBIAS
TAP
RF
5GND
GND
6
7
8
9
VCC
VCC
GND
GND
LOSEL
10
MAX9982
TOP VIEW
QFN
Pin Configuration/
Functional Diagram
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.
iDEN is a trademark of Motorola, Inc.
*EP = exposed paddle.
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Supply Voltage VCC
4.75 5.00 5.25
V
Supply Current ICC
138 168 193
mA
Input High Voltage VIH 3.5
VCC +
0.3V
V
Input Low Voltage VIL 0.4 V
LOSEL Input Current ILOSEL -5 +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
Must meet RF and LO frequency range; IF
matching components affect IF frequency
range
70
170
MHz
LO Drive Level PLO -5 +5
dBm
Cellular band,
fRF = 825MHz to
850MHz
2.6
Conversion Gain (Note 3) GC
VCC = +5.0V,
fIF = 100MHz,
low-side injection,
PRF = 0dBm,
PLO = -5dBm
GSM band,
fRF = 880MHz to
915MHz
2.1
dB
Gain Variation Over Temperature
TA = -40°C to +85°C
-0.0135
dB/°C
Gain Variation from Nominal fRF = 825MHz to 915MHz, 3σ
±0.6
dB
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS (continued)
(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
CONDITIONS
MIN
TYP
MAX
UNITS
Conversion Loss from LO to IF
Inject PIN = -20dBm at fLO + 100MHz into
LO port; measure 100MHz at IF port as
POUT; no RF signal at RF port
47 dB
Cellular band, fRF = 825MHz to 850MHz
11.3
Noise Figure NF GSM band, fRF = 880MHz to 915MHz
11.8
dB
Low-side injection
12.9
Input 1dB Compression Point P1dB High-side injection
14.5
dBm
Input Third-Order Intercept Point
IIP3 VCC = +5.0V, PRF = 0dBm, PLO = -5dBm,
TA = +25°C (Notes 3, 4)
26.8
dBm
Input Third-Order Intercept Point
Variation Over Temperature ∆IIP3 TA = -40°C to +85°C
±0.5
dB
PLO = +5dBm 65
2 RF - 2 LO Spur Rejection 2 × 2
fRF = 915,
fLO = 815MHz,
fSPUR = 865MHz,
PRF = -5dBm PLO = 0dBm 57
dBc
PLO = +5dBm 89
3 RF - 3 LO Spur Rejection 3 × 3
fRF = 915,
fLO = 815MHz,
fSPUR = 848.3MHz,
PRF = -5dBm PLO = 0dBm 89
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
RF Return Loss 19 dB
LO port active 20
LO Return Loss LO port inactive 12 dB
IF Return Loss RF and LO terminated (Note 6) 15 dB
Note 1: Guaranteed by design and characterization.
Note 2: All limits reflect losses of external components. Output measurements taken at IF OUT of Typical Application Circuit.
Note 3: Production tested.
Note 4: Two tones at 1MHz spacing, 0dBm each at RF port.
Note 5: Measured at IF port at IF frequency. LO1 and LO2 are offset by 1MHz.
Note 6: IF return loss can be optimized by external matching components.
Typical Operating Characteristics
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA= +25°C, unless otherwise noted.)
150
160
165
155
170
175
180
-40 85
BIAS CURRENT vs. TEMPERATURE
MAX9982toc01
TEMPERATURE (°C)
BIAS CURRENT (mA)
10-15 35 60
VCC = 5.25V
VCC = 4.75V
VCC = 5V
CONVERSION GAIN vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982toc02
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
900880860840
1.5
2.0
2.5
3.0
3.5
4.0
1.0
820 920
TA = -40°C
TA = +25°C
TA = +85°C
fIF = 100MHz
CONVERSION GAIN vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982toc03
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
900880860840
1.0
1.5
2.0
2.5
3.0
3.5
0.5
820 920
TA = -40°C
TA = +25°C
TA = +85°C
fIF = 120MHz
CONVERSION GAIN vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982toc04
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
900880860840
2.0
2.2
2.4
2.6
2.8
3.0
1.8
820 920
PLO = -5dBm, 0dBm, +5dBm
fIF = 100MHz
MAX9982 toc07
RF FREQUENCY (MHz)
2 RF - 2 LO RESPONSE (dBc)
900880860840
60
65
70
75
80
55
820 920
2 RF - 2 LO vs. RF FREQUENCY
LOW-SIDE INJECTION
PRF = -5dBm
PLO = +5dBm
fIF = 100MHz
TA = -40°C
TA = +25°C
TA = +85°C
CONVERSION GAIN vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982toc05
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
900880860840
1.8
2.0
2.2
2.4
2.6
1.6
820 920
PLO = -5dBm, 0dBm, +5dBm
fIF = 120MHz
CONVERSION GAIN vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982toc06
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
900880860840
2.0
2.2
2.4
2.6
2.8
3.0
1.8
820 920
fIF = 100MHz
VCC = 4.75V
VCC = 5.25V
VCC = 5V
MAX9982 toc08
RF FREQUENCY (MHz)
2 LO - 2 RF RESPONSE (dBc)
900880860840
52
54
56
58
50
820 920
TA = -40°C
TA = +25°C
TA = +85°C
2 LO - 2 RF RESPONSE vs. RF FREQUENCY
HIGH-SIDE INJECTION
PRF = -5dBm
PLO = +5dBm
fIF = 120MHz
MAX9982 toc09
RF FREQUENCY (MHz)
2 RF - 2 LO RESPONSE (dBc)
900880860840
50
55
60
65
70
75
45
820 920
2 RF - 2 LO RESPONSE vs. RF FREQUENCY
LOW-SIDE INJECTION
PRF = -5dBm
fIF = 100MHz
PLO = 0dBm
PLO = +5dBm
PLO = -5dBm
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
4 _______________________________________________________________________________________
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA= +25°C, unless otherwise noted.)
MAX9982 toc10
RF FREQUENCY (MHz)
2 LO - 2 RF RESPONSE (dBc)
900880860840
47.5
50.0
52.5
55.0
57.5
60.0
45.0
820 920
2 LO - 2 RF RESPONSE vs. RF FREQUENCY
HIGH-SIDE INJECTION
PRF = -5dBm
fIF = 120MHz
PLO = -5dBm
PLO = +5dBm
PLO = 0dBm
INPUT IP3 vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc11
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900880860840
26
27
28
29
25
820 920
TA = -40°CTA = +25°C
TA = +85°C
fIF = 100MHz
INPUT IP3 vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982 toc12
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900880860840
26
27
28
29
30
31
32
25
820 920
TA = -40°C
TA = +25°C
TA = +85°C
fIF = 120MHz
INPUT IP3 vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc13
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900880860840
27.0
27.5
28.0
26.5
820 920
fIF = 100MHz
PLO = 0dBm
PLO = +5dBm
PLO = -5dBm
INPUT P1dB vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc16
RF FREQUENCY (MHz)
INPUT P1dB (dBm)
900880860840
12.5
13.0
13.5
14.0
12.0
820 920
TA = -40°CTA = +25°C
TA = +85°C
fIF = 100MHz
INPUT IP3 vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982 toc14
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900880860840
26
27
28
29
30
25
820 920
fIF = 120MHz
PLO = 0dBm
PLO = -5dBm
PLO = +5dBm
INPUT IP3 vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc15
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900880860840
26.5
27.0
27.5
28.0
26.0
820 920
VCC = 5.25V
VCC = 5.0V
VCC = 4.75V
fIF = 100MHz
INPUT P1dB vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982 toc17
RF FREQUENCY (MHz)
INPUT P1dB (dBm)
900880860840
13.5
14.0
14.5
15.0
15.5
16.0
13.0
820 920
TA = -40°C
TA = +25°C
TA = +85°C
fIF = 120MHz
INPUT P1dB vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc18
RF FREQUENCY (MHz)
INPUT P1dB (dBm)
900880860840
12.75
13.00
13.25
13.50
12.50
820 920
PLO = -5dBm
PLO = +5dBm PLO = 0dBm
fIF = 100MHz
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA= +25°C, unless otherwise noted.)
INPUT P1dB vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc19
RF FREQUENCY (MHz)
INPUT P1dB (dBm)
900880860840
12.5
13.0
13.5
14.0
12.0
820 920
fIF = 100MHz
VCC = 5.25V
VCC = 4.75V
VCC = 5V
LO SWITCH ISOLATION vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc20
RF FREQUENCY (MHz)
LO SWITCH ISOLATION (dB)
900880860840
50
51
52
53
54
49
820 920
TA = -40°C
TA = +25°C
TA = +85°C
LO OFFSET 1MHz
fIF = 100MHz
LO SWITCH ISOLATION vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982 toc21
RF FREQUENCY (MHz)
LO SWITCH ISOLATION (dB)
900880860840
51
52
53
54
55
50
820 920
LO OFFSET 1MHz
fIF = 120MHz
TA = -40°C
TA = +25°C
TA = +85°C
LO SWITCH ISOLATION vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc22
RF FREQUENCY (MHz)
LO SWITCH ISOLATION (dB)
900880860840
50
51
52
53
54
49
820 920
LO OFFSET 1MHz
fIF = 100MHz
PLO = -5dBm
PLO = 0dBm
PLO = +5dBm
LO LEAKAGE AT RF PORT
vs. LO FREQUENCY
MAX9982 toc25
LO FREQUENCY (MHz)
LO LEAKAGE (dBm)
1000900800
-46
-44
-42
-40
-38
-48
700 1100
PLO = +5dBm
PLO = -5dBm
PLO = 0dBm
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
MAX9982 toc23
LO FREQUENCY (MHz)
LO LEAKAGE (dBm)
1025925825
-42.5
-40.0
-37.5
-35.0
-32.5
-30.0
-45.0
725 1125
TA = -40°C
TA = +25°C
TA = +85°C
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
MAX9982 toc24
LO FREQUENCY (MHz)
LO LEAKAGE (dBm)
1025925825
-50
-40
-30
-20
-60
725 1125
PLO = +5dBm
PLO = 0dBm
PLO = -5dBm
RF LEAKAGE AT IF PORT
vs. RF FREQUENCY
MAX9982 toc26
RF FREQUENCY (MHz)
RF LEAKAGE (dBc)
900880860840
-20
-18
-16
-14
-12
-10
-22
820 920
TA = -40°C
TA = +25°C
TA = +85°C
RF LEAKAGE AT IF PORT
vs. RF FREQUENCY
MAX9982 toc27
RF FREQUENCY (MHz)
RF LEAKAGE (dBc)
900880860840
-18
-16
-14
-12
-10
-20
820 920
PLO = -5dBm, 0dBm, +5dBm
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(Typical Application Circuit, VCC = 5V, fIF = 100MHz, PRF = -5dBm, PLO = 0dBm, TA= +25°C, unless otherwise noted.)
NOISE FIGURE vs. RF FREQUENCY
LOW-SIDE INJECTION
MAX9982 toc28
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
900880860840
10
11
12
13
14
9
820 920
TA = -40°C
TA = +25°C
SINGLE SIDEBAND TA = +85°C
NOISE FIGURE vs. RF FREQUENCY
HIGH-SIDE INJECTION
MAX9982 toc29
RF FREQUENCY (MHz)
NOISE FIGURE (dB)
900880860840
12
13
14
15
16
11
820 920
SINGLE SIDEBAND
TA = +25°C
TA = -40°C
TA = +85°C
RF RETURN LOSS
vs. RF FREQUENCY
MAX9982 toc30
RF FREQUENCY (MHz)
RETURN LOSS (dB)
900880860840
25
20
15
10
5
0
30
820 920
PLO = -5dBm, 0dBm, +5dBm
LO RETURN LOSS
vs. LO FREQUENCY
MAX9982 toc31
LO FREQUENCY (MHz)
RETURN LOSS (dB)
1000900800
25
20
15
10
5
0
30
700 1100
MEASURED ON LO1 PORT
LOSEL IS LOGIC HIGH (LO1 INPUT SELECTED)
PLO = 0dBm
PLO = -5dBm
PLO = +5dBm
IF RETURN LOSS
vs. IF FREQUENCY
MAX9982 toc32
IF FREQUENCY (MHz)
RETURN LOSS (dB)
15013011090
25
20
15
10
5
0
30
70 170
IF MATCH IS TUNED FOR 70MHz. MATCHING
FOR HIGHER FREQUENCIES IS POSSIBLE.
MAX9982
Detailed Description
The MAX9982 downconverter mixer is designed for
GSM and CDMA base station receivers with an RF fre-
quency 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 addi-
tional IF amplifier. The mixer has excellent input IP3
measuring +26.8dBm. The device also features inte-
grated RF and LO baluns that allow the mixers to be
driven with single-ended signals.
RF Inputs
The MAX9982 has one input (RF) that is internally
matched to 50Ωrequiring no external matching compo-
nents. 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
8 _______________________________________________________________________________________
PIN NAME FUNCTION
1 RF RF Input. This input is internally matched to 50Ω and is DC shorted to ground.
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 Bias control for the mixer. Connect a 249Ω resistor from this pin to ground to set the bias
current for the mixer.
6, 10 VCC
Power-Supply Connections. Connect a 0.1µF bypass capacitor from each VCC pin to ground.
8 LOSEL Local Oscillator Select. Set this pin to logic HIGH to select LO1; set to logic LOW to select
LO2.
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.
Pin Description
Table 1. Component List
COMPONENT VALUE SIZE PART
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) —Mini-Circuits TC4-1W-7A
U1 —20-pin 5mm x 5mm QFN MAX9982ETP
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.
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 Appli-
cation Circuit for recommended component values for an
IF optimized for 70MHz to 100MHz. Higher IF frequen-
cies 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 249Ωsets
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 induc-
tance. 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 high-
frequency 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
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
_______________________________________________________________________________________ 9
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
10 ______________________________________________________________________________________
20
19
18
17
GND
IF+
IF-
GND
16 GND
13
12
11
14
15
GND
GND
GND
LO2 LO2
LO1
LO1
4
3
2
1
RFBIAS
TAP
RF
RFIN
5
GND
LO SELECT
GND
6
7
8
9
VCC
VCC
GND
GND
LOSEL
10
MAX9982
IF OUT
4:1 (200:50)
TRANSFORMER
41
2
5V
3
C9
C10
C7
C6
C11
C8
R3L1
R4L2
T1 6
5V5V
C5C4
R1
C2
C1
C3
Typical Application Circuit
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
______________________________________________________________________________________ 11
QFN THIN.EPS
D2
(ND-1) X e
e
D
C
PIN # 1
I.D.
(NE-1) X e
E/2
E
0.08 C
0.10 C
A
A1 A3
DETAIL A
0.15 C B
0.15 C A
DOCUMENT CONTROL NO.
21-0140
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
PROPRIETARY INFORMATION
APPROVAL
TITLE:
C
REV.
2
1
E2/2
E2
0.10 M C A B
PIN # 1 I.D.
b
0.35x45
L
D/2 D2/2
L
C
L
C
e e
L
CC
L
k
k
L
L
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
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.
2
2
21-0140
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
COMMON DIMENSIONS EXPOSED PAD VARIATIONS
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.
9. DRAWING CONFORMS TO JEDEC MO220.
NOTES:
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
C
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
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.)
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