KIT
ATION
EVALU
E
L
B
A
IL
AVA
19-3906; Rev 0; 1/06
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
Features
The MAX9986A high-linearity downconversion mixer
provides 8.2dB gain, +25dBm IIP3, and 10dB NF for
815MHz to 1000MHz base-station receiver applications. With a 960MHz to 1180MHz LO frequency range,
this particular mixer is ideal for high-side LO injection
receiver architectures. Low-side LO injection is supported by the MAX9984, which is pin-for-pin and functionally compatible with the MAX9986A.
In addition to offering excellent linearity and noise performance, the MAX9986A also yields a high level of component integration. This device includes a double-balanced
passive mixer core, an IF amplifier, a dual-input LO selectable switch, and an LO buffer. On-chip baluns are also
integrated to allow for single-ended RF and LO inputs.
The MAX9986A requires a nominal LO drive of 0dBm,
and supply current is guaranteed to be below 250mA.
The MAX9986A is a derivative version of the MAX9986
with improved large-signal blocking performance. The
MAX9984/MAX9986/MAX9986A are pin compatible with
the MAX9994/MAX9996 1700MHz to 3000MHz mixers,
making this entire family of downconverters ideal for
applications where a common PC board layout is used
for both frequency bands. The MAX9986A is also functionally compatible with the MAX9993.
The MAX9986A is available in a compact, 20-pin, thin
QFN package (5mm x 5mm) with an exposed paddle.
Electrical performance is guaranteed over the extended
-40°C to +85°C temperature range.
♦ 815MHz to 1000MHz RF Frequency Range
♦ 960MHz to 1180MHz LO Frequency Range
(MAX9986A/MAX9986)
♦ 570MHz to 850MHz LO Frequency Range
(MAX9984)
♦ 50MHz to 250MHz IF Frequency Range
♦ 8.2dB Conversion Gain
♦ +25dBm Input IP3
♦ +14.8dBm Input 1dB Compression Point
♦ 10dB Noise Figure
♦ 69dBc 2LO - 2RF Spurious Rejection at
PRF = -10dBm
♦ Integrated LO Buffer
♦ Integrated RF and LO Baluns for Single-Ended
Inputs
♦ Low -3dBm to +3dBm LO Drive
♦ Built-In SPDT LO Switch with 49dB LO1 to LO2
Isolation and 50ns Switching Time
♦ Pin Compatible with MAX9994/MAX9996 1700MHz
to 3000MHz Mixers
♦ Functionally Compatible with MAX9993
♦ External Current-Setting Resistors Provide Option
for Operating Mixer in Reduced Power/Reduced
Performance Mode
♦ Lead-Free Package Available
Applications
Ordering Information
850MHz WCDMA Base Stations
GSM 850/GSM 900 2G and 2.5G EDGE Base
Stations
cdmaOne™ and cdma2000® Base Stations
iDEN® Base Stations
Predistortion Receivers
Fixed Broadband Wireless Access
PART
TEMP RANGE PIN-PACKAGE
-40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986AETP-T -40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986AETP+
-40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986AETP+T -40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986AETP
Wireless Local Loops
Private Mobile Radios
Military Systems
Microwave Links
Digital and Spread-Spectrum Communication
Systems
cdma2000 is a registered trademark of the Telecommunications
Industry Association.
cdmaOne is a trademark of CDMA Development Group.
iDEN is a registered trademark of Motorola, Inc.
PKG
CODE
*EP = Exposed paddle.
+ = Lead free.
T = Tape-and-reel.
Pin Configuration/Functional Diagram and Typical
Application Circuit appear at end of data sheet.
________________________________________________________________ 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
MAX9986A
General Description
MAX9986A
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
ABSOLUTE MAXIMUM RATINGS
θJA .................................................................................+38°C/W
θJC .................................................................................+13°C/W
Operating Temperature Range (Note A) ....TC = -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
VCC to GND ...........................................................-0.3V to +5.5V
IF+, IF-, LOBIAS, LOSEL, IFBIAS to GND...-0.3V to (VCC + 0.3V)
TAP ........................................................................-0.3V to +1.4V
LO1, LO2, LEXT to GND........................................-0.3V to +0.3V
RF, LO1, LO2 Input Power .............................................+12dBm
RF (RF is DC shorted to GND through a balun) .................50mA
Continuous Power Dissipation (TA = +70°C)
20-Pin Thin QFN-EP (derate 26.3mW/°C above +70°C)...........2.1W
Note A: TC is the temperature on the exposed paddle of the package.
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
(MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, no RF signal applied, IF+ and IF- outputs pulled up to VCC through
inductive chokes, R1 = 953Ω, R2 = 619Ω, TC = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, TC =
+25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Supply Voltage
VCC
Supply Current
ICC
LO_SEL Input-Logic Low
VIL
LO_SEL Input-Logic High
VIH
CONDITIONS
MIN
TYP
MAX
UNITS
4.75
5.00
5.25
V
213
250
mA
0.8
V
2
V
AC ELECTRICAL CHARACTERISTICS
(MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources, PLO = -3dBm to
+3dBm, PRF = -5dBm, fRF = 815MHz to 1000MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40°C to +85°C, unless
otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF = 160MHz, TC =
+25°C, unless otherwise noted.) (Note 1)
PARAMETER
RF Frequency Range
LO Frequency Range
SYMBOL
fRF
fLO
CONDITIONS
MIN
TYP
MAX
UNITS
MHz
(Note 2)
815
1000
(Note 2)
960
1180
MAX9984
570
850
IF Frequency Range
fIF
(Note 2)
50
Conversion Gain
GC
TC = +25°C
7.2
250
8.2
9.3
MHz
MHz
dB
Gain Variation Over Temperature
TC = -40°C to +85°C
-0.009
dB/°C
Conversion Gain Flatness
Flatness over any one of three frequency bands:
fRF = 824MHz to 849MHz
fRF = 869MHz to 894MHz
fRF = 880MHz to 915MHz
±0.15
dB
14.8
dBm
25
dBm
Input Compression Point
Input Third-Order Intercept Point
Input IP3 Variation Over
Temperature
2
P1dB
(Note 3)
IIP3
Two tones:
fRF1 = 910MHz, fRF2 = 911MHz,
PRF = -5dBm/tone, fLO = 1070MHz,
PLO = 0dBm, TA = +25°C
22
TC = +25°C to -40°C
-1.8
TC = +25°C to +85°C
+0.7
_______________________________________________________________________________________
dB
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
(MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources, PLO = -3dBm to
+3dBm, PRF = -5dBm, fRF = 815MHz to 1000MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40°C to +85°C, unless
otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF = 160MHz, TC =
+25°C, unless otherwise noted.) (Note 1)
PARAMETER
Noise Figure
SYMBOL
NF
CONDITIONS
Single sideband, fIF = 190MHz
fRF = 900MHz (no signal)
fLO = 1090MHz
fBLOCKER = 981MHz
fIF = 190MHz
(Note 4)
Noise Figure Under-Blocking
MIN
PBLOCKER =
+8dBm
2LO - 2RF
3x3
3LO - 3RF
dB
dB
23
0.18
dB
0.4
-3
2x2
UNITS
20
PBLOCKER =
+11dBm
LO Drive
Spurious Response at IF
MAX
10
PBLOCKER =
PFUNDAMENTAL = -5dBm +8dBm
fFUNDAMENTAL = 910MHz
PBLOCKER =
fBLOCKER = 911MHz
+11dBm
Small-Signal Compression
Under-Blocking Condition
TYP
PRF = -10dBm
+3
dBm
69
PRF = -5dBm
64
PRF = -10dBm
88
PRF = -5dBm
78
LO2 selected
42
49
LO1 selected
42
50
dBc
LO1-to-LO2 Isolation
PLO = +3dBm
TC = +25°C (Note 5)
LO Leakage at RF Port
PLO = +3dBm
-45
dBm
LO Leakage at IF Port
PLO = +3dBm
-33
dBm
54
dB
50
ns
20
dB
RF-to-IF Isolation
LO Switching Time
50% of LOSEL to IF settled to within 2°
RF Port Return Loss
LO1/2 port selected,
LO2/1 and IF terminated
22
LO1/2 port unselected,
LO2/1 and IF terminated
34
LO driven at 0dBm, RF terminated into 50Ω,
differential 200Ω
22
LO Port Return Loss
IF Port Return Loss
dB
dB
dB
All limits include external component losses. Output measurements taken at IF output of the Typical Application Circuit.
Operation outside this range is possible, but with degraded performance of some parameters.
Compression point characterized. It is advisable not to operate continuously the mixer RF input above +12dBm.
Measured with external LO source noise filtered so the noise floor is -174dBm/Hz. This specification reflects the effects of all
SNR degradations in the mixer, including the LO noise as defined in Maxim Application Note 2021.
Note 5: Guaranteed by design and characterization.
Note 1:
Note 2:
Note 3:
Note 4:
_______________________________________________________________________________________
3
MAX9986A
AC ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
TC = +85°C
6
8
7
PLO = -3dBm, 0dBm, +3dBm
790
840
890
940
990
740
790
840
RF FREQUENCY (MHz)
INPUT IP3 vs. RF FREQUENCY
890
940
990
MAX9986A toc03
740
1040
790
INPUT IP3 vs. RF FREQUENCY
25
24
23
940
990
1040
INPUT IP3 vs. RF FREQUENCY
27
INPUT IP3 (dBm)
26
890
28
MAX9986A toc05
TC = +85°C
840
RF FREQUENCY (MHz)
28
MAX9986A toc04
TC = +25°C
VCC = 4.75V, 5.0V, 5.25V
RF FREQUENCY (MHz)
28
27
7
5
5
1040
26
27
INPUT IP3 (dBm)
740
8
6
6
5
INPUT IP3 (dBm)
9
CONVERSION GAIN (dB)
TC = -25°C
TC = +25°C
7
9
CONVERSION GAIN (dB)
CONVERSION GAIN (dB)
8
10
MAX9986A toc02
MAX9986A toc01
TC = -40°C
9
CONVERSION GAIN vs. RF FREQUENCY
CONVERSION GAIN vs. RF FREQUENCY
10
25
24
PLO = -3dBm, 0dBm, +3dBm
MAX9986A toc06
CONVERSION GAIN vs. RF FREQUENCY
10
VCC = 4.75V
26
25
24
VCC = 5.25V
23
23
22
22
VCC = 5.0V
TC = -25°C
21
21
840
890
940
990
1040
21
740
790
840
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
1040
740
790
PLO = -3dBm, 0dBm
TC = -25°C
7
10
9
890
940
990
1040
NOISE FIGURE vs. RF FREQUENCY
IF = 190MHz
11
NOISE FIGURE (dB)
9
840
RF FREQUENCY (MHz)
12
MAX9986A toc07
TC = +85°C
10
TC = -40°C
990
NOISE FIGURE vs. RF FREQUENCY
11
8
940
RF FREQUENCY (MHz)
12
TC = +25°C
890
12
PLO = +3dBm
8
7
IF = 190MHz
VCC = 5.25V
11
NOISE FIGURE (dB)
790
MAX9986A toc08
740
MAX9986A toc09
TC = -40°C
22
NOISE FIGURE (dB)
MAX9986A
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
10
VCC = 5.0V
9
VCC = 4.75V
8
7
IF = 190MHz
6
6
750
800
850
900
RF FREQUENCY (MHz)
4
950
1000
6
750
800
850
900
RF FREQUENCY (MHz)
950
1000
750
800
850
900
RF FREQUENCY (MHz)
_______________________________________________________________________________________
950
1000
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
65
PLO = -3dBm
55
TC = +25°C
890
940
990
1040
FUNDAMENTAL RF FREQUENCY (MHz)
85
75
TC = +25°C
TC = -40°C
890
940
990
1040
740
65
3LO - 3RF RESPONSE vs. RF FREQUENCY
PRF = -5dBm
55
PLO = 0dBm, +3dBm
85
840
890
940
990
75
PLO = -3dBm
65
1040
13
840
890
940
990
16
INPUT P1dB (dBm)
TC = -25°C
14
TC = -40°C
1040
740
PLO = -3dBm, 0dBm, +3dBm
13
10
RF FREQUENCY (MHz)
990
1040
990
1040
VCC = 5.25V
15
14
VCC = 4.75V
13
11
940
940
16
11
890
890
17
11
840
840
INPUT P1dB vs. RF FREQUENCY
15
14
790
FUNDAMENTAL RF FREQUENCY (MHz)
12
790
MAX9986A toc12
VCC = 4.75V
65
12
740
VCC = 5.0V
75
12
10
1040
VCC = 5.25V
85
INPUT P1dB vs. RF FREQUENCY
15
990
PRF = -5dBm
MAX9986A toc17
TC = +25°C
790
17
MAX9986A toc16
TC = +85°C
940
3LO - 3RF RESPONSE vs. RF FREQUENCY
FUNDAMENTAL RF FREQUENCY (MHz)
INPUT P1dB vs. RF FREQUENCY
16
890
55
740
FUNDAMENTAL RF FREQUENCY (MHz)
17
840
95
55
790
790
FUNDAMENTAL RF FREQUENCY (MHz)
INPUT P1dB (dBm)
3LO - 3RF RESPONSE (dBc)
TC = -25°C
840
95
3LO - 3RF RESPONSE (dBc)
PRF = -5dBm
MAX9986A toc13
3LO - 3RF RESPONSE vs. RF FREQUENCY
TC = +85°C
790
FUNDAMENTAL RF FREQUENCY (MHz)
95
740
VCC = 5.0V
55
45
740
3LO - 3RF RESPONSE (dBc)
840
MAX9986A toc14
790
65
VCC = 4.75V
45
740
VCC = 5.25V
75
PLO = +3dBm
45
INPUT P1dB (dBm)
MAX9986A toc11
PLO = 0dBm
MAX9986A toc15
TC = -40°C
55
75
PRF = -5dBm
MAX9986A toc18
65
PRF = -5dBm
85
2LO - 2RF RESPONSE (dBc)
TC = +85°C
85
2LO - 2RF RESPONSE (dBc)
TC = -25°C
75
MAX9986A toc10
2LO - 2RF RESPONSE (dBc)
PRF = -5dBm
2LO - 2RF RESPONSE vs. RF FREQUENCY
2LO - 2RF RESPONSE vs. RF FREQUENCY
2LO - 2RF RESPONSE vs. RF FREQUENCY
85
VCC = 5.0V
10
740
790
840
890
940
RF FREQUENCY (MHz)
990
1040
740
790
840
890
940
990
1040
RF FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX9986A
Typical Operating Characteristics (continued)
(MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
Typical Operating Characteristics (continued)
(MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
TC = -40°C, -25°C
50
45
TC = +85°C
TC = +25°C
40
800
900
1000
1100
50
PLO = +3dBm
45
1200
40
700
800
900
1000
1100
1200
700
900
1000
1100
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
PLO = -3dBm
-40
PLO = +3dBm
-50
950
1000
1050
1100
1150
1200
VCC = 5.25V
-30
VCC = 4.75V
-40
VCC = 5.0V
-50
900
950
1000
1050
1100
1150
1200
900
950
1000
1050
1100
1150
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
LO LEAKAGE AT RF PORT
vs. LO FREQUENCY
LO LEAKAGE AT RF PORT
vs. LO FREQUENCY
LO LEAKAGE AT RF PORT
vs. LO FREQUENCY
TC = -40°C
-40
TC = +85°C
PLO = +3dBm
PLO = 0dBm
-40
PLO = -3dBm
-50
1000
-30
VCC = 5.25V
-40
VCC = 5.0V
VCC = 4.75V
-50
950
1200
MAX9986A toc27
MAX9986A toc26
-30
-20
LO LEAKAGE AT RF PORT (dBm)
TC = -40°C, -25°C
TC = +25°C
-20
LO LEAKAGE AT RF PORT (dBm)
MAX9986A toc25
-20
1200
MAX9986A toc24
MAX9986A toc23
PLO = 0dBm
-30
-20
LO LEAKAGE AT IF PORT (dBm)
TC = +25°C
LO LEAKAGE AT IF PORT (dBm)
MAX9986A toc22
TC = -40°C
-20
-50
900
800
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
TC = +85°C
-30
VCC = 4.75V, 5.0V, 5.25V
45
LO FREQUENCY (MHz)
-30
900
50
LO FREQUENCY (MHz)
TC = -25°C
-40
55
LO FREQUENCY (MHz)
-20
LO LEAKAGE AT IF PORT (dBm)
55
40
700
1050
1100
LO FREQUENCY (MHz)
6
MAX9986A toc20
PLO = -3dBm, 0dBm
60
MAX9986A toc21
55
LO SWITCH ISOLATION
vs. LO FREQUENCY
60
LO SWITCH ISOLATION (dB)
MAX9986A toc19
LO SWITCH ISOLATION (dB)
60
LO SWITCH ISOLATION
vs. LO FREQUENCY
LO SWITCH ISOLATION (dB)
LO SWITCH ISOLATION
vs. LO FREQUENCY
LO LEAKAGE AT RF PORT (dBm)
MAX9986A
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
1150
1200
-50
900
950
1000
1050
1100
LO FREQUENCY (MHz)
1150
1200
900
950
1000
1050
1100
LO FREQUENCY (MHz)
_______________________________________________________________________________________
1150
1200
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
RF-TO-IF ISOLATION
vs. RF FREQUENCY
L3 = 10nH
-20
-30
50
PLO = +3dBm
RF-TO-IF ISOLATION (dB)
TC = +85°C
L3 = 4.7nH
60
MAX9986A toc29
TC = +25°C
RF-TO-IF ISOLATION (dB)
LO LEAKAGE AT IF PORT (dBm)
L3 = 0Ω
-10
60
MAX9986A toc28
0
RF-TO-IF ISOLATION
vs. RF FREQUENCY
TC = -25°C
TC = -40°C
40
MAX9986A toc30
LO LEAKAGE AT IF PORT
OVER FREQUENCY vs. LEXT
50
PLO = dBm
PLO = -3dBm
40
L3 = 22nH
L3 = 15nH
L3 = 30nH
1000
1050
1100
30
1150
1200
790
840
890
940
990
1040
740
890
940
990
RF FREQUENCY (MHz)
RF-TO-IF ISOLATION
vs. RF FREQUENCY
RF-TO-IF ISOLATION
OVER FREQUENCY vs. LEXT
RF PORT RETURN LOSS
vs. RF FREQUENCY
L3 = 15nH
RF-TO-IF ISOLATION (dB)
60
40
L3 = 22nH
L3 = 30nH
50
40
30
20
L3 = 10nH
L3 = 4.7nH
L3 = 0Ω
0
5
10
15
20
25
35
40
0
840
890
940
990
1040
740
790
840
RF FREQUENCY (MHz)
890
940
990
500
1040
700
RF FREQUENCY (MHz)
1100
1300
1500
LO SELECTED RETURN LOSS
vs. LO FREQUENCY
VCC = 4.75V, 5.0V, 5.25V
20
30
40
50
0
LO SELECTED RETURN LOSS (dB)
MAX9986A toc34
0
10
900
RF FREQUENCY (MHz)
IF PORT RETURN LOSS
vs. IF FREQUENCY
IF PORT RETURN LOSS (dB)
PLO = -3dBm, 0dBm, +3dBm
30
10
30
1040
MAX9986A toc33
MAX9986A toc31
70
VCC = 4.75V, 5.0V, 5.25V
790
840
RF FREQUENCY (MHz)
50
740
790
LO FREQUENCY (MHz)
60
RF-TO-IF ISOLATION (dB)
30
740
10
MAX9986A toc35
950
RF PORT RETURN LOSS (dB)
900
MAX9986A toc32
-40
PLO = +3dBm
PLO = 0dBm
20
30
PLO = -3dBm
40
50
50
100
150
200
250
IF FREQUENCY (MHz)
300
350
600
800
1000
1200
1400
1600
LO FREQUENCY (MHz)
_______________________________________________________________________________________
7
MAX9986A
Typical Operating Characteristics (continued)
(MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
Typical Operating Characteristics (continued)
(MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
LO UNSELECTED RETURN LOSS
vs. LO FREQUENCY
SUPPLY CURRENT vs. TEMPERATURE (TC)
VCC = 5.25V
SUPPLY CURRENT (mA)
10
PLO = -3dBm, 0dBm, +3dBm
20
30
220
210
VCC = 5.0V
VCC = 4.75V
200
40
50
MAX9986A toc37
230
MAX9986A toc36
0
LO UNSELECTED RETURN LOSS (dB)
MAX9986A
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
190
600
800
1000
1200
1400
1600
-40
-15
LO FREQUENCY (MHz)
10
35
60
85
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
1, 6, 8, 14
VCC
2
RF
Single-Ended 50Ω RF Input. This port is internally matched and DC shorted to GND through a balun.
Requires an external DC-blocking capacitor.
3
TAP
Center Tap of the Internal RF Balun. Bypass to GND with capacitors close to the IC, as shown in the
Typical Application Circuit.
4, 5, 10, 12,
13, 17
GND
Ground
7
LOBIAS
Bias Resistor for Internal LO Buffer. Connect a 619Ω ±1% resistor from LOBIAS to the power supply.
9
LOSEL
Local Oscillator Select. Logic control input for selecting LO1 or LO2.
11
LO1
Local Oscillator Input 1. Drive LOSEL low to select LO1.
15
LO2
Local Oscillator Input 2. Drive LOSEL high to select LO2.
16
LEXT
External Inductor Connection. Short LEXT to ground using a 0Ω resistor. For applications requiring
improved RF-to-IF and LO-to-IF isolation, connect a low-ESR inductor from LEXT to GND. See the
Applications Information section regarding stability issues when using an LEXT inductor.
18, 19
IF-, IF+
Differential IF Outputs. Each output requires external bias to VCC through an RF choke (see the
Typical Application Circuit).
20
IFBIAS
IF Bias Resistor Connection for IF Amplifier. Connect a 953Ω ±1% resistor from IFBIAS to GND.
EP
GND
Power-Supply Connection. Bypass each VCC pin to GND with capacitors as shown in the Typical
Application Circuit.
Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias.
Detailed Description
The MAX9986A high-linearity downconversion mixer
provides 8.2dB of conversion gain and +25dBm of
IIP3, with a typical 10dB noise figure. The integrated
baluns and matching circuitry allow for 50Ω single8
ended interfaces to the RF and the two LO ports. A single-pole, double-throw (SPDT) switch provides 50ns
switching time between the two LO inputs with 49dB of
LO-to-LO isolation. Furthermore, the integrated LO
buffer provides a high drive level to the mixer core,
reducing the LO drive required at the MAX9986A’s
_______________________________________________________________________________________
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
RF Input and Balun
The MAX9986A RF input is internally matched to 50Ω,
requiring no external matching components. A DCblocking capacitor is required because the input is internally DC shorted to ground through the on-chip balun.
LO Inputs, Buffer, and Balun
The MAX9986A is ideally suited for high-side LO injection applications with a 960MHz to 1180MHz LO frequency range. For a device with a 570MHz to 850MHz
LO frequency range, refer to the MAX9984 data sheet.
As an added feature, the MAX9986A includes an internal LO SPDT switch that can be used for frequencyhopping applications. The switch selects one of the two
single-ended LO ports, allowing the external oscillator
to settle on a particular frequency before it is switched
in. LO switching time is typically less than 50ns, which
is more than adequate for virtually all GSM applications. If frequency hopping is not employed, set the
switch to either of the LO inputs. The switch is controlled by a digital input (LOSEL): logic-high selects
LO2, logic-low selects LO1. To avoid damage to the
part, voltage must be applied to VCC before digital
logic is applied to LOSEL. LO1 and LO2 inputs are
internally matched to 50Ω, requiring only an 82pF DCblocking capacitor.
A two-stage internal LO buffer allows a wide input
power range for the LO drive. All guaranteed specifications are for an LO signal power from -3dBm to +3dBm.
The on-chip low-loss balun, along with an LO buffer,
drives the double-balanced mixer. All interfacing and
matching components from the LO inputs to the IF outputs are integrated on-chip.
High-Linearity Mixer
The core of the MAX9986A is a double-balanced, highperformance passive mixer. Exceptional linearity is provided by the large LO swing from the on-chip LO buffer.
When combined with the integrated IF amplifiers, the cascaded IIP3, 2LO - 2RF rejection, and NF performance is
typically 25dBm, 69dBc, and 10dB, respectively.
Differential IF Output Amplifier
The MAX9986A mixer has a 50MHz to 250MHz IF frequency range. The differential, open-collector IF output
ports require external pullup inductors to VCC. Note that
these differential outputs are ideal for providing
enhanced 2LO - 2RF rejection performance. Singleended IF applications require a 4:1 balun to transform
the 200Ω differential output impedance to a 50Ω singleended output.
Applications Information
Input and Output Matching
The RF and LO inputs are internally matched to 50Ω. No
matching components are required. RF and LO inputs
require only DC-blocking capacitors for interfacing.
The IF output impedance is 200Ω (differential). For
evaluation, an external low-loss 4:1 (impedance ratio)
balun transforms this impedance down to a 50Ω singleended output (see the Typical Application Circuit).
Bias Resistors
Bias currents for the LO buffer and the IF amplifier are
optimized by fine tuning resistors R1 and R2. If
reduced current is required at the expense of performance, contact the factory for details. If the ±1% bias
resistor values are not readily available, substitute standard ±5% values.
LEXT Inductor
Short LEXT to ground using a 0Ω resistor. For applications requiring improved RF-to-IF and LO-to-IF isolation,
LEXT can be used by connecting a low-ESR inductor
from LEXT to GND. See the Typical Operating
Characteristics on RF-to-IF isolation and LO-to-IF leakage
for various inductor values. However, the load impedance
presented to the mixer must be such that any capacitance from both IF- and IF+ to ground do not exceed several picofarads to ensure stable operating conditions.
Since approximately 140mA flows through LEXT, it is
important to use a low DCR wire-wound inductor.
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 the best performance, route the ground pin
traces directly to the exposed pad under the package.
The PC board exposed pad MUST be connected to the
ground plane of the PC board. It is suggested that multiple vias be used to connect this pad to the lower level
ground planes. This method provides a good RF/thermal conduction path for the device. Solder the exposed
pad on the bottom of the device package to the PC
board. The MAX9986A Evaluation Kit can be used as a
_______________________________________________________________________________________
9
MAX9986A
inputs to a -3dBm to +3dBm range. The IF port incorporates a differential output, which is ideal for providing enhanced IIP2 performance.
Specifications are guaranteed over broad frequency
ranges to allow for use in cellular band GSM,
cdma2000, iDEN, and WCDMA 2G/2.5G/3G base stations. The MAX9986A is specified to operate over a
815MHz to 1000MHz RF frequency range, a 960MHz
to 1180MHz LO frequency range, and a 50MHz to
250MHz IF frequency range. Operation beyond these
ranges is possible; see the Typical Operating
Characteristics for additional details.
reference for board layout. Gerber files are available
upon request at www.maxim-ic.com.
Exposed Pad RF/Thermal Considerations
The exposed paddle (EP) of the MAX9986A’s 20-pin
thin QFN-EP package provides a low thermal-resistance path to the die. It is important that the PC board
on which the MAX9986A is mounted be designed to
conduct heat from the EP. In addition, provide the EP
with a low-inductance path to electrical ground. The EP
MUST be soldered to a ground plane on the PC board,
either directly or through an array of plated via holes.
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass each VCC pin and
TAP with the capacitors shown in the Typical Application
Circuit; see Table 1. Place the TAP bypass capacitor to
ground within 100 mils of the TAP pin.
Table 1. Component List Referring to the Typical Application Circuit
COMPONENT
VALUE
DESCRIPTION
L1, L2
330nH
Wire-wound high-Q inductors (0805)
L3*
30nH
Wire-wound high-Q inductor (0603)
C1
10pF
Microwave capacitor (0603)
C2, C4, C7, C8, C10, C11, C12
82pF
Microwave capacitors (0603)
C3, C5, C6, C9, C13, C14
0.01µF
Microwave capacitors (0603)
C15
220pF
Microwave capacitor (0402)
R1
953Ω
±1% resistor (0603)
R2
619Ω
±1% resistor (0603)
R3
0Ω
±1% resistor (1206)
T1
4:1 balun
IF balun TC4-1W-7A
U1
MAX9986A
Maxim IC
*Use L3 for improved RF-to-IF and LO-to-IF isolation. See the Applications Information section regarding stability issues when using
L3 inductor.
IFBIAS
IF+
IF-
GND
LEXT
Pin Configuration/Functional Diagram
20
19
18
17
16
VCC 1
15 LO2
RF 2
MAX9986A
14 VCC
GND 5
11 LO1
6
7
8
9
10
GND
12 GND
LOSEL
GND 4
VCC
13 GND
LOBIAS
TAP 3
VCC
MAX9986A
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
THIN QFN
10
______________________________________________________________________________________
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
VCC
T1
3
IF
OUTPUT
6
R3
L1
2
L2
C14
C3
C2
GND
IF-
IF+
19
20
VCC
18
17
RF
C5
TAP
C4
GND
16
C12
1
15
C1
RF
INPUT
4
L3*
IFBIAS
VCC
1
C15
R1
LEXT
C13
MAX9986A
2
14
3
13
4
12
5
11
LO2
LO2
INPUT
VCC
VCC
C11
GND
GND
C10
LOSEL
LOBIAS
VCC
9
LO1
INPUT
LO1
10
GND
8
7
6
VCC
GND
R2
VCC
C6
LOSEL
INPUT
C7
C8
VCC
C9
*USE L3 FOR IMPROVED RF-TO-IF AND LO-TO-IF ISOLATION. SEE THE Applications Information SECTION REGARDING STABILITY ISSUES WHEN USING L3 INDUCTOR.
Chip Information
TRANSISTOR COUNT: 1017
PROCESS: SiGe BiCMOS
______________________________________________________________________________________
11
MAX9986A
Typical Application Circuit
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.)
QFN THIN.EPS
MAX9986A
SiGe High-Linearity, 815MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
D2
D
MARKING
b
CL
0.10 M C A B
D2/2
D/2
k
L
AAAAA
E/2
E2/2
CL
(NE-1) X e
E
DETAIL A
PIN # 1
I.D.
E2
PIN # 1 I.D.
0.35x45¡
e/2
e
(ND-1) X e
DETAIL B
e
L1
L
CL
CL
L
L
e
e
0.10 C
A
C
0.08 C
A1 A3
PACKAGE OUTLINE,
16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
-DRAWING NOT TO SCALE-
COMMON DIMENSIONS
A1
A3
b
D
E
e
PKG.
CODES
0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80
0
0.02 0.05
0
0.02 0.05
0
0.02 0.05
1
2
EXPOSED PAD VARIATIONS
PKG.
16L 5x5
20L 5x5
28L 5x5
32L 5x5
40L 5x5
SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.
A
I
21-0140
0
0.02 0.05
0
T1655-2
T1655-3
T1655N-1
T2055-3
D2
3.00
3.00
3.00
3.00
3.00
T2055-4
T2055-5
3.15
T2855-3
3.15
T2855-4
2.60
T2855-5
2.60
3.15
T2855-6
T2855-7
2.60
T2855-8
3.15
T2855N-1 3.15
T3255-3
3.00
T3255-4
3.00
T3255-5
3.00
T3255N-1 3.00
T4055-1
3.20
0.02 0.05
0.20 REF.
0.20 REF.
0.20 REF.
0.20 REF.
0.20 REF.
0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25
4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10
4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10
0.80 BSC.
0.65 BSC.
0.50 BSC.
0.40 BSC.
0.50 BSC.
0.25 - 0.25 - 0.25 - 0.25 - 0.25 0.35 0.45
0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60
L1
- 0.30 0.40 0.50
16
40
N
20
28
32
ND
4
10
5
7
8
4
10
5
7
8
NE
WHHB
----WHHC
WHHD-1
WHHD-2
JEDEC
k
L
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.
L
E2
exceptions
MIN. NOM. MAX. MIN. NOM. MAX. –0.15
3.10
3.10
3.10
3.10
3.10
3.25
3.25
2.70
2.70
3.25
2.70
3.25
3.25
3.10
3.10
3.10
3.10
3.30
3.20
3.20
3.20
3.20
3.20
3.35
3.35
2.80
2.80
3.35
2.80
3.35
3.35
3.20
3.20
3.20
3.20
3.40
3.00
3.00
3.00
3.00
3.00
3.15
3.15
2.60
2.60
3.15
2.60
3.15
3.15
33.00
33.00
3.00
3.00
3.20
3.10
3.10
3.10
3.10
3.10
3.25
3.25
2.70
2.70
3.25
2.70
3.25
3.25
3.10
3.10
3.10
3.10
3.30
3.20
3.20
3.20
3.20
3.20
3.35
3.35
2.80
2.80
3.35
2.80
3.35
3.35
3.20
3.20
3.20
3.20
3.40
**
**
**
**
**
0.40
**
**
**
**
**
0.40
**
**
**
**
**
**
DOWN
BONDS
ALLOWED
YES
NO
NO
YES
NO
YES
YES
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
** SEE COMMON DIMENSIONS TABLE
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, EXCEPT EXPOSED PAD DIMENSION FOR
T2855-3 AND T2855-6.
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", –0.05.
PACKAGE OUTLINE,
16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
21-0140
-DRAWING NOT TO SCALE-
I
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
© 2006 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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