MAXIM MAX9986ETP

KIT
ATION
EVALU
E
L
B
A
IL
AVA
19-3605; Rev 0; 2/05
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
Features
The MAX9986 high-linearity downconversion mixer provides 10dB gain, +23.6dBm IIP3, and 9.3dB NF for
815MHz to 995MHz 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 MAX9986.
In addition to offering excellent linearity and noise performance, the MAX9986 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 MAX9986 requires a nominal LO drive of 0dBm, and
supply current is guaranteed to be below 265mA.
The MAX9984/MAX9986 are pin compatible with the
MAX9994/MAX9996 1700MHz to 2200MHz mixers,
making this entire family of downconverters ideal for
applications where a common PC board layout is used
for both frequency bands. The MAX9986 is also functionally compatible with the MAX9993.
The MAX9986 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 995MHz RF Frequency Range
♦ 960MHz to 1180MHz LO Frequency Range
(MAX9986)
♦ 570MHz to 850MHz LO Frequency Range
(MAX9984)
♦ 50MHz to 250MHz IF Frequency Range
♦ 10dB Conversion Gain
♦ +23.6dBm Input IP3
♦ +12dBm Input 1dB Compression Point
♦ 9.3dB Noise Figure
♦ 67dBc 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 2200MHz 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
850MHz W-CDMA Base Stations
GSM 850/GSM 900 2G and 2.5G EDGE Base
Stations
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
cdmaOne™ and cdma2000® Base Stations
iDEN® Base Stations
Predistortion Receivers
MAX9986ETP
-40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986ETP-T
-40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986ETP+D
-40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
MAX9986ETP+TD -40°C to +85°C
20 Thin QFN-EP*
T2055-3
5mm × 5mm
Fixed Broadband Wireless Access
Wireless Local Loop
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. D = Dry pack. 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
MAX9986
General Description
MAX9986
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
ABSOLUTE MAXIMUM RATINGS
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
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
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
(MAX9986 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
222
265
mA
0.8
V
2
V
AC ELECTRICAL CHARACTERISTICS
(MAX9986 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 995MHz, 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
995
(Note 2)
960
1180
MAX9984
570
850
IF Frequency Range
fIF
(Note 2)
50
Conversion Gain
GC
TC = +25°C
9
250
10
11
MHz
MHz
dB
Gain Variation Over Temperature
TC = -40°C to +85°C
-0.007
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
12
dBm
23.6
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
21
TC = +25°C to -40°C
-1.7
TC = +25°C to +85°C
+1.0
_______________________________________________________________________________________
dB
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
(MAX9986 Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources,
+3dBm, PRF = -5dBm, fRF = 815MHz to 995MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40°C
otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF
+25°C, unless otherwise noted.) (Note 1)
PARAMETER
Noise Figure
SYMBOL
NF
CONDITIONS
Single sideband, fIF = 190MHz
fRF = 900MHz (no signal)
fLO = 1090MHz
fBLOCKER = 990MHz
fIF = 190MHz
(Note 4)
Noise Figure Under-Blocking
MIN
PBLOCKER =
+8dBm
2LO-2RF
3x3
3LO-3RF
dB
dB
24
0.3
dB
2
-3
2x2
UNITS
19
PBLOCKER =
+11dBm
LO Drive
Spurious Response at IF
MAX
9.3
PBLOCKER =
PFUNDAMENTAL = -5dBm +8dBm
fFUNDAMENTAL = 910MHz
PBLOCKER =
fBLOCKER = 911MHz
+11dBm
Small-Signal Compression
Under-Blocking Condition
TYP
PLO = -3dBm to
to +85°C, unless
= 160MHz, TC =
+3
PRF = -10dBm
67
PRF = -5dBm
62
PRF = -10dBm
87
PRF = -5dBm
77
LO2 selected
42
49
LO1 selected
42
50
dBm
dBc
LO1 to LO2 Isolation
PLO = +3dBm
TC = +25°C (Note 5)
LO Leakage at RF Port
PLO = +3dBm
-47
dBm
LO Leakage at IF Port
PLO = +3dBm
-30
dBm
46
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
27
LO1/2 port unselected,
LO2/1 and IF terminated
26
LO driven at 0dBm, RF terminated into 50Ω,
differential 200Ω
22
LO Port Return Loss
IF Port Return Loss
dB
dB
dB
Note 1:
Note 2:
Note 3:
Note 4:
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.
_______________________________________________________________________________________
3
MAX9986
AC ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(MAX9986 Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
10
9
TC = +25°C
TC = +85°C
8
10
PLO = -3dBm, 0dBm, +3dBm
9
7
740
790
840
890
940
990
1040
MAX9986 toc03
VCC = 4.75V, 5.0V, 5.25V
790
840
890
940
990
740
1040
790
840
RF FREQUENCY (MHz)
INPUT IP3 vs. RF FREQUENCY
INPUT IP3 vs. RF FREQUENCY
25
24
TC = +25°C
VCC = 4.75V
25
1040
24
INPUT IP3 (dBm)
INPUT IP3 (dBm)
22
990
INPUT IP3 vs. RF FREQUENCY
24
23
940
26
MAX9986 toc05
TC = +85°C
25
890
RF FREQUENCY (MHz)
26
MAX9986 toc04
26
TC = -25°C
9
7
740
RF FREQUENCY (MHz)
21
10
8
8
7
INPUT IP3 (dBm)
11
CONVERSION GAIN (dB)
11
CONVERSION GAIN (dB)
CONVERSION GAIN (dB)
TC = -25°C
CONVERSION GAIN vs. RF FREQUENCY
12
MAX9986 toc02
MAX9986 toc01
TC = -40°C
11
CONVERSION GAIN vs. RF FREQUENCY
12
MAX9986 toc06
CONVERSION GAIN vs. RF FREQUENCY
12
23
PLO = +3dBm, 0dBm, -3dBm
22
23
22
21
21
20
20
VCC = 5.25V
VCC = 5.0V
TC = -40°C
19
19
19
840
890
940
990
1040
740
RF FREQUENCY (MHz)
TC = +85°C
TC = +25°C
940
990
1040
740
790
840
IF = 190MHz
NOISE FIGURE (dB)
11
9
TC = -40°C
890
940
990
1040
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
10
8
890
12
MAX9986 toc07
IF = 190MHz
11
840
RF FREQUENCY (MHz)
NOISE FIGURE vs. RF FREQUENCY
12
790
NOISE FIGURE vs. RF FREQUENCY
12
10
IF = 190MHz
11
NOISE FIGURE (dB)
790
MAX9986 toc08
740
9
PLO = +3dBm, 0dBm, -3dBm
8
MAX9986 toc09
20
NOISE FIGURE (dB)
MAX9986
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
10
9
VCC = 4.75V, 5.0V, 5.25V
8
TC = -25°C
7
7
6
6
760
820
880
940
RF FREQUENCY (MHz)
4
7
1000
6
760
820
880
940
RF FREQUENCY (MHz)
1000
760
820
880
940
RF FREQUENCY (MHz)
_______________________________________________________________________________________
1000
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
2LO-2RF RESPONSE vs. RF FREQUENCY
60
TC = +25°C
55
65
PLO = -3dBm
60
55
790
840
890
940
990
790
3LO-3RF RESPONSE vs. RF FREQUENCY
TC = +25°C
80
75
70
TC = -25°C
65
940
990
1040
740
55
940
990
85
80
75
70
PLO = -3dBm, 0dBm, +3dBm
65
1040
PRF = -5dBm
790
840
890
940
990
TC = -25°C
9
8
840
890
940
RF FREQUENCY (MHz)
VCC = 4.75V, 5.0V, 5.25V
65
740
790
990
1040
890
940
990
1040
14
MAX9986 toc17
13
12
PLO = -3dBm, 0dBm, +3dBm
11
840
INPUT P1dB vs. RF FREQUENCY
10
VCC = 5.25V
13
12
11
VCC = 4.75V
VCC = 5.0V
10
9
8
790
70
1040
9
740
75
RF FREQUENCY (MHz)
14
INPUT P1dB (dBm)
TC = +85°C
11
10
80
INPUT P1dB vs. RF FREQUENCY
12
TC = -40°C
85
RF FREQUENCY (MHz)
MAX9986 toc16
TC = +25°C
1040
55
740
INPUT P1dB vs. RF FREQUENCY
13
990
60
RF FREQUENCY (MHz)
14
940
90
INPUT P1dB (dBm)
890
890
3LO-3RF RESPONSE vs. RF FREQUENCY
55
840
840
95
60
790
790
RF FREQUENCY (MHz)
PRF = -5dBm
60
INPUT P1dB (dBm)
890
90
TC = -40°C
740
VCC = 5.0V
3LO-3RF RESPONSE vs. RF FREQUENCY
3LO-3RF RESPONSE (dBc)
3LO-3RF RESPONSE (dBc)
TC = +85°C
840
95
MAX9986 toc13
PRF = -5dBm
90
85
VCC = 4.75V
55
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
95
60
45
740
1040
3LO-3RF RESPONSE (dBc)
740
65
50
45
45
VCC = 5.25V
70
50
50
MAX9986 toc12
PLO = +3dBm
70
PRF = -5dBm
MAX9986 toc15
TC = -40°C, -25°C
PLO = 0dBm
MAX9986 toc18
65
PRF = -5dBm
MAX9986 toc14
2LO-2RF RESPONSE (dBc)
70
2LO-2RF RESPONSE (dBc)
TC = +85°C
2LO-2RF RESPONSE vs. RF FREQUENCY
75
2LO-2RF RESPONSE (dBc)
MAX9986 toc10
PRF = -5dBm
75
MAX9986 toc11
2LO-2RF RESPONSE vs. RF FREQUENCY
75
8
740
790
840
890
940
RF FREQUENCY (MHz)
990
1040
740
790
840
890
940
990
1040
RF FREQUENCY (MHz)
_______________________________________________________________________________________
5
MAX9986
Typical Operating Characteristics (continued)
(MAX9986 Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
Typical Operating Characteristics (continued)
(MAX9986 Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
LO SWITCH ISOLATION
vs. LO FREQUENCY
55
TC = -40°C, -25°C
50
45
TC = +85°C
55
50
PLO = -3dBm, 0dBm, +3dBm
45
60
MAX9986 toc21
MAX9986 toc20
60
LO SWITCH ISOLATION (dB)
MAX9986 toc19
LO SWITCH ISOLATION (dB)
60
LO SWITCH ISOLATION
vs. LO FREQUENCY
LO SWITCH ISOLATION (dB)
LO SWITCH ISOLATION
vs. LO FREQUENCY
55
50
VCC = 4.75V, 5.0V, 5.25V
45
TC = +25°C
40
40
950
1000
1050
1100
1150
1000
1050
1100
1150
1200
900
1050
1100
1150
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
-30
TC = +85°C
-20
-25
PLO = -3dBm
-30
-35
1000
1050
1100
PLO = +3dBm
1150
1200
-15
-20
VCC = 5.25V
-25
VCC = 5.0V
-30
-35
TC = +25°C
VCC = 4.75V
PLO = 0dBm
-40
950
-40
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, -25°C
-50
TC = +25°C
TC = +85°C
-60
-50
-60
950
1000
1050
1100
LO FREQUENCY (MHz)
1150
1200
1200
MAX9986 toc27
MAX9986 toc26
PLO = -3dBm, 0dBm, +3dBm
-40
-30
LO LEAKAGE AT RF PORT (dBm)
-40
-30
LO LEAKAGE AT RF PORT (dBm)
MAX9986 toc25
-30
1200
MAX9986 toc24
-15
-10
LO LEAKAGE AT IF PORT (dBm)
TC = -40°C, -25°C
-10
MAX9986 toc23
MAX9986 toc22
-25
900
1000
LO LEAKAGE AT IF PORT
vs. LO FREQUENCY
-20
900
950
LO FREQUENCY (MHz)
-40
6
950
LO FREQUENCY (MHz)
-15
-35
40
900
LO FREQUENCY (MHz)
-10
LO LEAKAGE AT IF PORT (dBm)
1200
LO LEAKAGE AT IF PORT (dBm)
900
LO LEAKAGE AT RF PORT (dBm)
MAX9986
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
VCC = 4.75V, 5.0V, 5.25V
-40
-50
-60
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 995MHz
Downconversion Mixer with LO Buffer/Switch
RF-TO-IF ISOLATION
vs. RF FREQUENCY
45
40
TC = -40°C, -25°C
35
45
PLO = +3dBm
40
35
30
790
840
890
940
990
1040
40
30
740
790
840
890
940
990
1040
740
790
840
890
940
990
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
RF PORT RETURN LOSS
vs. RF FREQUENCY
IF PORT RETURN LOSS
vs. IF FREQUENCY
LO SELECTED RETURN LOSS
vs. LO FREQUENCY
15
20
25
30
35
10
15
20
25
30
VCC = 4.75V, 5.0V, 5.25V
35
40
860
920
980
1040
1100
50
100
150
RF FREQUENCY (MHz)
200
250
300
MAX9986 toc33
PLO = -3dBm
PLO = 0dBm
40
700
350
800
240
VCC = 5.25V
SUPPLY CURRENT (mA)
10
900
1000
1100
1200
1300
LO FREQUENCY (MHz)
SUPPLY CURRENT
vs. TEMPERATURE (TC)
MAX9986 toc34
0
LO UNSELECTED RETURN LOSS (dB)
30
IF FREQUENCY (MHz)
LO UNSELECTED RETURN LOSS
vs. LO FREQUENCY
PLO = -3dBm, 0dBm, +3dBm
20
PLO = +3dBm
20
50
40
800
10
30
MAX9986 toc35
PLO = -3dBm, 0dBm, +3dBm
LO SELECTED RETURN LOSS (dB)
IF PORT RETURN LOSS (dB)
5
1040
0
MAX9986 toc32
0
MAX9986 toc31
5
740
45
RF FREQUENCY (MHz)
0
10
50
35
30
740
RF PORT RETURN LOSS (dB)
PLO = -3dBm
50
VCC = 4.75V, 5.0V, 5.25V
55
RF-TO-IF ISOLATION (dB)
TC = +25°C
50
PLO = 0dBm
55
60
MAX9986 toc29
TC = +85°C
RF-TO-IF ISOLATION (dB)
55
RF-TO-IF ISOLATION (dB)
60
MAX9986 toc28
60
RF-TO-IF ISOLATION
vs. RF FREQUENCY
MAX9986 toc30
RF-TO-IF ISOLATION
vs. RF FREQUENCY
230
220
210
40
VCC = 4.75V
50
VCC = 5.0V
200
700
800
900
1000
1100
LO FREQUENCY (MHz)
1200
1300
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
7
MAX9986
Typical Operating Characteristics (continued)
(MAX9986 Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.)
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
MAX9986
Pin Description
PIN
NAME
FUNCTION
Power-Supply Connection. Bypass each VCC pin to GND with capacitors as shown in the Typical
Application Circuit.
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
15
LO2
Local Oscillator Input 2. Drive LOSEL high to select LO2.
16
LEXT
External Inductor Connection. Connect a low-ESR, 30nH inductor from LEXT to GND. This inductor
carries approximately 140mA DC current.
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
Local Oscillator Input 1. Drive LOSEL low to select LO1.
Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias.
Detailed Description
The MAX9986 high-linearity downconversion mixer
provides 10dB of conversion gain and +23.6dBm of
IIP3, with a typical 9.3dB noise figure. The integrated
baluns and matching circuitry allow for 50Ω singleended 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 MAX9986’s
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 W-CDMA 2G/2.5G/3G base stations. The MAX9986 is specified to operate over a
815MHz to 995MHz 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.
8
RF Input and Balun
The MAX9986 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 MAX9986 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 MAX9986 includes an internal
LO SPDT switch that can be used for frequency-hopping 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 a 82pF DCblocking capacitor.
_______________________________________________________________________________________
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
optimize the performance for a particular frequency
band. Since approximately 140mA flows through this
inductor, it is important to use a low-DCR wire-wound coil.
If the LO-to-IF and RF-to-IF leakage are not critical
parameters, the inductor can be replaced by a short
circuit to ground.
High-Linearity Mixer
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 MAX9986 Evaluation Kit can be used as a
reference for board layout. Gerber files are available
upon request at www.maxim-ic.com.
The core of the MAX9986 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 23.6dBm, 67dBc, and 9.3dB,
respectively.
Differential IF Output Amplifier
The MAX9986 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.
Layout Considerations
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.
Exposed Pad RF/Thermal Considerations
The exposed paddle (EP) of the MAX9986’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 MAX9986 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.
Chip Information
TRANSISTOR COUNT: 1017
PROCESS: SiGe BiCMOS
LEXT Inductor
LEXT serves to improve the LO-to-IF and RF-to-IF leakage. The inductance value can be adjusted by the user to
_______________________________________________________________________________________
9
MAX9986
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.
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)
Microwave capacitor (0603)
C1
10pF
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
3.57Ω
±1% resistor (1206)
T1
4:1 balun
IF balun
U1
MAX9986
Maxim IC
IFBIAS
IF+
IF-
GND
LEXT
Pin Configuration/Functional Diagram
20
19
18
17
16
VCC 1
15 LO2
RF 2
MAX9986
14 VCC
GND 5
11 LO1
6
7
8
9
10
GND
12 GND
LOSEL
GND 4
VCC
13 GND
LOBIAS
TAP 3
VCC
MAX9986
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
THIN QFN
10
______________________________________________________________________________________
SiGe High-Linearity, 815MHz to 995MHz
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
MAX9986
2
14
3
13
4
12
LO2
LO2
INPUT
VCC
VCC
C11
GND
GND
C10
5
11
LOSEL
LOBIAS
VCC
9
LO1
LO1
INPUT
10
GND
8
7
6
VCC
GND
R2
VCC
C6
LOSEL
INPUT
C7
C8
VCC
C9
______________________________________________________________________________________
11
MAX9986
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
MAX9986
SiGe High-Linearity, 815MHz to 995MHz
Downconversion Mixer with LO Buffer/Switch
D2
D
MARKING
b
C
L
0.10 M C A B
D2/2
D/2
k
L
XXXXX
E/2
E2/2
C
L
(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
C
L
C
L
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
21-0140
-DRAWING NOT TO SCALE-
COMMON DIMENSIONS
A1
A3
b
D
E
e
k
L
L1
N
ND
NE
JEDEC
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
0.20 REF.
0.20 REF.
0.25 0.30 0.35 0.25 0.30 0.35
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.
0.25 - 0.25 -
0
0.02 0.05
0
0.02 0.05
0.20 REF.
0.20 REF.
0.20 0.25 0.30 0.20 0.25 0.30
4.90 5.00 5.10 4.90 5.00 5.10
4.90 5.00 5.10 4.90 5.00 5.10
0.50 BSC.
0.50 BSC.
- 0.25
0.25 -
0
0.02 0.05
0.20 REF.
0.15 0.20 0.25
4.90 5.00 5.10
4.90 5.00 5.10
0.40 BSC.
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
- 0.30 0.40 0.50
16
4
4
20
5
5
WHHB
WHHC
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
H
28
7
7
WHHD-1
32
8
8
40
10
10
WHHD-2
-----
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.
D2
L
E2
PKG.
CODES
MIN.
NOM. MAX.
T1655-1
T1655-2
T1655N-1
3.00
3.00
3.00
3.10 3.20 3.00
3.10 3.20 3.00
3.10 3.20 3.00
3.10
3.10
3.10
3.20
3.20
3.20
T2055-2
T2055-3
T2055-4
3.00
3.00
3.00
3.10 3.20 3.00
3.10 3.20 3.00
3.10 3.20 3.00
3.10
3.10
3.10
3.20
3.20
3.20
T2055-5
T2855-1
T2855-2
T2855-3
T2855-4
T2855-5
T2855-6
T2855-7
T2855-8
T2855N-1
T3255-2
T3255-3
T3255-4
T3255N-1
3.15
3.15
2.60
3.15
2.60
2.60
3.15
2.60
3.15
3.15
3.00
3.00
3.00
3.00
3.25
3.25
2.70
3.25
2.70
2.70
3.25
2.70
3.25
3.25
3.10
3.10
3.10
3.10
3.15
3.15
2.60
3.15
2.60
2.60
3.15
2.60
3.15
3.15
3.00
3.00
3.00
3.00
3.25
3.25
2.70
3.25
2.70
2.70
3.25
2.70
3.25
3.25
3.10
3.10
3.10
3.10
3.35
3.35
2.80
3.35
2.80
2.80
3.35
2.80
3.35
3.35
3.20
3.20
3.20
3.20
T4055-1
3.20
3.30 3.40 3.20
3.30
3.40
3.35
3.35
2.80
3.35
2.80
2.80
3.35
2.80
3.35
3.35
3.20
3.20
3.20
3.20
MIN.
NOM. MAX.
±0.15
**
**
**
**
**
**
0.40
DOWN
BONDS
ALLOWED
NO
YES
NO
NO
YES
NO
YES
**
NO
NO
YES
YES
NO
**
**
0.40
**
**
**
**
**
NO
YES
YES
NO
NO
YES
NO
NO
**
YES
**
**
**
**
** SEE COMMON DIMENSIONS TABLE
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 T2855-1,
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-
H
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
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.