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MAX9982ETP+D

P1-P3P4-P6P7-P9P10-P12
MAX9982
825MHz to 915MHz, SiGe High-Linearity
Active Mixer
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(Typical Application Circuit, V
CC
= 5V, f
IF
= 100MHz, P
RF
= -5dBm, P
LO
= 0dBm, T
A
= +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
T
A
= -40°C
T
A
= +25°C
SINGLE SIDEBAND
T
A
= +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
T
A
= +25°C
T
A
= -40°C
T
A
= +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
P
LO
= -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)
P
LO
= 0dBm
P
LO
= -5dBm
P
LO
= +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 50Ω requiring 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 V
CC
Power-Supply Connections. Connect a 0.1µF bypass capacitor from each V
CC
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 V
CC
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 V
CC
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 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 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 V
CC
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
P1-P3P4-P6P7-P9P10-P12

MAX9982ETP+D

Mfr. #:
Buy MAX9982ETP+D
Manufacturer:
Maxim Integrated
Description:
RF Mixer 825-915MHz Dual SiGe Active Mixer
Lifecycle:
New from this manufacturer.
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