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PDF MAX9985 Data sheet ( Hoja de datos )
| Número de pieza | MAX9985 | |
| Descripción | Downconversion Mixer | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0705 Rev 0; 1/07
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
General Description
The MAX9985 high-linearity, dual-channel downconver-
sion mixer is designed to provide approximately 6dB
gain, +28.5dBm of IIP3, and 10.5dB of noise figure (NF)
ideal for diversity receiver applications. With a 700MHz
to 1000MHz RF frequency range and a 570MHz to
865MHz LO frequency range, this mixer is ideal for low-
side LO injection architectures. In addition, the broad
frequency range makes the MAX9985 ideal for GSM
850/950, 2G/2.5G EDGE, WCDMA, cdma2000®, and
iDEN® base-station applications.
The MAX9985 dual-channel downconverter achieves a
high level of component integration. The MAX9985 inte-
grates two double-balanced active mixer cores, two LO
buffers, a dual-input LO selectable switch, and a pair of
differential IF output amplifiers. In addition, integrated
on-chip baluns at the RF and LO ports allow for single-
ended RF and single-ended LO inputs. The MAX9985
requires a typical 0dBm LO drive. Supply current is
adjustable up to 400mA.
The MAX9985 is available in a 36-pin thin QFN pack-
age (6mm x 6mm) with an exposed paddle. Electrical
performance is guaranteed over the extended tempera-
ture range, from TC = -40°C to +85°C.
Applications
850MHz WCDMA Base Stations
GSM 850/GSM 950, 2G/2.5G EDGE Base
Stations
cdmaOne™ and cdma2000 Base Stations
iDEN Base Stations
Fixed Broadband Wireless Access
Wireless Local Loop
Private Mobile Radios
Military Systems
Digital and Spread-Spectrum Communication
Systems
Microwave Links
cdma2000 is a registered trademark of Telecommunications
Industry Association.
iDEN is a registered trademark of Motorola, Inc.
cdmaOne is a trademark of CDMA Development Group.
Features
o 700MHz to 1000MHz RF Frequency Range
o 570MHz to 865MHz LO Frequency Range
o 50MHz to 250MHz IF Frequency Range
o 6dB Typical Conversion Gain
o 10.5dB Typical Noise Figure
o +28.5dBm Typical Input IP3
o +16.2dBm Typical Input 1dB Compression Point
o 77dBc Typical 2RF-2LO Spurious Rejection at
PRF = -10dBm
o Dual Channels Ideal for Diversity Receiver
Applications
o 47dB Typical Channel-to-Channel Isolation
o -3dBm to +3dBm LO Drive
o Integrated LO Buffer
o Internal RF and LO Baluns for Single-Ended
Inputs
o Built-In SPDT LO Switch with 43dB LO1-to-LO2
Isolation and 50ns Switching Time
o Pin-Compatible with MAX9995/MAX9995A
1700MHz to 2200MHz Mixers
o Lead-Free Package Available
Ordering Information
PART
MAX9985ETX
TEMP RANGE PIN-PACKAGE
PKG
CODE
-40°C to +85°C 36 Thin QFN-EP* T3666-2
(6mm x 6mm)
MAX9985ETX-T
36 Thin QFN-EP*
-40°C to +85°C (6mm x 6mm), T3666-2
T/R
MAX9985ETX+
36 Thin QFN-EP*
-40°C to +85°C (6mm x 6mm), T3666-2
lead free, bulk
36 Thin QFN-EP*
MAX9985ETX+T -40°C to +85°C (6mm x 6mm), T3666-2
lead free, T/R
*EP = Exposed paddle.
T = Tape-and-reel package.
+Denotes lead-free and RoHS compliant.
________________________________________________________________ Maxim Integrated Products 1
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 page  
www.DataSheet4U.com
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
Typical Operating Characteristics
(Using the Typical Application Circuit, VCC = 5.0V, PLO = 0dBm, PRF = -5dBm, fRF > fLO, fIF = 100MHz, TC = +25°C, unless other-
wise noted.)
CONVERSION GAIN vs. RF FREQUENCY
8
TC = -30°C
CONVERSION GAIN vs. RF FREQUENCY
8
CONVERSION GAIN vs. RF FREQUENCY
8
777
6
5 TC = +85°C TC = +25°C
4
700
800 900
RF FREQUENCY (MHz)
1000
INPUT IP3 vs. RF FREQUENCY
30
TC = +85°C
29
28
27 TC = +25°C
26
TC = -30°C
25
24
700
800 900
RF FREQUENCY (MHz)
1000
NOISE FIGURE vs. RF FREQUENCY
14
13 TC = +85°C
12
11
10
9
TC = +25°C
8 TC = -30°C
7
700
800 900
RF FREQUENCY (MHz)
1000
6
PLO = -3dBm, 0dBm, +3dBm
5
4
700
800 900
RF FREQUENCY (MHz)
1000
INPUT IP3 vs. RF FREQUENCY
30
29
28
27
PLO = -3dBm, 0dBm, +3dBm
26
25
24
700
800 900
RF FREQUENCY (MHz)
1000
NOISE FIGURE vs. RF FREQUENCY
14
13
12
11
10
9 PLO = -3dBm, 0dBm, +3dBm
8
7
700 800 900 1000
RF FREQUENCY (MHz)
6
VCC = 4.75V, 5.0V, 5.25V
5
4
700
800 900
RF FREQUENCY (MHz)
1000
INPUT IP3 vs. RF FREQUENCY
30
VCC = 4.75V
29
VCC = 5.0V
28
VCC = 5.25V
27
26
25
24
700
800 900
RF FREQUENCY (MHz)
1000
NOISE FIGURE vs. RF FREQUENCY
14
13
12 VCC = 5.25V
11
10
9
VCC = 5.0V
VCC = 4.75V
8
7
700
800 900
RF FREQUENCY (MHz)
1000
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
Pin Description
PIN
1
2
3, 5, 7, 12,
20, 22, 24,
25, 26, 34
4, 6, 10, 16,
21, 30, 36
8
9
11
13, 14
15
17
18, 28
19
23
27
29
31
32, 33
35
—
NAME
RFMAIN
TAPMAIN
FUNCTION
Main Channel RF input. Internally matched to 50Ω. Requires an input DC-blocking capacitor.
Main Channel Balun Center Tap. Bypass to GND with capacitors close to the pin.
GND
Ground
VCC
TAPDIV
RFDIV
IFDBIAS
Power Supply. Connect bypass capacitors as close to the pin as possible (see the Typical
Application Circuit).
Diversity Channel Balun Center Tap. Bypass to GND with capacitors close to the pin.
Diversity Channel RF Input. Internally matched to 50Ω. Requires an input DC-blocking capacitor.
IF Diversity Amplifier Bias Control. Connect a 1.07kΩ resistor from this pin to ground to set the bias
current for the diversity IF amplifier (see the Typical Operating Characteristics for typical performance
versus resistor value).
IFD+, IFD-
LEXTD
Diversity Mixer Differential IF Output. Connect pullup inductors from each of these pins to VCC (see
the Typical Application Circuit).
Connect a 30nH inductor from this pin to ground to increase the RF-to-IF and LO-to-IF isolation.
Connect this pin to ground if isolations can be degraded (see the Typical Operating Characteristics
for typical degradation).
LODBIAS
N.C.
LO1
LOSEL
LO2
LOMBIAS
LO Diversity Amplifier Bias Control. Connect a 1.1kΩ resistor from this pin to ground to set the bias
current for the diversity LO amplifier (see the Typical Operating Characteristics for typical
performance versus resistor value).
No Connection. Not internally connected.
Local Oscillator 1 Input. This input is internally matched to 50Ω. Requires an input DC-blocking capacitor.
Local Oscillator Select. Set this pin to high to select LO1. Set low to select LO2.
Local Oscillator 2 Input. This input is internally matched to 50Ω. Requires an input DC-blocking capacitor.
LO Main Amplifier Bias Control. Connect a 1.1kΩ resistor from this pin to ground to set the bias
current for the main LO amplifier (see the Typical Operating Characteristics for typical performance
versus resistor value).
LEXTM
Connect a 30nH inductor from this pin to ground to increase the RF-IF and LO-IF isolation. Connect
this pin to ground if isolations can be degraded (see the Typical Operating Characteristics for typical
degradation).
IFM-, IFM+
IFMBIAS
EP
Main Mixer Differential IF Output. Connect pullup inductors from each of these pins to VCC (see the
Typical Application Circuit).
IF Main Amplifier Bias Control. Connect a 1.07kΩ resistor from this pin to ground to set the bias current for
the main IF amplifier (see the Typical Operating Characteristics for typical performance vs. resistor value).
Exposed Paddle. Solder the exposed paddle to the ground plane using multiple vias. This paddle
affects RF performance and provides heat dissipation.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX9985.PDF ] | |
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