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19-2486; Rev 0; 7/02
+14dBm to +20dBm LO Buffers
with ±1dB Variation
General Description
The MAX9989 and MAX9990 LO buffers provide the high
output (+14dBm to +20dBm) necessary to drive the LO
inputs of high-linearity passive mixers, while offering 40dB
reverse isolation to prevent LO pulling. The MAX9989 is
internally matched for the cellular/GSM bands, and the
MAX9990 is matched for the DCS/PCS/UMTS bands.
The Typical Application Circuit provides a nominal
+17dBm output power with ±1dB variation over supply,
temperature, and input power. With two optional resis-
tors, the output power can be precision set from
+14dBm to +20dBm. The devices offer more than 35dB
main driver output to PLL amp output isolation. Each
device is offered in a 5mm ? 5mm 20-pin thin QFN
package with exposed paddle.
Applications
Cellular/GSM/DCS/PCS/UMTS Base Station
Features
o ±1dB Output Power Variation
o +14dBm to +20dBm Adjustable Output Power
o 40dB Reverse Isolation
o Better Than 35dB Main Driver Output to PLL Amp
Output Isolation
o Low Output Noise: -170dBc/Hz at +17dBm
o 110mA Supply Current at +17dBm
o ESD Protection
o Isolated PLL Output (+3dBm)
Ordering Information
Tx/Rx LO Drives
Coherent Receivers
PART
TEMP
RANGE
PIN-
PACKAGE
FREQUENCY
RANGE (MHz)
MAX9989 ETP -40 ° C to +85 ° C
ISM Wireless LAN
Wireless Local Loop
Local Multipoint Distribution Service
Point-to-Point Systems
20 Thin
700 to 1100
QFN-EP*
MAX9990 ETP -40 ° C to +85 ° C 20 QFN-EP* 1500 to 2200
* EP = Exposed paddle.
Typical Application Circuit/Pin Configuration appears at end of data sheet.
Typical Operating Circuit and Block Diagram
PLL BUFFER
TO PLL
PRESCALER
OUTPLL
(+3dBm)
MAX9989
MAX9990
RF INPUT
IN
(+7dBm)
INPUT AMP
OUTPUT AMP
OUTLO
(+17dBm)
IF OUTPUT
RF LO
BIAS
BIASIN
BIASOUT
BIAS
CONTROL
NETWORK
________________________________________________________________ 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.
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