View MAX9988EGP_1274343.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-2416; Rev 0; 4/02
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation
General Description
The MAX9987 and MAX9988 LO buffers/splitters each integrate a passive two-way power splitter with highisolation input and output buffer amplifiers. These buffers are designed to 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 MAX9987 is internally matched for the cellular/GSM bands, and the MAX9988 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 resistors, the output power can be precision set from +14dBm to +20dBm. The devices offer more than 30dB output-to-output port isolation, and are offered in 5mm 5mm 20-pin QFN packages with exposed paddle. o 1dB Output Power Variation o +14dBm to +20dBm Adjustable Output Power o Two-Way Power Splitting o 40dB Reverse Isolation o More than 30dB Output-to-Output Isolation o Low Output Noise: -170dBc/Hz at +17dBm o 160mA Supply Current at +17dBm o ESD Protection o Isolated PLL Output (+3dBm)
Features
MAX9987/MAX9988
Applications
Cellular/GSM/DCS/PCS/UMTS Base Station Tx/Rx LO Drive Base Station Main and Diversity Channels Coherent Receivers ISM Wireless LAN Wireless Local Loop Local Multipoint Distribution Service Point-to-Point Systems
*EP = Exposed paddle
MAX9987EGP MAX9988EGP PART
Ordering Information
TEMP RANGE -40C to 85C -40C to 85C PINPACKAGE 20 QFN-EP* 20 QFN-EP* FREQUENCY RANGE 700MHz to 1100MHz 1500MHz to 2200MHz
Typical Operating Circuit and Block Diagram
PLL BUFFER TO PLL PRESCALER OUTPLL (+3dBm) OUTPUT AMP (1) OUT1 (+17dBm) RF INPUT (1)
MAX9987 MAX9988
IF OUTPUT (1)
IN (+7dBm) RF LO
INPUT AMP PASSIVE TWO-WAY POWER SPLITTER BIAS OUTPUT AMP (2) BIASIN BIASOUT OUT2 (+17dBm)
RF INPUT (2)
IF OUTPUT (2)
BIAS CONTROL NETWORK
________________________________________________________________ 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.
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation MAX9987/MAX9988
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2, VCC3, VCCREF to GND.................................................-0.3V to +6.0V IN to GND ...................................................-0.3V to (VCC + 0.3V) OUT1, OUT2, OUTPLL to GND ......................................-0.3V to (VCC + 0.3V) REF to GND ......................................................Source/Sink 5mA INBIAS, OUTBIAS, to GND..................................-0.3V to +0.75V PLLBIAS ......................................................................Sink 25mA RF Input Power ...............................................................+20dBm Continuous Power Dissipation (TA = +70C) 5mm 5mm 20-Pin QFN (derate 20mW/C above +70C).............................................................1600mW JA ....................................................................................50C/W Junction Temperature ......................................................+150C Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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--MAX9987
(Typical Application Circuit, VCC = 4.75V to 5.25V, input and outputs terminated in 50, TA = -40C to +85C. Typical specifications are for VCC = 5.0V and TA = +25C.) (Note 1)
PARAMETER Supply Voltage SYMBOL VCC Low power setting (see Table 1 for resistor values) Supply Current ICC Nominal power setting (R1, R2, R4, and R5 not installed) High power setting (see Table 1 for resistor values) 139 CONDITIONS MIN 4.75 TYP 5.00 110 155 221 171 mA MAX 5.25 UNITS V
DC ELECTRICAL CHARACTERISTICS--MAX9988
(Typical Application Circuit, VCC = 4.75V to 5.25V, input and outputs terminated in 50, TA = -40C to +85C. Typical specifications are for VCC = 5.0V and TA = +25C.) (Note 1)
PARAMETER Supply Voltage SYMBOL VCC Low power setting (see Table 1 for resistor values) Supply Current ICC Nominal power setting (R1, R2, R4, and R5 not installed) High power setting (see Table 1 for resistor values) 150 CONDITIONS MIN 4.75 TYP 5.00 120 162 229 175 mA MAX 5.25 UNITS V
2
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation
AC ELECTRICAL CHARACTERISTICS--MAX9987
(Typical Application Circuit, VCC = 4.75V to 5.25V, 50 environment, +4dBm < PIN < +10dBm, 700MHz < fIN < 1100MHz, TA = -40C to +85C, unless otherwise noted. Typical specifications are for VCC = 5.0V, PIN = +7dBm, fIN = 900MHz, and TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Operating Frequency SYMBOL f CONDITIONS Low power setting, PIN = +4dBm (see Table 1 for resistor values) Nominal power setting, +4dBm < PIN < +10dBm, 4.75V < VCC < 5.25V, -40C < TA < +85C (R1, R2, R4, and R5 not installed) High power setting, PIN = +10dBm (see Table 1 for resistor values) Output Power (PLL Driver) Input VSWR Output VSWR Output-Noise Power Density OUT1 to OUT2 Isolation OUT2 to OUT1 Isolation OUT1 to RFIN Isolation OUT2 to RFIN Isolation POUTPLL VSWRIN VSWROUT PNOISE S23 S32 S12 S13 VCC = 5.0V, 100MHz offset (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) MIN 700 TYP MAX 1100 UNITS MHz
MAX9987/MAX9988
14.3
Output Power (Main Drivers)
POUTLO
17.3 0.8
dBm
19.7 3.7 1.2:1 1.7:1 -152 45 39 48 50 dBm/Hz dB dB dB dB dBm
_______________________________________________________________________________________
3
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation MAX9987/MAX9988
AC ELECTRICAL CHARACTERISTICS--MAX9988
(Typical Application Circuit, VCC = 4.75V to 5.25V, 50 environment, +6dBm < PIN < +12dBm, 1500MHz < fIN < 2200MHz, and TA = -40C to +85C, unless otherwise noted. Typical specifications are for VCC = 5.0V, PIN = +9dBm, fIN = 1800MHz, and TA = +25C unless otherwise noted.) (Note 1)
PARAMETER Operating Frequency SYMBOL f Low power setting, PIN = +6dBm (see Table 1 for resistor values) Output Power (Main Drivers) Nominal power setting, +6dBm < PIN < +12dBm, 4.75V < VCC < 5.25V, -40C < TA < +85C (R1, R2, R4, and R5 not installed) High power setting, PIN = +12dBm (see Table 1 for resistor values) Output Power (PLL Driver) Input VSWR Output VSWR Output-Noise Power Density OUT1 to OUT2 Isolation OUT2 to OUT1 Isolation OUT1 to RFIN Isolation OUT2 to RFIN Isolation POUTPLL VSWRIN VSWROUT PNOISE S23 S32 S12 S13 VCC = 5.0V, 100MHz offset VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) VCC = 5.0V, nominal power setting (R1, R2, R4, and R5 not installed) CONDITIONS MIN 1500 14.2 TYP MAX 2200 UNITS MHz
POUTLO
17.3 0.8
dBm
19.5 3.6 1.5:1 1.4:1 -152 33 44 49 47 dBm/Hz dB dB dB dB dBm
Note 1: Devices are 100% DC screened and AC production tested for functionality. Data sheet typical specifications are derived from the average of 30 units from a typical lot, and are tested under the conditions specified for the typical specifications.
4
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation
Typical Operating Characteristics
(VCC = 5.0V, nominal bias, fIN = 900MHz, PIN = +7dBm, TA = +25C, unless otherwise noted.) (Shaded regions are outside the guaranteed operating range, and are provided for reference only.)
MAX9987/MAX9988
MAX9987
SUPPLY CURRENT vs. OUTPUT POWER OUTMAIN
MAX9987 toc01
OUTPUT POWER vs. INPUT POWER OUT1
20 19 18 OUTPUT POWER (dBm) 17 16 15 14 13 12 11 10 TA = +85C TA = +25C TA = -40C OUTPUT POWER (dBm)
MAX9987 toc02
OUTPUT POWER vs. INPUT POWER OUT2
20 19 18 17 16 15 14 13 12 11 10 TA = +85C TA = +25C TA = -40C
MAX9987 toc03
180 175 SUPPLY CURRENT (mA) 170 165 160 155 TA = -40C 150 145 140 -15 -10 -5 0 5 10 15 TA = +25C AND +85C
20
OUTPUT POWER (dBm)
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 INPUT POWER (dBm)
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 INPUT POWER (dBm)
OUTPUT POWER vs. INPUT POWER, OUTPLL
MAX9987 toc04
OUTPUT POWER vs. FREQUENCY, OUT1
MAX9987 toc05
OUTPUT POWER vs. FREQUENCY, OUT2
MAX9987 toc06
5 4 3 OUTPUT POWER (dBm) 2 1 0 -1 -2 -3 -4 -5 -6 -4 -2 0 2 4 6 8 TA = +85C TA = +25C TA = -40C
20 19 OUTPUT POWER (dBm) TA = +25C 18 17 16 15 14 TA = +85C
20 19 OUTPUT POWER (dBm) 18 17 TA = +85C 16 15 14
TA = -40C
TA = +25C
TA = -40C
10
500
600
700
800
900 1000 1100 1200
500
600
700
800
900 1000 1100 1200
INPUT POWER (dBm)
OPERATING FREQUENCY (MHz)
OPERATING FREQUENCY (MHz)
OUTPUT POWER vs. FREQUENCY, PLL
MAX9987 toc07
OUTPUT POWER AND SUPPLY CURRENT vs. TEMPERATURE
18.0 17.8 17.6 OUTPUT POWER (dBm) 17.4 17.2 17.0 16.8 16.6 16.4 16.2 POUT ICC
MAX9987 toc08
OUTPUT POWER vs. SUPPLY VOLTAGE
162.0 OUT1, OUT2 OUTPUT POWER (dBm) 161.8 SUPPLY CURRENT (mA) 161.6 161.4 161.2 161.0 160.8 160.6 160.4 160.2 160.0 18.0 17.5 17.0 16.5 16.0 15.5 15.0 14.5 14.0 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 SUPPLY VOLTAGE (V) OUTPLL OUT2 OUT1
MAX9987 toc09
6 5 OUTPUT POWER (dBm) 4 3 2 1 0 500 600 700 800 TA = -40C TA = +25C T = +85C A
6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 PLL OUTPUT POWER (dBm)
900 1000 1100 1200
16.0 -40 -20 0 20 40 60 80 AMBIENT TEMPERATURE (C)
OPERATING FREQUENCY (MHz)
_______________________________________________________________________________________
5
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation MAX9987/MAX9988
Typical Operating Characteristics (continued)
(VCC = 5.0V, nominal bias, fIN = 900MHz, PIN = +7dBm, TA = +25C, unless otherwise noted.) (Shaded regions are outside the guaranteed operating range, and are provided for reference only.)
MAX9987
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9987 toc10
SMALL-SIGNAL GAIN vs. FREQUENCY
VCC = 5.0V TA = +25C PIN = -15dBm NOMINAL BIAS
MAX9987 toc11
INPUT RETURN LOSS vs. FREQUENCY
-5 -10 RETURN LOSS (dB) -15 -20 -25 -30 VCC = 5.0V TA = +25C PIN = +7dBm
MAX9987 toc12
170 165 SUPPLY CURRENT (mA) 160 PLL BIASED 155 150 145 140 PLL NOT BIASED
19 18 17 GAIN (dB) 16 15 14 13
0
OUT2
OUT1
-35 -40 0.5 0.6 0.7 0.8 0.9 1.0 1.1 0.5 0.6 0.7 0.8 0.9 1.0 1.1 FREQUENCY (GHz) FREQUENCY (GHz)
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 SUPPLY VOLTAGE (V)
OUTPUT RETURN LOSS vs. FREQUENCY
MAX9987 toc13
IN ISOLATION vs. FREQUENCY
-25 -30 ISOLATION (dB) -35 -40 -45 -50 -55 -60 -65 -70 OUT1 TO IN OUT2 TO IN PLL TO IN VCC = 5.0V TA = +25C PIN = +7dBm
MAX9987 toc14
OUT1 AND OUT2 ISOLATION vs. FREQUENCY
-25 -30 ISOLATION (dB) -35 -40 -45 -50 -55 -60 -65 -70 OUT2 TO OUT1 OUT1 TO OUT2 VCC = 5.0V TA = +25C PIN = +7dBm
MAX9987 toc15
0 -2 -4 RETURN LOSS (dB) -6 -8 -10 -12 -14 -16 -18 -20 0.5 0.6 0.7 0.8 0.9 1.0 PLL OUT2 VCC = 5.0V TA = +25C PIN = +7dBm OUT1
-20
-20
1.1
0.5
0.6
0.7
0.8
0.9
1.0
1.1
0.5
0.6
0.7
0.8
0.9
1.0
1.1
FREQUENCY (GHz)
FREQUENCY (GHz)
FREQUENCY (GHz)
PLL ISOLATION vs. FREQUENCY
MAX9987 toc16
OUTPUT NOISE POWER vs. INPUT POWER
100MHz OFFSET NOISE POWER (dBm/Hz) -145
MAX9987 toc17
-20 -25 -30 ISOLATION (dB) -35 -40 -45 -50 -55 -60 -65 -70 0.5 0.6 0.7 0.8 0.9 1.0 OUT1 TO PLL OUT2 TO PLL PLL TO OUT_ VCC = 5.0V TA = +25C PIN = +7dBm
-140
-150
-155
-160 1.1 4 5 6 7 8 9 10 FREQUENCY (GHz) INPUT POWER (dBm)
6
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation
Typical Operating Characteristics (continued)
(VCC = 5.0V, nominal bias, fIN = 1800MHz, PIN = +7dBm, TA = +25C, unless otherwise noted.) (Shaded regions are outside the guaranteed operating range, and are provided for reference only.)
MAX9987/MAX9988
MAX9988
SUPPLY CURRENT vs. OUTPUT POWER
MAX9988 toc01
OUTPUT POWER vs. INPUT POWER, OUT1
MAX9988 toc02
OUTPUT POWER vs. INPUT POWER, OUT2
19 18 OUTPUT POWER (dBm) 17 16 15 14 13 12 11 TA = +85C TA = -40C TA = +25C
MAX9988 toc03
180 175 SUPPLY CURRENT (mA) 170 165 160 TA = +25C 155 150 145 140 -15 -10 -5 0 5 10 15 TA = -40C TA = +85C
20 19 18 OUTPUT POWER (dBm) 17 16 15 14 13 12 11 10 TA = +85C TA = +25C TA = -40C
20
20
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 INPUT POWER (dBm)
10 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 INPUT POWER (dBm)
OUTPUT POWER (dBm)
OUTPUT POWER vs. INPUT POWER, OUTPLL
MAX9988 toc04
OUTPUT POWER vs. FREQUENCY, OUT1
MAX9988 toc05
OUTPUT POWER vs. FREQUENCY, OUT2
19 18 OUTPUT POWER (dBm) 17 16 15 14 13 12 11 10 TA = +25C TA = +85C TA = -40C
MAX9988 toc06
MAX9988 toc09
5 4 3 OUTPUT POWER (dBm) 2 1 0 -1 -2 -3 -4 -5 -6 -4 -2 0 2 4 6 8 TA = -40C TA = +25C AND +85C
20 19 18 OUTPUT POWER (dBm) 17 16 15 14 13 12 11 10 TA = +25C TA = -40C
20
TA = +85C
10
1500 1600 1700 1800 1900 2000 2100 2200 OPERATING FREQUENCY (MHz)
1500 1600 1700 1800 1900 2000 2100 2200 OPERATING FREQUENCY (MHz)
INPUT POWER (dBm)
OUTPUT POWER vs. FREQUENCY, OUTPLL
MAX9988 toc07
OUTPUT POWER AND SUPPLY CURRENT vs. TEMPERATURE
18.0 17.8 17.6 17.4 17.2 17.0 16.8 16.6 16.4 16.2 16.0 15.8 15.6 15.4 15.2 15.0 -40 -20 0
MAX9988 toc08
OUTPUT POWER vs. SUPPLY VOLTAGE
190 188 186 184 182 180 178 176 174 172 170 168 166 164 162 160 18.0 OUT1, OUT2 OUTPUT POWER (dBm) 17.5 17.0 16.5 16.0 15.5 15.0 14.5 14.0 OUTPLL 3.5 3.0 2.5 2.0 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 SUPPLY VOLTAGE (V) OUT2 OUT1 6.0 5.5 5.0 4.5 4.0 PLL OUTPUT POWER (dBm)
6 5 OUTPUT POWER (dBm) 4 3 TA = -40C 2 1 0 TA = +85C TA = +25C
OUTPUT POWER (dBm)
POUT
ICC
1500 1600 1700 1800 1900 2000 2100 2200 OPERATING FREQUENCY (MHz)
20
40
60
80
AMBIENT TEMPERATURE (C)
_______________________________________________________________________________________
SUPPLY CURRENT (mA)
7
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation MAX9987/MAX9988
Typical Operating Characteristics (continued)
(VCC = 5.0V, nominal bias, fIN = 1800MHz, PIN = +7dBm, TA = +25C, unless otherwise noted.) (Shaded regions are outside the guaranteed operating range, and are provided for reference only.)
MAX9988
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9988 toc10
SMALL-SIGNAL GAIN vs. FREQUENCY
17 16 OUT2 VCC = 5.0V TA = +25C PIN = -15dBm NORMAL BIAS
MAX9988 toc11
INPUT RETURN LOSS vs. FREQUENCY
VCC = 5.0V TA = +25C PIN = +7dBm
MAX09988 toc12
180 175 SUPPLY CURRENT (mA) 170 PLL BIASED 165 160 155 150 PLL NOT BIASED
18
-6 -8 RETURN LOSS (dB) -10 -12 -14 -16
GAIN (dB)
15 14 13 12 11 10 OUT1
-18 -20 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 FREQUENCY (GHz) FREQUENCY (GHz)
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 SUPPLY VOLTAGE (V)
OUTPUT RETURN LOSS vs. FREQUENCY
MAX9988 toc13
OUT TO IN ISOLATION vs. FREQUENCY
MAX9988 toc14
OUT TO OUT ISOLATION vs. FREQUENCY
-20 -25 ISOLATION (dB) -30 -35 -40 -45 -50 -55 OUT2 TO OUT1 OUT1 TO OUT2 VCC = 5.0V TA = +25C PIN = +7dBm
MAX9988 toc15
0 -5 -10 RETURN LOSS (dB) -15 -20 -25 -30 -35 -40 1.5 1.6 1.7 1.8 1.9 2.0 2.1 OUT1 OUTPLL VCC = 5.0V TA = +25C PIN = +7dBm OUT2
-15 -20 -25 ISOLATION (dB) -30 -35 -40 -45 -50 -55 -60 -65 OUT1 TO IN 1.5 1.6 1.7 1.8 1.9 2.0 2.1 OUT2 TO IN PLL TO IN VCC = 5.0V TA = +25C PIN = +7dBm
-15
-60 -65 2.2 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2
2.2
FREQUENCY (GHz)
FREQUENCY (GHz)
FREQUENCY (GHz)
PLL ISOLATION vs. FREQUENCY
MAX9988 toc16
OUTPUT NOISE vs. INPUT POWER
100MHz OFFSET
MAX9988 toc17
0 -5 -10 ISOLATION (dB) -15 -20 -25 -30 -35 -40 -45 -50 1.5 1.6 1.7 1.8 1.9 2.0 2.1 OUT1 TO PLL OUT2 TO PLL PLL TO OUT_ VCC = 5.0V TA = +25C PIN = +7dBm
-140
OUTPUT NOISE (dBm/Hz) 2.2
-145
-150
-155
-160 4 5 6 7 8 9 10 FREQUENCY (GHz) INPUT POWER (dBm)
8
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation
Pin Description
PIN 1, 4, 8, 9, 13, 17, 18, EP 2 3 5 NAME GND IN VCCREF REF Ground Input. Internally matched 50 RF input. AC couple to this pin. Supply. Supply connection for on-chip voltage and current references. See Applications Information for information on decoupling. Voltage Reference Output. Output for on-chip 1.5V bandgap voltage reference. See Applications Information section for information on decoupling. Bias Connection for Input Buffer. Set compressed power point for input amplifier with a resistor to REF or GND. For +17dBm output power, no external biasing resistors are required. See Applications Information section for information. Bias Connection for Output Amplifiers. Set compressed power point for OUT1 and OUT2 with a resistor to REF or ground. For +17dBm output power, no external biasing resistors are required. See Applications Information section for information. Output 2. Internally matched 50 RF output. AC couple to this pin. Supply. Supply connection for OUT2. Supply. Supply connection for OUT1. Output 1. Internally matched 50 RF output. AC couple to this pin. Supply. Supply connection for input amplifier. Output PLL. Output for driving optional external PLL. FUNCTION
MAX9987/MAX9988
6
BIASIN
7 10 11, 12 14, 15 16 19 20
BIASOUT OUT2 VCC3 VCC2 OUT1 VCC1 OUTPLL
Detailed Description
The MAX9987/MAX9988 LO amplifiers/splitters each consist of a single input amplifier, a two-way passive power splitter, two separate output amplifiers, as well as a third buffer amplifier to drive the LO's PLL. The bias currents for the amplifiers are adjustable through off-chip resistors. This allows the output level to be precision set anywhere from +14dBm to +20dBm. The PLL output is preset to +3dBm (about 900mVP-P into 50). Power levels are typically 1dB over the full supply, input power, frequency, and temperature range. Precision power control is achieved by internal control circuitry. Maintaining tight power control keeps the system engineer from over specifying the LO drive in order to guarantee a linearity specification in the base-station mixer. More than 40dB isolation between the LO outputs and the input prevents VCO pulling, and the 30dB outputto-output isolation reduces branch-to-branch coupling. The MAX9987 is specified from 700MHz to 1100MHz, and the MAX9988 is specified from 1500MHz to 2200MHz. Both are offered in compact 5mm 5mm 20pin QFN packages with exposed paddle.
Input Amplifier
A single low-noise input amplifier before the passive splitter provides gain and isolation. The compressed output power for this stage is controlled by the bias setting resistors R1 or R4 (see Typical Application Circuit). These resistors are not required for the nominal +17dBm output; see Table 1 for bias resistor values to obtain +14dBm to +20dBm output power. The input is internally matched to 50, and typical VSWR is no more than 2:1 over all operating conditions. Since the input is internally biased, provide a DC block at the input pin.
PLL Amplifier and Output
A small amount of power is tapped off from the input amplifier's output, and fed to a high-isolation buffer to drive the PLL output at +3dBm. If the PLL output is not required, it can be disabled by removing R3; disabling the PLL output saves 12mA supply current.
Passive Two-Way Splitter
The input amplifier drives an integrated power splitter. All impedance matching between stages is on-chip, so no external tuning components are required.
_______________________________________________________________________________________
9
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation MAX9987/MAX9988
Table 1. External Resistor Values for +14dBm to +20dBm Output Power
NOMINAL OUTPUT POWER (dBm) +20 +19 +18 +17 +16 +15 +14 R1 () 1.35k 2.2k 5.0k Open Open Open Open R2 () 2.0k 3.0k 6.0k Open Open Open Open R4 () Open Open Open Open 1.8k 0.9k 0.6k R5 () Open Open Open Open 3.0k 1.1k 0.6k MAX9987 INPUT DRIVE (dBm) 10 3 9 3 8 3 7 3 6 3 5 3 4 3 MAX9988 INPUT DRIVE (dBm) 12 3 11 3 10 3 9 3 8 3 7 3 6 3
Table 2. Component Values for Typical Application Circuit
COMPONENT VALUE DESIGNATION C1, C3, C6 C2, C4, C5, C7, C8, C9, C12, C13, C14 C10, C11 R1, R2, R4, R5 R3 MAX9987 (LOWBAND) 100pF 47pF 5pF See Table 1. 100 MAX9988 (HIGHBAND) 100nF 22pF 10pF See Table 1. 100
Applications Information
Input and Output Matching
All input and output matching is accomplished on-chip; no external matching circuitry is required. Use a DC block of about 47pF (lowband) or 22pF (highband) at the input and the outputs. Because these parts are internally broadband matched, adjusting external component values can optimize performance for a particular band.
Input Drive Level
In the case of the MAX9987, the typical required input drive level is +7dBm for +17dBm output, or +10dBm for +20dBm output. The MAX9988 uses slightly higher input levels (see Table 1). The typical VCO cannot provide sufficient drive by itself; the typical application follows the VCO with attenuation (about +3dB), and then with a low-noise gain block. This allows the VCO to drive the MAX9987/MAX9988 input at the required level without being load-pulled.
Driver Amplifiers and Outputs
Each of the output amplifiers are similar to the input amplifier, except they are biased higher to provide more output power. For example, with an input power of +10dBm, the MAX9987 can deliver +20dBm at both outputs. The bias is adjustable; see Table 1 for details. Both RF outputs are internally matched to 50, with a typical VSWR limit of 2:1. Provide DC blocking capacitors at the outputs.
Output Drive Level
The output drive of the MAX9987/MAX9988 is nominally +17dBm 1dB. This is the typical application, with no external bias-setting resistors at INBIAS and OUTBIAS. Output power can be set from +14dBm to +20dBm by using the bias-setting resistor values listed in Table 1.
Chip Information
TRANSISTOR COUNT: 89 PROCESS: BiCMOS
10
______________________________________________________________________________________
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation
Typical Application Circuit/Pin Configuration
5.0V 5.0V
MAX9987/MAX9988
C1
C2
C3 R3 100
C4
MAX9987 MAX9988
C13
TO OUTPUT 1
OUTPLL
VCC1
GND
OUT TO PLL (+3dBm)
C14
GND
OUT1
20 GND
19
18
17
16 VCC2 C11 C12
5.0V
1
15
INPUT FROM LO C5 5.0V C6 C7
IN VCCREF
2
14
VCC2 GND
3
13
GND
4 BIAS 5
12
VCC3
5.0V
REF
11
VCC3 C10 C9
6
7
8
9
10
GND
GND
BIASIN
BIASOUT
OUT2
R4*
R5* C8
TO OUTPUT 2
R1*
R2*
* FOR THESE VALUES, SEE TABLE 1. FOR CAPACITOR VALUES, SEE TABLE 2.
______________________________________________________________________________________
11
+14dBm to +20dBm LO Buffers/Splitters with 1dB Variation MAX9987/MAX9988
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.)
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 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX9988EGP

	To Download MAX9988EGP Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .