19-2486; Rev 0; 7/02
+14dBm to +20dBm LO Buffers
with ±1dB Variation
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 resistors, 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.
Features
♦ ±1dB Output Power Variation
♦ +14dBm to +20dBm Adjustable Output Power
♦ 40dB Reverse Isolation
♦ Better Than 35dB Main Driver Output to PLL Amp
Output Isolation
♦ Low Output Noise: -170dBc/Hz at +17dBm
♦ 110mA Supply Current at +17dBm
♦ ESD Protection
♦ Isolated PLL Output (+3dBm)
Applications
Ordering Information
Cellular/GSM/DCS/PCS/UMTS Base Station
Tx/Rx LO Drives
PART
Coherent Receivers
ISM Wireless LAN
TEMP
RANGE
MAX9989ETP -40°C to +85°C
Wireless Local Loop
PINPACKAGE
20 Thin
QFN-EP*
FREQUENCY
RANGE (MHz)
700 to 1100
MAX9990ETP -40°C to +85°C 20 QFN-EP* 1500 to 2200
Local Multipoint Distribution Service
*EP = Exposed paddle.
Point-to-Point Systems
Typical Application Circuit/Pin Configuration appears at end of data sheet.
Typical Operating Circuit and Block Diagram
PLL BUFFER
TO PLL
PRESCALER
MAX9989
MAX9990
OUTPLL
(+3dBm)
OUTPUT AMP
IN
(+7dBm)
INPUT AMP
RF INPUT
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.
1
MAX9989/MAX9990
General Description
MAX9989/MAX9990
+14dBm to +20dBm LO Buffers
with ±1dB Variation
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2, VCC3, VCCREF to GND .................-0.3V to +6.0V
IN to GND ...................................................-0.3V to (VCC + 0.3V)
OUTLO, 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 = +70°C)
20-Pin Thin QFN (derate 21mW/°C above +70°C) ....1667mW
θJA .................................................................................+48°C/W
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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—MAX9989
(Typical Application Circuit, VCC = 4.75V to 5.25V, input and outputs terminated in 50Ω, TA = -40°C to +85°C. Typical specifications
are for VCC = 5.0V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
VCC
MIN
TYP
MAX
UNITS
4.75
5.00
5.25
V
116
mA
Low power setting
(see Table 1 for resistor values)
Supply Current
ICC
Nominal power setting
(R2–R5 not installed) (Note 2)
77
94
High power setting
(see Table 1 for resistor values)
105
146
DC ELECTRICAL CHARACTERISTICS—MAX9990
(Typical Application Circuit, VCC = 4.75V to 5.25V, input and outputs terminated in 50Ω, TA = -40°C to +85°C. Typical specifications
are for VCC = 5.0V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
CONDITIONS
VCC
MIN
TYP
MAX
UNITS
4.75
5.00
5.25
V
122
mA
Low power setting
(see Table 1 for resistor values)
Supply Current
ICC
Nominal power setting
(R2–R5 not installed) (Note 2)
High power setting
(see Table 1 for resistor values)
2
87
98
111
154
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers
with ±1dB Variation
(Typical Application Circuit, VCC = 4.75V to 5.25V, 50Ω environment, +4dBm < PIN < +10dBm, 700MHz < fIN < 1100MHz,
TA = -40°C to +85°C, unless otherwise noted. Typical specifications are for VCC = 5.0V, PIN = +7dBm, fIN = 900MHz, and
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Frequency
Output Power
SYMBOL
f
POUTLO
CONDITIONS
MIN
700
TYP
Low power setting, PIN = +4dBm
(see Table 1 for resistor values)
14.3
Nominal power setting,
+4dBm < PIN < +10dBm
4.75V < VCC < 5.25V
-40°C < TA < +85°C (R2–R5 not installed)
17.3
±0.8
High power setting, PIN = +10dBm
(see Table 1 for resistor values)
19.7
Output Power (PLL Driver)
POUTPLL
3.7
Input VSWR
VSWRIN
1.2:1
Output VSWR
VSWROUT
Output-Noise Power Density
OUTLO to RFIN Isolation
PNOISE
S12
MAX
1100
UNITS
MHz
dBm
dBm
1.7:1
VCC = 5.0V, ±100MHz offset
(R2–R5 not installed)
VCC = 5.0V, nominal power setting
(R2–R5 not installed)
-152
dBm/Hz
48
dB
AC ELECTRICAL CHARACTERISTICS—MAX9990
(Typical Application Circuit, VCC = 4.75V to 5.25V, 50Ω environment, +6dBm < PIN < +12dBm, 1500MHz < fIN < 2200MHz, and
TA = -40°C to +85°C, unless otherwise noted. Typical specifications are for VCC = 5.0V, PIN = +9dBm, fIN = 1800MHz, and
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Frequency
Output Power
SYMBOL
f
POUTLO
Output Power (PLL Driver)
Input VSWR
Output VSWR
Output-Noise Power Density
OUTLO to RFIN Isolation
CONDITIONS
MIN
TYP
1500
Low power setting, PIN = +6dBm
(see Table 1 for resistor values)
14.2
Nominal power setting,
+6dBm < PIN < +12dBm
4.75V < VCC < 5.25V
-40°C < TA < +85°C (R2–R5 not installed)
17.3
±0.8
High power setting, PIN = +12dBm
(see Table 1 for resistor values)
19.5
POUTPLL
3.6
VSWRIN
1.5:1
VSWROUT
1.4:1
PNOISE
S12
VCC = 5.0V, ±100MHz offset
VCC = 5.0V, nominal power setting
(R2–R5 not installed)
MAX
UNITS
2200
MHz
dBm
dBm
-152
dBm/Hz
49
dB
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.
Note 2: DC current limits at -40°C are guaranteed by design and characterization.
_______________________________________________________________________________________
3
MAX9989/MAX9990
AC ELECTRICAL CHARACTERISTICS—MAX9989
Typical Operating Characteristics
(VCC = 5.0V, nominal bias, fIN = 900MHz, PIN = +7dBm, TA = +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
MAX9989
18
OUTPUT POWER (dBm)
TA = +85°C
TA = +25°C
105
TA = -40°C
100
TA = +25°C
17
16
15
TA = +85°C
14
13
4
INPUT POWER (dBm)
-2
0
2
4
INPUT POWER (dBm)
MAX9989 toc05
MAX9989 toc04
7
6
TA = +25°C
OUTPUT POWER (dBm)
18
17
TA = +85°C
15
TA = +85°C
5
4
TA = -40°C
3
TA = +25°C
2
1
14
0
500
600
700
800
1000 1100 1200
900
500
OPERATING FREQUENCY (MHz)
MAX9989 toc06
111.5
17.5
17.6
111.0
110.5
ICC
17.2
110.0
17.0
109.5
16.8
109.0
16.6
108.5
16.4
108.0
16.2
16.0
-40
-20
0
20
40
60
AMBIENT TEMPERATURE (°C)
80
OUTLO OUTPUT POWER (dBm)
17.8
SUPPLY CURRENT (mA)
18.0
POUTLO
800
900
1000 1100 1200
OUTPUT POWER vs. SUPPLY VOLTAGE
112.0
17.4
700
OPERATING FREQUENCY (MHz)
OUTPUT POWER AND SUPPLY CURRENT
vs. TEMPERATURE
18.0
600
MAX9989 toc07
6.0
5.5
OUTLO
17.0
5.0
16.5
4.5
16.0
4.0
OUTPLL
15.5
3.5
15.0
3.0
107.5
14.5
2.5
107.0
14.0
2.0
4.5
4.7
4.9
5.1
5.3
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
OUTPLL OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
-4
-6
OUTPUT POWER vs. FREQUENCY
OUTPLL
20
OUTPUT POWER (dBm)
0
-4
OUTPUT POWER (dBm)
16
TA = +85°C
-1
-3
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
TA = -40°C
TA = +25°C
1
-2
10 11 12 13 14 15 16 17 18 19 20
19
2
11
10
TA = -40°C
3
12
OUTPUT POWER vs. FREQUENCY
OUTLO
4
5
OUTPUT POWER (dBm)
TA = -40°C
6
MAX9989 toc02
19
115
110
OUTPUT POWER vs. INPUT POWER
OUTPLL
20
MAX9989 toc01
120
OUTPUT POWER vs. INPUT POWER
OUTLO
MAX9989 toc03
SUPPLY CURRENT vs. OUTPUT POWER
OUTLO
SUPPLY CURRENT (mA)
MAX9989/MAX9990
+14dBm to +20dBm LO Buffers
with ±1dB Variation
6
8
10
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9989
-10
RETURN LOSS (dB)
GAIN (dB)
105
16
15
100
VCC = 5V
TA = +25°C
PIN = +7dBm
-5
17
PLL BIASED
MAX9989 toc10
VCC = 5V
TA = +25°C
PIN = -15dBm
NOMINAL BIAS
18
0
MAX9989 toc09
19
MAX9989 toc08
110
-15
-20
-25
-30
14
-35
-40
13
90
4.7
4.9
5.1
5.3
500
5.5
600
700
800
900
600
500
1000 1100 1200
700
4
8
OUTLO
12
-30
1000
1100
-35
-40
OUTPLL TO IN
-45
-50
14
-55
16
-60
18
VCC = 5V
TA = +25°C
PIN = +7dBm
-25
ISOLATION (dB)
6
10
-20
MAX9989 toc11
VCC = 5V
TA = +25°C
PIN = +7dBm
2
900
OUT-TO-IN ISOLATION vs. FREQUENCY
OUTPUT RETURN LOSS vs. FREQUENCY
0
800
FREQUENCY (MHz)
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
RETURN LOSS (dB)
OUTLO TO IN
-65
OUTPLL
-70
20
500
600
700
800
900
1000
500
1100
600
700
PLL ISOLATION vs. FREQUENCY
-30
-35
-40
-45
1000
1100
-140
±100MHz OFFSET
NOISE POWER (dBm/Hz)
VCC = 5V
TA = +25°C
PIN = +7dBm
OUTPLL TO
OUTLO
900
OUTPUT NOISE POWER vs. INPUT POWER
-20
-25
800
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX9989 toc13
4.5
MAX9989 toc12
PLL NOT BIASED
OUTLO TO OUTPLL
-50
-55
MAX9989 toc14
95
ISOLATION (dB)
SUPPLY CURRENT (mA)
115
INPUT RETURN LOSS vs. FREQUENCY
SMALL-SIGNAL GAIN vs. FREQUENCY
SUPPLY CURRENT vs. SUPPLY VOLTAGE
120
-145
-150
-155
-60
-65
-70
-160
500
600
700
800
900
FREQUENCY (MHz)
1000
1100
4
5
6
7
8
9
10
11
12
13
INPUT POWER (dBm)
_______________________________________________________________________________________
5
MAX9989/MAX9990
Typical Operating Characteristics (continued)
(VCC = 5.0V, nominal bias, fIN = 900MHz, PIN = +7dBm, TA = +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
Typical Operating Characteristics (continued)
(VCC = 5.0V, nominal bias, fIN = 1800MHz, PIN = +9dBm, TA = +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
MAX9990
18
OUTPUT POWER (dBm)
130
125
TA = +85°C
TA = +25°C
115
110
105
TA = -40°C
100
5
17
16
15
TA = +85°C
14
13
3
2
1
9
-2
11
-3
-4
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
OUTPUT POWER (dBm)
-2
TA = +25°C
TA = +85°C
5
OUTPUT POWER (dBm)
18
17
16
2
6
MAX9990 toc04
TA = -40°C
0
4
INPUT POWER (dBm)
OUTPUT POWER vs. FREQUENCY
OUTPLL
20
OUTPUT POWER (dBm)
-4
-6
INPUT POWER (dBm)
OUTPUT POWER vs. FREQUENCY
OUTLO
19
TA = +25°C
-1
12
10 11 12 13 14 15 16 17 18
TA = +85°C
0
10
8
TA = -40°C
4
TA = +25°C
TA = +85°C
15
14
13
12
MAX9990 toc05
120
6
OUTPUT POWER (dBm)
135
TA = -40°C
19
OUTPUT POWER vs. INPUT POWER
OUTPLL
MAX9990 toc02
20
MAX9990 toc01
140
OUTPUT POWER vs. INPUT POWER
OUTLO
MAX9990 toc03
SUPPLY CURRENT vs. OUTPUT POWER
OUTLO
SUPPLY CURRENT (mA)
TA = +25°C
4
TA = -40°C
3
2
1
11
10
0
1500 1600 1700 1800 1900 2000 2100 2200
1500 1600 1700 1800 1900 2000 2100 2200
OPERATING FREQUENCY (MHz)
OPERATING FREQUENCY (MHz)
OUTPUT POWER AND SUPPLY CURRENT
vs. TEMPERATURE
120
16.5
115
ICC
16.0
110
15.5
105
100
15.0
-40
-20
0
20
40
60
AMBIENT TEMPERATURE (°C)
6
80
6.0
5.5
OUTLO
17.0
5.0
16.5
4.5
16.0
4.0
OUTPLL
15.5
3.5
15.0
3.0
14.5
2.5
2.0
14.0
4.5
4.7
4.9
5.1
5.3
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
OUTPLL OUTPUT POWER (dBm)
17.0
MAX9990 toc07
17.5
125
POUTLO
SUPPLY CURRENT (mA)
17.5
OUTPUT POWER vs. SUPPLY VOLTAGE
18.0
130
OUTLO OUTPUT POWER (dBm)
MAX9990 toc06
18.0
OUTPUT POWER (dBm)
MAX9989/MAX9990
+14dBm to +20dBm LO Buffers
with ±1dB Variation
6
8
10
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9990
SMALL-SIGNAL GAIN vs. FREQUENCY
OUTLO
-40°C
16
110
+25°C
15
14
13
105
-18
-20
10
4.9
5.1
5.3
5.5
1500 1600 1700 1800 1900 2000 2100 2200
1500 1600 1700 1800 1900 2000 2100 2200
FREQUENCY (MHz)
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
OUT-TO-IN ISOLATION vs. FREQUENCY
OUTPUT RETURN LOSS vs. FREQUENCY
5
15
MAX9990 toc11
0
VCC = 5V
TA = +25°C
PIN = +9dBm
25
ISOLATION (dB)
10
15
OUTLO
20
25
OUTPLL
OUTPLL TO IN
30
35
40
45
50
30
OUTLO TO IN
55
35
60
65
40
1500 1600 1700 1800 1900 2000 2100 2200
1500 1600 1700 1800 1900 2000 2100 2200
FREQUENCY (MHz)
FREQUENCY (GHz)
PLL ISOLATION vs. FREQUENCY
OUTPUT NOISE POWER vs. INPUT POWER
PLL TO OUTLO
-30
-35
-40
OUTLO TO PLL
-50
VCC = 5V
TA = +25°C
PIN = +9dBm
-55
-60
±100MHz OFFSET
NOISE POWER (dBm/Hz)
-25
-45
-140
MAX9990 toc13
-15
-20
VCC = 5V
TA = +25°C
PIN = +9dBm
20
-65
MAX9990 toc14
4.7
RETURN LOSS (dB)
4.5
-14
+85°C
11
100
-12
-16
12
PLL NOT BIASED
-10
MAX9990 toc12
GAIN (dB)
PLL BIASED
VCC = 5V
TA = +25°C
PIN = +9dBm
-8
RETURN LOSS (dB)
VCC = 5V
PIN = -15dBm
NOMINAL BIAS
17
INPUT RETURN LOSS vs. FREQUENCY
-6
MAX9990 toc09
MAX9990 toc08
18
115
ISOLATION (dB)
SUPPLY CURRENT (mA)
120
MAX9990 toc10
SUPPLY CURRENT vs. SUPPLY VOLTAGE
-145
-150
-155
-160
1500 1600 1700 1800 1900 2000 2100 2200
FREQUENCY (MHz)
4
5
6
7
8
9
10
11
12
13
INPUT POWER (dBm)
_______________________________________________________________________________________
7
MAX9989/MAX9990
Typical Operating Characteristics (continued)
(VCC = 5.0V, nominal bias, fIN = 1800MHz, PIN = +9dBm, TA = +25°C, unless otherwise noted.) (Shaded regions are outside the
guaranteed operating range, and are provided for reference only.)
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9989/MAX9990
Pin Description
PIN
NAME
FUNCTION
1, 4, 8, 9,
13–18, EP
GND
2
IN
3
VCCREF
5
REF
6
BIASIN
7
BIASOUT
Bias Connection for LO Output Amplifier. Set compressed power point for OUTLO with a resistor to
REF or ground. For +17dBm output power, no external biasing resistors are required. See the
Applications Information section for more information.
10
OUTLO
LO Output. Internally matched 50Ω RF output. AC couple to this pin so as not to disturb output bias
level.
11, 12
VCC2
Supply. Supply connection for OUTLO.
19
VCC1
Supply. Supply connection for input amplifier.
20
OUTPLL
Ground. Provide 5–10 plated vias from EP to system ground plane for optimal thermal and RF
performance.
Input. Internally matched 50Ω RF input. AC couple to this pin so as not to disturb input bias level.
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 the
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 the
Applications Information section for more information.
PLL Output. Output for driving optional external PLL. Requires external 100Ω pullup to VCC for bias.
For applications not requiring the PLL driver, removing R1 leaves OUTPLL unbiased, saving about
12mA current.
Detailed Description
The MAX9989/MAX9990 LO buffers each consist of a
single-input amplifier, an output amplifier, and a second
buffer amplifier to drive the LO’s PLL. The bias currents
for the amplifiers are adjustable through off-chip resistors, allowing the output level to be precision set anywhere from +14dBm to +20dBm. The PLL output is
preset to +3dBm (about 900mVP-P into 50Ω).
Power levels are typically ±1dB over the full supply, input
power, 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 output and the input prevents
VCO pulling.
The MAX9989 is specified from 700MHz to 1100MHz,
and the MAX9990 is specified from 1500MHz to
2200MHz. Both are offered in compact 5mm ✕ 5mm 20pin QFN thin packages with EP.
8
Input Amplifier
A single low-noise input amplifier provides gain and isolation. The compressed output power for this stage is
controlled by the bias setting resistors R2 or R4 (see the
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 50Ω, 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 about +3dBm. If the PLL output
is not required, it can be disabled by removing R1; disabling the PLL output saves 12mA supply current.
_______________________________________________________________________________________
+14dBm to +20dBm LO Buffers
with ±1dB Variation
NOMINAL
OUTPUT POWER
(dBm)
R2 (kΩ)
+20
1.35
Open
+19
2.2
Open
+18
5.0
Open
+17
Open
+16
Open
+15
+14
R5 (kΩ)
MAX9989
INPUT DRIVE
(dBm)
2.0
Open
10 ±3
12 ±3
3.0
Open
9 ±3
11 ±3
6.0
Open
8 ±3
10 ±3
Open
Open
Open
7 ±3
9 ±3
1.8
Open
3.0
6 ±3
8 ±3
Open
0.9
Open
1.1
5 ±3
7 ±3
Open
0.6
Open
0.6
4 ±3
6 ±3
R4 (kΩ)
Table 2. Component Values for Typical
Application Circuit
COMPONENT VALUE
DESIGNATION
MAX9989
(LOWBAND)
MAX9990
(HIGHBAND)
C1, C2, C4, C6, C8,
C9, C10
47pF
22pF
C3, C7, C11
0.1µF
0.1µF
C5
5pF
22pF
R2–R5
See Table 1
See Table 1
R1
100Ω
100Ω
Output Amplifier
The output amplifier is similar to the input amplifier,
except it is biased higher to provide more output power.
For example, with an input power of +10dBm, the
MAX9989 can deliver +20dBm. The bias is adjustable;
see Table 1 for details.
The RF output is internally matched to 50Ω, with a typical VSWR limit of 2:1. Provide DC-blocking capacitors
at the outputs.
R3 (kΩ)
MAX9990
INPUT DRIVE
(dBm)
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 (low band) or 22pF (high band) 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 MAX9989, the typical required input
drive level is +7dBm for +17dBm output, or +10dBm for
+20dBm output. The MAX9990 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 MAX9989/MAX9990 input at the required level
without being load-pulled.
Output Drive Level
The output drive of the MAX9989/MAX9990 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
_______________________________________________________________________________________
9
MAX9989/MAX9990
Table 1. External Resistor Values for +14dBm to +20dBm Output Power
+14dBm to +20dBm LO Buffers
with ±1dB Variation
MAX9989/MAX9990
Typical Application Circuit/Pin Configuration
5.0V
5.0V
C11
C10
C7
C8
C9
20
GND
INPUT FROM LO
IN
19
18
17
GND
GND
GND
VCC1
OUT TO PLL
(+3dBm)
OUTPLL
R1
100Ω
16
1
15
MAX9989
MAX9990
2
14
GND
GND
C1
VCCREF
5.0V
C3
3
13
4
12
GND
C2
GND
VCC2
BIAS
REF
11
5
5.0V
VCC2
C5
R4*
R5*
R2*
OUTLO
10
GND
9
GND
8
BIASOUT
7
BIASIN
6
C6
TO OUTPUT 2
C4
R3*
FOR THESE VALUES, SEE TABLE 1.
FOR CAPACITOR VALUES, SEE TABLE 2.
10
______________________________________________________________________________________
+14dBm to +20dBm LO Buffers
with ±1dB Variation
D2
0.15 C A
D
PIN # 1
I.D.
b
CL
0.10 M C A B
D2/2
D/2
k
0.15 C B
PIN # 1 I.D.
0.35x45
E/2
E2/2
CL
(NE-1) X e
E
E2
k
L
DETAIL A
e
(ND-1) X e
CL
CL
L
L
e
e
0.10 C
A
C
0.08 C
A1 A3
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
APPROVAL
DOCUMENT CONTROL NO.
REV.
21-0140
C
1
______________________________________________________________________________________
2
11
MAX9989/MAX9990
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.)
MAX9989/MAX9990
+14dBm to +20dBm LO Buffers
with ±1dB Variation
Package Information (continued)
(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.)
COMMON DIMENSIONS
EXPOSED PAD VARIATIONS
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.
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.
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE
16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
APPROVAL
DOCUMENT CONTROL NO.
REV.
21-0140
C
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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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