MAX9988ETP Maxim Integrated Products, MAX9988ETP Datasheet - Page 10

• Manufacturer Part Number: MAX9988ETP
• Description: RF Amplifier +14dBm to +20dBm LO Buffers-Splitters wi
• Manufacturer: Maxim Integrated Products
• Type: LO Buffer/Splitterr

Specifications of MAX9988ETP

• Operating Supply Voltage: 5 V
• Supply Current: 221 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFN-20 EP
• Minimum Operating Temperature: - 40 C

+14dBm to +20dBm LO Buffers/Splitters
with ±1dB Variation
Table 1. External Resistor Values for +14dBm to +20dBm Output Power
Table 2. Component Values for Typical
Application Circuit
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 out-
puts. The bias is adjustable; see Table 1 for details.
Both RF outputs are internally matched to 50Ω, with a
typical VSWR limit of 2:1. Provide DC blocking capacitors
at the outputs.
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.
10
C2, C4, C5, C7, C8,
C9, C12, C13, C14
OUTPUT POWER
DESIGNATION
R1, R2, R4, R5
______________________________________________________________________________________
NOMINAL
C10, C11
(dBm)
C1, C6
+20
+19
+18
+17
+16
+15
+14
C3
R3
Applications Information
Driver Amplifiers and Outputs
Input and Output Matching
(LOWBAND)
See Table 1
MAX9987
R
1.35k
Open
Open
Open
Open
2.2k
5.0k
100pF
100nF
1
100
47pF
5pF
( )
COMPONENT VALUE
(HIGHBAND)
R
See Table 1
Open
Open
Open
Open
2.0k
3.0k
6.0k
MAX9988
2
100nF
100nF
( )
100
22pF
10pF
R
Open
Open
Open
Open
1.8k
0.9k
0.6k
4
( )
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 pro-
vide sufficient drive by itself; the typical application fol-
lows 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.
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.
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 pad underneath the
package. This pad must be connected to the ground
plane of the board by using multiple vias under the
device to provide the best RF/thermal conduction path.
Solder the exposed pad on the bottom of the device
package to a PC board exposed pad.
TRANSISTOR COUNT: 89
PROCESS: BiCMOS
R
Open
Open
Open
Open
3.0k
1.1k
0.6k
5
( )
INPUT DRIVE
Layout Considerations
MAX9987
(dBm)
Chip Information
10 ±3
9 ±3
8 ±3
7 ±3
6 ±3
5 ±3
4 ±3
Output Drive Level
Input Drive Level
INPUT DRIVE
MAX9988
(dBm)
12 ±3
11 ±3
10 ±3
9 ±3
8 ±3
7 ±3
6 ±3