max9989etpt Maxim Integrated Products, Inc., max9989etpt Datasheet - Page 9

• Manufacturer Part Number: max9989etpt
• Description: +14dbm To +20dbm Lo Buffers With ?1db Variation
• Manufacturer: Maxim Integrated Products, Inc.

Table 1. External Resistor Values for +14dBm to +20dBm Output Power
Table 2. Component Values for Typical
Application Circuit
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 typi-
cal VSWR limit of 2:1. Provide DC-blocking capacitors
at the outputs.
C1, C2, C4, C6, C8,
OUTPUT POWER
DESIGNATION
C3, C7, C11
NOMINAL
C9, C10
(dBm)
R2–R5
+20
+19
+18
+17
+16
+15
+14
C5
R1
_______________________________________________________________________________________
(LOWBAND)
See Table 1
R2 (kΩ)
MAX9989
Open
Open
Open
Open
1.35
2.2
5.0
0.1µF
100Ω
47pF
5pF
COMPONENT VALUE
Output Amplifier
R4 (kΩ)
(HIGHBAND)
Open
Open
Open
Open
See Table 1
+14dBm to +20dBm LO Buffers
MAX9990
1.8
0.9
0.6
0.1µF
100Ω
22pF
22pF
R3 (kΩ)
Open
Open
Open
Open
2.0
3.0
6.0
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 com-
ponent values can optimize performance for a particu-
lar band.
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 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 MAX9989/MAX9990 input at the required level
without being load-pulled.
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.
TRANSISTOR COUNT: 89
PROCESS: BiCMOS
with ±1dB Variation
R5 (kΩ)
Open
Open
Open
Open
3.0
1.1
0.6
Applications Information
Input and Output Matching
INPUT DRIVE
MAX9989
(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
MAX9990
(dBm)
12 ±3
11 ±3
10 ±3
9 ±3
8 ±3
7 ±3
6 ±3
9