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1700MHz to 2200MHz High-Linearity,
SPI-Controlled DVGA with Integrated Loopback Mixer
duration of a valid 10-bit data set (t EWN ). This CS nega-
tive pulse width includes the setup time of the rising
clock edge to CS transitioning high (t ES ). See Figure 1.
The 5 MSBs of the 10-bit word program attenuator A,
and the 5 LSBs of the 10-bit word program attenuator
B. Each bit sets the attenuators to a corresponding
attenuation level. For example, logic-low 0 for bit 5 and
bit 0 of attenuator A and B, respectively, sets both
attenuators at 1dB. 00000 configures both attenuators
for maximum attenuation and 11111 sets for minimum
from the EP. In addition, provide the EP with a low-
inductance path to electrical ground. The EP MUST be
soldered to a ground plane on the PC board, either
directly or through an array of plated via holes.
Table 2. Component List Referring to the
Typical Application Circuit
attenuation. See Table 1 for programming details.
External Bias
Bias currents for the two-stage amplifier and the loop-
back mixer are set and optimized with external resistors.
Resistor R1 (pin 31) sets the bias current for the input
amplifier, R2 (pin 20) sets the bias current for the output
amplifier, and R3 (pin 40) sets the bias for the loopback
mixer. The external biasing resistor values can be
COMPONENT
C1, C4, C10, C13,
C16
C2, C3, C5, C8,
C11, C14, C17, C24
C6, C19
C7, C18
VALUE
0.1μF
22pF
120pF
0.01μF
DESCRIPTION
Microwave capacitors (0603)
Microwave capacitors (0402)
Microwave capacitors (0402)
Microwave capacitors (0402)
increased for reduced current operation at the expense
of performance. Contact the factory for details.
C9, C12, C15
C20, C21, C22
1000pF Microwave capacitors (0402)
0.75pF Microwave capacitors (0402)
Board Layout
The pin configuration of the MAX2059 has been opti-
mized to facilitate a very compact physical layout of the
device and its associated discrete components.
The exposed paddle (EP) of the MAX2059’s thin QFN-
EP package provides a low thermal-resistance path to
the die. It is important that the PC board on which the
MAX2059 is mounted be designed to conduct heat
C23
R1
R2, R3
R4
TI
U1
1pF
1.2k Ω
2.0k Ω
110 Ω
2:1
—
Microwave capacitor (0402)
±1% resistor (0402)
±1% resistors (0402)
±1% resistor (0402)
RF transformer (100:50)
Mini-Circuits TC2-1T
MAX2059
MAX2021/MAX2022/MAX2023
MAX5873
MAX4395
ZERO-IF
DUAL DAC
QUAD AMP
MODS/DEMODS
MAX2058/MAX2059
RF DIGITAL VGAs
I
12
90 °
0 °
∑
31dB
18.5dB
31dB
RFOUT
Q
12
SPI
LOGIC
LOOPBACK Rx
SPI
OUT
OFF CONTROL
MAX9491
VCO + PLL
45, 80,
OR
95MHz
(FEEDS BACK
INTO Rx CHAIN
FRONT-END)
LO
Figure 2. Direct Conversion Transmitter for GSM/EDGE Base Stations
12
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