MAX2058ETL+ Maxim Integrated Products, MAX2058ETL+ Datasheet - Page 13

• Manufacturer Part Number: MAX2058ETL+
• Description: RF Mixer IC DVGA SPI HI LIN gh Linearity, SPI-Co
• Manufacturer: Maxim Integrated Products

Specifications of MAX2058ETL+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 31dB attenuation and 11111 sets for 0dB attenua-
tion. See Table 1 for programming details.
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
increased for reduced current operation at the expense
of performance. Contact the factory for details.
The pin configuration of the MAX2058 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 MAX2058’s thin QFN-
EP package provides a low thermal-resistance path to
the die. It is important that the PC board on which the
MAX2058 is mounted be designed to conduct heat
Figure 2. Direct Conversion Transmitter for GSM/EDGE Basestations
SPI-Controlled DVGA with Integrated Loopback Mixer
Q
I
12
12
*FUTURE PRODUCTS—CONTACT FACTORY FOR SAMPLES
MAX5873
DUAL DAC
______________________________________________________________________________________
QUAD AMP
MAX4395
External Bias
Board Layout
700MHz to 1200MHz High-Linearity,
MAX2021/MAX2022/MAX2023*
MODS/DEMODS
ZERO-IF
90°
0°
∑
VCO + PLL
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.
MAX9491*
Table 2. Component List Referring to the
Typical Application Circuit
C1, C4, C10, C13,
C3, C6, C14, C19
C2, C5, C8, C17
COMPONENT
C9, C12, C15
C7, C18
C16
C11
R1
R2
R3
R4
U1
T1
95MHz
45, 80,
OR
LO
31dB
MAX2058/MAX2059*
RF DIGITAL VGAs
INTO Rx CHAIN
(FEEDS BACK
FRONT-END)
LOOPBACK
VALUE
1000pF
3.92kΩ
0.01µF
100pF
1.2kΩ
2.0kΩ
0.1µF
3.9pF
110Ω
47pF
OUT
2:1
—
17.5dB
OFF
Rx
Microwave capacitors (0603)
Microwave capacitors (0402)
Microwave capacitors (0402)
Microwave capacitors (0402)
Microwave capacitors (0402)
Microwave capacitor (0402)
±1% resistor (0402)
±1% resistor (0402)
±1% resistor (0402)
±1% resistor (0402)
RF transformer (100:50)
Mini-Circuits TC2-1T
MAX2058 MAXIM IC
CONTROL
LOGIC
SPI
SPI
31dB
DESCRIPTION
RF OUT
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