MAX2150ETI+ Maxim Integrated Products, MAX2150ETI+ Datasheet - Page 8

• Manufacturer Part Number: MAX2150ETI+
• Description: Quadrature Mod 75MHz 28-Pin TQFN EP
• Manufacturer: Maxim Integrated Products

Specifications of MAX2150ETI+

• Package: 28TQFN EP
• Device Type: Modulator
• Maximum I/q Frequency: 75(Typ) MHz
• Modulation Type: Quadrature
• Operating Supply Voltage: 3 V

Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
8
8, 9, 10
20, 21
24, 25
PIN
4, 5
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11
12
13
14
15
16
17
18
19
22
23
1
2
3
6
7
CLK, DATA,
VCC_XTAL
VCC_CHP
LO-, LO+
BUFOUT
VCC_PA
VCC_SD
VCC_LO
RFOUT
SYNEN
VCC_D
BUFEN
OSCIN
VCC_A
Q-, Q+
NAME
LOCK
SHDN
TXEN
N.C.
CHP
EN
Modulator Enable Input. Set TXEN low to inhibit the RF and modulator circuits. This mode can be used
for quiet frequency synthesis.
Supply Voltage Input for RFOUT Output Driver Circuits. Bypass as close to the pin as possible. The
bypass capacitor should not share ground vias with other branches.
Modulator RF Output. This is a wideband, internally matched 50Ω output. A DC-blocking capacitor is
required.
Do Not Connect. (These pins must be left floating.)
Lock Status of the PLL. A static logic-level high indicates that the PLL is in the locked condition.
Supply Voltage Input for Sigma-Delta Modulator Circuits. Bypass as close to the pin as possible. The
bypass capacitor should not share ground vias with other branches.
Input Pins from 3-Wire Serial Bus. An RC lowpass filter on each of these pins can be used to reduce
digital noise.
Shutdown Control. Set SHDN low to disable all internal circuits for lowest power consumption. An RC
lowpass filter can be used to reduce digital noise.
Synthesizer Enable Input. Set SYNTH low to disable the internal frequency synthesizer. An RC lowpass
filter can be used to reduce digital noise.
Reference Oscillator Input. Connect a parallel, resonant, fundamental-tone crystal between this pin and
ground to facilitate a crystal oscillator circuit. For applications with an external reference oscillator, the
OSCIN input can be driven through a large-value series capacitor.
Supply Voltage Input for Crystal Oscillator. Bypass as close to the pin as possible. The bypass capacitor
should not share ground vias with other branches.
Supply Voltage Input for Charge Pump. Bypass as close to the pin as possible. The bypass capacitor
should not share ground vias with other branches.
High-Impedance Charge-Pump Output. Connect to the tune input of the VCO through the PLL loop filter.
Keep the line from this pin to the tune input as short as possible to prevent spurious pickup, and
connect the loop filter as close to the tune input as possible.
Supply Voltage Input for PLL. Bypass as close to the pin as possible. The bypass capacitor should not
share ground vias with other branches.
Supply Voltage Input for PLL. Bypass as close to the pin as possible. The bypass capacitor should not
share ground vias with other branches.
Supply Voltage Input for Internal LO Circuits. Bypass as close to the pin as possible. The bypass
capacitor should not share ground vias with other branches.
Differential Local-Oscillator Input. These inputs require DC-blocking capacitors. The LO can be applied
with a single-ended input to the LO+/LO- pin. In this mode, the other pin should be AC-grounded.
Buffered LO Output. Internally matched to 50Ω, requires a DC-blocking capacitor.
LO Output Buffer Amplifier Enable. Set BUFEN high to enable the on-chip output LO buffer for driving
external circuits. An RC lowpass filter can be used to reduce digital noise.
Differential Q-Channel Baseband Inputs to the Modulator. These pins connect directly to the bases of
a differential pair and require an external common-mode bias voltage of 1.6V.
FUNCTION
Pin Description