MAX2511EVKIT Maxim Integrated Products, MAX2511EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX2511EVKIT
• Description: RF Modules & Development Tools MAX2511 EVAL KIT MAX2511 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX2511EVKIT

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

Table 1. Operating Modes
2) Switch the part into Rx mode by moving the RXEN
3) Connect the spectrum analyzer to the OSCOUT
4) Connect an oscilloscope to the limiter output
5) Connect a voltmeter to the RSSI test pad in the
6) Observe that the signal at LIMOUT remains con-
Besides the Tx/Rx modes previously mentioned, the
MAX2511 supports two other operating modes: shut-
down and standby. Bring both TXEN and RXEN
jumpers to the “2-3” position (TXEN = RXEN = GND),
Optionally, the RF generator’s signal can be split
using a 180° balun connected to IF and IF. This
scope load impedance form a 20:1 voltage divider.
The limiter’s output voltage range can be adjusted
by varying the GC voltage.
Note: Ensure that the LO frequency is maintained
at 435.7MHz to keep the IF output centered within
the Rx 10.7MHz filter’s passband.
upper-left corner of the EV kit to monitor the RSSI
output voltage. For -30 dBm of RXIN power, the
RSSI voltage should be approximately 750mV.
Lower the input power in 10dBm steps, observing
the decrease in RSSI output voltage of about
100mV per 10dB change in input power. Increase
RXIN power above -30dBm to verify compression
performance. Return the power to -30dBm.
stant over the RXIN power range.
jumper to the “1” position and the TXEN jumper to the
“3” position (Table 1). Verify that the GC voltage is 2V.
pin, and verify that LO is still at the correct fre-
quency (435.7MHz). Adjust the FADJ pin voltage, if
necessary. Set the RF generator to 425MHz at
-30dBm. Connect the generator to the IF connector.
Terminate the IF with a 50Ω SMA terminator.
connection is the same as the optional balun con-
nection for Tx mode, but the balun is used in the
reverse direction.
LIMOUT, and set its input impedance to 50Ω. The
signal level observed on the oscilloscope should be
around 28mVp-p, which corresponds to 550mVp-p
at the device pin. Note that R5 and the 50Ω oscillo-
Shutdown
Transmit
Receive
Standby
MODE
System Power-Management Features
_______________________________________________________________________________________
RXEN
2–3
2–3
1–2
1–2
JUMPER SETTING
TXEN
2–3
1–2
2–3
1–2
MAX2511 Evaluation Kit
putting the part in shutdown mode and reducing supply
current to around 0.1µA.
To enter standby mode, bring both TXEN and RXEN
jumpers to the “1-2” position, so that TXEN = RXEN =
V
while leaving the oscillator and other circuitry active (for
fast switching into either Rx or Tx mode).
The following section covers the EV kit’s circuit blocks
in detail (see the MAX2511 data sheet for additional
information).
The TXIN and TXIN pins are differential inputs to the
MAX2511’s image-reject transmitter. The EV kit is
shipped configured for single-ended operation at the
TXIN connector. To convert to differential operation,
populate C12 with a 47nF capacitor, and install an SMA
connector. The input impedance of these pins is set by
pull-up resistors R7 and R8. This input is typically a
10.7MHz signal at 100mVp-p.
The MAX2511’s Tx output pins (TXOUT and TXOUT)
are high-impedance open collectors; therefore, external
inductors are used for proper biasing. DC-blocking
capacitors are used to connect to these outputs.
TXOUT and TXOUT are connected to the SMA connec-
tors IF and IF. Consult the schematic diagram for more
information. C18, C19, L2, and L3 act only to provide
biasing and DC blocking; they do not set the output
impedance. Refer to the MAX2511 data sheet for more
information on designing a matching network for this
port.
The Rx input pins (RXIN and RXIN) do not require
external DC biasing. Capacitors C16 and C17 provide
DC blocking. On the EV kit, they are connected in a
shared configuration with the Tx outputs, at the IF and
IF SMA connectors (see Figure 2 for more information).
The receive downconverter mixer’s output appears at
the MIXOUT pin—a current source that can drive a
165Ω load to 2Vp-p. The MIXOUT pin is terminated with
330Ω (R10 + R11) for proper match to the bandpass fil-
ter (Z
330Ω
The EV kit design allows separate testing of the Rx
mixer and limiter sections of the MAX2511. Coupling
capacitor C20 is used to connect the node between
R10 and R11 to an external SMA connector. This
_______________Detailed Description
CC
. This reduces the supply current to about 9.5mA
O
= 330Ω). Therefore, the net load at MIXOUT is
330Ω = 165Ω.
Rx Output and Limiter Input
Tx Outputs
Tx Inputs
Rx Input
3