MAX2511EEI Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Lista de partido

MAX2511EEI

Low-Voltage IF Transceiver with Limiter and RSSI

Maxim Integrated 

Low-Voltage IF Transceiver

with Limiter and RSSI

______________________________________________________________Pin Description

PIN

1

2, 3

4

5

6, 9

7, 10

8, 11

12

13, 14

15, 16

17

18

19, 21

20

22, 25

23, 24

26

27

28

NAME

LIMIN

CZ, CZ

RSSI

GC

TANK, TANK

GND

VCC

OSCOUT

LIMOUT,

LIMOUT

TXIN, TXIN

RXEN

TXEN

VCC

GND

RXIN, RXIN

TXOUT, TXOUT

GND

MIXOUT

VREF

FUNCTION

Limiter Input. Connect a 330Ω (typ) resistor to VREF for DC bias, as shown in the Typical Operating

Circuit.

Offset-Correction Capacitor pins. Connect a 0.01µF capacitor between CZ and CZ.

Receive-Signal-Strength-Indicator Output. The voltage on RSSI is proportional to the signal power at

LIMIN. The RSSI output sources current pulses into an external capacitor (100pF typ). The output is

internally terminated with 6kΩ, and this RC time constant sets the decay time.

Gain-Control pin in transmit mode. Applying a DC voltage to GC between 0V and 2.0V adjusts the

transmitter gain by 40dB. In receive mode, GC adjusts the limiter output level from 0Vp-p to about

1Vp-p. This pin’s input impedance is typically 80kΩ terminated to 1.35V.

Tank pins. Connect the resonant tank across these pins, as shown in the Typical Operating Circuit.

Ground. Connect GND to the PC board ground plane with minimal inductance.

Supply Voltage. Bypass VCC directly to GND. See the Layout Issues section.

Oscillator-Buffer Output. OSCOUT provides a buffered oscillator signal (at the oscillator frequency)

for driving an external prescaler. This pin is a current output and must be AC-coupled to a resistive

load. The output power is typically -9dBm into a 50Ω load. If a larger output swing is required, a

larger load resistance (up to 100Ω) can be used.

Differential Outputs of the Limiting Amplifier. LIMOUT and LIMOUT are open-collector outputs that

are internally pulled up to VCC through 1kΩ resistors.

Differential Inputs of the Image-Reject Upconverter Mixer. TXIN and TXIN are high impedance and

must be pulled up to VCC through two external resistors whose value is equal to the desired termi-

nating impedance (50Ω to 50kΩ).

Receiver-Enable pin. When high, RXEN enables the receiver if TXEN is low. If both RXEN and TXEN

are high, the part is in standby mode; if both are low, the part is in shutdown. See the Power

Management section for more details.

Transmitter-Enable pin. When high, TXEN enables the transmitter, if RXEN is low. If both TXEN and

RXEN are high, the part is in standby mode; if both are low, the part is in shutdown. See the Power

Management section for more details.

Bias VCC Supply pins. Decouple these pins to GND. See the Layout Issues section.

Receiver/Transmitter Ground pin. Connect to the PC board ground plane with minimal inductance.

Differential Inputs of the Image-Reject Downconverter Mixer. In most applications, an impedance

matching network is required. See the Applications Information section for more details.

Differential Outputs of the Image-Reject Upconverter. TXOUT and TXOUT must be pulled up to VCC

with two external inductors and AC coupled to the load.

Receiver Front-End Ground. Connect GND to the PC board ground plane with minimal inductance.

Single-Ended Output of the Image-Reject Downconverter. MIXOUT is high impedance and must be

biased to the VREF pin through an external terminating resistor whose value depends on the inter-

stage filter characteristics. See the Applications Information section for more details.

Reference Voltage pin. VREF is used to provide an external bias voltage for the MIXOUT and LIMIN

pins. Bypass this pin with a 0.1µF capacitor to ground. VREF voltage is equal to VCC / 2. See the

Typical Operating Circuit for more information.

_______________________________________________________________________________________ 9

Share Link: