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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
V CC
OSCOUT
LIMOUT,
LIMOUT
TXIN , TXIN
RXEN
TXEN
V CC
GND
RXIN , RXIN
TXOUT , TXOUT
GND
MIXOUT
VREF
FUNCTION
Limiter Input. Connect a 330 ? (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 6k ? , 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 80k ? 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 V CC 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 50 ? load. If a larger output swing is required, a
larger load resistance (up to 100 ?) can be used.
Differential Outputs of the Limiting Amplifier. LIMOUT and LIMOUT are open-collector outputs that
are internally pulled up to V CC through 1k ? resistors.
Differential Inputs of the Image-Reject Upconverter Mixer. TXIN and TXIN are high impedance and
must be pulled up to V CC through two external resistors whose value is equal to the desired termi-
nating impedance (50 ? to 50k ? ).
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 V CC 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 V CC
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 V CC / 2. See the
Typical Operating Circuit for more information.
_______________________________________________________________________________________
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