Pin description – Rainbow Electronics MAX7030 User Manual

Page 11

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MAX7030

Low-Cost, 315MHz, 345MHz, and 433.92MHz

ASK Transceiver with Fractional-N PLL

______________________________________________________________________________________

11

Pin Description

PIN

NAME

FUNCTION

1

PAV

DD

Power-Amplifier Supply Voltage. Bypass to GND with 0.01µF and 220pF capacitors placed as close
to the pin as possible.

2

ROUT

Envelope-Shaping Output. ROUT controls the power-amplifier envelope’s rise and fall times. Connect
ROUT to the PA pullup inductor or optional power-adjust resistor. Bypass the inductor to GND as
close to the inductor as possible with 680pF and 220pF capacitors, as shown in the Typical
Application Circuit
.

3

TX/RX1

Transmit/Receive Switch Throw. Drive T/R high to short TX/RX1 to TX/RX2. Drive T/R low to disconnect
TX/RX1 from TX/RX2. Functionally identical to TX/RX2.

4

TX/RX2

Transmit/Receive Switch Pole. Typically connected to ground. See the Typical Application Circuit.

5

PAOUT

Power-Amplifier Output. Requires a pullup inductor to the supply voltage (or ROUT if envelope
shaping is desired), which can be part of the output-matching network to an antenna.

6

AV

DD

Analog Power-Supply Voltage. AV

DD

is connected to an on-chip +3.0V regulator in 5V operation.

Bypass AV

DD

to GND with a 0.1µF and 220pF capacitor placed as close to the pin as possible.

7

LNAIN

Low-Noise Amplifier Input. Must be AC-coupled.

8

LNASRC

Low-Noise Amplifier Source for External Inductive Degeneration. Connect an inductor to GND to set
the LNA input impedance.

9

LNAOUT

Low-Noise Amplifier Output. Must be connected to AV

DD

through a parallel LC tank filter. AC-couple

to MIXIN+.

10

MIXIN+

Noninverting Mixer Input. Must be AC-coupled to the LNA output.

11

MIXIN-

Inverting Mixer Input. Bypass to AV

DD

with a capacitor as close to the LNA LC tank filter as possible.

12

MIXOUT

330

Ω Mixer Output. Connect to the input of the 10.7MHz filter.

13

IFIN-

Inverting 330

Ω IF Limiter-Amplifier Input. Bypass to GND with a capacitor.

14

IFIN+

Noninverting 330

Ω IF Limiter-Amplifier Input. Connect to the output of the 10.7MHz IF filter.

15

PDMIN

Minimum-Level Peak Detector for Demodulator Output

16

PDMAX

Maximum-Level Peak Detector for Demodulator Output

17

DS-

Inverting Data Slicer Input

18

DS+

Noninverting Data Slicer Input

19

OP+

Noninverting Op-Amp Input for the Sallen-Key Data Filter

20

DF

Data-Filter Feedback Node. Input for the feedback capacitor of the Sallen-Key data filter.

21, 25

N.C.

No Connection. Do not connect to this pin.

22

T/R

Transmit/Receive. Drive high to put the device in transmit mode. Drive low or leave unconnected to
put the device in receive mode. It is internally pulled down.

23

ENABLE

Enable. Drive high for normal operation. Drive low or leave unconnected to put the device into shut-
down mode.

24

DATA

Receiver Data Output/Transmitter Data Input

26

DV

DD

Digital Power-Supply Voltage. Bypass to GND with a 0.01µF and 220pF capacitor placed as close to
the pin as possible.

27

HV

IN

High-Voltage Supply Input. For 3V operation, connect HV

IN

to AV

DD

, DV

DD

, and PAV

DD

. For 5V

operation, connect only HV

IN

to 5V. Bypass HV

IN

to GND with a 0.01µF and 220pF capacitor placed

as close to the pin as possible.

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