315MHz/434MHz Low-Power, 3V/5V

ASK/FSK Superheterodyne Receiver

8

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PIN

NAME

FUNCTION

6

XTAL1

1st Crystal Input

7

AVDD

Analog Power-Supply Voltage for RF Sections. AVDD is connected to an on-chip +3.0V low-dropout

regulator. Decouple to AGND with a 0.1µF capacitor.

8

LNAIN

Low-Noise Amplifier Input

9

LNASRC

Low-Noise Amplifier Source for External Inductive Degeneration. Connect an inductor to AGND to set

LNA input impedance.

10

LNAOUT

Low-Noise Amplifier Output. Connect to mixer through an LC tank filter.

11

MIXIN+

Differential Mixer Input. Must be AC-coupled to driving input.

12

MIXIN-

Differential Mixer Input. Bypass to AGND with a capacitor.

13

MIXOUT

330

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

14

AGND

Analog Ground

15

IFIN-

Differential 330

Ω IF Limiter Amplifier Input. Bypass to AGND with a capacitor.

16

IFIN+

Differential 330

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

17

PDMINF

Minimum-Level Peak Detector for FSK Data. Connect to ground if peak detector is not used. See the

Peak Detectors section.

18

PDMAXF

Maximum-Level Peak Detector for FSK Data. Connect to ground if peak detector is not used. See the

Peak Detectors section.

19

DSF-

Inverting Data Slicer Input for FSK Data

20

DSF+

Noninverting Data Slicer Input for FSK Data

21

OPF+

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

22

DFF

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

23

DGND

Digital Ground

24

DVDD

Digital Power-Supply Voltage for Digital Sections. Connect to AVDD. Decouple to DGND with a 10nF

capacitor.

25

FDATA

Digital Baseband FSK Demodulator Data Output

26

CS

Active-Low Chip-Select Input

27

DIO

Serial Data Input/Output

28

SCLK

Serial Interface Clock Input

29

HVIN

High-Voltage Supply Input. For 3V operation, connect HVIN to AVDD and DVDD.

30

ADATA

Digital Baseband ASK Demod Data Output

31

PDMINA

Minimum-Level Peak Detector for ASK Output. Connect to ground if peak detector is not used. See the

Peak Detectors section.

32

PDMAXA

Maximum-Level Peak Detector for ASK Output. Connect to ground if peak detector is not used. See the

Peak Detectors section.

—

EP

Exposed Pad. Connect to ground.

Pin Description (continued)