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MICRF003BM TR: 产品描述IC receiver uhf 900mhz 16-soic; 产品类别热门应用无线/射频/通信; 文件大小213KB，共16页; 制造商Microchip(微芯科技); 官网地址https://www.microchip.com

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MICRF003BM TR概述

IC receiver uhf 900mhz 16-soic

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MICRF003 / 033

QwikRadio

900 MHz UHF Receiver

Preliminary Information

General Description

The MICRF003 is a single chip OOK (ON-OFF Keyed) Receiver IC for

remote wireless applications, employing Micrel’s latest QwikRadio

technology. This device is a true “antenna-in, data-out” monolithic device. All

RF and IF tuning is accomplished automatically within the IC, which

eliminates manual tuning, and reduces production costs. Receiver functions

are completely integrated. The result is a highly reliable yet extremely low

cost solution for high volume wireless applications. Because the MICRF003

is a true single-chip radio receiver, it is extremely easy to apply, minimizing

design and production costs, and improving time to market.

The MICRF003 provides two fundamental modes of operation, FIXED and

SWP.

In FIXED mode, the device functions like a conventional

Superheterodyne receiver, with an (internal) local oscillator fixed at a single

frequency based on an external reference crystal or clock. As with any

conventional superheterodyne receiver, the

transmit

frequency must be

accurately controlled, generally with a crystal or SAW (Surface Acoustic

Wave) resonator.

In SWP mode, the MICRF003 sweeps the (internal) local oscillator at rates

greater than the baseband data rate. This effectively “broadens” the RF

bandwidth of the receiver to a value equivalent to conventional super-

regenerative receivers. Thus the MICRF003 can operate with less

expensive LC transmitters without additional components or tuning, even

though the receiver topology is still superheterodyne. In this mode the

reference crystal can be replaced with a less expensive

0.5% ceramic

resonator.

The MICRF003 provides two additional key features: (1) a Shutdown Mode,

which may be used for duty-cycle operation, and (2) a “Wakeup” function,

which provides a logical indication of an incoming RF signal. These features

make the MICRF003 ideal for low and ultra-low power applications, such as

RKE and RFID.

All post-detection (demodulator) data filtering is provided on the MICRF003,

so no external filters need to be designed. Any one of four filter bandwidths

may be selected externally by the user. Nominal filter bandwidths range in

binary steps, from 0.75kHz to 6kHz (SWP mode) or 2.8kHz to 22.4kHz

(FIXED mode). The user only needs to program the appropriate filter

selection based on data rate and code modulation format.

Features

•

Complete 900 MHz Band receiver on a monolithic IC

UHF Frequency range 800 to 1000 MHz

Typical range over 170 meters with monopole antenna

Data rates to 5kbps (SWP), 20kbps (FIXED)

Automatic tuning, no manual adjustment

No Filters or Inductors required

Low Operating Supply Current--4mA @ 868MHz

Shutdown

Mode for Duty-Cycle Operation in excess of

100:1

Wakeup

Function to Enable External Decoders and

Microprocessors

Very low RF re-radiation at the antenna

CMOS logic interface to standard decoder and

microprocessor ICs

Extremely low external part count

Applications

•

Automotive Remote Keyless Entry

Security Systems

Low Rate Data Modems

Remote Meter Data Collection

Typical Operating Circuit

915 MHz, 2400 bps OOK

ISM Band RECEIVER

Micrel Inc. • 1849 Fortune Drive San Jose, Ca 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

MICRF003

QwikRadio

Micrel

Pin Description

(Pin numbers for the 8-pin version are identified in parentheses)

Pin Number

2/3

Pin Name

SEL0

VSSRF

Pin Function

This pin, in conjunction with SEL1, programs the desired Demodulator Filter Bandwidth. This pin is internally

pulled-up to VDDRF. See Table 1.

This pin is the ground return for the RF section of the IC. The bypass capacitor connected from VDDRF to

VSSRF should have the shortest possible lead length. For best performance, connect VSSRF to VSSBB at the

power supply only (i.e., keep VSSBB currents from flowing through VSSRF return path).

This pin is the ground return for the IC. The bypass capacitor connected from VDDRF to VSSRF should have

the shortest possible lead length.

This is the receive RF input, internally ac-coupled. Connect this pin to the receive antenna. Input impedance is

high (FET gate) with approximately 2pF of shunt (parasitic) capacitance. For applications located in high

ambient noise environments, a fixed value band-pass network may be connected between the ANT pin and

VSSRF to provide additional receive selectivity and input overload protection. (See

“Application Note TBD”.)

This pin is the positive supply input for the RF section of the IC. VDDBB and VDDRF should be connected

directly at the IC pins. Connect a low ESL, low ESR decoupling capacitor from this pin to VSSRF, as short as

possible.

This pin is the positive supply input for the baseband section of the IC. VDDBB and VDDRF should be

connected directly at the IC pins.

This pin is the positive supply input for the IC. Connect a low ESL, low ESR decoupling capacitor from this pin

to VSSRF, as short as possible.

This capacitor extracts the (DC) average value from the demodulated waveform, which becomes the reference

for the internal data slicing comparator. Treat this as a low-pass RC filter with source impedance of nominally

90kohms ( for REFOSC frequency Ft = 6.75MHz, see

“Application Note TBD”).

A standard

20% X7R

ceramic capacitor is generally sufficient.

Unused Pin

This is the ground return for the baseband section of the IC. The bypass and output capacitors connected to

VSSBB should have the shortest possible lead lengths. For best performance, connect VSSRF to VSSBB at

the power supply only (i.e., keep VSSBB currents from flowing through VSSRF return path).

The output data signal. CMOS level compatible.

A logic input for Shutdown Mode control. Pull this pin low to place the IC into operation. This pin in internally

pulled-up to VDDRF.

An output signal, active low when the IC detects an incoming RF signal, determined by monitoring for data

preamble. CMOS level compatible.

Integrating capacitor for on-chip AGC (Automatic Gain Control). The Decay/Attack time-constant (TC) ratio is

nominally set as 10:1. Use of 0.47uF or greater is strongly recommended for best range performance. Use

low-leakage type capacitors for duty-cycle operation (Dip Tantalum, Ceramic, Polyester). (See

“Application Note

TBD.)

This pin, in conjunction with SEL0, programs the desired Demodulator Filter Bandwidth. This pin in internally

pulled-up to VDDRF. See Table 1.

This is the timing reference for on-chip tuning and alignment. Connect either a ceramic resonator or crystal

(mode dependent) between this pin and VSSBB, or drive the input with an AC coupled 0.5Vpp input clock. Use

ceramic resonators without integral capacitors. Note that if operating in FIXED mode, a crystal must be used;

however in SWP mode, one may use either a crystal or ceramic resonator. See

“Application Note TBD”

for

details on frequency selection and accuracy.

This logic pin controls the operating mode of the MICRF003. When SWEN = HIGH, the MICRF003 is in SWP

mode. When SWEN = LOW, the device operates as a conventional single-conversion superheterodyne

receiver. (See

“Application Note TBD”

for details.) This pin is internally pulled-up to VDDRF.

(1)

(2)

VSSRF

ANT

VDDRF

(3)

(4)

VDDBB

VDDRF

CTH

N/C

VSSBB

(5)

(6)

(7)

SHUT

WAKEB

CAGC

(8)

SEL1

REFOSC

SWEN

SEL0

SEL1

SWP Mode

6000

3000

1500

750

Demodulator Bandwidth (Hz)

FIXED Mode

22400

11200

5600

2800

Table 1

Nominal Demodulator (Baseband) Filter Bandwidth

vs. SEL0, SEL1 and Mode

October 1999

MICRF003

MICRF003

Note 1:

QwikRadio

Micrel

Note 2:

Note 3:

Sensitivity is defined as the average signal level measured at the input necessary to achieve 10e-2 Bit Error Rate (BER). The input

signal is defined as a return-to-zero (RZ) waveform with 50% average duty cycle (e.g., Manchester Encoded Data) at a data rate of

600bps. The RF input is assumed to be matched into 50Ω.

Spurious reverse isolation represents the spurious components which appear on the RF input (ANT) pin measured into 50Ω with an

input RF matching network.

Sensitivity, a commonly specified Receiver parameter, provides an indication of the Receiver’s input referred noise, generally input

thermal noise. However, it is possible for a more sensitive receiver to exhibit range performance no better than that of a less

sensitive receiver, if the “ether” noise is appreciably higher than the thermal noise. “Ether” noise refers to other interfering “noise”

sources, such as FM radio stations, pagers, etc.

A better indicator of achievable receiver range performance is usually given by its Selectivity, often stated as Intermediate Frequency

(IF) or Radio Frequency (RF) bandwidth, depending on receiver topology. Selectivity is a measure of the rejection by the receiver of

“ether” noise. More selective receivers will almost invariably provide better range. Only when the receiver selectivity is so high that

most of the noise on the receiver input is actually thermal will the receiver demonstrate sensitivity-limited performance.

Parameter scales linearly with REFOSC frequency Ft. For any REFOSC frequency other than 6.75MHz, compute new parameter

value as the ratio [(REFOSC FREQ (in MHz)) / 6.75] * [Parameter Value @ 6.75MHz]. Example: For REFOSC Freq. Ft =

7.12MHz, [Parameter Value @ 7.12MHz] = (7.12 / 6.75) * [Parameter Value @ 6.75MHz].

Parameter scales inversely with REFOSC frequency Ft. For any REFOSC frequency other than 6.75MHz, compute new parameter

value as the ratio [6.75 / (REFOSC FREQ (in MHz))] * [Parameter Value @ 6.75MHz]. Example: For REFOSC Freq. Ft =

7.12MHz, [Parameter Value @ 7.12MHz] = (6.75 / 7.12) * [Parameter Value @ 6.75MHz].

Demod filter bandwidths are related in a binary manner, so any of the other (lower) nominal filter values may be derived simply by

dividing this parameter value by 2, 4, or 8 as desired.

Note 4:

Note 5:

Note 6:

October 1999

MICRF003

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