MICRF213
3.3V, QwikRadio
®
315MHz Receiver
General Description
The MICRF213 is a general purpose, 3.3V QwikRadio
Receiver that operates at 315MHz with typical sensitivity
of -110dBm.
The MICRF213 functions as a super-heterodyne
receiver for OOK and ASK modulation up to 7.2kbps.
The down-conversion mixer also provides image
rejection. All post-detection data filtering is provided on
the MICRF213. Any one of four filter bandwidths may be
selected externally by the user using binary steps (from
1.18kHz to 9.44kHz, Manchester Encoded). The user
need only configure the device with a set of easily
determined values, based upon data rate, code
modulation format, and desired duty-cycle operation.
Features
•
•
•
•
•
•
•
•
Up to –110dBm sensitivity, 1kbps and BER 10E-02
Image Rejection Mixer
Frequency from 300MHz to 350MHz
Low current consumption: 3.9mA @ 315MHz,
continuous on data rates to 7.2kbps (Manchester
Encoded)
Analog RSSI Output
No IF filter required
Excellent selectivity and noise rejection
Low external part count
Ordering Information
Part Number
MICRF213AYQS
Temperature Range
–40° to +105°C
Package
16-Pin QSOP
Typical Application
ANT1
230 mm (9.1 inches)
1
C3
1.8pF
2
3
4
+3.3V
L1
39nH
C8
6.8pF
L2
68nH
C5
0.1µF
5
6
7
8
U1 MICRFAYQS
RO1
RO2
GNDRF
NC
ANT
RSSI
GNDRF
CAGC
VDD
CTH
SQ
SEL1
SEL0
DO
SHDN
GND
16
15
14
13
12
11
10
9
Y1
9.81563MHz
DO
C6
0.47µF
C4
4.7µF
315MHz, 1kHz Baud Rate Example
QwikRadio is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2007
M9999-052307-A
(408) 944-0800
Micrel, Inc.
MICRF213
Pin Configuration
RO1
GNDRF
ANT
GNDRF
VDD
SQ
SEL0
SHDN
1
2
3
4
5
6
7
8
MICRF213AYQS
16 RO2
15 NC
14 RSSI
13 CAGC
12 CTH
11 SEL1
10 DO
9 GND
Pin Description
16-Pin
QSOP
1
2
3
4
5
6
7
8
9
10
11
12
Pin
Name
RO1
GNDRF
ANT
GNDRF
VDD
SQ
SEL0
SHDN
GND
DO
SEL1
CTH
Pin Function
Reference resonator input connection to Colpitts oscillator stage. May also be driven by external reference
signal of 1.5V p-p amplitude maximum.
Negative supply connection associated with ANT RF input.
RF signal input from antenna. Internally AC-coupled. It is recommended that a matching network with an
inductor-to-RF ground is used to improve ESD protection.
Negative supply connection associated with ANT RF input.
Positive supply connection for all chip functions.
Squelch control logic input with an active internal pull-up when not shut down.
Logic control input with active internal pull-up. Used in conjunction with SEL1 to control the demodulator low
pass filter bandwidth. (See filter table for SEL0 and SEL1 in application section)
Shutdown logic control input. Active internal pull-up.
Negative supply connection for all chip functions except RF input.
Demodulated data output.
Logic control input with active internal pull-up. Used in conjunction with SEL0 to control the demodulator low
pass filter bandwidth. (See filter table for SEL0 and SEL1 in application subsection)
Demodulation threshold voltage integration capacitor connection. Tie an external capacitor across CTH pin
and GND to set the settling time for the demodulation data slicing level. Values above 1nF are
recommended and should be optimized for data rate and data profile.
AGC filter capacitor connection. CAGC capacitor, normally greater than 0.47uF, is connected from this pin to
GND
Received signal strength indication output. Output is from a buffer with 200 ohms typical output impedance.
Not Connected (Connect to Ground)
Reference resonator input connection to Colpitts oscillator stage, 7pF, in parallel with low resistance MOS
switch-to-GND, during normal operation. Driven by startup excitation circuit during the internal startup control
sequence.
13
14
15
16
CAGC
RSSI
NC
RO2
May 2007
2
M9999-052307-A
(408) 944-0800
Micrel, Inc.
MICRF213
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
) .................................................+5V
Input Voltage .............................................................+5V
Junction Temperature ......................................... +150ºC
Lead Temperature (soldering, 10sec.) .................. 260°C
Storage Temperature (T
S
) .....................-65°C to +150°C
Maximum Receiver Input Power ........................+10dBm
EDS Rating
(3)
.................................................. 3KV HBM
Operating Ratings
(2)
Supply voltage (V
DD
).............................+3.0V to +3.6V
Ambient Temperature (T
A
)................ –40°C to +105°C
Input Voltage (V
IN
) ...................................... 3.6V (Max)
Maximum Input RF Power .............................. –20dBm
Electrical Characteristics
(4)
Specifications apply for 3.0V < V
DD
< 3.6V, V
SS
= 0V, C
AGC
= 4.7µF, C
TH
= 0.47µF, f
RX
= 315 MHz unless otherwise noted.
Bold
values indicate –40°C - T
A
- 105°C. 900bps data rate (Manchester encoded), reference oscillator frequency = 9.81563 MHz.
Symbol
I
DD
I
SHUT
Parameter
Operating Supply Current
Shut down Current
Image Rejection
1
st
IF Center Frequency
Receiver Sensitivity @
1kbps
IF Bandwidth
Antenna Input
Impedance
Receive Modulation Duty
Cycle
AGC Attack / Decay
Ratio
AGC pin leakage current
AGC Dynamic Range
Reference Oscillator
Reference Oscillator
Frequency
Reference Oscillator
Input Impedance
Reference Oscillator
Input Range
Reference Oscillator
Source Current
f
RX
= 315MHz
Crystal Load Cap = 10pF
9.81563
300
0.2
V(REFOSC) = 0V
3.5
1.5
MHz
kΩ
Vp-p
µA
f
RX
= 315MHz
f
RX
= 315MHz (matched to 50Ω) BER=10
-2
f
RX
= 315MHz
f
RX
= 315MHz
Note 5
t
ATTACK
/ t
DECAY
T
A
= 25ºC
T
A
= +105ºC
RF
IN
@ -50dBm
RF
IN
@ -110dBm
20
0.1
±2
±800
1.13
1.70
nA
nA
V
V
Condition
Continuous Operation, f
RX
= 315MHz
Min
Typ
3.9
0.33
20
0.86
-110
235
32.5 –
j235
80
Max
Units
mA
µA
dB
MHz
dBm
kHz
Ω
%
RF/IF Section
May 2007
3
M9999-052307-A
(408) 944-0800
Micrel, Inc.
MICRF213
Symbol
Parameter
Condition
Min
Typ
Max
Units
Demodulator
CTH Source Impedance
CTH Leakage Current
Demodulator Filter
Bandwidth @ 315MHz
(Programmable, see
application section)
Digital / Control Functions
DO pin output current
Output rise and fall times
RSSI
RSSI DC Output Voltage
Range
RSSI response slope
RSSI Output Current
RSSI Output Impedance
RSSI Response Time
Notes:
1.
2.
3.
4.
5.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside of its operating rating.
Device is ESD sensitive. Use appropriate ESD precautions. Exceeding the absolute maximum rating may damage the device.
Sensitivity is defined as the average signal level measured at the input necessary to achieve 10-2 BER (bit error rate). The input signal is
defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded) at a data rate of 1kbps.
When data burst does not contain preamble, duty cycle is defined as total duty cycle, including any “quiet” time between data bursts. When
data bursts contain preamble sufficient to charge the slice level on capacitor C
TH
, then duty cycle is the effective duty cycle of the burst alone.
[For example, 100msec burst with 50% duty cycle, and 100msec “quiet” time between bursts. If burst includes preamble, duty cycle is
Ton/(Ton+Toff) = 50%; without preamble, duty cycle is Ton/(Ton+ Toff + Tquiet) = 50msec/(200msec)=25%. Ton is the (Average number of
1’s/burst) x bit time, and Toff = Tburst -Ton.)
F
REFOSC
= 9.81563MHz
T
A
= 25ºC
T
A
= +105ºC
SEL0=0, SEL1=0
SEL0=1, SEL1=0
SEL0=0, SEL1=1
SEL0=1, SEL1=1
source @ 0.8Vdd
sink @ 0.2Vdd
CI = 15pF, pin DO, 10-90%
-110dBm to -50dBm
-110dBm to -50dBm
±15
50% data duty cycle, input power to Antenna = -
20 dBm
As output
165
±2
±800
1180
2360
4720
9400
260
600
2
0.4 – 1.9
25
400
200
0.3
kΩ
nA
nA
Hz
µA
µsec
V
mV/dB
µA
Ω
Sec
May 2007
4
M9999-052307-A
(408) 944-0800
Micrel, Inc.
MICRF213
Typical Characteristics
Sensitivity Graphs
RSSI Voltage
vs. Input Power
DC Current
vs. Frequency
Selectivity
vs. Frequency Response
2.5
2.0
4.5
0
-10
-20
4.0
1.5
1.0
3.5
0.5
0
-120 -100 -80
-60
-40
INPUT POWER (dBm)
3.0
280
-30
-40
-50
-60
-70
-80
-90
304
-20
300
320
340
FREQUENCY (MHz)
360
308 312 316 320 324
FREQUENCY (MHz)
-106
-108
-110
-112
-114
Sesitivity
vs. BER
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
AGC Voltage
vs. Input Power
-116
1.00E-04 1.00E-03 1.00E-02 1.00E-01
BER
1
-150
-100
-50
INPUT POWER (dBm)
0
May 2007
5
M9999-052307-A
(408) 944-0800
综合技术交流
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
