micrf004 Micrel Semiconductor, micrf004 Datasheet - Page 5

• Manufacturer Part Number: micrf004
• Description: Micrf004/micrf044 Qwikradio? Low-power Vhf Receiver
• Manufacturer: Micrel Semiconductor

Symbol
Digital/Control Section
I
V
V
I
V
V
t
t
Note 1.
Note 2.
Note 3.
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10: External signal generator used. When a crystal or ceramic resonator is used, the minimum voltage is 300mVp-p. The reference oscillator
February 9, 2000
MICRF004/RF044
IN(pu)
OUT
R
WAKEB
IN(high)
IN(low)
OUT(high)
OUT(low)
, t
F
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Use appropriate ESD precautions. Meets class 1 ESD test requirements, (human body model HBM), in accor-
dance with MIL-STD-883C, method 3015. Do not operate or store near strong electrostatic fields.
Sensitivity is defined as the average signal level measured at the input necessary to achieve 10
defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded data) at a data rate of 300b/s. The RF input is
assumed to be matched into 50 .
Spurious reverse isolation represents the spurious components which appear on the RF input pin (ANT) measured into 50 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
background noise is appreciably higher than the thermal noise. Background noise refers to other interfering signals, such as FM radio
stations, pagers, etc.
A better indicator of achievable receiver range performance is usually given by its selectivity, often stated as fntermediate 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 reference oscillator frequency f
parameter value as the ratio:
Example: For reference oscillator freqency f
Parameter scales inversely with reference oscillator frequency f
parameter value as the ratio:
Example: For reference oscillator frequency f
Demodulator filter bandwidths are related in a binary manner, so any of the (lower) nominal filter values may be derived simply by dividing this
parameter value by 2, 4, or 8 as desired.
voltage amplitude is a function of the quality of the ceramic or crystal resonator.
Parameter
Input Pull up Current
Input High Voltage
Input Low Voltage
Output Current
Output High Voltage
Output Low Voltage
Output Rise and Fall Times
Wakeup Output Time
(parameter value at 6.00MHz)
(parmeter value at 4.65MHz)
f
f
REFOSC
REFOSC
4.65
4.65
MHz
MHz
(parameter value at 4.65MHz)
(parmeter value at 4.65MHz)
4.65
6.00
6.00
4.65
T
= 6.00MHz:
T
= 6.00MHz:
(parmeter value at 4.65MHz)
(paramter value at 4.65MHz)
Condition
SEL0, SEL1, SWEN, V
SEL0, SEL1, SWEN
SEL0, SEL1, SWEN
DO, WAKEB pins, push-pull
DO, WAKEB pins, I
DO, WAKEB pins, I
DO, WAKEB pins, C
RF
V
SEL0
IN
= TBDdBm,
= V
T
SEL1
. For any reference oscillator frequency other than 4.65MHz, compute new
T
. For any reference oscillator frequency other than 4.65MHz, compute new
5
= V
SWEN
OUT
OUT
LOAD
SHUT
= –1 A
= +1 A
= V
= 15pF
SHUT
= V
SS
= V
SS
-2
BER (bit error rate). The input signal is
0.2V
0.9V
Min
DD
DD
Typ
10
8
4
MICRF004/RF044
0.8V
0.1V
Max
10
DD
DD
Micrel
Units
ms
V
V
V
V
A
A
s