OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MICRF103BM

P1-P3P4-P6P7-P7
MICRF103 Micrel
MICRF103 4 June 2002
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. After the release of the STDBY, the device requires an initialization time to settle the REFOSC and the internal PLL. The first MARK state
(ASK HIGH) after exit from STDBY needs to be longer than the initialization time. The subsequent low to high transitions will be treated as
data modulation whereby the envelope transition time will apply.
Note 5. The varactor capacitance tuning range indicates the allowable external antenna component variation to maintain tune over normal production
tolerances of external components. Guaranteed by design not tested in production.
Note 6. For the ASK modulation scheme, the part will accept ASK (digital ON/OFF) input and will transmit the data with a finite extinction ratio and the
pin will set the MARK power level.
Note 7. When the device is first powered up or it loses power momentarily, it goes into the calibration mode to tune up the transmit antenna.
Test Circuit
PC
VDD
VSS
REFOSC ASK
MICRF103
ANTM
ANTP
STBY
100Ω 4:1
680pF
7.1nH
680pF
200Ω
100Ω
50Ω
June 2002 5 MICRF103
MICRF103 Micrel
Typical Characteristics
-50
-40
-30
-20
-10
0
10
20
30
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
MARK P
OUT
(dBm)
V
PC
(V)
Output Power
vs. PC Pin Volta
g
e
0
5
10
15
20
25
30
35
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
MARK I
ON
(mA)
V
PC
(V)
Mark Current
vs. PC Volta
g
e
MICRF103 Micrel
MICRF103 6 June 2002
Functional Description
The block diagram illustrates the basic structure of the
MICRF103. Identified in the figure are the principal functional
blocks of the IC, namely the (1, 2, 3, 4, 5) UHF synthesizer,
(6a/b) Buffer, (7) Antenna tuner, (8) Power amplifier, (9) TX
bias control, (10) Reference bias and (11) Process tuner.
The UHF synthesizer generates the carrier frequency with
quadrature outputs. The in-phase signal (I) is used to drive
the PA and the quadrature signal (Q) is used to compare the
antenna signal phase for antenna tuning purpose.
The antenna tuner block senses the phase of the transmit
signal at the antenna port and controls the varactor capacitor
to tune the antenna.
The power control unit senses the antenna signal and con-
trols the PA bias current to regulate the antenna signal to the
transmit power.
Functional Diagram
TX
Bias
Control
Varactor
Device
Antenna
Tuning
Control
Power
Amp
Buffer
VSS
ANTM
ANTP
ASK
Buffer
Prescaler
÷64
REF.OSC
PC
VDD
VDD
(10)
(5)
(2)
Reference
Oscillator (1)
VCO (4)
(3)
(9)
(8)
(7)
(11)
(6a)
(6b)
STBY
Reference
Bias
Phase
Detector
Figure 2. MICRF103 Block Diagram
The process tune circuit generates process independent bias
currents for different blocks.
Included within the IC is a differential varactor that serves as
the tuning element to insure that the transmit frequency and
antenna are aligned with the receiver over all supply and
temperature variations.
P1-P3P4-P6P7-P7

MICRF103BM

Mfr. #:
Buy MICRF103BM
Manufacturer:
Description:
RF TX IC ASK 800MHZ-1GHZ 8SOIC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet