MICRF103YM Micrel Inc, MICRF103YM Datasheet - Page 6

• Manufacturer Part Number: MICRF103YM
• Description: IC ASK TRANSMITTER UHF 8SOIC
• Manufacturer: Micrel Inc

Specifications of MICRF103YM

• Frequency: 800MHz ~ 1GHz
• Applications: RKE
• Modulation Or Protocol: ASK, OOK
• Data Rate - Maximum: 115 kbps
• Power - Output: -3dBm
• Current - Transmitting: 19mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.75 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Transmitting Current: 27.5mA
• Data Rate: 115Kbps
• Frequency Range: 800MHz To 1GHz
• Modulation Type: ASK
• Rf Ic Case Style: SOIC
• No. Of Pins: 8
• Supply Voltage Range: 4.75V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 576-1339

MICRF103
Functional Diagram
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.
MICRF103
REF.OSC
STBY
VDD
PC
VDD
Oscillator (1)
Reference
Detector
Phase
Reference
Bias
(2)
(10)
Figure 2. MICRF103 Block Diagram
Prescaler
(3)
64
(5)
VCO (4)
6
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.
Control
Bias
TX
(9)
Buffer
Buffer
(6a)
(6b)
Antenna
Control
Tuning
(7)
Power
Amp
(8)
Varactor
Device
(11)
ASK
ANTP
ANTM
VSS
June 2002
Micrel