micrf004 Micrel Semiconductor, micrf004 Datasheet
micrf004
Related parts for micrf004
micrf004 Summary of contents
Page 1
... This effectively broadens the RF bandwidth of the receiver to a value equivalent to conventional superregenerative receiv- ers. This allows the MICRF004 to 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 ...
Page 2
... MICRF004/RF044 Pin Configuration MICRF004 SEL0 1 16 SWEN VSSRF 2 15 REFOSC VSSRF 3 14 SEL1 ANT 4 13 CAGC VDDRF 5 12 WAKEB VDDBB 6 11 SHUT CTH VSSBB 16-Pin DIP (N) or SOP (M) Packages 2 Micrel February 9, 2000 ...
Page 3
... VSSBB, or drive the input with an ac-coupled 0.5Vpp input clock. SWEN Sweep-Mode Enable (Input): Sweep- or fixed-mode operation control input. When VSWEN is high, the MICRF004 is in sweep mode; when SWEN is low, the receiver operates as a conventional single-conversion superhetero- dyne receiver. This pin is internally pulled-up to VDDRF. ...
Page 4
... Reference Oscillator Current REFOSC Demodulator Z CTH Source Impedance CTH Z CTH Source Impedance Variation CTH I CTH Leakage Current ZCTH(leak) Demodulator Filter Bandwidth Demodulator Filter Bandwidth MICRF004 Operating Ratings (Note 1) Supply Voltage (V ) .......... V Ambient Temperature (T REFOSC DDBB –0 +0.3 Package Thermal Resistance ( SS DD 16-pin DIP ( ...
Page 5
... T 6.00 (paramter value at 4.65MHz) 4.65 . For any reference oscillator frequency other than 4.65MHz, compute new T = 6.00MHz: T 4.65 (parmeter value at 4.65MHz) 6.00 5 Min Typ Max 8 SS 0. 0. BER (bit error rate). The input signal is MICRF004/RF044 Micrel Units ...
Page 6
... MICRF004/RF044 Typical Characteristics 100 125 150 175 200 225 250 Functional Characteristics MICRF004 Supply Current vs. Frequency = 5V Sweep Mode, Continuous Operation FREQUENCY (MHz) Antenna Impedance ...
Page 7
... Fixed-Mode Operation For applications where the transmit frequency must be accu- rately set (that is, applications where a SAW transmitter is used for its mechanical stability), the MICRF004 may be configured as a standard superheterodyne receiver (fixed mode). Fixed-mode operation receives a narrower band- width making it less susceptable to competing signals. Fixed mode is selected by connecting SWEN to ground which forces the on-chip LO frequency to a fixed value ...
Page 8
... The fixed time period is based on the reference oscillator frequency f 6.00MHz, and varies inversely as f Reference Oscillator All timing and tuning operations on the MICRF004 are de- = rived from the internal Colpitts reference oscillator. Timing T and tuning is controlled through the REFOSC pin in one of three ways: 1 ...
Page 9
... MICRF004/RF044 I/O Pin Interface Circuitry Interface circuitry for the various I/O pins of the MICRF004 are diagrammed in Figures 1 through 6. The ESD protection diodes at all input and output pins are not shown. ANT Pin 3pF ANT 50 6k Active Bias Figure 1. ANT Pin The ANT pin is internally ac-coupled, through a 3pF capaci- tor N-channel MOSFET, as shown in Figure 1 ...
Page 10
... MOSFETs (Q2, Q3). P-channel MOSFET large channel length device which functions essentially as a “weak” pullup to VDDBB. Typical pullup current leading to an impedance to the VDDBB supply of typically 1M . MICRF004 to Internal Circuits to Internal Circuits 10 ...
Page 11
... MICRF004/RF044 Application Information Transmitter Compatibility Generally, the MICRF004 can be operated in sweep mode, using a low-cost ceramic resonator. Sweep mode works with LC-, crystal-, or SAW-based transmitters, without any signifi- cant range difference. In fixed mode a SAW-based or crystal- controlled transmitter must be used. Bypass and Output Capacitors The bypass and output capacitors connected to VSSBB should have the shortest possible lead lengths ...
Page 12
... LO f (3) T 32.25 Connect a ceramic resonator of frequency f pin on the MICRF004. Two-decimal-place accuracy is gener- ally adequate. A crystal may be used. A crystal may be mandatory in some cases to reduce receive frequency ambi- guity if the transmit frequency ambiguity is excessive. Use Equation 3a to compute sweep-mode frequency band coverage (f ): ...
Page 13
... MICRF004/RF044 150MHz Receiver/Decoder Application Figure 7a illustrates a typical application for the MICRF004 VHF Receiver IC. This receiver operates continuously (not duty cycled) in sweep mode, and features 6-bit address decoding and two output code bits. +5V Supply Input C4 Optional Filter 33pf, 33nH L1 C1 4.7µF 2.2µF ...
Page 14
... REF 0.0648 (1.646) 0.0434 (1.102) .250 0.005 (6.350 0.127) 0.025 0.015 (0.635 0.381) 0.130 0.005 (3.302 0.127) 0.020 MIN (0.508) MICRF004 PIN 1 DIMENSIONS: INCHES (MM) 0.020 (0.51) 0.050 (1.27) BSC 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0.394 (10.00) 0.386 (9.80) SEATING PLANE 16-Lead SOP (M) ...
Page 15
... MICRF004/RF044 February 9, 2000 15 Micrel MICRF004/RF044 ...
Page 16
... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MICRF004 + 1 (408) 944-0970 http://www ...