IC1000 Datasheet, PDF (3/4 Pages) RF Monolithics, Inc – Data/Clock Extraction IC

Data/Clock Extraction IC
Pin Desciptions
Pin
Name
Description
This pin is the positive power supply input for the IC1000. This pin should be bypassed with a 1000 pF ceramic capacitor
1
VDD
connected with short leads between this pin and Pin 8. The IC1000 is designed to operate over a 2.7 to 5.0 Vdc power supply
voltage range.
2
Start Detect
This output pin generates a positive pulse 1 to 1.5 bit periods wide upon the detection of the start-of-data pulse sequence.
Data is valid on the first RX Clock pulse following the falling edge of the Start Detect pulse.
3
RX Data
This input pin is driven by a inverting buffer on the ASH transceiver RX Data output pin. The IC1000 RX Clock extraction PLL
and start-of-data detect routines are driven from the input to this pin.
4
NC
This pin is not used and should be left unconnected.
5
RX Clock
The RX Clock signal extracted from the RX Data input is provided on this output pin. The RX Clock pulse occurs near the
middle of each bit period (valid after the falling edge of the Start Detect pulse).
6
Speed 1
This input pin, in conjunction with Speed 0 (Pin 7), selects the data rate for the PLL clock extraction. One of four data rates
can be selected - 2400, 4800, 9600 and 19,200 bits per second. This pin is read once when the IC1000 is powered up.
7
Speed 0
This input pin, in conjunction with Speed 1 (Pin 6), selects the data rate for the PLL clock extraction. One of four data rates
can be selected - 2400, 4800, 9600 and 19,200 bits per second. This pin is read once when the IC1000 is powered up.
8
VSS (GND) This pin is the power supply return pin.
Typical IC1000 Application
8
8.2K
TR-Series
ASH
Transceiver
47K
7
470K
MMBT2222
TX Modulation
Data Out
IC1000
3
Speed 0
7
Speed 1
6
Start Detect
2
RX Clock
5
Host
µP
IRQ
Data Strobe
RX Data
Data In
Figure 1
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IC1000-081402
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