PT7C4050 Datasheet, PDF (3/13 Pages) Pericom Semiconductor Corporation – PLL with Integrated VCXO

Data Sheet
PT7C4050
PLL with Integrated VCXO
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Pin Description
Pin
Sym
Description
1 X1
Crystal oscillator connected between X1 and X2
2 VC
Control voltage input. It controls crystal oscillator (VCXO).
3 NC
Not connected.
4 AGND
Analog ground.
5 OPN
Negative input. terminal to internal operational amplifier.
6 OPOUT
Output. terminal of internal operational amplifier.
7 OPP
Positive input. terminal to internal operational amplifier.
8 S1
9 S2
S1, S2, S3 Options for selectable divider N
10 S3
11
LOS-IN1
(LOSIN)
12 PHO
13
REF-CLK1
(DATAIN)
14
FB-CLK
(CLKIN)
15 DGND
TTL input. Internal pull down. Normally this pin is connected to OUT1 and selects REF-CLK1
input
Output. signal produced by phase detector of data.
Input clock signal. to phase detector
(TTL switching thresholds for recovering DATAIN)
TTL switching thresholds input. Connected to external feedback clock.
Digital ground.
16 LOS
Loss of signal detection. for DATAIN input. Refer to LOS detection description.
17
RCLK
(CLK-OUT3)
Output recovered clock.
18
RDATA
(CLK-OUT4)
Output recovered data stream.
19 DVDD
Digital power supply.
20^*1 CLK-OUT2 Output clock of internal VCXO frequency controlled by S3, S2, S1 while S4 set logic high
21 HIZ
TTL input. When set to a logic low, output pins CLK-OUT1, CLK-OUT2, RCLK, and RDATA
buffers are set to high-impedance state. When set to logic high or no connection, the device
functions and output pins CLK-OUT1, CLK-OUT2, RCLK, and RDATA etc. are active. This input
has an internal pull-up resistor.
22 CLK-OUT1 Output clock. of internal VCXO or half VCXO frequency, controlled by SEL-OUT1.
23^*2 SEL-OUT1
CMOS input. ‘LO’ selects half of internal VCO frequency. ‘HI’ selects internal VCO frequency.
Internal pull up.
24 GND
Ground.
25
AVDD
(XT-VDD)
Analog power supply.
26 NC
Not connected.
27 NC
Not connected.
28 X2
Crystal oscillator connected between X1 and X2
Note:
*¹: S3, S2, S1 option for selectable divider N, Please refer to Table 1
*²: SEL-OUT1 option for VCXO or half VCXO output freq. Please refer to Table 2
( ): For pin11/13/14/17/18/25, die option
PT0239L (06/07)
3
Ver: 0