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Integrated Circuit Systems, Inc.
ICS9120-46
Modem and Audio Clock Generator
General Description
The ICS9120-46 is a high performance frequency generator designed to support the clock requirements of communication and audio interfaces. It offers the clock frequencies required by 28.8 baud modem plus sound system. These frequencies are synthesized from 14.7456 MHz reference oscillator whose buffered output is available for the reference. High accuracy, low-jitter PLLs meet the -96dB signal-tonoise ratios required by 16-bit audio systems. Fast output clock edge rates minimize board induced jitter. The on-chip XTAL oscillator accuracy is better than 100ppm for an AT cut, 18pF load crystal with initial accuracy of ppm plus TC, aging and load variation of 20ppm each assuming 33pF 5% external load capacitors. * * * * * * * *
Features
Generates 49.92 MHz, 40.32 MHz and 14.7456 MHz Single 14.7456 MHz crystal reference 49.92 MHz accuracy tracks 40.32 MHz reference 80ps one sigma jitter maintains 16-bit performance Output rise/fall times less than 1.5ns On-chip loop filter components 3.0-5.5V supply range 8-pin, 150-mil SOIC package
Applications
* Specifically designed to support the high performance requirements of communication and audio interfaces.
Block Diagram
9120-46 Rev B 052497P
ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate.
ICS9120-46
Pin Configuration
Functionality
The ICS9120-46 incorporates a crystal oscillator circuit designed to provide 50% duty cycle over a range of operating conditions, including the addition of external crystal load capacitors to pins X1 and X2. For the crystal oscillator, the crystal load capacitance must be connected externally by adding a capacitor from each of the X1 and X2 pins to ground. A parallel resonant 14.7456 MHz crystal is recommended. Duty cycle is also maintained when using an external clock source (connected to X1, X2 left unconnected) as long as the external clock has good duty cycle.
8-Pin SOIC
Functionality
X1 (MHz) 14.7456 PD# 0 1 CLK1 (MHz) Low 49.92 CLK2 (MHz) Low 40.32 REF (MHa) Low 14.7456
Pin Descriptions for ICS9120-46
PIN N UM BER PIN N AM E T YPE D ESC RIPTIO N
1 2 3 4 5 6 7 8
X1 V DD G ND C LK1 PD # C LK2 R EF X2
Input Pow er Pow er O utput O utput O utput O utput O utput
Crystal or external clock source. H as feedback bias for crystal. N om inally 14.7456 M H z input applied. (N o internal load cap; m ust connect external load cap to ground for crystal oscillator.) +Pow er supply input. G round return for Pin 2. 49.92 M H z target output clock (w ith nom inal 14.7456 M H z input). Power-down input. A ll outputs shut off and driven to low output state w hen this pin is at logic low level. H as pull-up. 40.32 M H z target output clock. 14.7456 M Hz reference clock buffered output (w ith nom inal 14.7456 M H z input). Crystal output drive (leave this pin unconnected when using an external clock). (N o internal load cap; m ust connect external load cap to ground for crystal oscillator).
2
ICS9120-46
Absolute Maximum Ratings
AVDD, VDD referenced to GND .......................................................................... 7V Operating temperature under bias .................................................... 0 oC to +70oC Storage temperature ..................................................................... -65oC to +150 oC Voltage on I/O pins referenced to GND ...................... GND -0.5V to VDD +0.5V Power dissipation ...................................................................................... 0.5 Watts Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Electrical Characteristics at 5 V
VDD = +4.5 to +5.5 V, T A = 0 to 70oC unless otherwise stated
PARAMETER Input Low Voltage Input High Voltage Input Low Current Input High Current Output Low Voltage Output High Voltage Output Low Current Output High Current Supply Current Supply Current Power-down Pull-up Resistor Value Rise Time Fall Time Rise Time Fall Time Duty Cycle Duty Cycle Jitter, One Sigma Jitter, Absolute Jitter, One Sigma Jitter Absolute Input Frequency Range Output Frequency Range Power-up Time Crystal Input Capacitance
SYMBOL VIL VIH I IL IIH VOL VOH IOL IOH IDD IDDPD Rpu Tr Tf* Tr Tf Dt Dt Tjis Tjab Tjis Tjab Fi Fo Tpu Cinx
DC Characteristics TEST CONDITIONS
VIN=0V VIN=VDD IOL=+10mA IOH=-30mA VOL=0.8V VOH=2.4V Unloaded Unloaded; Pin 5=0V
AC Characteristics 15pF load 0.8 to 2.0V 15pF load 2.0 to 0.8V 15pF load 20% to 80% 15pF load 80% to 20% 15pF load @ 50% of VDD; Except REFCLK 15pF load @ 50% of VDD; REFCLK only For all frequencies except REFCLK For all frequencies except REFCLK REFCLK only REFCLK only
MIN 2.0 -18.0 2.4 25.0 45.0 40.0 300.0 -1.0 11.0 11.0 -
TYP -8.3 0.15 3.7 45.0 -53.0 27.0 500.0 400.0 0.8 0.6 1.7 1.1 50.0 45.0 70.0 270 350.0 0.8 14.0 5.5 5
MAX 0.8 5.0 0.4 -35.0 50.0 800.0 800.0 2.0 1.5 3.0 2.5 55.0 60.0 90.0 300.0 500.0 1.0 17.0 58.0 12.0 -
UNITS V V A A V V mA mA mA A k ohm ns ns ns ns % % ps ps ps ns MHz MHz ms pF
0 to 40.3 MHz X1 (Pin 1),X2 (Pin 8)
*Parameter is guaranteed by design and characterization. Not 100% tested in production. 3
ICS9120-46
Electrical Characteristics at 3.3 V
VDD = +3.0 to +3.7V, TA = 0O C-70oC unless otherwise stated
PARAMETER Input Low Voltage Input High Voltage Input Low Current Input High Current Output Low Voltage Output High Voltage Output Low Current Output High Current Supply Current Supply Current Powerdown Pull-up Resistor Value Rise Time Fall Time Rise Time Fall Time Duty Cycle Duty Cycle Jitter, One Sigma Jitter Absolute Jitter, One Sigma Jitter, Absolute Input Frequency Range Output Frequency Range Power-up Time Crystal Input Capacitance
SYMBOL VIL VIH IIL IIH VOL VOH IOL IOH IDD IDDPD Rpu Tr Tf* Tr Tf Dt Dt Tj1s Tjab Tj1s Tjab Fi Fo Tpu Cinx
DC Characteristics TEST CONDITIONS
VIN=0V VIN=VDD IOL=6.0mA IOH=4.0mA VOL=0.2VDD VOH=0.7VDD Unloaded Unloaded; Pin 5=0V
AC Characteristics 15pF load 0.8 to 2.0V 15pF load 2.0 to 0.8V 15pF load 20% to 80% 15pF load 80% to 20% 15pF load @ 50% of VDD; Except REFCLK 15pF load @ 50% of VDD; REFCLK only For all frequencies except REFCLK For all frequencies except REFCLK REFCLK only REFCLK only
MIN TYP 0.7VDD -8.0 -3.6 0.05VDD 0.85VDD 0.94VDD 15.0 24.0 -13.0 20.0 45.0 40.0 -350.0 -1.0 11.0 14.0 200.0 620.0 2.2 1.2 2.3 1.2 50.0 45.0 80.0 300.0 380.0 0.8 14.745 5.5 5
MAX 0.2VDD 5.0 1.1 -8.0 40.0 400.0 900.0 3.5 2.5 4.0 3.0 55.0 60.0 100.0 350.0 500.0 1.0 15.0 51.0 12.0 -
UNITS V V A A V V mA mA mA A k ohm ns ns ns ns % % ps ps ps ns MHz MHz ms pF
0 to 40.3 MHz X1 (Pin 1), X2 (Pin 8)
*Parameter is guaranteed by design and characterization. Not 100% tested in production.
4
ICS9120-46
8 Pin SOIC Package
Ordering Information
ICS9120M-46
Example:
ICS XXXX M-PPP
Pattern Number(2 or 3 digit number for parts with ROM code patterns) Package Type
M=SOIC
Device Type (consists of 3 or 4 digit numbers) Prefix
ICS=Standard Device
5
ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate.

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