Philips SA5224D Datasheet
INTEGRATED CIRCUITS
SA5224
FDDI fiber optic postamplifier
Product specification
Replaces datasheet NE/SA5224 of 1995 Apr 26
IC19 Data Handbook
1998 Oct 07
Philips Semiconductors Product specification
SA5224FDDI fiber optic postamplifier
DESCRIPTION
The SA5224 is a high-gain limiting amplifier that is designed to
process signals from fiber optic preamplifiers. Capable of operating
at 125Mb/s, the chip is FDDI compatible and has input signal
level-detection with a user-adjustable threshold. The DATA and
LEVEL-DETECT outputs are differential for optimum noise margin
and ease of use. Also available is the SA5225 which is an ECL 10K
version of the SA5224.
FEA TURES
•Wideband operation: 1.0kHz to 120MHz typical
•Applicable in 155Mb/s OC3/SONET receivers
•Operation with single +5V or –5.2V supply
•Differential 100k ECL outputs
•Programmable input signal level-detection
•Fully differential for excellent PSRR to 1GHz
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
16-Pin Plastic Small Outline (SO) package
PIN DESCRIPTION
D Package
CAZN
CAZP
GND
V
CCA
JAM
1
2
3
A
4
D
IN
5
D
IN
6
CF
7
8
16
V
SET
V
15
REF
14
V
CCE
13
D
OUT
12
D
OUT
11
GND
ST
10
9
ST
SD00374
E
Figure 1. Pin Configuration
APPLICATIONS
•FDDI
•Data communication in noisy industrial environments
•LANs
–40 to +85°C
SA5224D SOT109-1
BLOCK DIAGRAM
V
V
D
D
REF
SET
C
V
(4)
IN
(5)
IN
(15)
(16)
GND
C
AZN
A
AZP
LIMITING
AMPLIFIER
LEVEL
DETECTOR
C
F
ECL
BUFFER
CCA
(6) (2) (1) (16)
REFERENCE
JAM
BUFFER
SD
BUFFER
V
CCE
(11)(7)(3)
GND
(13)
D
OUT
(12)
D
OUT
(8)
JAM
ST
(9)
(10)
ST
SD00375
E
Figure 2. Block Diagram
1998 Oct 07 853-1594 20141
2
Philips Semiconductors Product specification
SA5224FDDI fiber optic postamplifier
PIN DESCRIPTIONS
PIN NO. NAME FUNCTION
1 C
2 C
AZN
AZP
3 GNDAAnalog GND pin. Connect to ground for +5V upshifted ECL operation. Connect to –5.2V for standard ECL
4 D
5 D
6 V
CCA
7 C
8 JAM This ECL-compatible input controls the output buffers D
9
ST
10 ST ECL compliment of ST (Pin 9).
11 GND
12
13 D
14 V
15 V
16 V
D
OUT
OUT
CCE
REF
SET
Auto-zero capacitor pin. Connecting a capacitor between this pin and C
limiting amplifier.
Auto-zero capacitor pin. Connecting a capacitor between this pin and C
limiting amplifier.
will cancel the offset voltage of the
AZP
will cancel the offset voltage of the
AZN
operation. Must be at same potential as GNDE (Pin 11).
Differential input. DC bias level is set internally at approximately 2.9V. Complimentary to DIN (Pin 5).
IN
Differential input. DC bias level is set internally at approximately 2.9V. Complimentary to DIN (Pin 4).
IN
Analog power supply pin. Connect to a +5V supply for upshifted ECL operation. Connect to ground for standard
ECL operation. Must be at same potential as V
Filter capacitor for level detector. Capacitor should be connected between this pin and V
F
is applied, the outputs will follow the input signal. When an ECL HIGH signal is applied, the D
will latch into LOW and HIGH states, respectively. When left unconnected, this pin is actively pulled-low (JAM OFF).
CCE
(Pin 14).
OUT
and D
.
CCA
(Pins 12 and 13). When an ECL LOW signal
OUT
OUT
and D
Input signal level-detect STATUS. This ECL output is high when the input signal is below the user programmable
threshold level.
Digital GND pin. Connect to ground for +5V upshifted ECL operation. Connect to a negative supply for normal ECL
E
operation. Must be at the same potential as GNDA (Pin 3).
ECL-compatible output. Nominal level is V
condition. Complimentary to D
OUT
(Pin 13).
ECL-compatible output. Nominal level is V
condition. Complimentary to D
OUT
(Pin 12).
–1.3V. When JAM is HIGH, this pin will be forced into an ECL HIGH
CCE
–1.3V. When JAM is HIGH, this pin will be forced into an ECL LOW
CCE
Digital power supply pin. Connect to a +5V supply for upshifted ECL operation. Connect to ground during normal
ECL operation. Must be at the same potential as V
CCA
(Pin 6).
Reference voltage for threshold level voltage divider. Nominal value is approximately 2.64V.
Input threshold level setting circuit. This input can come from a voltage divider between V
and GNDA.
REF
OUT
pins
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNITS
T
V
P
CC
T
A
T
J
STG
D
Power supply (VCC - GND) 6 V
Operating ambient –45 to +85
Operating junction –55 to +150
Storage –65 to +150
Power dissipation, TA = 25°C (still air)
16-pin Plastic SO
1
1100 mW
NOTE:
1. Maximum dissipation is determined by the ambient temperature and the thermal resistance,
: 16-pin SO: θJA = 110°C/W
θ
JA
RECOMMENDED OPERATING CONDITIONS
SYMBOL PARAMETER RATING UNITS
V
CC
T
A
T
J
1998 Oct 07
Supply voltage 4.5 to 5.5 V
Ambient temperature ranges –40 to +85
Junction temperature ranges –40 to +110
3
°C
°C
°C
°C
°C
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