Page 1
INTEGRATED CIRCUITS
SA5214
Postamplifier with link status indicator
Product specification
Replaces datasheet NE/SA5214 of 1995 Apr 26
IC19 Data Handbook
1998 Oct 07
Page 2
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
DESCRIPTION
The SA5214 is a 75MHz postamplifier system designed to accept
low level high-speed signals. These signals are converted into a
TTL level at the output. The SA5214 can be DC coupled with the
previous transimpedance stage using SA5210, SA5211 or SA5212
transimpedance amplifiers. This “system on a chip” features an
auto-zeroed first stage with noise shaping, a symmetrical limiting
second stage, and a matched rise/fall time TTL output buffer. The
system is user-configurable to provide noise filtering, adjustable
input thresholds and hysteresis. The threshold capability allows the
user to maximize signal-to-noise ratio, insuring a low Bit Error Rate
(BER). An Auto-Zero loop can be used to minimize the number of
external coupling capacitors to one. A signal absent flag indicates
when signals are below threshold. Additionally, the low signal
condition forces the overall TTL output to a logical Low level. User
interaction with this “jamming” system is available. The SA5214 is
packaged in a standard 20-pin surface-mount package and typically
consumes 42mA from a standard 5V supply. The SA5214 is
designed as a companion to the SA5211/5212 transimpedance
amplifiers. These differential preamplifiers may be directly coupled
to the post-amplifier inputs. The SA5212/5214 or SA5211/5214
combinations convert nanoamps of photodetector current into
standard digital TTL levels.
APPLICATIONS
•Fiber optics
•Communication links in Industrial and/or Telecom environment
with high EMI/RFI
•Local Area Networks (LAN)
•Metropolitan Area Networks (MAN)
•Synchronous Optical Networks (SONET)
•RF limiter
PIN CONFIGURATION
D1 Package
1
LED
PKDET
THRESH
GND
FLAG
JAM
V
CCD
V
CCA
GND
V
OUT
2
3
4
A
5
6
7
8
9
D
10
TOP VIEW
C
NOTE:
1. SOL – Released in large SO package only.
20
19
18
17
16
15
14
13
12
11
IN
1B
IN
1A
C
AZP
C
AZN
OUT
1B
IN
2B
OUT
1A
IN
2A
R
HYST
R
PKDET
SD00349
Figure 1. Pin Configuration
FEATURES
•Postamp for the SA5211/5212 preamplifier family
•Wideband operation: typical 75MHz (100MBaud NRZ)
•Interstage filtering/equalization possible
•Single 5V supply
•Low signal flag
•Low signal output disable
•Link status threshold and hysteresis programmable
•LED driver (normally ON with above threshold signal)
•Fully differential for excellent PSRR
•Auto-zero loop for DC offset cancellation
•2kV ElectroStatic Discharge (ESD) protection
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
20-Pin Plastic Small Outline Large (SOL) Package -40°C to +85°C SA5214D SOT163-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNIT
V
CCA
V
CCD
T
A
T
J
T
STG
P
D
V
IJ
1998 Oct 07 853-1657 20142
Power supply +6 V
Power supply +6 V
Operating ambient temperature range -40 to +85 °C
Operating junction temperature range -55 to +150 °C
Storage temperature range -65 to +150 °C
Power dissipation 300 mW
Jam input voltage -0.5 to 5.5 V
2
Page 3
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
PIN DESCRIPTIONS
PIN
SYMBOL DESCRIPTION
NO.
1 LED Output for the LED driver. Open collector output transistor with 125Ω series limiting resistor. An above threshold signal
turns this transistor ON.
2 C
PKDET
3 THRESH Peak detector threshold resistor. The value of this resistor determines the threshold level of the peak detector.
4 GND
5 FLAG Peak detector digital output. When this output is LOW, there is data present above the threshold. This pin is normally
6 JAM Input to inhibit data flow. Sending the pin HIGH forces TTL DATA OUT ON, Pin 10, LOW. This pin is normally connected
7 V
CCD
8 V
CCA
9 GND
10 V
OUT
11 R
PKDET
12 R
HYST
13 IN
2A
14 OUT
15 IN
2B
16 OUT
17 C
AZN
18 C
AZP
19 IN
1A
20 IN
1B
Capacitor for the peak detector. The value of this capacitor determines the detector response time to the signal,
supplementing the internal 10pF capacitor.
Device analog ground pin.
A
connected to the JAM pin and has a TTL fanout of two.
to the FLAG pin and is TTL-compatible.
Power supply pin for the digital portion of the chip.
Power supply pin for the analog portion of the chip.
Device digital ground pin.
D
TTL output pin with a fanout of five.
Peak detector current resistor. The value of this resistor determines the amount of discharge current available to the
peak detector capacitor, C
PKDET
.
Peak detector hysteresis resistor. The value of this resistor determines the amount of hysteresis in the peak detector.
Non-inverting input to amplifier A2.
Non-inverting output of amplifier A1.
1A
Inverting input to amplifier A2.
Inverting output of amplifier A1.
1B
Auto-Zero capacitor pin (Negative terminal). The value of this capacitor determines the low-end frequency response of
the preamp A1.
Auto-Zero capacitor pin (Positive terminal). The value of this capacitor determines the low-end frequency response of the
preamp A1.
Non-inverting input of the preamp A1.
Inverting input of the preamp A1.
BLOCK DIAGRAM
1998 Oct 07
C
C
R
PKDET
IN
IN
AZP
AZN
1B
1A
OUT
IN
1B
D
2B
16 1514 13
THRESH
OUT
1A
20
A1 A2
19
18
17
11
9
43
GNDAGND
Figure 2. Block Diagram
IN
2A
GATED AMP
PEAK DETECT
A3
C
PKDET
3
V
CCD
A4
HYSTERESIS
2
V
CCA
87
OUTPUT BUFFER
OUTPUT DISABLE
A6
A7
12
R
HYST
A8
A5
LED DRIVER
10
6
5
1
SD00350
V
OUT
JAM
FLAG
LED
Page 4
Philips Semiconductors Product specification
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
SA5214Postamplifier with link status indicator
RECOMMENDED OPERATING CONDITIONS
SYMBOL PARAMETER RATING UNIT
V
CCA
V
CCD
T
A
T
J
P
D
DC ELECTRICAL CHARACTERISTICS
Min and Max limits apply over the operating temperature range at V
V
CCA=VCCD
I
CCA
I
CCD
V
I1
V
O1
A
V1
A1
A1
V
I2
V
OH
V
OL
I
OH
I
OL
I
OS
V
THRESH
V
RPKDET
V
RHYST
V
IHJ
V
ILJ
I
IHJ
I
ILJ
V
OHF
V
OLF
I
OHF
I
OLF
I
SCF
I
LEDH
=+5.0V and TA=25°C.
PSRR
CMRR
Supply voltage 4.75 to 5.25 V
Power supply 4.75 to 5.25 V
Ambient temperature range -40 to +85 °C
Operating junction temperature range -40 to +110 °C
Power dissipation 250 mW
CCA=VCCD
=+5.0V unless otherwise specified. Typical data applies at
LIMITS
Min Typ Max
Analog supply current 30 41.2 mA
Digital supply current
(TTL, Flag, LED)
A1 input bias voltage
(+/- inputs)
A1 output bias voltage
(+/- outputs)
A1 DC gain
(without Auto-Zero)
A1 PSRR (v
CCA
, V
CCD
) V
CCA=VCCD
3.08 3.4 3.70 V
3.10 3.8 4.50 V
=4.75 to 5.25V 60 dB
10 13.5 mA
30 dB
A1 CMRR ∆VCM=200mV 60 dB
A2 input bias voltage
(+/- inputs)
3.56 3.7 3.86 V
High-level TTL output voltage IOH=-200µA 2.4 3.4 V
Low-level TTL output voltage IOL=8mA 0.3 0.4 V
High-level TTL output current V
Low-level TTL output current V
Short-circuit TTL output current V
=2.4V -40 -24.4 mA
OUT
=0.4V 7.0 30 mA
OUT
=0.0V -95 mA
OUT
Threshold bias voltage Pin 3 Open 0.75 V
RPKDET Pin 11 Open 0.72 V
RHYST bias voltage Pin 12 Open 0.72 V
High-level jam input voltage 2.0 V
Low-level jam input voltage 0.8 V
High-level jam input current VIJ=2.7V 30 µA
Low-level jam input current VIJ=0.4V -485 -240 µA
High-level flag output voltage IOH=-80µA 2.4 3.8 V
Low-level flag output voltage IOL=3.2mA 0.33 0.4 V
High-level flag output current V
Low-level flag output current V
Short-circuit flag output current V
LED ON maximum sink current V
=2.4V -18 -5 mA
OUT
=0.4V 3.25 10 mA
OUT
=0.0V -61 -40 -26 mA
OUT
=3.0V 8 22 80 mA
LED
1998 Oct 07
4
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Philips Semiconductors Product specification
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
SA5214Postamplifier with link status indicator
AC ELECTRICAL CHARACTERISTICS
Min and Max limits apply over the operating temperature range at V
V
CCA
f
OP
BW
V
V
R
C
R
C
R
C
V
V
t
TLH
t
THL
t
RFD
t
PWD
A1
INH
INL
IN1
IN1
IN2
IN2
OUT1
OUT1
HYS
THR
= V
= +5.0V and T
CCD
Maximum operating frequency Test circuit 60 75 MHz
Small signal bandwidth (differential
OUT
Maximum Functional A1
input signal (single ended)
Minimum Functional A1
input signal (single ended)
Input resistance
(differential at IN
Input capacitance (differential at IN1) 2 pF
Input resistance
(differential at IN
Input capacitance (differential at IN2) 2 pF
Output resistance (differential at OUT1) 25 Ω
Output capacitance (differential at
OUT
Hysteresis voltage Test circuit 3 mV
Threshold voltage range (FLAG ON)
TTL Output Rise Time
20% to 80%
TTL Output Fall Time
80% to 20%
t
TLH/tTHL
Pulse width distortion of output 50mV
= 25°C.
A
/IN1)
1
)
1
)
2
)
1
mismatch 0.1 ns
, 1010. . .input
P-P
Distortion= TH-T
CCA
Test circuit, @ 50MHz R
R
L
TH+T
L
NOTES:
1. The SA5214 is capable of detecting a much lower input level. Operation under 12mV
testers.
= V
= +5.0V unless otherwise specified. Typical data applies at
CCD
LIMITS
Min Typ Max
Test circuit 75 MHz
Test Circuit 1.6 V
Test CIrcuit
1
12 mV
1200 Ω
1200 Ω
2 pF
=5k
THRESH
RHYST
=47k
12 mV
Test Circuit 1.3 ns
Test Circuit 1.2 ns
2
10
2.5 2.5 %
cannot be guaranteed by present day automatic
P-P
P-P
P-P
P-P
P-P
1998 Oct 07
5
Page 6
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
V
CC
100µH
100µH
+5V
0.1µF
125
47k
0.1µF
10
1
2
3
4
5
6
7
8
9
NE5214
LED
C
PKDET
THRESH
GND
A
FLAG
JAM
V
CCD
V
CCA
GND
D
V
OUT
OUT
OUT
R
R
PKDET
IN
1B
IN
1A
C
AZP
C
AZN
1B
IN
2B
1A
IN
2A
HYST
5k
0.1µF
0.1µF
25
V
IN
50
20
19
18
17
0.1µF
16
15
14
13
12
11
10k
10µF
V
OUT
Figure 3. AC Test Circuit
TYPICAL PERFORMANCE CHARACTERISTICS
Analog Supply Current vs Temperature Digital Supply Current vs Temperature
36
34
32
30
28
ANALOG SUPPLY CURRENT (mA)
26
24
–60 –40 –20 0 20 40 60 80 100 120
Threshold Voltage vs R
22
21
20
19
18
17
16
THRESHOLD (mVp–p)
15
14
13
12
20 30 40 50
TEMPERATURE (°C)
R
THRESH
VCC = 5.25V
VCC = 5.00V
VCC = 4.75V
THRESH
R
= 5k
HYST
(kΩ)
Figure 4. Typical Performance Characteristics
15pF
400
SD00351
12.0
11.5
11.0
VCC = 5.25V
10.5
10.0
DIGITAL SUPPLY CURRENT (mA)
9.5
9.0
–60 –40 –20 0 20 40 60 80 100 120
Hysteresis Voltage vs R
4
3
2
HYSTERSIS (mVp–p)
1
0
3
TEMPERATURE (°C)
4
R
HYST
VCC = 5.00V
VCC = 4.75V
HYST
R
THRESH
567
(kΩ)
= 47Ω
SD00352
1998 Oct 07
6
Page 7
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
+V
CC
47µF
C1
GND
10µH
L3
10µH
L2
C10
10µF
C12
10µF
R2
220
C9
R3
47k
C11
.01µF
.01µF
D1
LED
100pF
C13
V
OUT
LED
1
C
2
PKDET
THRESH
3
GND
A
4
FLAG
5
JAM
6
V
CCD
7
V
CCA
8
GND
D
9
TTL
10 11
OUT
(TTL)
OUT
NE5214
OUT
R
R
PKDET
C2
IN
1B
IN
1A
C
AZP
C
AZN
1B
IN
2B
1A
IN
2A
HYST
.01µF
L1
µH
10
C7
20
19
18
17
16
15
14
13
12
0.1µF
100pF
C8
R4
5.1k
GND
9
GND
GND
10
GND
11
OUT
12
13
GND
OUT
14
V
78
CC
C4
6
V
CC
NC
I
IN
NE5211
NC
GND
GND
.01µF
5
4
3
2
1
10µF
R1
100
C3
1.0µF
.01µF
BPF31
OPTICAL
INPUT
C5
C6
NOTE:
The NE5211/NE5214 combination can operate at data rates in excess of 100Mb/s NRZ.
Figure 5. A 50Mb/s Fiber Optic Receiver
THEORY OF OPERATION AND APPLICATION INFORMATION
The SA5214 postamplifier system is a highly integrated chip that
provides up to 60dB of gain at 60MHz, to bring mV level signals up
to TTL levels.
The SA5214 contains eight amplifier blocks (see Block Diagram).
The main signal path is made up of a cascade of limiting stages: A1,
A2 and A8. The A3-A4-A7 path performs a wideband full-wave
rectification of the input signal with adjustable hysteresis and decay
times. It outputs a TTL HIGH on the “FLAG” output (Pin 5) when the
input is below a user adjustable threshold. An on-chip LED driver
turns the external LED to the ON state when the input signal is
above the threshold. In a typical application the “FLAG” output is tied
back to the “JAM” input; this forces the TTL data OUT into a LOW
state when no signal is present at the input.
An auto zero loop allows the SA5214 to be directly connected to a
transimpedance amplifier such as the SA5210, SA5211, or SA5212
without coupling capacitors. This auto-zero loop cancels the
transimpedance amplifier’s DC offset, the SA5214 A1 offset, and the
data-dependent offset in the PIN diode/transimpedance amplifier
combination. For more information on the SA5214 Theory of
SD00353
Operation, please refer to paper titled “A Low Cost 100 MBaud
Fiber-Optic Receiver” by W. Mack et al.
A typical application of the SA5214 postamplifier is depicted in
Figure 5. The system uses the SA5211 transimpedance amplifier
which has a 28k differential transimpedance gain and a -3dB
bandwidth of 140MHz. This typical application is optimized for a 50
Mb/s Non Return to Zero (NRZ) bit stream.
As the system’s gain bandwidth product is very high, it is crucial to
employ good RF design and printed circuit board layout techniques
to prevent the system from becoming unstable.
For more information on this application, please refer to AB 1432.
Die Sales Disclaimer
Due to the limitations in testing high frequency and other parameters
at the die level, and the fact that die electrical characteristics may
shift after packaging, die electrical parameters are not specified and
die are not guaranteed to meet electrical characteristics (including
temperature range) as noted in this data sheet which is intended
only to specify electrical characteristics for a packaged device.
1998 Oct 07
7
Page 8
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
All die are 100% functional with various parametrics tested at the
wafer level, at room temperature only (25°C), and are guaranteed to
be 100% functional as a result of electrical testing to the point of
wafer sawing only. Although the most modern processes are
utilized for wafer sawing and die pick and place into waffle pack
carriers, it is impossible to guarantee 100% functionality through this
process. There is no post waffle pack testing performed on
individual die.
Since Philips Semiconductors has no control of third party
procedures in the handling or packaging of die, Philips
LED
C
PKDET
GNDA
THRESH
2
3
1
Semiconductors assumes no liability for device functionality or
performance of the die or systems on any die sales.
Although Philips Semiconductors typically realizes a yield of 85%
after assembling die into their respective packages, with care
customers should achieve a similar yield. However, for the reasons
stated above, Philips Semiconductors cannot guarantee this or any
other yield on any die sales.
IN1B
IN1A
CAZP
20
19
18
CAZN
FLAG
JAM
V
CCD
ECN No.: 94620
1988 Sep 28
V
CCA
4
5
6
7
8
9
GNDD
V
OUT
10
11
R
PKDET
12
R
HYST
17
OUT1B
16
15
IN2B
14
13
IN2A
OUT1A
SD00490
1998 Oct 07
Figure 6. SA5214 Bonding Diagram
8
Page 9
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1998 Oct 07
9
Page 10
Philips Semiconductors Product specification
SA5214Postamplifier with link status indicator
Data sheet status
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
[1]
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
Date of release: 10-98
Document order number: 9397 750 04626
1998 Oct 07
10
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