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SA5214 Postamplifier with link status indicator
Product specification Replaces datasheet NE/SA5214 of 1995 Apr 26 IC19 Data Handbook 1998 Oct 07
Philips Semiconductors
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
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.
PIN CONFIGURATION
D1 Package
LED 1 20 IN1B 19 IN1A 18 CAZP 17 CAZN 16 OUT 1B 15 IN2B 14 OUT 1A 13 IN2A 12 RHYST 11 R PKDET
CPKDET 2 THRESH 3 GNDA 4 FLAG 5
JAM 6 VCCD 7
VCCA 8 GNDD 9 VOUT 10 TOP VIEW NOTE: 1. SOL - Released in large SO package only.
SD00349
Figure 1. Pin Configuration
FEATURES
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
* 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 20-Pin Plastic Small Outline Large (SOL) Package TEMPERATURE RANGE -40C to +85C ORDER CODE SA5214D DWG # SOT163-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCCA VCCD TA TJ TSTG PD VIJ Power supply Power supply Operating ambient temperature range Operating junction temperature range Storage temperature range Power dissipation Jam input voltage PARAMETER RATING +6 +6 -40 to +85 -55 to +150 -65 to +150 300 -0.5 to 5.5 UNIT V V C C C mW V
1998 Oct 07
2
853-1657 20142
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
PIN DESCRIPTIONS
PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 SYMBOL LED CPKDET THRESH GNDA FLAG JAM VCCD VCCA GNDD VOUT RPKDET RHYST IN2A OUT1A IN2B OUT1B CAZN CAZP IN1A IN1B DESCRIPTION Output for the LED driver. Open collector output transistor with 125 series limiting resistor. An above threshold signal turns this transistor ON. Capacitor for the peak detector. The value of this capacitor determines the detector response time to the signal, supplementing the internal 10pF capacitor. Peak detector threshold resistor. The value of this resistor determines the threshold level of the peak detector. Device analog ground pin. Peak detector digital output. When this output is LOW, there is data present above the threshold. This pin is normally connected to the JAM pin and has a TTL fanout of two. Input to inhibit data flow. Sending the pin HIGH forces TTL DATA OUT ON, Pin 10, LOW. This pin is normally connected 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. 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, CPKDET. 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. Inverting input to amplifier A2. Inverting output of amplifier A1. 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
OUT1A OUT1B IN2B IN2A 14 16 15 13 VCCD 7 GATED AMP A2 VCCA 8 OUTPUT BUFFER A8 10 VOUT
IN1B IN1A CAZP CAZN
20 19 18 17 A1
A6
OUTPUT DISABLE 6
JAM
PEAK DETECT 11 A4 5 FLAG
RPKDET
A3
A5 A7
1
LED
LED DRIVER
HYSTERESIS 4 GNDA 9 GNDD 3 THRESH 2 CPKDET 12 RHYST
SD00350
Figure 2. Block Diagram
1998 Oct 07
3
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
RECOMMENDED OPERATING CONDITIONS
SYMBOL VCCA VCCD TA TJ PD Supply voltage Power supply Ambient temperature range Operating junction temperature range Power dissipation PARAMETER RATING 4.75 to 5.25 4.75 to 5.25 -40 to +85 -40 to +110 250 UNIT V V C C mW
DC ELECTRICAL CHARACTERISTICS
Min and Max limits apply over the operating temperature range at VCCA=VCCD=+5.0V unless otherwise specified. Typical data applies at VCCA=VCCD=+5.0V and TA=25C. SYMBOL ICCA ICCD VI1 VO1 AV1 A1PSRR A1CMRR VI2 VOH VOL IOH IOL IOS VTHRESH VRPKDET VRHYST VIHJ VILJ IIHJ IILJ VOHF VOLF IOHF IOLF ISCF ILEDH PARAMETER Analog supply current Digital supply current (TTL, Flag, LED) A1 input bias voltage (+/- inputs) A1 output bias voltage (+/- outputs) A1 DC gain (without Auto-Zero) A1 PSRR (vCCA, VCCD) A1 CMRR A2 input bias voltage (+/- inputs) High-level TTL output voltage Low-level TTL output voltage High-level TTL output current Low-level TTL output current Short-circuit TTL output current Threshold bias voltage RPKDET RHYST bias voltage High-level jam input voltage Low-level jam input voltage High-level jam input current Low-level jam input current High-level flag output voltage Low-level flag output voltage High-level flag output current Low-level flag output current Short-circuit flag output current LED ON maximum sink current VIJ=2.7V VIJ=0.4V IOH=-80A IOL=3.2mA VOUT=2.4V VOUT=0.4V VOUT=0.0V VLED=3.0V 3.25 -61 8 -485 2.4 -240 3.8 0.33 -18 10 -40 22 -26 80 0.4 -5 IOH=-200A IOL=8mA VOUT=2.4V VOUT=0.4V VOUT=0.0V Pin 3 Open Pin 11 Open Pin 12 Open 2.0 0.8 30 7.0 VCCA=VCCD=4.75 to 5.25V VCM=200mV 3.56 2.4 3.08 3.10 TEST CONDITIONS LIMITS Min Typ 30 10 3.4 3.8 30 60 60 3.7 3.4 0.3 -40 30 -95 0.75 0.72 0.72 0.4 -24.4 3.86 Max 41.2 13.5 3.70 4.50 UNIT mA mA V V dB dB dB V V V mA mA mA V V V V V A A V V mA mA mA mA
1998 Oct 07
4
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
AC ELECTRICAL CHARACTERISTICS
Min and Max limits apply over the operating temperature range at VCCA = VCCD = +5.0V unless otherwise specified. Typical data applies at VCCA = VCCD = +5.0V and TA = 25C. SYMBOL fOP BWA1 VINH VINL RIN1 CIN1 RIN2 CIN2 ROUT1 COUT1 VHYS VTHR tTLH tTHL tRFD tPWD PARAMETER Maximum operating frequency Small signal bandwidth (differential OUT1/IN1) Maximum Functional A1 input signal (single ended) Minimum Functional A1 input signal (single ended) Input resistance (differential at IN1) Input capacitance (differential at IN1) Input resistance (differential at IN2) Input capacitance (differential at IN2) Output resistance (differential at OUT1) Output capacitance (differential at OUT1) Hysteresis voltage Threshold voltage range (FLAG ON) TTL Output Rise Time 20% to 80% TTL Output Fall Time 80% to 20% tTLH/tTHL mismatch Pulse width distortion of output 50mVP-P, 1010. . .input Distortion= TH-TL TH+TL 102 2.5 2.5 % Test circuit Test circuit, @ 50MHz RRHYST=5k RTHRESH=47k Test Circuit Test Circuit TEST CONDITIONS Test circuit Test circuit Test Circuit Test CIrcuit1 LIMITS Min 60 Typ 75 75 1.6 12 1200 2 1200 2 25 2 3 12 1.3 1.2 0.1 Max UNIT MHz MHz VP-P mVP-P pF pF pF mVP-P mVP-P ns ns ns
NOTES: 1. The SA5214 is capable of detecting a much lower input level. Operation under 12mVP-P cannot be guaranteed by present day automatic testers.
1998 Oct 07
5
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
VCC +5V 125 47k 0.1F 1 2 3 4 5 6 7 8 9 10
NE5214 0.1F 20 LED IN1B 19 CPKDET IN1A 18 THRESH CAZP 17 GNDA CAZN 16 FLAG OUT1B 15 JAM IN2B 14 VCCD OUT1A 13 VCCA IN2A 12 GNDD RHYST 11 VOUT RPKDET VIN 0.1F 0.1F 25 50
100H 100H 0.1F
5k
10k 10F
400
VOUT
15pF
SD00351
Figure 3. AC Test Circuit
TYPICAL PERFORMANCE CHARACTERISTICS
Analog Supply Current vs Temperature
36 12.0
Digital Supply Current vs Temperature
ANALOG SUPPLY CURRENT (mA)
VCC = 5.25V
32 VCC = 5.00V 30
DIGITAL SUPPLY CURRENT (mA)
34
11.5
11.0 VCC = 5.25V 10.5
28
VCC = 4.75V
10.0
VCC = 5.00V
26
9.5 VCC = 4.75V
24 -60
-40
-20
0
20
40
60
80
100
120
9.0 -60
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (C) 22 21 THRESHOLD (mVp-p) 20 19 18 17 16 15 14 13 12 20 30 RTHRESH (k) 40 50 0 3 RHYST = 5k HYSTERSIS (mVp-p) 3
TEMPERATURE (C)
Threshold Voltage vs RTHRESH
4
Hysteresis Voltage vs RHYST
RTHRESH = 47
2
1
4
5 RHYST (k)
6
7
SD00352
Figure 4. Typical Performance Characteristics
1998 Oct 07
6
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
+VCC 47F C1 C2 .01F
GND
L1 10H R2 220 D1 LED 1 C9 2 100pF 3 4 R3 47k L2 10H 5 6 7 8 9 L3 10H C12 10F C13 .01F 10 CPKDET THRESH GNDA FLAG JAM VCCD VCCA GNDD TTLOUT IN1A 19 C8 10 0.1F 11 12 13 14 LED IN1B 20 100pF 9 GND C7 8 GND VCC VCC 7 6 5 4 3 2 1 BPF31 OPTICAL INPUT C4 .01F 10F R1 100 C5 1.0F
C3
.01F
NE5211
CAZP 18 CAZN 17
GND GND OUT GND OUT
NC IIN NC GND GND
C6
NE5214
OUT1B 16 IN2B OUT1A IN2A RHYST 15 14 13 12
C10 10F
C11 .01F
RPKDET 11
R4 5.1k VOUT (TTL)
NOTE: The NE5211/NE5214 combination can operate at data rates in excess of 100Mb/s NRZ.
SD00353
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
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
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
All die are 100% functional with various parametrics tested at the wafer level, at room temperature only (25C), 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
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.
LED
IN1B
CPKDET
IN1A
THRESH 2 1 20 19
CAZP
GNDA
3
18
CAZN
4
17
FLAG 5
6 JAM
7
VCCD
8
9 VCCA
10
GNDD VOUT ECN No.: 94620 1988 Sep 28 RPKDET
Figure 6. SA5214 Bonding Diagram
1998 Oct 07
CCCCCC CCCCCC CCCCCC CCCCCC CCCCCC CCCCCC CCCCCC
11 12 RHYST
OUT1B 16
15 IN2B
14
13
OUT1A
IN2A
SD00490
8
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
1998 Oct 07
9
Philips Semiconductors
Product specification
Postamplifier with link status indicator
SA5214
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] 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.
Production
[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 (c) 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
Philips Semiconductors
1998 Oct 07 10

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