SY88903KC - 1.25Gbps Limiting Post Amplifier | Microchip
MPN: SY88903KC ✓ सक्रियSY88903KC अवलोकन
A limiting post amplifier is a special-purpose amplifier that provides high gain and wide bandwidth near the output of an optical receiver. Unlike a linear amplifier, it restores a consistent digital output amplitude after the photodiode, transimpedance amplifier, and clock-recovery stages have introduced attenuation and noise. The SY88903KC is intended to work with the related SY88902 and SY88904 receiver functions.
Principal features include operation to 1.25 Gbps, differential PECL data inputs, a TTL enable input, low-noise amplification, and chatter-free loss-of-signal generation. The open-collector TTL LOS output allows the receiver system to detect an absence of incoming optical signal without mistaking brief signal interruptions for a hard failure. Because the output is open collector, an external pull-up resistor is required when the LOS function is used.
The SY88903KC uses PECL-compatible signaling at its data inputs and outputs, a common high-speed logic standard in optical transport systems where short signal excursions are easier to maintain than CMOS swings. Its limiting behavior supplies a consistent output level for controllers, serializers, and clock-and-data-recovery circuits. The single-supply architecture simplifies the design of line cards and optical transceiver modules, although the input and output biasing networks must follow the manufacturer's reference circuit.
Typical uses include 1.25 Gbps SONET and related fiber-optic links, optical network transceivers, PON equipment, and clock-recovery subsystems. The IC is particularly appropriate where a weak received signal must be restored without adding excessive pattern-dependent jitter or requiring a separate linear gain stage.
In implementation, preserve the high-speed differential trace geometry, keep PECL input and output connections short, and place the LOS pull-up resistor close to the open-collector pin. Confirm the receiver's data rate, common-mode voltage, termination scheme, and power sequencing against the manufacturer datasheet before releasing a production layout.
This page consolidates verified manufacturer and distributor information, interface characteristics, application guidance, and practical implementation notes for engineers evaluating the SY88903KC in 1.25 Gbps optical receiver designs.
के लिए ड्रॉप-इन विकल्प SY88903KC — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
इस उत्पाद के लिए कोई drop-in alternatives उपलब्ध नहीं।
विकल्प अनुरोध करेंSY88903KC Maximum Ratings और Electrical Characteristics
| Product Type | High-speed limiting post amplifier |
| Maximum Data Rate | 1.25 Gbps |
| Input Signal Type | Differential PECL |
| Minimum Input Signal | 5 mVp-p |
| Output Signal Type | PECL-compatible differential output |
| सप्लाई वोल्टेज | 3.3 V single supply |
| Enable Input | TTL |
| Loss-of-Signal Output | Open-collector TTL |
| Loss-of-Signal Behavior | Chatter-free |
| पैकेज | 10-pin MSOP |
| माउंटिंग प्रकार | Surface mount |
| Amplifier Function | Limiting amplifier |
| Designed Companion Devices | SY88902 and SY88904 |
SY88903KC 10-pin msop पिन कॉन्फ़िगरेशन गाइड
SY88903KC (10-pin msop पैकेज) के लिए पिन कॉन्फ़िगरेशन। इस एनालॉग कंपोनेंट में इनपुट, आउटपुट और पावर सप्लाई पिन हैं। ऑफ़सेट नल, कम्पनसेशन और एनेबल पिन कॉन्फ़िगरेशन के लिए निर्माता डेटाशीट देखें। सिग्नल कंडीशनिंग और एम्प्लीफ़ायर सर्किट के लिए आदर्श।
इसके लिए कोई विस्तृत pinout data उपलब्ध नहीं: SY88903KC.
देखें डेटाशीट पूर्ण पिन कॉन्फ़िगरेशन के लिए।
सामान्य अनुप्रयोग
SY88903KC के लिए उपयुक्त है 6 अनुप्रयोगs: 1.25 Gbps Fiber-Optic Receiver Post Amplification, SONET Optical Network Interface, Optical Transceiver Module Data Path, Passive Optical Network Burst-Mode Receiver, Clock-and-Data-Recovery Pre-Amplifier, Loss-of-Signal Monitoring and Fault Management.
1.25 Gbps Fiber-Optic Receiver Post Amplification
The SY88903KC fits immediately after the analog front end of a 1.25 Gbps optical receiver because it accepts differential PECL signals as small as 5 mVp-p and restores them to a stable limiting level. According to the Microchip manufacturer datasheet, the combination of high gain and wide bandwidth is intended for optical data rates up to 1.25 Gbps. Placing the device after the transimpedance and clock-recovery stages reduces the required gain of upstream analog blocks. The tradeoff is the added power and component count of a separate limiting stage, while its dedicated design simplifies PECL biasing compared with a generic amplifier.
अनुशंसित
SONET Optical Network Interface
The SY88903KC is appropriate for 1.25 Gbps optical network links where received data must be presented as a consistent PECL-compatible signal before clock-and-data-recovery or deserializer circuitry. Its rated 1.25 Gbps operation, differential PECL inputs, and limiting output behavior align with the design of optical line cards and transceivers. The part also supports system monitoring through a chatter-free open-collector TTL loss-of-signal output. Engineers should verify jitter, skew, and common-mode margins in the complete receiver chain because the post amplifier cannot correct upstream noise or timing errors generated before it.
अनुशंसित
Optical Transceiver Module Data Path
Within a 3.3 V optical transceiver module, the SY88903KC provides the final limiting stage before data is handed to transmit, retiming, or framing logic. Its single 3.3 V supply matches modern compact module architectures, while its differential PECL interface avoids slow single-ended CMOS transitions at 1.25 Gbps. The TTL enable input can be connected to receiver-control logic when shutdown behavior is required. The open-collector LOS output also allows the host to identify loss of optical input, although a pull-up and appropriate fault-handling strategy must be included in the module design.
अनुशंसित
Passive Optical Network Burst-Mode Receiver
The SY88903KC can be considered for optical network receivers where incoming data amplitude varies with optical power and a fixed output level is required downstream. Its limiting action is suited to restoring signals as small as 5 mVp-p, and the differential PECL interface supports a compact high-speed implementation. The chatter-free LOS output is valuable for monitoring burst inactivity or upstream transmitter failures. Designers must still verify settling behavior and burst-mode requirements in the complete analog and clock-recovery chain, because the verified data establishes the 1.25 Gbps speed limit but does not provide a dedicated PON burst specification.
अनुशंसित
Clock-and-Data-Recovery Pre-Amplifier
The SY88903KC can precede clock-and-data-recovery circuitry when the recovered optical signal requires amplitude restoration and limiting. A stable output from the post amplifier simplifies the input threshold assumptions of the subsequent digital devices, while its 1.25 Gbps bandwidth matches the target link rate. Because this is a limiting rather than linear amplifier, it is better suited to restoring a known digital waveform than to conditioning an analog waveform whose amplitude information must be preserved. Board-level validation should include eye closure, deterministic jitter, and the interface behavior observed during LOS transitions.
अनुशंसित
Loss-of-Signal Monitoring and Fault Management
The SY88903KC supports link supervision by generating a chatter-free loss-of-signal indication on an open-collector TTL output. This function is useful in optical receivers where the host must distinguish an absent optical signal from normal data activity without reacting to brief interruptions. Because the output is open collector, the board designer must add a pull-up resistor and define how the fault signal interacts with system-level shutdown or alarm logic. The Microchip manufacturer datasheet identifies chatter-free LOS generation as a principal feature, making it more purpose-built for receiver monitoring than a general-purpose limiting amplifier.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा SY88903KC — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
The supplied cross-reference search did not identify a verified competing drop-in part, so cross-brand qualification is not currently supportable from the available evidence. The SY88903 base-family designation is the closest related item identified, while SY88902 and SY88904 are companion functions rather than direct replacements. Before approving any substitute, compare the package drawing, complete pin table, PECL common-mode levels, enable polarity, LOS timing, output current, and AC specifications. For production procurement, obtain dated pricing and lead-time quotations because numeric unit pricing was not present in the verified data as of 2026-10-28.
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद |
|---|---|
| Product Type | 1.25 Gbps limiting post amplifier |
| Brand | Microchip Technology |
| Package | 10-pin MSOP |
| Maximum Data Rate | 1.25 Gbps |
| Input Interface | Differential PECL |
| Minimum Input Signal | 5 mVp-p |
| Supply Voltage | 3.3 V single supply |
| Enable Interface | TTL |
| Loss-of-Signal Output | Chatter-free open-collector TTL |
| Intended Companion Devices | SY88902 and SY88904 |
मुख्य विशेषताएँ
- Receiver-specific limiting and loss detection in one device (बनामGeneric high-speed limiting amplifier)
- Designed for use with a defined optical receiver ecosystem (बनामStandalone amplifier-based receiver design)
- Low-level optical signal restoration (बनामReceiver requiring a higher-level input)
डिज़ाइन नोट्स
Treat the SY88903KC data path as a controlled-impedance differential transmission line rather than a conventional slow digital route. The Microchip manufacturer datasheet specifies differential PECL inputs and operation to 1.25 Gbps, so trace length mismatch, connector transitions, and stub effects can reduce timing margin. Follow the reference layout and termination arrangement, keep the amplifier close to the preceding receiver stage, and avoid routing the PECL signals through test pads or long unprotected branches.
Place the external pull-up resistor for the open-collector TTL loss-of-signal output close to the SY88903KC LOS pin, and route the fault trace away from the 1.25 Gbps differential pairs. The LOS signal is slow compared with the data path, but its transition edges can still couple into nearby high-energy nets. Keep the 3.3 V supply and ground connections short, use a solid ground reference, and follow the manufacturer's recommended decoupling arrangement without inserting long series impedance between the device and its local bypass capacitor.
Do not substitute SY88903KC with a generic limiting amplifier solely on bandwidth or gain. The device's functional specification includes a 5 mVp-p minimum input signal, differential PECL interface, TTL enable input, chatter-free open-collector TTL LOS output, and a stated 1.25 Gbps operating limit. A replacement must match the exact pin assignments, bias network, output levels, enable polarity, LOS timing, and package footprint. The verified data did not establish a cross-brand drop-in equivalent, so any substitute requires schematic, layout, and signal-integrity verification.
अनुपालन जानकारी
The supplied verified results identify the Microchip manufacturer datasheet and distributor availability but do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not_applicable because this is a communication amplifier rather than an automotive-qualified device; no automotive qualification claim was verified.
