Transmitter (TX) Driver

Product Specifications

Technical details and manufacturing context for Transmitter (TX) Driver

Definition

A Transmitter (TX) Driver is a critical component within a SerDes (Serializer/Deserializer) system. Its primary function is to receive parallel digital data from the serializer, convert it into a high-speed serial data stream, and then amplify and condition this stream to meet the specific voltage, current, and timing requirements necessary for reliable transmission over a physical medium (e.g., PCB trace, cable, or backplane). It ensures signal integrity by providing proper output swing, impedance matching, and pre-emphasis or equalization to compensate for channel losses. The TX Driver operates by receiving a low-voltage differential signal (LVDS) or similar digital input from the preceding serializer stage. It uses current-steering or voltage-mode output stages to amplify this signal to the required transmission standard amplitude (e.g., CML, LVDS, PECL). It often incorporates programmable features like output swing control and pre-emphasis, which boosts high-frequency components of the signal to counteract attenuation and inter-symbol interference (ISI) during propagation through the transmission channel. Typical parameters include supply voltage 1.8–3.3 V, data rate 1–32 Gbps per lane (NRZ or PAM4), programmable output swing 0.4–1.2 Vppd, rise/fall time 15–40 ps (20%–80% at max data rate), deterministic jitter ≤5 ps at nominal supply and 25°C, operating temperature -40–85°C (industrial grade), ESD robustness ±2 kV HBM (IEC 61000-4-2), package QFN-32 (5×5 mm, 0.5 mm pitch), power consumption 0.5–2.5 W depending on data rate and output swing, and differential output impedance 100 Ω ±10% matching to a 100 Ω transmission line. Materials on file include silicon (semiconductor), copper (interconnects), and encapsulation epoxy. These values are directory reference ranges and must be confirmed for the specific model and application with the legal manufacturer or supplier.

Working Principle

The TX Driver receives a low-voltage differential signal (LVDS) or similar digital input from the preceding serializer stage. It uses current-steering or voltage-mode output stages to amplify this signal to the required transmission standard amplitude (e.g., CML, LVDS, PECL). It often incorporates programmable features like output swing control and pre-emphasis, which boosts high-frequency components of the signal to counteract attenuation and inter-symbol interference (ISI) during propagation through the transmission channel.

Common Materials

Silicon (Semiconductor), Copper (Interconnects), Encapsulation Epoxy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	1.8–3.3 V	Operating range for core logic and I/O
Data Rate	1–32 Gbps	Per lane, NRZ or PAM4
Output Swing	0.4–1.2 Vppd	Differential peak-to-peak, programmable
Rise/Fall Time	15–40 ps	20%–80%, at max data rate
Deterministic Jitter	≤5 ps	At nominal supply and 25°C
Operating Temperature	-40–85 °C	Industrial grade
ESD Robustness	±2 kV	HBM, all pinsIEC 61000-4-2
Package Type	QFN-32	5×5 mm, 0.5 mm pitch
Power Consumption	0.5–2.5 W	Depends on data rate and output swing
Differential Output Impedance	100 ±10% Ω	Matching to 100 Ω transmission line

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Output Buffer/Stage
Final amplification stage that drives the signal onto the transmission line with the correct voltage swing and impedance.

Material: Semiconductor (CMOS, BiCMOS)
Pre-emphasis/Equalization Circuit Part
Applies frequency-dependent gain to boost high-frequency signal components, counteracting channel attenuation.

Material: Semiconductor
Impedance Matching Network
Ensures the driver's output impedance matches the characteristic impedance of the transmission line to minimize reflections.

Material: On-chip resistors/transistors
Bias Circuitry Part
Provides stable reference currents and voltages for the amplifier stages.

Material: Semiconductor

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Transmitter (TX) Driver.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

SerDes (Serializer/Deserializer)

View system integration details

Manufacturers of Transmitter (TX) Driver

Manufacturer profiles associated with Transmitter (TX) Driver.

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Frequently Asked Questions

What is the primary function of a TX Driver?

The TX Driver receives parallel digital data from a serializer, converts it into a high-speed serial stream, and amplifies/conditions it to meet voltage, current, and timing requirements for reliable transmission over a physical medium like a PCB trace or cable.

What are typical output standards supported?

Typical output standards include CML, LVDS, and PECL, with programmable output swing from 0.4 to 1.2 Vppd. The specific standard and swing must be confirmed for the actual model.

How does pre-emphasis help signal integrity?

Pre-emphasis boosts high-frequency components of the signal to counteract attenuation and inter-symbol interference (ISI) that occur during transmission, improving the received signal quality.

What parameters should be verified before selection?

Key parameters include supply voltage (1.8–3.3 V), data rate (1–32 Gbps), output swing, rise/fall time, jitter, operating temperature, ESD robustness, package type, power consumption, and output impedance. Always confirm with the manufacturer for the specific model.

Data Basis

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Preliminary Technical Classification

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voltage:	1.8V to 3.3V
data rate:	Up to 28 Gbps
temperature:	-40°C to +85°C
power dissipation:	Max 150 mW

Product Specifications

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