Texas Instruments LM98714CCMT

Overview

LM98714CCMT from Texas Instruments is a three-channel, 16-bit, 45 MSPS analog front end (AFE) with integrated CCD/CIS sensor timing generator, LVDS/CMOS output interface, and independent CDS/S/H processing per channel - designed for high-fidelity color image capture in flatbed scanners and MFPs. It supports 0.7–7.84× programmable gain, ±9-bit analog offset correction, and digital black level loops per channel.

For engineers reviewing the LM98714CCMT datasheet, LM98714CCMT pinout, LM98714CCMT application, or LM98714CCMT equivalent, this device serves as a complete AFE solution requiring precise pixel-rate synchronization, multi-channel DC offset calibration, and low-noise 16-bit digitization at up to 45 MSPS with configurable LVDS or CMOS output formatting.

Technical Context

The LM98714CCMT implements a fully differential signal path with Correlated Double Sampling (CDS) for CCD sensors or Sample-and-Hold (S/H) for CIS/CMOS sensors, each with independent 8-bit PGA gain control (256 steps) and ±9-bit analog DAC offset correction. Its internal timing generator produces up to ten configurable digital outputs (CLK1–CLK10, SH) for sensor clocking and transfer control.

It operates in three selectable AFE modes: Mode 3 (3-channel synchronous sampling at 15 MSPS/channel), Mode 2 (2-channel at 22.5 MSPS/channel), and Mode 1 (1-channel sequential line sampling at 30 MSPS), all synchronized to a single 45 MSPS ADC core with LVDS or CMOS parallel output formatting.

Key Specifications

Pinout & Package

LM98714CCMT is housed in a 48-pin TSSOP package (12.50 mm × 6.1 mm body size), optimized for high-density scanner controller boards with thermal and signal integrity constraints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog front end applications.

Compared with LM98722CIMT and TDA0361A, the LM98714CCMT uniquely integrates full timing generation, 16-bit precision, and dual-output interface flexibility - making it the only option supporting high-end RGB flatbed scanners without external clock ICs or resolution compromise.

Availability

LM98714CCMT is available at Aetrix Electronics and suitable for flatbed color scanners, multi-function peripherals, and high-speed document scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LM98714CCMT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in precision signal chain solutions.

The LM98714CCMT belongs to TI's Image Signal Processing AFE product line, engineered specifically for high-fidelity digitization in office imaging equipment - balancing speed, accuracy, and integration to eliminate discrete timing and signal conditioning components.

FAQ

What is the maximum pixel rate supported by the LM98714CCMT in three-channel mode?

The LM98714CCMT supports a maximum channel sampling rate of 15 MSPS in Mode 3 (three-channel synchronous operation), with the internal ADC running at 45 MSPS to digitize all three inputs (OSR, OSG, OSB) sequentially. This enables full RGB line capture at resolutions exceeding 600 DPI in flatbed scanners without pixel interpolation or frame buffering delays. The LM98714CCMT achieves this using a shared 45 MSPS ADC core with time-multiplexed input routing and independent per-channel gain/offset correction.

Does the LM98714CCMT support both CCD and CIS sensors?

Yes, the LM98714CCMT supports both CCD and CIS sensors through its selectable input architecture: Correlated Double Sampling (CDS) mode is optimized for CCD arrays to suppress reset noise, while Sample-and-Hold (S/H) mode accommodates Contact Image Sensors and CMOS sensors with single-ended or differential outputs. Each of the three analog inputs (OSR, OSG, OSB) can be independently configured for CDS or S/H operation, and the LM98714CCMT includes programmable clamp voltage (VCLP) and bias networks to match sensor-specific DC operating points.

How does the digital black level correction loop function in the LM98714CCMT?

The LM98714CCMT implements an independent digital black level correction loop for each of its three input channels. During optical black calibration periods (e.g., before or after active scanning), the device measures dark pixel values, computes required offset adjustments, and automatically updates the corresponding 10-bit digital offset DAC register. This closed-loop correction occurs without host processor intervention and maintains sub-1 LSB stability across temperature - eliminating manual calibration routines and ensuring consistent grayscale fidelity in the LM98714CCMT-based scanner firmware.

Can the LM98714CCMT generate timing signals for external motor controllers?

Yes, the LM98714CCMT provides ten configurable digital timing outputs (SH, CLK1–CLK10), each programmable as push-pull, open-drain, or with internal pull-up/pull-down resistors. These outputs can drive stepper motor phase controllers, paper feed solenoids, or CIS illumination timing circuits directly - eliminating the need for external timing logic or microcontroller GPIO expansion. In the LM98714CCMT, timing parameters such as pulse width, delay, and polarity are register-controlled and synchronized to the internal pixel clock, ensuring deterministic mechanical-electrical coordination in MFP systems.

What are the power supply requirements for the LM98714CCMT?

The LM98714CCMT requires four separate supply domains: VA (3.3 V analog, 60–125 mA), VD (3.3 V digital output driver, 12–40 mA), VR (3.3 V internal reference, 30–75 mA), and VC (3.3 V timing generator drivers, 0.5–12 mA). Each supply must be bypassed per the datasheet: VA with 4.7 µF + 0.1 µF to AGND; VD/VR/VC with 0.1 µF to DGND; and VC also shares a common 4.7 µF bulk capacitor with VD and VR. Total typical power dissipation is 505 mW (LVDS) or 610 mW (CMOS) at full operation - verified across 0°C to 70°C ambient.