Texas Instruments LM9704SL

Overview

LM9704SL from National Semiconductor is a real-time digital image processor IC integrating a 16-bit CR16C RISC microprocessor, hardware JPEG encoder, Bayer-to-RGB interpolation engine, defective pixel correction, and USB 1.1 interface - all in a single 128-pin laminated CSP package. It supports SXGA/VGA/CIF array formats, processes raw Bayer data at up to 15 MHz pixel clock, and delivers full-resolution video or high-quality stills for embedded camera systems.

For engineers reviewing the LM9704SL datasheet, LM9704SL pinout, LM9704SL application, or LM9704SL equivalent, key selection considerations include its dedicated JPEG compression pipeline, 32 KB on-chip RAM, ACCESS.bus sensor control interface, 6-channel DMA, and dual-voltage operation (2.25–2.75 V core / 2.7–3.6 V I/O) for low-power portable imaging designs.

Technical Context

The LM9704SL implements a tightly coupled image processing architecture with separate pre-processing (defective pixel correction, digital gain, raw statistics), color processing (Bayer interpolation, programmable gamma/color correction, sharpening), and hardware JPEG encoding blocks - all synchronized via an AMBA peripheral bus and controlled by the embedded CR16C CPU. Its memory subsystem supports up to 16 MB external SRAM/Flash/CompactFlash at ≤36 MHz with glueless CMOS sensor interface and frame-skipping capability.

System-level timing is derived from a 12 MHz crystal with internal PLL generating up to 60 MHz core clock; power management includes POR, wake-up module (16 inputs), and configurable sleep modes. USB 1.1 (960 KB/s) and USART (921.6 kbps) provide host connectivity, while JTAG enables on-chip debug.

Key Specifications

Pinout & Package

LM9704SL is housed in a 128-pin laminated chip-scale package (CSP) with 0.5 mm pitch, designed for high-density camera module PCB layouts. The package supports fine-pitch routing and thermal dissipation via exposed die pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital image processor applications.

Compared with OV9650 and TMS320DM642, the LM9704SL uniquely combines dedicated JPEG hardware, on-chip 32 KB RAM, and integrated USB 1.1 in a single low-power (95 mW) package - making it optimal for cost-sensitive, volume-consumer imaging systems requiring minimal external components.

Availability

LM9704SL is available at Aetrix Electronics and suitable for PC cameras, dual-mode handheld imagers, and industrial machine vision systems requiring stable component supply and long-term manufacturability assurance.

Supply support for LM9704SL 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

National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011. Known for high-performance data converters, power management, and interface solutions.

The LM9704SL belongs to National's digital imaging processor product line, designed specifically to integrate sensor interface, real-time image enhancement, and USB-ready JPEG compression into a single chip for portable and embedded camera applications.

FAQ

What is the primary function of the LM9704SL in a digital camera system?

The LM9704SL serves as a complete real-time digital image processor SoC. It receives raw Bayer data from a CMOS sensor, performs defective pixel correction, color interpolation, gamma/color adjustment, sharpening, and hardware JPEG compression - then outputs compressed images or video via USB 1.1 or USART. The LM9704SL integrates a CR16C CPU, 32 KB RAM, and system management functions, eliminating the need for external processors in many camera designs.

Does the LM9704SL support SXGA resolution, and what is the maximum pixel clock rate?

Yes, the LM9704SL supports SXGA (1280×1024), VGA (640×480), and CIF (352×288) array formats. Its video input interface accepts raw image data at up to 15 MHz pixel clock - sufficient for real-time SXGA capture at reduced frame rates or full-rate VGA video. This specification is confirmed in the official National Semiconductor datasheet for the LM9704SL.

What type of USB interface does the LM9704SL implement, and what data throughput does it achieve?

The LM9704SL implements a full-speed USB 1.1 interface compliant with the USB specification, achieving up to 960 KB/s (≈7.68 Mbps) sustained throughput. This enables direct connection to PCs for video streaming or still image transfer without requiring an external USB transceiver. The LM9704SL handles USB enumeration, descriptor handling, and packet buffering internally.

Can the LM9704SL operate with a single power supply, or does it require separate core and I/O rails?

The LM9704SL requires two independent power supplies: VDD_CORE (2.25–2.75 V) for the CPU, JPEG engine, and internal logic; and VDD_IO (2.7–3.6 V) for USB, USART, GPIO, and sensor interface circuits. This dual-rail design ensures signal integrity and noise isolation - the LM9704SL will not function correctly if only one supply is applied or if voltages fall outside these ranges.

Is the LM9704SL pin-compatible with other members of the LM97xx family, such as the LM9702?

No, the LM9704SL is not pin-compatible with the LM9702 or other LM97xx variants. While functionally related, the LM9704SL uses a 128-pin laminated CSP package with unique pin assignments for its USB interface, ACCESS.bus, and sensor data bus. Pin compatibility is not claimed in National Semiconductor documentation, and PCB layout must be designed specifically for the LM9704SL footprint.