Analog Devices Inc./Maxim Integrated MAX1101CWG

Overview

MAX1101CWG from Maxim Integrated is a single-chip 8-bit CCD digitizer with integrated clamp circuitry, 6-bit programmable-gain amplifier (PGA), and three-input multiplexer. It digitizes linear CCD outputs at up to 1 MHz, supports correlated double sampling (CDS) or black-level correction, and interfaces via a serial bidirectional DATA line controlled by MODE, SCLK, LOAD, and VIDSAMP. It targets monochrome imaging systems requiring pixel-accurate analog signal conditioning before ADC conversion.

For engineers reviewing the MAX1101CWG datasheet, MAX1101CWG pinout, MAX1101CWG application, or MAX1101CWG equivalent, this page delivers verified functional identity, validated 24-pin SO package mapping, confirmed timing and gain parameters, real-world CCD interface constraints, and two technically documented alternative parts for scanner, fax, and digital copier designs.

Technical Context

The MAX1101CWG implements a switched-capacitor PGA with 64-step gain control from –2 V/V to –10 V/V in –0.125 V/V increments, using CI/CF capacitor ratio modulation. Its clamp circuit samples black level on CLAMP high, charging CEXT to VREF+, enabling either per-pixel CDS or per-line black-level compensation depending on CLAMP timing and CEXT value (4 nF for CDS, ≥12 nF for black-level mode).

The ADC employs a recycling half-flash architecture: a 4-bit flash section generates MSBs, then an internal DAC produces a residue voltage for a second 4-bit flash comparison to yield full 8-bit output. Data latency is precisely two VIDSAMP cycles, with output synchronized to the falling edge of VIDSAMP and clocked out on SCLK rising edges.

Key Specifications

Pinout & Package

Packaged in a 24-pin wide SOIC (SOICW), the MAX1101CWG features exposed ground pins for low-inductance return paths and internally connected (I.C.) pins that must remain unconnected. Bypassing requires local 0.1 µF ceramic capacitors on each VDD pin to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCD digitizer applications.

Compared with MAX1100CWG, the MAX1101CWG trades industrial temperature rating for lower cost and qualification scope, while compared with TLC5510IPWR, it delivers complete analog signal chain integration at the expense of resolution and interface flexibility-making it the most efficient solution for cost-sensitive, space-constrained monochrome imaging.

Availability

MAX1101CWG is available at Aetrix Electronics and suitable for document scanners, fax machines, and digital copiers requiring stable component supply, commercial-temperature performance, and integrated CCD signal conditioning.

Supply support for MAX1101CWG 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

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for precision sensing, power management, and data conversion.

The MAX1101CWG belongs to Maxim's CCD signal processor product line, designed specifically to replace multi-chip analog front-ends in monochrome imaging systems with a single, timing-optimized digitizer IC.

FAQ

What is the operating temperature range for the MAX1101CWG?

The MAX1101CWG is specified for the commercial temperature range of 0°C to +70°C. This rating is explicitly stated in the Ordering Information section and confirmed in the Absolute Maximum Ratings table. Operation outside this range may result in parametric degradation or functional failure. For extended-temperature applications, consider the pin-compatible MAX1100CWG variant rated from –40°C to +85°C.

How does the MAX1101CWG implement correlated double sampling (CDS)?

The MAX1101CWG implements CDS by using the CLAMP and VIDSAMP signals in sequence: CLAMP high charges CEXT to VREF+, capturing the CCD reset level; then VIDSAMP falling edge samples the video level relative to that reference. The internal switched-capacitor PGA cancels offset voltage stored during VIDSAMP low phase, subtracting reset noise from the final digitized value. This occurs per-pixel when CLAMP is asserted once per pixel.

What is the recommended value of CEXT for CDS operation in the MAX1101CWG?

For CDS operation, the MAX1101CWG datasheet specifies CEXT = 4 nF as the optimal value. This balances CLAMP switch resistance (≤150 Ω) and charge injection error (~3 mV), ensuring ≥70% cancellation of inter-pixel reset-level variation at 670 kHz sample rates. Using values significantly smaller increases offset error; larger values degrade CDS timing response due to RC time constant limitations.

Can the MAX1101CWG accept auxiliary analog inputs, and how are they selected?

Yes, the MAX1101CWG supports two auxiliary analog inputs-AIN1 (Pin 4) and AIN2 (Pin 6)-selected via its internal three-input multiplexer. Selection is programmed using the first two bits (A0, A1) of the 8-bit control byte sent during MODE = 0 operation, as defined in Table 1 of the datasheet. These inputs bypass the clamp and PGA, connecting directly to the ADC input stage referenced to VREF– and VREF+.

What is the function of the MODE pin on the MAX1101CWG?

The MODE pin on the MAX1101CWG controls data direction on the bidirectional DATA pin: when MODE = 0, DATA serves as an input for programming the PGA gain or mux channel; when MODE = 1, DATA becomes an output delivering 8-bit ADC conversion results. This dual-mode interface reduces pin count and simplifies host controller integration, eliminating the need for separate data-in and data-out lines.