Analog Devices Inc. AD7853LANZ

Overview

AD7853LANZ from Analog Devices is a 12-bit, 100 kSPS pseudo-differential successive-approximation ADC optimized for low-power operation on single 3 V to 5.5 V supply. It features on-chip 2.5 V reference, system/self-calibration, 24-pin SOIC package, and SPI/8051-compatible serial interface - deployed in battery-powered medical instruments and portable data acquisition systems.

For engineers reviewing the AD7853LANZ datasheet, AD7853LANZ pinout, AD7853LANZ application, or AD7853LANZ equivalent, key selection criteria include its 100 kSPS throughput, ±1 LSB INL (B-grade), 4.5 mW typical power at 3 V, and support for unipolar/bipolar input ranges with external or internal reference flexibility.

Technical Context

The AD7853LANZ implements a SAR architecture with integrated track-and-hold acquiring signals in ≤0.4 µs, calibrated DAC-based comparator, and flexible serial interface supporting five modes via SM1/SM2 pins. Its calibration engine supports full self-calibration (typ. 27.78 ms at 1.8 MHz CLKIN), system offset/gain adjustment, and retains calibration data during sleep mode.

It operates with analog input ranges of 0 to VREF (unipolar) or ±VREF/2 (bipolar), accepts reference voltages from 1.2 V to AVDD, and uses dual ground domains (AGND/DGND) with separate analog/digital supplies (AVDD/DVDD) - enabling noise-sensitive mixed-signal designs without external isolation components.

Key Specifications

Pinout & Package

AD7853LANZ is housed in a 24-lead SOIC (R-24) package with standard 0.3-inch width, gull-wing leads, and JEDEC MS-013AC footprint. Pin 1 is marked by notch or dot; AGND appears at Pins 6 and 12 for low-impedance analog return path separation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD7853LANZ, AD7853LBNZ offers improved linearity at identical power and footprint, while ADS7822U trades integrated reference and calibration for smaller size and higher speed - making AD7853LANZ optimal for self-contained, low-maintenance portable measurement systems.

Availability

AD7853LANZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial data loggers, and portable test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for AD7853LANZ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7853L series was designed specifically for ultra-low-power, high-accuracy data acquisition in portable and remote sensing applications - emphasizing integrated calibration, flexible reference options, and robust serial interfacing.

FAQ

What is the maximum sampling rate supported by the AD7853LANZ?

The AD7853LANZ supports a maximum throughput rate of 100 kSPS, achieved with a 1.8 MHz master clock (CLKIN). This is fixed for the L-version and reflects its low-power optimization - distinct from the 200 kSPS capability of the standard AD7853. Conversion time is guaranteed at ≤10 µs (18 × tCLKIN), and the track-and-hold acquires signals in ≤0.4 µs, ensuring accurate capture of dynamic inputs within its rated bandwidth.

Does the AD7853LANZ require external calibration components?

No, the AD7853LANZ does not require external calibration components for basic operation. It includes on-chip self-calibration and system-calibration logic, and powers up ready for read-only use. A 0.1 µF multilayer ceramic capacitor (CREF1) and 0.01 µF ceramic disc capacitor (CREF2) are required on CREF1 and CREF2 pins to stabilize the internal reference - but no trimming resistors, external DACs, or calibration firmware are needed. The CAL pin supports optional auto-calibration on power-up using a 10 nF capacitor to DGND.

Can the AD7853LANZ operate with a 2.5 V external reference?

Yes, the AD7853LANZ can operate with a 2.5 V external reference applied to the REFIN/REFOUT pin. When an external reference is used, the internal 2.5 V reference is disabled, and the device accepts reference voltages from 1.2 V to AVDD. The datasheet specifies DC accuracy (e.g., ±1 LSB INL, ±1 LSB DNL) with both 2.5 V and 5 V external references at VDD = 3 V or 5 V. Using an external reference improves long-term stability and temperature drift beyond the on-chip reference's 20 ppm/°C spec.

What serial interface protocols does the AD7853LANZ support?

The AD7853LANZ supports five configurable serial interface modes via SM1 and SM2 pins, compatible with SPI, QSPI, and 8051 microcontrollers. These include external-clock input (SCLK as input), self-clocking output (SCLK as output), and frame-sync variants (SYNC as input or output). POLARITY pin selects SCLK idle state (high/low), and the 16-bit data frame supports both read and write operations to on-chip registers - enabling software-controlled calibration, power modes, and conversion start without external logic.

Is the AD7853LANZ pin-compatible with other members of the AD7853 family?

Yes, the AD7853LANZ is pin-compatible with all AD7853/AD7853L variants in the same package type - including AD7853ANZ, AD7853BNZ, AD7853LBNZ, and AD7853ARS. All share identical 24-pin SOIC (R-24) or SSOP (RS-24) footprints, matching pin functions, voltage ratings, and timing interfaces. Differences are limited to grade (A/B), power profile (standard/L), and linearity specification - allowing drop-in replacement in existing layouts when thermal and accuracy requirements align.