Texas Instruments ADS7852YB/250

Overview

ADS7852YB/250 from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with integrated 2.5V reference, 500kHz throughput, ±1 LSB INL, TQFP-32 package, and dual power-saving modes (nap/sleep). It delivers 70dB SINAD and supports 0V–5V input range using internal reference or 4.0V–5.1V with external overdrive - ideal for portable medical instrumentation and high-speed data acquisition systems.

For engineers reviewing the ADS7852YB/250 datasheet, ADS7852YB/250 pinout, ADS7852YB/250 application, or ADS7852YB/250 equivalent, key selection criteria include guaranteed ±1 LSB integral linearity over –40°C to +85°C, 12-bit parallel CMOS interface timing, channel-select address decoding (A0–A2), and low-power operation down to 10µA in sleep mode.

Technical Context

The ADS7852YB/250 implements a capacitive redistribution SAR architecture with on-chip sample-and-hold, enabling single-cycle acquisition at 500kHz. Its internal 2.5V bandgap reference drives a buffered CDAC array, and the VREF pin accepts external references (2.0V–2.55V) via a 10kΩ series resistor.

Digital control uses asynchronous CMOS-level signals: WR initiates conversion with A0–A2 channel selection; BUSY indicates conversion status; RD/CS enable tri-state parallel output (DB0–DB11); nap/sleep modes are entered via rising-edge RD with specific A0/A1 states per Table II.

Key Specifications

Pinout & Package

TQFP-32 (PBS) package with 0.8mm pitch, exposed thermal pad (not electrically connected), JEDEC MO-220 compliant. Requires 0.1µF ceramic + 2.2µF tantalum decoupling on VREF and 0.1µF + 10µF on VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7852Y/250 and ADS8325IPW, the ADS7852YB/250 uniquely balances 12-bit precision (±1 LSB INL), 500kHz parallel throughput, integrated reference, and ultra-low-power nap/sleep modes-making it optimal for portable, multi-channel, battery-aware measurement systems requiring immediate wake-up fidelity.

Availability

ADS7852YB/250 is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, and portable test equipment requiring stable component supply across extended lifecycle planning.

Supply support for ADS7852YB/250 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADS7852YB/250 belongs to TI's precision SAR ADC product line, engineered for high-speed, low-power, multi-channel data acquisition in space-constrained and thermally demanding environments.

FAQ

What is the guaranteed integral linearity error for ADS7852YB/250 over its full operating temperature range?

The ADS7852YB/250 guarantees ±1 LSB integral linearity error from –40°C to +85°C, as specified in the Electrical Characteristics table under "Integral Linearity Error" for the YB grade. This is tighter than the ±2 LSB spec of the ADS7852Y variant and ensures consistent code-to-voltage mapping across industrial temperature extremes without recalibration. The ADS7852YB/250 achieves this via enhanced laser trimming of the internal CDAC array during final test.

How does the nap mode of ADS7852YB/250 differ from sleep mode in terms of wake-up behavior and power consumption?

The nap mode of ADS7852YB/250 draws ~600µA and keeps the internal 2.5V reference powered, allowing immediate valid conversions upon exit-no settling delay. Sleep mode draws ~10µA but powers down the reference, requiring hundreds of milliseconds for stabilization before reliable data. The ADS7852YB/250 enters nap when A0=1 and A1=0 on RD rising edge; sleep when A1=1. Both modes are controlled exclusively by RD if CS remains low.

Can ADS7852YB/250 accept an external reference voltage, and what are the voltage limits and implications?

Yes, ADS7852YB/250 accepts an external reference from 2.0V to 2.55V on the VREF pin, setting the analog input range to 4.0V–5.1V. The internal 2.5V reference is overdriven via a 10kΩ on-chip series resistor, which may draw up to 75µA during transition. External references must drive this impedance and tolerate the bypass capacitance (0.1µF ceramic + 2.2µF tantalum); dynamic loads cause gain error variation, so static or low-bandwidth references are preferred.

What is the timing relationship between BUSY, WR, and data validity on ADS7852YB/250?

On ADS7852YB/250, BUSY goes LOW ~20ns after the falling edge of WR and remains LOW for exactly 13.5 clock cycles (tCONV). BUSY rises immediately after conversion completion, and DB0–DB11 data becomes valid 30ns after CS and RD go LOW (which must occur after BUSY is HIGH). Data remains valid for 20ns after CS and RD return HIGH. This strict timing ensures deterministic parallel readout synchronized to the external clock (fCLK = 16 × fSAMPLE).

Does ADS7852YB/250 support simultaneous sampling across all 8 channels, or is it sequential?

The ADS7852YB/250 performs sequential sampling: only one channel (selected by A0–A2) is converted per WR assertion. It does not support true simultaneous sampling across all 8 inputs. However, its 500kHz throughput and 500ns multiplexer settling time allow rapid interleaved acquisition-e.g., 62.5kHz per channel in round-robin mode-with minimal inter-channel skew. For true simultaneous sampling, a multi-ADC solution or dedicated simultaneous-sampling ADC like the ADS85xx family would be required.