Texas Instruments ADS7834PB

Overview

ADS7834PB from Texas Instruments is a 12-bit successive approximation register (SAR) analog-to-digital converter with integrated sample/hold, internal 2.5V reference, and synchronous serial interface. It delivers 500kHz throughput at 11mW typical power dissipation, supports differential input (±0.2V on –IN), and operates over –40°C to +85°C in MSOP-8 package. It is used in portable spectrum analyzers and battery-powered data loggers.

For engineers reviewing the ADS7834PB datasheet, ADS7834PB pinout, ADS7834PB application, or ADS7834PB equivalent, key selection criteria include guaranteed ±1 LSB integral linearity, 72dB SNR at 10kHz, 1.625µs conversion time, and support for LSB-first serial output via CONV control - all critical for high-fidelity, low-power embedded signal acquisition.

Technical Context

The ADS7834PB implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample/hold functionality without external components. Its internal 2.5V bandgap reference is buffered and can be overdriven by an external 2.0V–2.55V source via a 10kΩ ±30% series resistor.

Digital interface timing is asynchronous between CONV and CLK: conversion start is triggered on the falling edge of CONV, independent of clock phase, while serial data (MSB-first by default) is synchronized to CLK rising edges. Power-down mode activates when CONV remains LOW through the 13th clock cycle, reducing supply current to 0.5mA.

Key Specifications

Pinout & Package

ADS7834PB is packaged in an MSOP-8 (DGK) surface-mount package with exposed pad, rated for –40°C to +85°C operation. Pin assignments are identical to ADS7834EB and validated per TI SBAS098A datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7834EB, ADS7834PB offers identical performance in rail packaging for flexibility in small-batch builds; versus ADS8320EB, ADS7834PB provides 5× higher throughput and guaranteed 12-bit linearity at lower system cost - making it optimal for portable, battery-constrained, medium-resolution acquisition.

Availability

ADS7834PB is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor networks, and DSP-based signal acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for ADS7834PB 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 digital signal technologies, with decades of expertise in precision data converters.

The ADS7834PB belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, high-fidelity signal acquisition in battery-operated test and measurement equipment.

FAQ

What is the guaranteed integral linearity error for ADS7834PB across its operating temperature range?

The ADS7834PB guarantees ±1 LSB integral linearity error over the full –40°C to +85°C temperature range, as specified in the TI SBAS098A datasheet under the ADS7834PB ordering option. This is tighter than the ±2 LSB spec for ADS7834P/E variants and ensures consistent measurement accuracy in uncontrolled thermal environments where the ADS7834PB is deployed.

Can ADS7834PB operate with an external reference voltage, and what is the valid input range?

Yes, ADS7834PB supports external reference voltages applied to the VREF pin. The valid range is 2.0 V to 2.55 V, corresponding to an analog input span of 2.0 V to 2.55 V. This is enabled by an internal 10 kΩ ±30% series resistor that isolates the external source from the internal bandgap, allowing overdrive without damage while maintaining specified linearity and noise performance.

How does the power-down mode function in ADS7834PB, and what is its impact on supply current?

ADS7834PB enters power-down mode when the CONV pin remains LOW through the 13th clock cycle of a conversion sequence. In this state, supply current drops to 0.5 mA (typical), reducing total power dissipation to 2.5 mW - a >75% reduction versus active 500 kHz operation. Recovery is immediate: the first conversion after CONV goes HIGH is fully valid, with no wake-up delay.

What are the absolute maximum ratings for analog input voltage on ADS7834PB?

For ADS7834PB, the absolute maximum analog input voltage on +IN is –0.3 V to (VCC + 0.3 V), and on –IN is –0.3 V to +0.3 V relative to GND. Exceeding these limits risks permanent damage. For linear operation, +IN must remain within GND – 0.2 V to VREF + 0.2 V, and –IN within –0.2 V to +0.2 V - violating these degrades INL and DNL beyond specification.

Does ADS7834PB support LSB-first serial data transmission, and how is it enabled?

Yes, ADS7834PB supports LSB-first serial output. It is enabled by asserting CONV HIGH during the 12th clock cycle of a conversion, then pulling CONV LOW during the 13th clock cycle (when D0, the LSB, is present). This triggers LSB-first retransmission of all 12 bits over the next 12 clocks and simultaneously places the device into power-down mode until CONV rises again.