Texas Instruments ADS7865IPBSR

Overview

ADS7865IPBSR from Texas Instruments is a dual, 12-bit, 2MSPS simultaneous-sampling analog-to-digital converter with four fully differential or six pseudo-differential input channels, internal 2.5V reference with 10-bit DAC programmability, parallel CMOS interface, and operation from –40°C to +125°C in TQFP-32 package - used for high-precision motor control and multi-axis positioning systems.

For engineers reviewing the ADS7865IPBSR datasheet, ADS7865IPBSR pinout, ADS7865IPBSR application, or ADS7865IPBSR equivalent, key selection considerations include simultaneous dual-channel sampling, ±VREF differential input range, 71.7dB SNR at 100kHz, programmable reference output, and compatibility with industrial temperature-grade signal acquisition designs.

Technical Context

The ADS7865IPBSR implements two independent SAR ADCs sharing a common 32MHz external clock, each with a fully differential 2:1 input multiplexer configurable for pseudo-differential 3:1 mode. Conversion starts on CONVST falling edge and completes in 13 clock cycles (406.25ns at 32MHz), followed by 62.5ns acquisition time.

Its analog front-end maintains full differential signaling through sample-and-hold to ADC core, delivering 72dB CMRR at 100kHz. The integrated 10-bit DAC drives REFOUT with 2.44mV step resolution, enabling precise reference voltage tuning between 0.5V and 2.515V while maintaining ±10ppm/°C drift.

Key Specifications

Pinout & Package

TQFP-32 package with exposed thermal pad; 0.8mm pitch, 7mm × 7mm body, JEDEC MO-220 standard footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.

Compared with ADS7862IPBS, ADS7865IPBSR adds reference DAC tuning and power management; compared with AD7322BRUZ, it delivers higher speed and integrated reference control but narrower input range configurability.

Availability

ADS7865IPBSR is available at Aetrix Electronics and suitable for motor control, multi-axis positioning systems, and three-phase power control requiring stable component supply across extended temperature ranges.

Supply support for ADS7865IPBSR 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 signal chain solutions.

The ADS7865IPBSR belongs to TI's high-performance simultaneous-sampling ADC product line, designed specifically for real-time closed-loop control in harsh industrial and automotive environments.

FAQ

What is the maximum sampling rate of the ADS7865IPBSR?

The ADS7865IPBSR achieves a maximum sampling rate of 2MSPS per ADC channel. This is realized with a 32MHz external CLOCK input, where each conversion requires 13 clock cycles plus acquisition time. At full speed, the device delivers synchronized 12-bit results from both ADCs every 500ns, enabling high-bandwidth control loop execution in servo drives and inverters. The ADS7865IPBSR maintains this rate across its full operating temperature range of –40°C to +125°C.

Does the ADS7865IPBSR require an external reference voltage?

No, the ADS7865IPBSR includes an integrated 2.5V internal reference with a programmable 10-bit DAC output on the REFOUT pin. It can operate autonomously using this reference, or accept an external 0.5V–2.525V source via REFIN. When using the internal reference, REFOUT delivers 2.500V ±15mV at +25°C with ±10ppm/°C drift. The ADS7865IPBSR's DAC allows adjustment in 2.44mV steps, making external references unnecessary for most precision applications.

How does the ADS7865IPBSR handle simultaneous sampling across two ADCs?

The ADS7865IPBSR uses a shared CONVST signal to initiate simultaneous hold operations on both ADCs' sample-and-hold circuits. Upon the falling edge of CONVST, both input paths freeze their analog values independently, then convert in parallel using the same CLOCK. Channel-to-channel propagation delay match is specified at ≤50ps, ensuring time-aligned digitization critical for vector control and power quality analysis. The ADS7865IPBSR outputs results via DB[11:0] in interleaved or sequential format based on configuration register settings.

What power-saving features does the ADS7865IPBSR support?

The ADS7865IPBSR offers three power-down modes: Nap mode reduces analog supply current to 0.9–1.6mA at 2.7V, Deep Power-Down cuts it to 1μA, and Auto-Nap automatically enters low-power state between conversions. These are controlled via DP, N, and AN bits in the configuration register. At 5V AVDD and 3V BVDD, total power dissipation is 44mW maximum during active conversion. The ADS7865IPBSR's separate AVDD/BVDD supplies further optimize efficiency by allowing independent voltage scaling for analog and digital domains.

Can the ADS7865IPBSR interface directly with a 3.3V microcontroller?

Yes, the ADS7865IPBSR supports mixed-voltage operation: AVDD can be 2.7–5.5V for analog performance, while BVDD may be independently set to 2.7–5.5V - including 3.3V - to match microcontroller I/O levels. Its parallel interface uses CMOS-compatible logic thresholds (VIH = 0.7×BVDD, VIL = 0.3×BVDD), and output drivers meet VOL ≤0.2V and VOH ≥BVDD–0.2V at 100μA load. The ADS7865IPBSR's CS, RD, WR, and BUSY signals are fully compatible with 3.3V controllers without level shifters.