Texas Instruments TLV2785CPWR

Overview

TLV2785CPWR from Texas Instruments is a quad rail-to-rail input/output operational amplifier optimized for low-voltage, low-power precision signal conditioning. It operates from 1.8 V to 3.6 V supply, delivers 8 MHz gain-bandwidth, 4.8 V/µs slew rate (at VDD = 2.7 V), 9 nV/√Hz input noise at 10 kHz, and supports −40°C to 125°C industrial temperature range. It is used in battery-powered sensor front-ends and high-resolution ADC driver stages.

For engineers reviewing the TLV2785CPWR datasheet, TLV2785CPWR pinout, TLV2785CPWR application, or TLV2785CPWR equivalent, key selection criteria include its shutdown-enabled quad architecture, TSSOP-16 package footprint, rail-to-rail I/O swing down to 1.8 V, and verified performance in low-noise, high-speed analog signal chains with capacitive load drive capability.

Technical Context

The TLV2785CPWR integrates four independent amplifiers sharing a common shutdown control (1/2SHDN and 3/4SHDN pins), enabling selective channel disablement to reduce system power. Its input stage uses CMOS technology with VICR extending −0.2 V below GND and +0.2 V above VDD, supporting true single-supply operation across the full input range.

Each amplifier features unity-gain-stable compensation, 58° phase margin into 2 kΩ//25 pF, and maintains 8 MHz GBW across 1.8–3.6 V supply. Shutdown mode reduces per-channel current to ≤1.7 µA, with 200 ns turnoff and 800 ns turnon times - critical for duty-cycled portable instrumentation.

Key Specifications

Pinout & Package

TSSOP-16 package (PW suffix), 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.

Compared with TLV2785IPW, TLV2785CPWR trades extended temperature support and tighter offset for lower cost and sufficient performance in commercial-grade portable equipment; versus OPA4340UA, it delivers 43% lower supply current and integrated shutdown at the expense of maximum supply voltage headroom.

Availability

TLV2785CPWR is available at Aetrix Electronics and suitable for portable medical devices, multi-sensor IoT nodes, battery-powered data loggers, and precision DAC output buffering requiring stable component supply across production lifecycles.

Supply support for TLV2785CPWR 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 over 90 years of innovation in precision analog ICs.

The TLV278x family was designed specifically for ultra-low-voltage, low-power precision signal conditioning in portable and energy-constrained systems - emphasizing rail-to-rail operation, sub-1-mA quiescent current, and robust capacitive load drive.

FAQ

What is the maximum capacitive load the TLV2785CPWR can drive without external compensation?

The TLV2785CPWR remains stable with ≤10 pF capacitive load directly on its output. For loads exceeding 10 pF - such as ADC input capacitance or long PCB traces - a series resistor (RNULL) of 10–50 Ω must be added between the amplifier output and the load to maintain ≥58° phase margin and prevent ringing. This requirement is confirmed in Figure 30 and Application Information section of the SLOS245E datasheet for TLV2785CPWR.

Does the TLV2785CPWR support true single-supply operation with input signals below ground?

Yes, the TLV2785CPWR supports common-mode input voltages down to −0.2 V relative to GND, verified across its full operating range (0°C to 70°C). This allows direct interfacing with transducers whose output swings slightly negative - such as certain piezoelectric sensors or bridge circuits with offset - without requiring level-shifting circuitry. The specification is explicitly stated in the Recommended Operating Conditions table for TLV2785CPWR.

How does the shutdown functionality work on the TLV2785CPWR, and what happens to the outputs during shutdown?

The TLV2785CPWR has two independent shutdown controls: Pin 8 (1/2SHDN) disables amplifiers A and B, while Pin 16 (3/4SHDN) disables amplifiers C and D. When a shutdown pin is pulled ≤0.6 V, the corresponding amplifiers enter high-impedance state with output leakage <100 nA and supply current reduced to ≤1.7 µA total for both channels. Outputs do not short or clamp - they float, preserving external bias networks. This behavior is documented in the Shutdown Characteristics table for TLV2785CPWR.

What is the typical input bias current of the TLV2785CPWR, and how does it affect high-impedance sensor interfaces?

The TLV2785CPWR exhibits a typical input bias current of 2.5 pA (max 100 pA over temperature), measured at 25°C with VDD = 1.8–3.6 V. This ultra-low value minimizes voltage error across high-value feedback or sensor-source impedances - for example, introducing only 2.5 µV error across a 1 MΩ source. It enables direct connection to pH electrodes, photodiodes, and piezoelectric elements without guard rings or bias compensation networks, as confirmed in the Input Characteristics section of the TLV2785CPWR datasheet.

Can the TLV2785CPWR be used in a unity-gain stable configuration, and what is its phase margin?

Yes, the TLV2785CPWR is unity-gain stable with a measured phase margin of 58° when driving a 2 kΩ load with 25 pF capacitance, tested at VDD = 1.8 V and 2.7 V. This stability holds across the full 1.8–3.6 V supply range and 0°C to 70°C temperature range. No external compensation is required for gains ≥1, making it suitable for voltage followers, active filters, and precision buffers - as validated in Figure 13 (AVD vs Frequency) and the Dynamic Performance tables for TLV2785CPWR.