Texas Instruments ADS7827IDRBT

Overview

ADS7827IDRBT from Texas Instruments is an 8-bit, 250 kSPS successive approximation register (SAR) analog-to-digital converter with pseudo-differential rail-to-rail input, micropower auto power-down (<60 µW at 7.5 kHz), and SPI™-compatible 3-wire serial interface. It operates from 2.7 V to 5.25 V supply and supports reference voltages from 50 mV to VCC, targeting low-power sensor signal digitization in portable instrumentation.

For engineers reviewing the ADS7827IDRBT datasheet, ADS7827IDRBT pinout, ADS7827IDRBT application, or ADS7827IDRBT equivalent, key selection criteria include its 8-bit resolution, 250 kSPS throughput at 2.7 V, 25 pF analog input capacitance, 3 µA max power-down current, and SON-8 package compatibility with space-constrained embedded systems.

Technical Context

The ADS7827IDRBT implements a capacitive redistribution SAR architecture fabricated in 0.6 µm CMOS, integrating sample/hold functionality without external components. Its conversion cycle requires exactly 9 DCLOCK cycles (12 for ADS7829, 11 for ADS7826), with acquisition time fixed at 1.5 DCLOCK cycles.

It uses a synchronous 3-wire serial interface where DOUT outputs MSB-first on the falling edge of DCLOCK after one null bit; CS/SHDN serves dual role-chip select when low, full shutdown when high-reducing quiescent current to ≤3 µA.

Key Specifications

Pinout & Package

ADS7827IDRBT is housed in an 8-pin 3 × 3 mm PDSO (SON) package - same footprint as QFN - with wettable flanks for automated optical inspection. Pin functions are validated per TI SLAS388 datasheet Figure 4 (top view).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with ADS7826IDRBT and ADS7829IDRBT, the ADS7827IDRBT delivers optimal balance of speed (250 kSPS), power efficiency (<60 µW at 7.5 kHz), and package size for cost-sensitive, space-constrained applications where 8-bit resolution suffices.

Availability

ADS7827IDRBT is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, isolated signal conditioning, and simultaneous multichannel sampling requiring stable component supply and long-term manufacturability.

Supply support for ADS7827IDRBT 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 low-power design.

The ADS7826/27/29 family was engineered for ultra-low-power, high-speed sampling in portable and remote instrumentation-prioritizing micropower operation, small footprint, and flexible reference architecture over raw resolution.

FAQ

What is the maximum DCLOCK frequency supported by the ADS7827IDRBT?

The ADS7827IDRBT supports a maximum DCLOCK frequency of 3 MHz, enabling its full 250 kSPS throughput at 2.7 V supply. At lower supply voltages (2.0–2.7 V), the maximum clock rate drops below 1.2 MHz per datasheet Section 3. The minimum DCLOCK frequency is 10 kHz, allowing ultra-low-power operation at reduced sample rates.

Does the ADS7827IDRBT require an external reference voltage?

Yes, the ADS7827IDRBT requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 50 mV to VCC, and the full-scale input range is directly proportional to this reference. No internal reference is provided; external bypassing with a 0.1 µF capacitor is mandatory for stable operation.

How does the CS/SHDN pin function in the ADS7827IDRBT?

The CS/SHDN pin on the ADS7827IDRBT serves dual functions: when driven LOW, it acts as chip select to initiate conversion and enable serial data output; when driven HIGH, it places the device into full power-down mode, reducing supply current to ≤3 µA. This dual-role pin eliminates the need for separate control lines.

What is the analog input structure of the ADS7827IDRBT?

The ADS7827IDRBT features a pseudo-differential analog input with dedicated +IN and –IN pins. The +IN pin accepts voltages from –0.2 V to VCC+0.2 V, while –IN is limited to –0.2 V to 1.0 V. This configuration supports true differential measurements or single-ended operation with remote ground sensing, but –IN is not re-sampled during conversion.

Can the ADS7827IDRBT operate from a 2.0 V supply?

Yes, the ADS7827IDRBT operates from 2.0 V to 5.25 V, but specifications are only assured at 2.7 V. At 2.0–2.7 V, maximum throughput drops to 100 kSPS, and reference voltage must be limited to 1.024–1.25 V per datasheet Section 3. Full performance (250 kSPS, ±1 LSB INL/DNL) requires VCC ≥ 2.7 V.