Texas Instruments ADS7950QDBTRQ1

Overview

ADS7950QDBTRQ1 from Texas Instruments is a 12-bit, 4-channel automotive-grade SAR ADC with 1-MSPS throughput, 2.7–5.25 V analog supply, and dual unipolar input ranges (0–2.5 V or 0–5 V). It integrates four programmable GPIOs, per-channel high/low alarms, and operates from –40°C to 125°C for battery monitoring in EV powertrain control units.

For engineers reviewing the ADS7950QDBTRQ1 datasheet, ADS7950QDBTRQ1 pinout, ADS7950QDBTRQ1 application, or ADS7950QDBTRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, TSSOP-30 package, 14.5 mW typical power at 1 MSPS, GPIO-configurable alarm outputs, and serial SPI interface with MSB-first data format.

Technical Context

The ADS7950QDBTRQ1 implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold, supporting auto/manual channel sequencing across four single-ended inputs. Its analog front-end accepts either 0–2.5 V or 0–5 V unipolar ranges via GPIO2-controlled range selection.

Digital operation uses separate analog (+VA) and I/O (+VBD) supplies (1.7–5.25 V), enabling level-shifting between domains. Alarm thresholds are programmable per channel in hex (0–FFC), and conversion results are output via SDO with precise timing-800 ns conversion time and 5 ns aperture delay at 20-MHz SCLK.

Key Specifications

Pinout & Package

ADS7950QDBTRQ1 is housed in a 30-pin TSSOP package (7.80 mm × 4.40 mm) with exposed pad for thermal management. Pin functions are validated per TI SBAS652A datasheet Rev. A (August 2014).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with ADS7951QDBTRQ1 and ADS7952QDQMRQ1, the ADS7950QDBTRQ1 offers optimal cost and layout efficiency for 4-channel automotive sensing where channel expansion headroom is not required.

Availability

ADS7950QDBTRQ1 is available at Aetrix Electronics and suitable for automotive powertrain control, battery management systems, and onboard charger monitoring requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADS7950QDBTRQ1 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 deep expertise in automotive-grade IC design and manufacturing.

The ADS79xx-Q1 product line was engineered specifically for automotive signal acquisition - delivering AEC-Q100 qualified, low-power, multichannel SAR ADCs with integrated alarms and flexible I/O for next-generation electric vehicle subsystems.

FAQ

What is the maximum SCLK frequency supported by ADS7950QDBTRQ1?

The ADS7950QDBTRQ1 supports up to 20 MHz SCLK frequency, enabling full 12-bit conversions at 1 MSPS throughput. Timing parameters including setup/hold times and propagation delays are specified across 1.8-V, 3-V, and 5-V I/O supply conditions, ensuring reliable operation with diverse host controllers. The ADS7950QDBTRQ1 maintains 800 ns conversion time and 5 ns aperture delay at this rate.

Does ADS7950QDBTRQ1 require an external reference voltage?

Yes, the ADS7950QDBTRQ1 requires an external reference voltage applied to REFP (2–3 V, typical 2.5 V) with REFM tied to analog ground. It does not include an internal reference. The device specifies 100-kΩ reference input resistance and supports low-noise references like the REF5025 to achieve 71.7-dB SNR. Reference stability directly impacts total unadjusted error (±2 LSB).

How are the GPIO pins configured on ADS7950QDBTRQ1?

The four GPIOs (GPIO0–GPIO3) on ADS7950QDBTRQ1 are programmable via SPI commands to operate as inputs, outputs, or dedicated alarm indicators. For example, GPIO1 can be set as active-high low-alarm output, and GPIO2 controls input range selection (high = 0–5 V, low = 0–2.5 V). Configuration is retained after power-up and detailed in Table 12 of the SBAS652A datasheet.

What is the power consumption of ADS7950QDBTRQ1 in normal and power-down modes?

In normal operation at 5 V analog supply and 1-MSPS throughput, ADS7950QDBTRQ1 draws 2.3–3 mA (typical 2.65 mA), equating to ~14.5 mW. In static state at 5 V, it consumes 1.1–1.5 mA. When power-down mode is activated via PD pin (GPIO3), supply current drops to 1 μA - critical for energy-sensitive automotive sleep modes. Power-up time is 1 µs.

Is ADS7950QDBTRQ1 pin-compatible with other devices in the ADS79xx-Q1 family?

No, ADS7950QDBTRQ1 is not pin-compatible with higher-channel variants. It uses the 30-pin TSSOP (DBT) package shared only with ADS7951-Q1, ADS7954-Q1, and ADS7958-Q1. ADS7952-Q1 and ADS7953-Q1 use the 38-pin TSSOP package. While pinouts within the 30-pin group share core signals (SDO, SCLK, etc.), channel count and NC pin assignments differ - PCB layout must match the exact variant.