Texas Instruments ADC108S102CIMTX

Overview

ADC108S102 from Texas Instruments is a low-power, 8-channel, 10-bit successive-approximation ADC with 500 kSPS to 1 MSPS throughput, independent analog (VA: +2.7V to +5.25V) and digital (VD: +2.7V to VA) supplies, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates across −40°C to +105°C and is used in portable instrumentation for multi-sensor signal acquisition.

For engineers reviewing the ADC108S102 datasheet, ADC108S102 pinout, ADC108S102 application, or ADC108S102 equivalent, this page delivers verified specifications, TSSOP-16 pin mapping, real-world use scenarios, and two validated alternative parts - all grounded in TI's SNAS336B revision March 2013 datasheet.

Technical Context

The ADC108S102 employs a charge-redistribution DAC architecture with internal track-and-hold, acquiring input voltage over 3 SCLK cycles and completing conversion in 13 SCLK cycles (total 16-cycle frame). Its 8-input multiplexer supports channel selection via 3-bit address (ADD2–ADD0) in the control register loaded on DIN.

It features straight-binary output, ±0.5 LSB max INL/DNL at VA = VD = 5.0 V, 61.3 dB SINAD at 40.2 kHz, and 79.7 dB channel-to-channel isolation. Power-down mode reduces consumption to 0.09 µW (3 V) or 0.30 µW (5 V) when CS is high.

Key Specifications

Pinout & Package

ADC108S102 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for compact PCB layouts and thermal performance (θ_JA = 96°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel, 10-bit SAR ADC applications.

Compared with ADS7953SRHBT and MAX11100ETK+, the ADC108S102 uniquely balances 8-channel count, true dual-supply operation, and sub-µW shutdown - making it optimal for portable, multi-sensor industrial and medical devices requiring flexible voltage scaling and minimal standby loss.

Availability

ADC108S102 is available at Aetrix Electronics and suitable for automotive navigation, portable medical instrumentation, and industrial control systems requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.

Supply support for ADC108S102 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The ADC108S102 belongs to TI's precision SAR ADC product line, designed specifically for multi-channel, low-power, high-reliability signal acquisition in harsh environments - including automotive, medical, and factory automation applications.

FAQ

What is the maximum clock frequency supported by ADC108S102?

The ADC108S102 supports a maximum SCLK frequency of 16 MHz, as specified in its absolute maximum ratings and AC electrical characteristics. Operation above this frequency risks timing violations, incomplete conversions, and invalid DOUT data. The minimum clock is 8 MHz for guaranteed 1 MSPS throughput; lower frequencies reduce sample rate proportionally. All timing parameters - including tDACC, tDHLD, and tCONVERT - are validated within the 8–16 MHz range per SNAS336B.

Does ADC108S102 require an external reference voltage?

No, ADC108S102 does not require an external reference. It uses the analog supply voltage (VA) as its internal reference, with input range defined as 0 V to VA. This eliminates external reference components and simplifies layout, but requires VA to be low-noise and stable - TI specifies 1 µF + 0.1 µF bypassing within 1 cm of the VA pin to maintain ±0.5 LSB linearity. Deviations in VA directly scale the LSB size (LSB = VA / 1024).

How is channel selection implemented on ADC108S102?

Channel selection on ADC108S102 is controlled via a 3-bit address (ADD2–ADD0) written to the control register through the DIN pin during the first 8 rising edges of SCLK after CS falls. The mapping is fixed: ADD2:ADD1:ADD0 = 000 selects IN0 (default), 001 selects IN1, up to 111 for IN7. Bits 7, 6, 2, 1, and 0 are "don't care" and may be set to any value without affecting operation.

What is the power consumption of ADC108S102 in shutdown mode?

In shutdown mode (CS high), ADC108S102 consumes 0.09 µW typical at VA = VD = 3.0 V and 0.30 µW typical at VA = VD = 5.0 V. This ultra-low power state is achieved by disabling internal bias circuits and placing DOUT in high-impedance. The specification is measured with fSCLK = 0 kSPS and confirmed across −40°C to +105°C per SNAS336B Electrical Characteristics table.

Can ADC108S102 operate with VA = 3.3 V and VD = 1.8 V?

No, ADC108S102 cannot operate with VD = 1.8 V when VA = 3.3 V. Per the Operating Ratings, VD must be ≥ +2.7 V and ≤ VA. Therefore, if VA = 3.3 V, VD must be between +2.7 V and +3.3 V. Setting VD below +2.7 V violates the absolute minimum rating and may cause logic failure or undefined DOUT behavior. TI explicitly states VD range is +2.7 V to VA - not a fixed offset or ratio.