Texas Instruments ADS901E/1KG4

Overview

ADS901E/1KG4 from Texas Instruments is a 10-bit, 20 MSPS pipelined analog-to-digital converter operating from a +3V single supply, featuring digital error correction, wideband track/hold (350 MHz small-signal bandwidth), and external reference control for adjustable full-scale input range. It delivers 53 dB SNR at 500 kHz and guarantees no missing codes-used in high-fidelity video digitization and portable test instrumentation.

For engineers reviewing the ADS901E/1KG4 datasheet, ADS901E/1KG4 pinout, ADS901E/1KG4 application, or ADS901E/1KG4 equivalent, key selection criteria include sampling rate vs. SFDR trade-offs, external reference voltage sourcing (REFT/REFB), power-down timing (133 ns enable), CMOS-compatible 3-state outputs, and SSOP-28 thermal performance (θ_JA = 89°C/W).

Technical Context

The ADS901E/1KG4 implements a 9-stage pipelined quantizer architecture with two-bit per stage resolution and redundant bits fed into digital error correction logic to ensure ±0.8 LSB differential linearity at 500 kHz and no missing codes across temperature (–40°C to +85°C). Its fully differential track/hold supports both single-ended and differential input configurations via programmable common-mode voltage (V_CM = (REFT + REFB)/2).

Timing is synchronized to an external CMOS clock with 5-cycle data latency; output coding is Straight Offset Binary (SOB), and digital I/O uses dedicated LVDD (pin 2) for level-shiftable 3-state CMOS outputs. Power-down mode reduces dissipation from 49 mW to 15 mW while placing outputs in high-impedance state.

Key Specifications

Pinout & Package

ADS901E/1KG4 is housed in a 28-pin Shrink Small Outline Package (SSOP-28), 5.3 mm × 10.2 mm body, 0.65 mm pitch, JEDEC MO-153 compliant, with θ_JA = 89°C/W and moisture sensitivity level (MSL) 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 10-bit ADC applications.

Compared with MAX1186EEE+ and AD9215BRUZ-20, ADS901E/1KG4 uniquely combines external reference adjustability, SSOP-28 compactness, and guaranteed no-missing-codes performance at 20 MSPS-making it optimal for cost-sensitive, space-constrained video and imaging designs requiring flexible analog input scaling.

Availability

ADS901E/1KG4 is available at Aetrix Electronics and suitable for camcorder video digitization, digital camera image pipelines, computer scanner analog front-ends, portable test instrumentation, and battery-powered equipment requiring stable component supply and long-term industrial availability.

Supply support for ADS901E/1KG4 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 high-performance analog ICs, with decades of leadership in data converters and signal chain solutions.

The ADS901E/1KG4 belongs to TI's high-speed pipeline ADC product line, designed specifically for demanding video, imaging, and portable instrumentation applications requiring low power, wide bandwidth, and precise dc accuracy under single +3V operation.

FAQ

What is the maximum sampling rate supported by the ADS901E/1KG4?

The ADS901E/1KG4 supports a maximum sampling rate of 20 million samples per second (20 MSPS), validated across its full operating temperature range (–40°C to +85°C) and supply voltage range (+2.7V to +3.7V). This rate is achievable with a 50 ns minimum clock period and fast-rising clock edges (≤2 ns), as specified in the SBAS054A datasheet timing diagram.

Does the ADS901E/1KG4 require external reference voltages, and what are their valid ranges?

Yes, the ADS901E/1KG4 requires two external reference voltages applied to REFT (pin 22) and REFB (pin 24). Valid ranges are REFT = REFB + 0.5 V to VS – 0.8 V, and REFB = 0.8 V to REFT – 0.5 V, with typical values of +2.0 V and +1.0 V yielding a 1 V_p-p full-scale input range. The internal 4 kΩ resistor ladder draws ~250 µA from each source.

How does the power-down mode affect the ADS901E/1KG4's outputs and timing behavior?

When Pwrdn (pin 17) is driven HIGH, the ADS901E/1KG4 enters power-down mode, reducing power dissipation from 49 mW to 15 mW and placing all digital outputs in high-impedance 3-state. After exiting power-down (Pwrdn → LOW), the first five output words are invalid due to internal pipeline reset-this 5-clock-cycle latency is identical to normal operation.

What is the meaning of "Straight Offset Binary" coding in the ADS901E/1KG4, and how is zero represented?

Straight Offset Binary (SOB) coding in the ADS901E/1KG4 maps the mid-scale analog input (e.g., +1.5 V with REFT = +2 V, REFB = +1 V) to binary 1000000000 (512 decimal), representing bipolar zero. Full-scale positive (+2 V) is 1111111111 (1023), and full-scale negative (+1 V) is 0000000000 (0). This format simplifies interface with DSPs and FPGAs lacking two's complement hardware.

Can the ADS901E/1KG4 be used in undersampling applications, and what limits its performance at high input frequencies?

Yes, the ADS901E/1KG4 supports undersampling with a small-signal analog input bandwidth of 350 MHz. Performance at high input frequencies is primarily limited by aperture jitter (7 ps rms), which degrades SNR according to SNR = 20 log₁₀[1/(2π·f_IN·t_A)]. At f_IN = 20 MHz, this yields a theoretical SNR limit of ~52 dB-consistent with measured 48 dB at 9 MHz in the datasheet.