Analog Devices Inc. DC540A-B

Overview

DC540A-B from Analog Devices (formerly Linear Technology) is a general-purpose data acquisition demonstration board built around the LTC1604 and LTC1608 16-bit successive approximation ADCs. It supports ±2.5V fully differential analog inputs, delivers 90 dB SINAD and –100 dB SFDR at 5 kHz, operates at up to 500 Ksps (LTC1608), and includes an LT1469-based differential input amplifier with 19.1 dB gain for high-impedance signal conditioning.

For engineers reviewing the DC540A-B datasheet, DC540A-B pinout, DC540A-B application, or DC540A-B equivalent, this board serves as a validated 4-layer PCB reference design for high-performance analog-to-digital conversion-emphasizing ground partitioning, bypassing strategy, clock jitter sensitivity, and amplifier-ADC interface layout.

Technical Context

The DC540A-B implements dual 16-bit SAR ADCs-LTC1604 (333 Ksps max) and LTC1608 (500 Ksps max)-with no pipeline delay and identical pinouts. Both feature ±2.5V differential input ranges, 90 dB SNR at 100 kHz, and –94 dB THD, enabling direct comparison of speed vs. settling trade-offs in real-world acquisition setups.

It integrates an LT1469 dual op-amp configured for 19.1 dB differential gain, second-order anti-disturbance filtering (800 kHz / 10 MHz poles), and 50 Ω-terminated inputs. The board requires external TTL/CMOS clocking and ±5V analog supplies, with optional +3V OVDD for digital output interfacing.

Key Specifications

Availability

DC540A-B is available at Aetrix Electronics and suitable for precision data acquisition, mixed-signal test bench development, and high-fidelity analog front-end prototyping requiring stable component supply and proven reference layout practices.

Supply support for DC540A-B 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

Analog Devices designs, manufactures, and supports high-performance analog, mixed-signal, and RF integrated circuits for precision measurement, signal processing, and power management applications.

The DC540A-B belongs to Analog Devices' demonstration circuit portfolio, developed specifically to accelerate engineering validation of high-speed, high-resolution data converters through physically realized, layout-optimized reference designs.

FAQ

What is the primary purpose of the DC540A-B?

The DC540A-B is a demonstration circuit designed to evaluate the LTC1604 and LTC1608 16-bit SAR ADCs in real-world conditions. It provides a fully assembled, 4-layer PCB reference design that validates layout techniques-including analog/digital/clock ground separation, bypass capacitor placement, and amplifier-ADC interface integrity-for achieving datasheet-grade performance. The DC540A-B itself is not an IC but a functional evaluation platform.

Which ADCs are mounted on the DC540A-B board?

The DC540A-B board features both the LTC1604 and LTC1608 16-bit successive approximation ADCs, pre-mounted and pin-compatible. The LTC1604 supports up to 333 Ksps, while the LTC1608 supports up to 500 Ksps; both share identical input specifications (±2.5V differential), 90 dB SINAD, and –100 dB SFDR at 5 kHz. The DC540A-B allows side-by-side comparison of their speed and settling behavior.

Does the DC540A-B include signal conditioning circuitry?

Yes-the DC540A-B incorporates an LT1469 dual operational amplifier configured for 19.1 dB differential gain, with optional unity-gain operation via jumper modification. It also includes a second-order filter network (800 kHz / 10 MHz poles) between the amplifier and ADC to suppress sampling-induced disturbances and limit input noise bandwidth. The DC540A-B thus supports high-impedance or gain-required signal sources without external front-end redesign.

What power supplies does the DC540A-B require?

The DC540A-B requires ±5V analog supplies (VDD = +5V, VSS = –5V) and optionally +3V for OVDD (digital output voltage). Typical current draw is 30–35 mA from +5V and 40–49 mA from –5V, depending on whether the LTC1604 or LTC1608 is active. The +3V supply is only needed if OVDD is not jumpered to +5V; it may range from 2.7V to 5V. The DC540A-B does not include onboard voltage regulation.

Can the DC540A-B be used with single-ended input signals?

Yes-but with constraints. A single-ended signal can be applied to either AIN+ or AIN– input, provided the other input is shorted to ground or terminated with 50 Ω (by removing R16/R17 if not using 50 Ω–grounded differential sources). When using the on-board LT1469 amplifier as populated, a single-ended input yields a differential drive to the ADC with 22 dB common-mode rejection relative to the differential component. The DC540A-B supports both buffered and direct signal paths via jumpers JP4–JP7.