Analog Devices Inc. DC997B-A

Overview

DC997B-A from Analog Devices (formerly Linear Technology) is a high-speed ADC evaluation board configured with the LTC2242-12 12-bit, 250 MSPS analog-to-digital converter. It features optimized 10–250 MHz analog input network, LVDS digital outputs, and supports encode clock inputs up to 2.5 V_P-P sine/square wave with 50 Ω source impedance - used for RF receiver, spectrum analyzer, and wideband communications test bench validation.

For engineers reviewing the DC997B-A datasheet, DC997B-A pinout, DC997B-A application, or DC997B-A equivalent, key selection factors include its fixed LTC2242-12 integration, 12-bit/250 MSPS sampling capability, LVDS output interface compatibility, analog input bandwidth optimization, and jumper-configurable mode/Sense/SHDN-OE logic settings.

Technical Context

The DC997B-A implements a dedicated analog front-end with ETC1-1-13 balun and RC network tuned for 10–250 MHz single-ended analog input signals, capacitor-coupled to the LTC2242-12's differential input. Its encode clock path accepts sinusoidal or LVDS sources via SMA, with on-board 50 Ω termination and AC coupling.

Digital output uses LVDS signaling across J2 connector pins: data bits [8–46, 56–82] for 12-bit mode, with isolated ground pins between pairs; LVDS encode clock output appears on J2 pins 50 and 52. JP2, JP3, and JP4 provide hardware-selectable mode, shutdown/output enable, and input range (1 V_PP/2 V_PP) configuration.

Key Specifications

Availability

DC997B-A is available at Aetrix Electronics and suitable for RF receiver development, spectrum analyzer calibration, and wideband communications test equipment requiring stable component supply and validated high-speed ADC evaluation infrastructure.

Supply support for DC997B-A 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, Inc. (acquired Linear Technology in 2017) designs precision signal chain and power management ICs for high-performance data acquisition, instrumentation, and communications systems.

The DC997B-A belongs to Linear Technology's demonstration circuit series targeting high-speed ADC characterization - engineered specifically to validate dynamic performance (SNR, SFDR) of the LTC2242 family under real-world RF input and clock conditions.

FAQ

What ADC is integrated on the DC997B-A evaluation board?

The DC997B-A evaluation board is factory-configured exclusively with the LTC2242-12 - a 12-bit, 250 MSPS high-speed analog-to-digital converter featuring LVDS outputs and optimized for 10–250 MHz analog input frequencies. No other ADC variant is installed or supported on this specific board revision.

Does DC997B-A support both 10-bit and 12-bit operation?

No. The DC997B-A is hardwired for 12-bit operation using the LTC2242-12. While PScope software can mask LSBs to simulate 10-bit behavior, the physical ADC, analog front-end, and LVDS output routing (pins [8–46, 56–82]) are fixed for 12-bit resolution - unlike DC997B-D/E/F variants which use 10-bit parts.

What is the purpose of JP2, JP3, and JP4 jumpers on DC997B-A?

JP2 selects encoding format (2's complement/offset binary) and Clock Duty Cycle Stabilizer enable state; JP3 controls SHDN/OE logic for normal/Nap/Sleep modes; JP4 sets analog input range (1 V_PP or 2 V_PP) by selecting VCM or 2.5 V reference at the LTC2242-12 sense pins - all required for proper ADC biasing and output formatting.

Can DC997B-A be used without the DC890B data capture board?

Yes. DC997B-A LVDS outputs (data and encode clock) are accessible via J2 header pins and can interface directly with logic analyzers or custom FPGA-based acquisition systems using a short 100-pin ribbon cable. However, DC890B + PScope provides automated timing alignment, FFT analysis, and configuration presets optimized for the LTC2242-12.

What analog input signal level and coupling does DC997B-A require?

DC997B-A accepts single-ended analog signals via SMA "AIN" connector, capacitor-coupled through an ETC1-1-13 balun to generate differential input for the LTC2242-12. Input range is selectable: 1 V_PP (JP4 = VCM) or 2 V_PP (JP4 = 2.5 V), with optimal performance between 10 MHz and 250 MHz.