Analog Devices Inc. LTC1740CG#PBF

Overview

LTC1740CG#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 6 Msps sampling analog-to-digital converter with pipelined architecture, integrated sample-and-hold, and programmable internal reference. It operates from single 5 V or dual ±5 V supplies, delivers 79 dB S/(N+D) at 2.5 MHz input, and features true differential inputs with 75 dB CMRR - used in high-speed spectral analysis and telecommunications data acquisition systems.

For engineers reviewing the LTC1740CG#PBF datasheet, LTC1740CG#PBF pinout, LTC1740CG#PBF application, or LTC1740CG#PBF equivalent, key selection criteria include its 80 MHz full-power bandwidth, ±2.5 V bipolar input range with internal 4.5 V reference, 100 ns conversion time, out-of-range indicator (OF), and 36-pin SSOP package compatibility with mixed-signal PCB layouts requiring low-jitter clocking and clean analog grounding.

Technical Context

The LTC1740CG#PBF implements a 14-bit pipelined CMOS ADC core with on-chip sample-and-hold optimized for 6 Msps continuous operation. Its differential input stage supports arbitrary common-mode voltage (including 2.5 V signal ground) and achieves 75 dB CMRR, enabling rejection of ground-loop noise in multiplexed acquisition systems.

Digital correction logic ensures no missing codes over temperature, while flexible reference programming via SENSE pin allows selection of ±2.5 V or ±1.25 V full-scale ranges using internal 4.5 V or 2.25 V references - or external reference drive up to ±VREF/1.8. Output logic uses separate OVDD supply (2.7–5.25 V) for direct interfacing to 3 V or 5 V digital systems.

Key Specifications

Pinout & Package

Package: 36-lead plastic SSOP (0.209 inch width), RoHS-compliant, moisture-sensitive level 3. Thermal resistance θ_JA = 95°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9240ASTZ-65 and MAX1186ETM+, the LTC1740CG#PBF uniquely balances 6 Msps performance with dual-supply flexibility, integrated 2.5 V VCM reference, and true differential input - making it optimal for cost-sensitive, mixed-voltage test equipment and telecom line-card designs where layout simplicity and supply versatility are critical.

Availability

LTC1740CG#PBF is available at Aetrix Electronics and suitable for telecommunications infrastructure, industrial data acquisition, and medical imaging systems requiring stable component supply across extended production lifecycles.

Supply support for LTC1740CG#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC1740CG#PBF belongs to ADI's legacy Linear Technology precision high-speed ADC product line, designed specifically for applications demanding excellent AC performance, flexible input configuration, and robust operation in both single- and dual-supply environments.

FAQ

What is the operating temperature range for the LTC1740CG#PBF?

The LTC1740CG#PBF is specified for commercial-grade operation from 0°C to +70°C ambient temperature. This range is confirmed by the "C" suffix in the part number and aligns with the Absolute Maximum Ratings table showing TJ_MAX = 125°C and θ_JA = 95°C/W. The device maintains full performance specifications - including INL, DNL, S/(N+D), and SFDR - across this entire range without derating.

Does the LTC1740CG#PBF support single-supply operation with a 5 V rail only?

Yes, the LTC1740CG#PBF fully supports single-supply operation with only a +5 V (VDD) rail and VSS tied to ground. In this configuration, the internal 2.5 V VCM reference provides the required common-mode bias for the differential input, and the SENSE pin can be grounded to select the 4.5 V internal reference for ±2.5 V full-scale input range. All DC and AC specifications remain guaranteed per the datasheet.

How does the SENSE pin configure the reference voltage on the LTC1740CG#PBF?

The SENSE pin on the LTC1740CG#PBF selects the internal reference mode: grounding SENSE sets VREF = 4.500 V (±2.5 V input range); tying SENSE to VREF sets VREF = 2.250 V (±1.25 V input range); connecting SENSE to VDD disables the internal reference amplifier, allowing external voltage drive at VREF. This configuration is implemented via internal resistor dividers and op-amp feedback paths as shown in Figure 2 of the datasheet.

What is the purpose of the OF (overflow) pin on the LTC1740CG#PBF?

The OF pin on the LTC1740CG#PBF is a dedicated hardware flag that goes high when the analog input exceeds the selected full-scale range - specifically when the digital output equals 01111111111111 (positive overflow) or 10000000000000 (negative overflow). This enables immediate, cycle-accurate detection of clipping without requiring software interpretation of the MSB or comparison logic, critical for real-time signal integrity monitoring.

Can the LTC1740CG#PBF interface directly to a 3 V FPGA without level shifters?

Yes, the LTC1740CG#PBF can interface directly to a 3 V FPGA because its digital output drivers use a separate OVDD supply pin (Pin 19) that accepts 2.7 V to 5.25 V. Setting OVDD = 3.0 V configures all D[13:0] and OF outputs to meet 3 V logic thresholds (VOH ≥ 2.3 V, VOL ≤ 0.4 V), eliminating the need for external level-shifting circuitry while maintaining timing integrity and noise immunity.