Analog Devices Inc. LTC1740IG#PBF

Overview

LTC1740IG#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 6 Msps pipelined analog-to-digital converter with differential input architecture, ±2.5V full-scale range using internal 4.5V reference, 79 dB S/(N+D) at 2.5 MHz input, and 80 MHz full-power bandwidth - deployed in high-speed spectral analysis and telecommunications data acquisition systems.

For engineers reviewing the LTC1740IG#PBF datasheet, LTC1740IG#PBF pinout, LTC1740IG#PBF application, or LTC1740IG#PBF equivalent, key selection criteria include guaranteed no missing codes over temperature, 75 dB common-mode rejection for ground-loop mitigation, dual ±5V or single 5V supply operation, and 3V–5V output logic compatibility via OVDD pin.

Technical Context

The LTC1740IG#PBF implements a fully differential sample-and-hold front-end followed by a 14-bit pipelined CMOS ADC core with digital correction logic. Its timing architecture features fixed 100 ns conversion time and 3-cycle pipeline latency, where output data becomes valid on the third rising CLK edge after sampling.

It supports flexible reference configuration: SENSE pin selects between 4.5 V (±2.5 V input range), 2.25 V (±1.25 V), or external reference drive mode. Input common-mode voltage is arbitrary within supply rails, and VCM pin provides a buffered 2.5 V reference for single-supply biasing.

Key Specifications

Pinout & Package

Package: 36-lead plastic SSOP (0.209-inch width), RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9240ASTZ-80 and MAX1186ECM+, the LTC1740IG#PBF uniquely balances 6 Msps throughput, integrated reference flexibility, and 3V–5V logic compatibility - making it optimal for cost-sensitive, space-constrained industrial and telecom boards requiring minimal support components.

Availability

LTC1740IG#PBF is available at Aetrix Electronics and suitable for telecommunications baseband digitization, multiplexed industrial data acquisition, and high-speed spectral analysis requiring stable component supply across extended temperature ranges.

Supply support for LTC1740IG#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 LTC1740IG#PBF belongs to ADI's legacy Linear Technology high-speed precision ADC product line, designed specifically for applications demanding wide bandwidth, excellent AC performance, and simplified analog front-end integration in compact PCB layouts.

FAQ

What is the operating temperature range for the LTC1740IG#PBF?

The LTC1740IG#PBF is specified for industrial operation from –40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table and applies to all guaranteed specifications including INL, DNL, S/(N+D), and SFDR. The "I" suffix explicitly denotes this extended temperature grade, distinguishing it from the commercial-grade LTC1740CG (0°C to 70°C). Thermal derating is not required within this range.

Does the LTC1740IG#PBF require an external clock driver for optimal performance?

Yes - for best AC performance, the LTC1740IG#PBF requires a low-jitter clock source with ≤5 ns rise time. The datasheet specifies that aperture jitter contributes directly to SNR degradation via SNR = –20log(2πf_INt_J). A crystal oscillator or low-phase-noise PLL is recommended; logic gates may be used to sharpen slower clocks. The LTC1740IG#PBF itself does not include an on-chip PLL or clock conditioner.

Can the LTC1740IG#PBF operate from a single 3.3 V supply?

No - the LTC1740IG#PBF requires either a single 5 V analog supply (VDD = 5 V, VSS = 0 V) or dual ±5 V supplies (VDD = +5 V, VSS = –5 V). While OVDD supports 2.7 V to 5.25 V for digital output interfacing, the analog core mandates 5 V operation. Attempting 3.3 V on VDD violates Absolute Maximum Ratings and will result in undefined conversion behavior or damage.

How is the overflow flag (OF) used in real-time signal processing with the LTC1740IG#PBF?

The OF pin on the LTC1740IG#PBF asserts high when the input exceeds ±VREF/1.8 - corresponding to output codes 01111111111111 or 10000000000000. In real-time systems, OF can trigger hardware interrupts or feed back to AGC circuitry to adjust VREF via DAC (as shown in Figure 3b), enabling adaptive full-scale optimization without CPU intervention. It is asynchronous to CLK and valid immediately upon overflow detection.

Is the LTC1740IG#PBF pin-compatible with other members of the LTC1740 family?

Yes - all LTC1740 variants (including LTC1740CG, LTC1740IG, and LTC1740HG) share identical 36-pin SSOP packaging and pinout. The only differences are temperature grade (C/I/H) and associated screening/test limits. No PCB redesign is needed when upgrading from CG to IG grade, and all electrical interface requirements (bypassing, grounding, timing) remain unchanged.