Analog Devices Inc. LTC1408CUH#TRPBF

Overview

LTC1408CUH#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 6-channel simultaneous-sampling analog-to-digital converter with 600ksps aggregate throughput and 100ksps per channel. It operates from a single 3V supply, draws only 5mA active current, features 90dB common-mode rejection, and uses a 5mm × 5mm 32-pin QFN package - optimized for multiphase power monitoring and motor control in portable industrial systems.

For engineers reviewing the LTC1408CUH#TRPBF datasheet, LTC1408CUH#TRPBF pinout, LTC1408CUH#TRPBF application, or LTC1408CUH#TRPBF equivalent, key selection criteria include simultaneous differential sampling capability, 76dB SINAD at 100kHz, SLEEP mode (6µW), BIP/UNIPOLAR input range selection, and 3-wire serial interface timing compliance.

Technical Context

The LTC1408CUH#TRPBF implements six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, enabling true simultaneous acquisition across all channels. Conversion proceeds at 100ksps per channel using a successive-approximation architecture with internal 2.5V bandgap reference.

Input configuration is controlled via the BIP pin (0V–2.5V unipolar or ±1.25V bipolar differential), while channel count is programmable via SEL2/SEL1/SEL0 (1–6 channels). Output data is serialized MSB-first over SDO using a 96-clock frame for full 6-channel reads, compatible with standard SPI-like interfaces.

Key Specifications

Pinout & Package

Package: 32-pin plastic QFN (5mm × 5mm), exposed pad (Pin 33) soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.

Compared with ADS8588SIPM and AD7606C-16BSTZ, the LTC1408CUH#TRPBF offers the smallest footprint (5mm × 5mm QFN), lowest active power (15mW), and simplest 3-wire interface - making it optimal for space- and energy-constrained portable instrumentation where 14-bit fidelity suffices.

Availability

LTC1408CUH#TRPBF is available at Aetrix Electronics and suitable for multiphase power measurement, motor control systems, and portable data acquisition requiring stable component supply and long-term manufacturability.

Supply support for LTC1408CUH#TRPBF 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 acquired Linear Technology in 2017 and maintains its high-performance analog portfolio, emphasizing precision signal conditioning and power management ICs for industrial, automotive, and communications markets.

The LTC1408CUH#TRPBF belongs to Linear's precision simultaneous-sampling ADC family, designed specifically for vector-controlled motor drives and power quality analyzers demanding synchronized multi-channel acquisition with ultra-low power and small form factor.

FAQ

What is the operating temperature range for the LTC1408CUH#TRPBF?

The LTC1408CUH#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). This range is specified in the Absolute Maximum Ratings table and applies to all key parameters including INL, offset error, and SINAD - ensuring reliable performance in indoor industrial and portable equipment environments.

How does the BIP pin affect output data formatting in the LTC1408CUH#TRPBF?

When BIP = LOW, the LTC1408CUH#TRPBF outputs straight binary codes for 0V–2.5V unipolar inputs. When BIP = HIGH, it outputs 2's complement codes for ±1.25V bipolar inputs. The BIP state must be held constant during conversion and readout; changing it mid-sequence invalidates prior data alignment.

Can the LTC1408CUH#TRPBF interface directly with a 1.8V logic system?

Yes - the LTC1408CUH#TRPBF supports mixed-voltage operation via OVDD (Pin 3), which powers the SDO output driver. Setting OVDD = 1.8V enables direct connection to 1.8V logic families while maintaining VDD = 3V for internal circuitry, with OVDD allowed up to 300mV above VDD.

What is the minimum acquisition time required for full 600ksps throughput on the LTC1408CUH#TRPBF?

The LTC1408CUH#TRPBF requires 39ns sample-and-hold acquisition time (tACQ) to achieve full 600ksps aggregate throughput. This value is guaranteed over temperature and applies when driving inputs with ≤100Ω source impedance; higher impedances increase required acquisition time proportionally.

Does the LTC1408CUH#TRPBF support external reference voltage sources?

Yes - the LTC1408CUH#TRPBF allows overdriving its internal 2.5V reference via the VREF pin with an external reference between 2.55V and VDD. External references improve accuracy and temperature stability, especially when using precision references like the LT6655, and maintain full 14-bit performance.