Analog Devices Inc. LTC1603CG#PBF

Overview

LTC1603CG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive-approximation analog-to-digital converter with true differential inputs, ±2.5V bipolar input range, 90dB S/(N+D), and –100dB THD at 5kHz - deployed in high-speed data acquisition systems requiring precision timing and low-noise signal capture.

For engineers reviewing the LTC1603CG#PBF datasheet, LTC1603CG#PBF pinout, LTC1603CG#PBF application, or LTC1603CG#PBF equivalent, key selection criteria include its no-pipeline-delay parallel interface, dual shutdown modes (7mW Nap / 10µW Sleep), internal 2.5V reference with 15ppm/°C tempco, and 36-pin SSOP package compatibility with LTC1604/LTC1608.

Technical Context

The LTC1603CG#PBF implements a capacitor-based SAR architecture with an integrated differential sample-and-hold front-end, factory-trimmed internal clock (3.3µs typical conversion time), and two-stage power management logic enabling Nap and Sleep modes via SHDN/CS pin combination. Its analog core operates from ±5V supplies, while digital outputs are independently powered via OVDD for 3V/5V system interfacing.

It features a 15MHz small-signal input bandwidth, 68dB common-mode rejection up to 100kHz, and full-scale linearity maintained across 0°C to 70°C - validated by guaranteed no missing codes and ±3 LSB integral nonlinearity over temperature. The 16-bit parallel output delivers two's complement data synchronized to BUSY rising edge with zero pipeline latency.

Key Specifications

Pinout & Package

Package: 36-lead plastic SSOP (G package), 0.209" body width, 0.025" lead pitch, RoHS-compliant, Pb-free (LTC1603CG#PBF designation confirms #PBF suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8556IPM and AD7606BSTZ, the LTC1603CG#PBF delivers superior single-channel speed (250ksps vs. 200–600ksps shared across channels), integrated reference, and true differential input architecture - making it optimal for applications prioritizing timing precision, noise immunity, and minimal BOM count in compact designs.

Availability

LTC1603CG#PBF is available at Aetrix Electronics and suitable for telecommunications infrastructure, digital signal processing front-ends, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC1603CG#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC1603CG#PBF belongs to Linear Technology's precision high-speed data converter product line, designed specifically for applications demanding low-noise, low-distortion digitization with minimal system-level complexity and power consumption.

FAQ

What is the operating temperature range for the LTC1603CG#PBF?

The LTC1603CG#PBF is specified for commercial-grade operation from 0°C to 70°C. This is indicated by the "C" suffix in the part number. The "G" denotes the grade meets all guaranteed specifications across this full temperature range - including integral linearity error (±3 LSB), offset tempco (0.5 ppm/°C), and S/(N+D) performance (90dB minimum). Industrial-grade variant LTC1603IG extends to –40°C to 85°C.

Does the LTC1603CG#PBF require an external clock source?

No, the LTC1603CG#PBF does not require an external clock source. It contains a factory-trimmed internal oscillator that guarantees a maximum conversion time of 3.8µs and a minimum sampling rate of 250ksps across temperature. The internal clock eliminates timing jitter from external sources and simplifies system design - no crystal, PLL, or clock distribution network is needed for basic operation.

How does the LTC1603CG#PBF handle differential versus single-ended inputs?

The LTC1603CG#PBF natively supports both configurations. In differential mode (AIN+ and AIN– driven), it achieves 68dB CMRR and full 16-bit linearity. In single-ended mode (AIN– grounded), it maintains ±2.5V input range on AIN+, with linearity specs unchanged. The sample-and-hold acquires both inputs simultaneously, so common-mode rejection is preserved even with mismatched source impedances - a key advantage over pseudo-differential architectures.

What are the wake-up times from Nap and Sleep modes for the LTC1603CG#PBF?

Wake-up from Nap mode (SHDN low, CS low) takes 200ns - sufficient for burst-mode acquisition in real-time control systems. Wake-up from Sleep mode (SHDN low, CS high) depends on REFCOMP capacitor value; with the recommended 47µF, it is 160ms due to reference circuit settling. The LTC1603CG#PBF must complete this settling before valid conversions resume - critical for applications requiring rapid power cycling.

Can the LTC1603CG#PBF interface directly with a 3.3V microcontroller?

Yes, the LTC1603CG#PBF supports direct 3.3V interface via its dedicated OVDD pin. When OVDD = 3.3V, the D[15:0] outputs and BUSY signal swing between 0V and 3.3V, while digital inputs (CS, CONVST, RD, SHDN) accept 3V logic levels per VIH/VIL specs. This eliminates level shifters - the analog section continues operating from ±5V supplies, preserving dynamic performance independent of digital interface voltage.