1FEATURES

2? AC Performance:

103dB of Dynamic Range at 4MSPS

111dB of Dynamic Range at 125kSPS

–107dB THD

? DC Accuracy:

3ppm INL

4mV/°C Offset Drift

4ppm/°C Gain Drift

? Programmable Digital Filter with

User-Selectable Path:

– Low-Latency: Completely settles in 2.65ms

– Wide-Bandwidth: 1.7MHz BW with flat

passband

? Flexible Read-Only Serial Interface:

– Standard CMOS

– Serialized LVDS

? Easy Conversion Control with START Pin

? Out-of-Range Detection

? Supply: Analog +5V, Digital +3V

? Power: 575mW

APPLICATIONS

? Automated Test Equipment

? Medical Imaging

? Scientific Instrumentation

? Test and Measurement

DESCRIPTION

The ADS1675 is a high-speed, high-precision

analog-to-digital converter (ADC). Using an advanced

delta-sigma (ΔΣ) architecture, it operates at speeds

up to 4MSPS with outstanding ac performance and

dc accuracy.

The ADS1675 ADC is comprised of a low-drift

modulator with out-of-range detection and a dual-path

programmable digital filter. The dual filter path allows

the user to select between two post-processing filters:

Low-Latency or Wide-Bandwidth. The Low-Latency filter settles quickly (as fast as 2.65ms) for

applications with large instantaneous changes, such

as a multiplexer. The Wide-Bandwidth path provides

an optimized frequency response for ac

measurements with a passband ripple of less than ±0.00002dB, stop band attenuation of 86dB, and a

bandwidth of 1.7MHz.

The device offers two speed modes with distinct

interface, resolution, and feature set. In the

high-speed mode the device can be set to operate at

either 4MSPS or 2MSPS. In the low-speed mode, it can be set to operate at either 1MSPS, 500KSPS,

250KSPS or 125KSPS.

The ADS1675 is controlled through I/O pins—there are no registers to program. A dedicated START pin

allows for direct control of conversions: toggle the

START pin to begin a conversion, and then retrieve

the output data. The flexible serial interface supports

data readback with either standard CMOS and LVDS

logic levels, allowing the ADS1675 to directly connect

to a wide range of microcontrollers, digital signal

processors (DSPs), or field-programmable grid arrays

(FPGAs).

The ADS1675 operates from an analog supply of 5V

and digital supply of 3V, and dissipates 575mW of

power. When not in use, the PDWN pin can be used

to power down all device circuitry. The device is fully

specified over the industrial temperature range and is

offered in a TQFP-64 package.