Differential Input, Quad, External Reference

Simultaneous Sampling, 16-Bit, SAR ADC

Data Sheet

AD7380-4

Rev. 0

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FEATURES

16-bit ADC family

Quad simultaneous sampling

Fully differential analog inputs

High throughput rate: 4 MSPS

On-chip oversampling function

SNR: 97.7 dB (typical) with OSR = 8×, RES = 1

2-bit resolution boost

Out of range indicator (ALERT)

INL: 3 LSBs (maximum)

High-speed serial interface

Temperature range: −40°C to +125°C

4 mm × 4 mm, 24-lead LFCSP

APPLICATIONS

Motor control position feedback

Motor control current sense

Data acquisition systems

Erbium doped fiber amplifier (EDFA) applications

In phase and quadrature demodulation

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The AD7380-4 is a 16-bit compatible, quad, simultaneous

sampling, high speed, successive approximation register (SAR),

analog-to-digital converters (ADC) operating from a 3.3 V

power supply with throughput rates up to 4 MSPS. The

differential analog input accepts a wide common-mode input

voltage and is sampled and converted on the falling edge of CS.

The AD7380-4 has on-chip oversampling blocks to improve

dynamic range and reduce noise at lower bandwidths. The

oversampling can boost up to two bits of added resolution. The

REFIN pin can have a reference voltage of 2.5 V to 3.3 V.

The conversion process and data acquisition use standard

control inputs allowing easy interfacing to microprocessors or

digital signal processors (DSPs). The conversion result can

clock out simultaneously via 4-wire mode for faster throughput

or via 1-wire serial mode when slower throughput is allowed.

The device is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces

using the separate logic supply.

The AD7380-4 is available in a 24-lead lead frame chip scale

package (LFCSP) and operates over a temperature range of −40°C

to +125°C.

Table 1. Related Devices

No. of

Channels

Input Type

16 Bits

14 Bits

12 Bits

4

Differential

AD7380-4

AD7381-4

AD7389-4

2

Differential

AD7380

AD7381

AD4680

AD4681

Single-ended

AD7386

AD7387

AD7388

PRODUCT HIGHLIGHTS

1. Quad simultaneous sampling and conversion

2. Pin-compatible product family.

3. High throughput rate, 4 MSPS at 16-bit.

4. Space-saving, 4 mm × 4 mm LFCSP.

5. Integrated oversampling block to increase dynamic range,

reduce noise and reduce SCLK speed requirements.

6. Differential analog inputs with wide common-mode range.

7. Small sampling capacitor reduces amplifier drive burden.