Pseudo Differential Input, 1 MSPS/500 kSPS,

Dual, Simultaneous Sampling, 16-Bit, SAR ADCs

Data Sheet

AD4682/AD4683

Rev. 0

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FEATURES

Dual 16-bit ADC family

Dual simultaneous sampling

Pseudo differential analog inputs

Throughput conversion rate

1 MSPS for the AD4682

500 kSPS for the AD4683

SNR (typical)

93.4 dB with RES = 1 and OSR = ×8

On-chip oversampling function

Alert function

Resolution boost function

INL error (maximum): 2.5 LSBs

2.5 V internal reference

High speed serial interface

−40°C to +125°C operation

3 mm × 3 mm, 16-lead LFCSP

APPLICATIONS

Motor control position feedback

Motor control current sense

Sonar

Power quality

Data acquisition systems

Erbium doped fiber amplifier (EDFA) applications

Inphase (I) and quadrature (Q) demodulation

GENERAL DESCRIPTION

The AD4682 and the AD4683 are a 16-bit, pin-compatible family

of dual, simultaneous sampling, high speed, low power, successive

approximation register (SAR), analog-to-digital converters (ADCs)

that operate from a 3.0 V to 3.6 V power supply and feature

throughput rates up to 1 MSPS for the AD4682 and 500 kSPS

for the AD4683. The analog input type is pseudo differential

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

Integrated on-chip oversampling blocks improve dynamic range

and reduce noise at lower bandwidths. A buffered internal 2.5 V

reference is included. Alternatively, an external reference up to

3.3 V can be used.

The conversion process and data acquisition use standard control

inputs that allow simple interfacing to microprocessors or digital

signal processors (DSPs). The devices are compatible with

1.8 V, 2.5 V, and 3.3 V interfaces, using a separate logic supply.

COMPANION PARTS

ADC Drivers: ADA4896-2, ADA4940-2, ADA4807-2, LTC6227

Voltage References: ADR4533 (3.3 V), ADR4525 (2.5 V)

Low Dropout Regulators: ADP166, ADP7104, ADP7182

Additional companion products on the AD4682 and AD4683

product pages

Table 1. Related Devices in the Family

Input Type

16-Bit

14-Bit

12-Bit

Differential

AD7380

AD7381

Pseudo Differential

AD7383

AD7384

Single-Ended

AD7386

AD7387

AD7388

FUNCTIONAL BLOCK DIAGRAM

ADC A

SDOA

DIGITAL

CONTROLLER

AD4682/AD4683

SCLK

1µF

3.3V

1µF

3.3V

GND

SDI

CS

SDOB/ALERT

REFIO

REFCAP

GND

REGCAP

OVER-

SAMPLING

ADC B

OVER-

SAMPLING

OSC

REF

LDO

CONTROL

LOGIC

R

0V

C1

C1

0V

(

(

R

Figure 1.