24-Bit, 8.5 mW, 109 dB,

128 kSPS/64 kSPS/32 kSPS ADCs

AD7766

Rev. C

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FEATURES

Oversampled successive approximation (SAR) architecture

High performance ac and dc accuracy, low power

115.5 dB dynamic range, 32 kSPS (AD7766-2)

112.5 dB dynamic range, 64 kSPS (AD7766-1)

109.5 dB dynamic range, 128 kSPS (AD7766)

−112 dB THD

Exceptionally low power

8.5 mW, 32 kSPS (AD7766-2)

10.5 mW, 64 kSPS (AD7766-1)

15 mW, 128 kSPS (AD7766)

High dc accuracy

24 bits, no missing codes (NMC)

INL: ±6 ppm (typical), ±15 ppm (maximum)

Low temperature drift

Zero error drift: 15 nV/°C

Gain error drift: 0.4 ppm/°C

On-chip low-pass FIR filter

Linear phase response

Pass-band ripple: ±0.005 dB

Stop-band attenuation: 100 dB

2.5 V supply with 1.8 V/2.5 V/3 V/3.6 V logic interface options

Flexible interfacing options

Synchronization of multiple devices

Daisy-chain capability

Power-down function

Temperature range: −40°C to +105°C

APPLICATIONS

Low power PCI/USB data acquisition systems

Low power wireless acquisition systems

Vibration analysis

Instrumentation

High precision medical acquisition

FUNCTIONAL BLOCK DIAGRAM

REFGND

SUCCESSIVE

APPROXIMATION

ADC

DIGITAL

FIR FILTER

SERIAL INTERFACE

AND

CONTROL LOGIC

SCLK DRDY SDO

SDI

AD7766/

AD7766-1/

AD7766-2

CS

SYNC/PD

Figure 1.

GENERAL DESCRIPTION

The AD7766/AD7766-1/AD7766-2 are high performance,

24-bit, oversampled SAR analog-to-digital converters (ADCs).

The AD7766/AD7766-1/AD7766-2 combine the benefits of a

large dynamic range and input bandwidth, consuming 15 mW,

10.5 mW, and 8.5 mW power, respectively, and are contained in

a 16-lead TSSOP package.

Ideal for ultralow power data acquisition (such as PCI- and USB-

based systems), the AD7766/AD7766-1/AD7766-2 provide 24-bit

resolution. The combination of exceptional SNR, wide dynamic

range, and outstanding dc accuracy make the AD7766/AD7766-1/

AD7766-2 ideally suited for measuring small signal changes over a

wide dynamic range. This is particularly suitable for applications

where small changes on the input are measured on larger ac or

dc signals. In such an application, the AD7766/AD7766-1/

AD7766-2 accurately gather both ac and dc information.

The AD7766/AD7766-1/AD7766-2 include an on-board digital

filter (complete with linear phase response) that acts to elimi-

nate out-of-band noise by filtering the oversampled input voltage.

The oversampled architecture also reduces front-end antialias

requirements. Other features of the AD7766/AD7766-1/AD7766-2

include a SYNC/PD (synchronization/power-down) pin, allowing

the synchronization of multiple AD7766/AD7766-1/AD7766-2

devices. The addition of an SDI pin provides the option of daisy

chaining multiple AD7766/AD7766-1/AD7766-2 devices.

The AD7766/AD7766-1/AD7766-2 operate from a 2.5 V supply

using a 5 V reference. The devices operate from −40°C to +105°C.

RELATED DEVICES

Table 1. 24-Bit ADCs

Part No.

Description

AD7760

2.5 MSPS, 100 dB dynamic range,1 on-board differential

amp and reference buffer, parallel, variable decimation

AD7762/

AD7763

625 kSPS, 109 dB dynamic range,1 on-board differential

amp and reference buffer, parallel/serial, variable

decimation

AD7764

312 kSPS, 109 dB dynamic range,1 on-board differential

amp and reference buffer, variable decimation (pin)

AD7765

156 kSPS, 112 dB dynamic range,1 on-board differential

amp and reference buffer, variable decimation (pin)

AD7767

128 kSPS, 109.5 dB,1 15 mW, 18-bit INL, serial interface

AD7767-1

64 kSPS 112.5 dB,1 10.5 mW, 18-bit INL, serial interface

AD7767-2

32 kSPS, 115.5 dB,1 8.5 mW, 18-bit INL, serial interface