24-Bit, 15 mW, 109 dB, 128 kSPS/64 kSPS/32 kSPS ADCs

The AD7767/AD7767-1/AD7767-2 are high performance, 24-bit, oversampled SAR analog-to-digital converters (ADCs). The AD7767/AD7767-1/AD7767-2 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 AD7767/AD7767-1/AD7767-2 provide 24-bit resolution. The combination of exceptional SNR, wide dynamic range, and outstanding dc accuracy make the AD7767/AD7767-1/AD7767-2 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 AD7767/AD7767-1/AD7767-2 accurately gather both ac and dc information.

The AD7767/AD7767-1/AD7767-2 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 AD7767 include a SYNC/PD (synchronization/power-down) pin, allowing the synchronization of multiple AD7767 devices. The addition of an SDI pin provides the option of daisy chaining multiple AD7767 devices.

The AD7767/AD7767-1/AD7767-2 operate from a 2.5 V supply using a 5 V reference. The devices operate from −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

* Oversampled successive approximation (SAR) architecture

* High performance ac and dc accuracy, low power

115.5 dB dynamic range, 32 kSPS (AD7767-2)

112.5 dB dynamic range, 64 kSPS (AD7767-1)

109.5 dB dynamic range, 128 kSPS (AD7767)

−118 dB THD

* Exceptionally low power

8.5 mW, 32 kSPS (AD7767-2)

10.5 mW, 64 kSPS (AD7767-1)

15 mW, 128 kSPS (AD7767)

* High dc accuracy

24 bits, no missing codes (NMC)

INL: ±3 ppm (typical), ±7.6 ppm (maximum)