Catalog
24-Bit, 15 mW, 109 dB, 128 kSPS/64 kSPS/32 kSPS ADCs
Key Features
• Oversampled successive approximation (SAR) architecture
• High performance ac and dc accuracy, low power115.5 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 power8.5 mW, 32 kSPS (AD7767-2)10.5 mW, 64 kSPS (AD7767-1)15 mW, 128 kSPS (AD7767)
• High dc accuracy24 bits, no missing codes (NMC)INL: ±3 ppm (typical), ±7.6 ppm (maximum)
• Low temperature driftZero error drift: 15 nV/°CGain error drift: 0.4 ppm/°C
• On-chip low-pass FIR filter
• 2.5 V supply with 1.8 V/2.5 V/3 V/3.6 V logic interface options
• Flexible interfacing optionsSynchronization of multiple devicesDaisy-chain capabilityPower-down function
• Temperature range: −40°C to +105°C
Description
AI
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 aSYNC/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.ApplicationsLow power PCI/USB data acquisition systemsLow power wireless acquisition systemsVibration analysisInstrumentationHigh precision medical acquisition
