Datasheet AD7766-KGD (Analog Devices)

24-Bit, 8.5 mW, 115 dB, 32 kHz ADC Known Good Die AD7766-2-KGD FEATURES FUNCTIONAL BLOCK DIAGRAM Oversampled successive approximation (SAR) architecture AVDD AGND MCLK DVDD VDRIVE DGND High performance ac and dc accuracy, low power 115.5 dB VREF+ typical dynamic range, 32 kHz output data rate (ODR) VIN+ −112 dB typical total harmonic distortion (THD) SUCCESSIVE DIGITAL FIR FILTER Exceptionally low power APPROXIMATION ADC 8.5 mW, 32 kHz ODR SYNC/PD VIN– SERIAL INTERFACE High dc accuracy REFGND AND CS CONTROL LOGIC 24 bits, no missing codes (NMC) AD7766-2-KGD Integral nonlinearity (INL): ±6 ppm (typical), ±15 ppm
01 -0
(maximum)
806
SCLK DRDY SDO SDI
13
Low temperature drift
Figure 1.
Zero error drift: 15 nV/°C typical Gain error drift: 0.4 ppm/°C typical
The AD7766-2-KGD includes an on-board digital filter (complete
On-chip low-pass FIR filter
with linear phase response) that acts to eliminate out-of-band
Linear phase response
noise by filtering the oversampled input voltage. The oversampled
Pass-band ripple: ±0.005 dB maximum
architecture also reduces front-end antialiasing requirements.
Stop-band attenuation: 100 dB minimum
Other features of the AD7766-2-KGD include a SYNC/PD
2.5 V supply with 1.8 V/2.5 V/3 V/3.6 V logic interface options
(synchronization/power-down) pin that allows synchronizing
Flexible interfacing options
of multiple AD7766-2-KGD devices or that powers down
Synchronization of multiple devices
the AD7766-2-KGD. The addition of an SDI pin provides the
Daisy-chain capability
option of daisy chaining multiple AD7766-2-KGD devices.
Power-down function
The AD7766-2-KGD operates from a 2.5 V supply using a 5 V
Temperature range: −40°C to +105°C
reference. The device operates from −40°C to +105°C.
APPLICATIONS
Additional application and technical information can be found
Low power PCI/USB data acquisition systems
in the AD7766-2 data sheet.
Low power wireless acquisition systems
Known Good Die (KGD): this die is fully guaranteed to data
Vibration analysis
sheet specifications.
Instrumentation High precision medical acquisition RELATED DEVICES GENERAL DESCRIPTION Table 1. 24-Bit ADCs Part No. Description
The AD7766-2-KGD is a high performance, 24-bit, oversampled AD7760 2.5 MSPS, 100 dB dynamic range,1 on-board differential SAR analog-to-digital converter (ADC). The AD7766-2-KGD amp and reference buffer, parallel, variable decimation combines the benefits of a large dynamic range and input AD7762/ 625 kSPS, 109 dB dynamic range,1 on-board differential bandwidth, consuming 8.5 mW power. AD7763 amp and reference buffer, parallel/serial, variable decimation Ideal for ultralow power data acquisition (such as PCI-based AD7764 312 kSPS, 109 dB dynamic range,1 on-board differential and USB-based systems), the AD7766-2-KGD provides 24-bit amp and reference buffer, variable decimation (pin) resolution. The combination of exceptional signal-to-noise ratio AD7765 156 kSPS, 112 dB dynamic range,1 on-board differential (SNR), wide dynamic range, and outstanding dc accuracy make amp and reference buffer, variable decimation (pin) the AD7766-2-KGD ideally suited for measuring small signal AD7767 128 kSPS, 109.5 dB,1 15 mW, 18-bit INL, serial interface changes over a wide dynamic range. This device is particularly AD7767-1 64 kSPS 112.5 dB,1 10.5 mW, 18-bit INL, serial interface suitable for applications where small changes on the input are AD7767-2 32 kSPS, 115.5 dB,1 8.5 mW, 18-bit INL, serial interface measured on larger ac or dc signals. In such an application, the 1 Dynamic range at maximum output data rate. AD7766-2-KGD accurately gathers both ac and dc information.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM RELATED DEVICES TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS Timing Diagrams ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS OUTLINE DIMENSIONS DIE SPECIFICATIONS AND ASSEMBLY RECOMMENDATIONS ORDERING GUIDE