AD7766_15 Datasheet, PDF (1/25 Pages) Analog Devices – 24-Bit, 8.5 mW, 109 dB, 128 kSPS/64 kSPS/32 kSPS ADCs

24-Bit, 8.5 mW, 109 dB,
128 kSPS/64 kSPS/32 kSPS ADCs
AD7766
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
AV_DD AGND MCLK DV_DD V_DRIVE DGND
V_REF+
V_IN+
V_IN–
REFGND
SUCCESSIVE
APPROXIMATION
ADC
DIGITAL
FIR FILTER
AD7766/
AD7766-1/
AD7766-2
SERIAL INTERFACE
AND
CONTROL LOGIC
SCLK DRDY SDO SDI
Figure 1.
SYNC/PD
CS
Rev. C
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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
1 _{Dynamic range at maximum output data rate.}
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