EVAL-AD7766-1EDZ Analog Devices Inc, EVAL-AD7766-1EDZ Datasheet

EVAL-AD7766-1EDZ

Manufacturer Part Number

EVAL-AD7766-1EDZ

Description

BOARD EVAL AD7766-1 64KSPS 111DB

Manufacturer

Analog Devices Inc

Datasheets

1.AD7766BRUZ-2.pdf (24 pages)

2.EVAL-AD7766-1EDZ.pdf (24 pages)

Specifications of EVAL-AD7766-1EDZ

Number Of Adc's

Number Of Bits

Sampling Rate (per Second)

64k

Data Interface

Serial

Inputs Per Adc

1 Differential

Input Range

±VREF

Power (typ) @ Conditions

10.5mW @ 64kSPS

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 105°C

Utilized Ic / Part

AD7766-1

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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FEATURES

Oversampled successive approximation (SAR) architecture

High performance ac and dc accuracy, low power

Exceptionally low power

High dc accuracy

Low temperature drift

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 options

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

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Power-down function

REFGND

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

8.5 mW, 32 kSPS (AD7766-2)

10.5 mW, 64 kSPS (AD7766-1)

15 mW, 128 kSPS (AD7766)

24 bits, no missing codes (NMC)

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

Zero error drift: 15 nV/°C

Gain error drift: 0.4 ppm/°C

Linear phase response

Pass-band ripple: ±0.005 dB

Stop-band attenuation: 100 dB

Synchronization of multiple devices

Daisy-chain capability

REF+

IN+

IN–

FUNCTIONAL BLOCK DIAGRAM

AD7766/

AD7766-1/

AD7766-2

APPROXIMATION

SUCCESSIVE

AGND MCLK

ADC

Figure 1.

SCLK DRDY SDO

SERIAL INTERFACE

CONTROL LOGIC

FIR FILTER

DIGITAL

DRIVE

AND

DGND

SDI

SYNC/PD

128 kSPS/64 kSPS/32 kSPS ADCs

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

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.

AD7760

AD7762/

AD7763

AD7764

AD7765

AD7767

AD7767-1

AD7767-2

Dynamic range at maximum output data rate.

Description

2.5 MSPS, 100 dB dynamic range,

amp and reference buffer, parallel, variable decimation

625 kSPS, 109 dB dynamic range,

amp and reference buffer, parallel/serial, variable

decimation

312 kSPS, 109 dB dynamic range,

amp and reference buffer, variable decimation (pin)

156 kSPS, 112 dB dynamic range,

amp and reference buffer, variable decimation (pin)

128 kSPS, 109.5 dB,

64 kSPS 112.5 dB,

32 kSPS, 115.5 dB,

24-Bit, 8.5 mW, 109 dB,

10.5 mW, 18-bit INL, serial interface

8.5 mW, 18-bit INL, serial interface

15 mW, 18-bit INL, serial interface

on-board differential

AD7766

www.analog.com

Related parts for EVAL-AD7766-1EDZ

EVAL-AD7766-1EDZ Summary of contents

Page 1

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 ...

Page 2

AD7766 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Related Devices ................................................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Specifications .................................................................. 5 Timing Diagrams .......................................................................... 6 Absolute Maximum ...

Page 3

SPECIFICATIONS 2.5 V ± DRIVE unless otherwise noted. Table 2. Parameter OUTPUT DATA RATE (ODR) AD7766 AD7766-1 AD7766-2 1 ANALOG INPUT Differential Input Voltage Absolute ...

Page 4

AD7766 Parameter 1 DIGITAL FILTER RESPONSE Group Delay Settling Time (Latency) Pass-Band Ripple Pass Band −3 dB Bandwidth Stop-Band Frequency Stop-Band Attenuation REFERENCE INPUT 1 V Input Voltage REF+ 1 DIGITAL INPUTS (Logic Levels Input Leakage ...

Page 5

TIMING SPECIFICATIONS 2.5 V ± DRIVE 1 unless otherwise noted. Table 3. Parameter Limit at t DRDY OPERATION t 510 100 2 ...

Page 6

AD7766 TIMING DIAGRAMS 1 MCLK t 1 DRDY Figure 2. DRDY vs. MCLK Timing Diagram for AD7766 (Decimate by 8 for AD7766-1 (Decimate by 16 for AD7766-2 (Decimate by 32) DRDY ...

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PART IN POWER-DOWN MCLK ( SYNC/PD ( DRDY (O) VALID DATA SDO (O) Figure 5. Reset, Synchronization, and Power-Down Timing (For More Information, See the Power-Down, Reset, and Synchronization Section) PART OUT OF POWER-DOWN FILTER ...

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AD7766 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter AV to AGND DGND REFGND REF+ REFGND to AGND V to DGND DRIVE V V ...

Page 9

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 AV +2.5 V Analog Power Supply Reference Input for the AD7766/AD7766-1/AD7766-2. An external reference must be applied to this input pin. The ...

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AD7766 TYPICAL PERFORMANCE CHARACTERISTICS 2.5 V ± DRIVE otherwise noted. All FFTs were generated using 8192 samples using a four-term Blackman-Harris window. 0 –20 –40 ...

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FREQUENCY (Hz) Figure 13. AD7766 FFT, 1 kHz, −60 dB Input Tone 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 0 ...

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AD7766 –104 –108 AD7766-2 –112 AD7766-1 AD7766 –116 –120 0 100k 200k 300k 400k 500k 600k MCLK FREQUENCY (Hz) Figure 19. AD7766/AD7766-1/AD7766-2 THD vs. MCLK Frequency 115 114 AD7766-2 113 112 111 AD7766-1 110 109 AD7766 108 107 0 100k ...

Page 13

MAX = 8,388,593 350 MIN = 8,388,526 SPREAD = 69 CODES 300 250 200 150 100 50 0 CODES Figure 25. AD7766-2 24-Bit Histogram 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 4,194,304 8,388,608 12,582,912 2,097,152 ...

Page 14

AD7766 TERMINOLOGY Signal-to-Noise Ratio (SNR) SNR is the ratio of the actual input signal’s rms value to the rms sum of all other spectral components below the Nyquist frequency, excluding harmonics and dc. The value for SNR is expressed in ...

Page 15

THEORY OF OPERATION The AD7766/AD7766-1/AD7766-2 operate using a fully differential analog input applied to a successive approximation (SAR) core. The output of the oversampled SAR is filtered using a linear-phase digital FIR filter. The fully filtered data is output in ...

Page 16

AD7766 0 –20 –40 –60 –80 –100 –120 –140 –160 0 16k 32k 48k 64k 80k FREQUENCY (Hz) Figure 32. AD7766 Digital Filter Frequency Response 0 –20 –40 –60 –80 –100 –120 –140 –160 0 8k 16k 24k 32k 40k ...

Page 17

AD7766/AD7766-1/AD77662-2 INTERFACE The AD7766/AD7766-1/AD7766-2 provide the user with a flexible serial interface, enabling the user to implement the most desirable interfacing scheme for their application. Each AD7766/AD7766-1/AD7766-2 interface comprises seven different signals. Five of these signals are inputs: MCLK, CS ...

Page 18

AD7766 DAISY CHAINING Daisy chaining devices allows numerous devices to use the same digital interface lines by cascading the outputs of multiple ADCs on a single data line. This feature is especially useful for reduc- ing component count and wiring ...

Page 19

DAISY-CHAIN MODE CONFIGURATION AND TIMING DIAGRAMS SYNC/PD CS SYNC/PD CS AD7766 (D) SDI SDI SCLK MCLK SCLK MCLK 1 MCLK DRDY ( × SCLK SCLK AD7766 (A) SDO (A) SDI (A) = SDO (B) AD7766 (B) AD7766 ...

Page 20

AD7766 DRIVING THE AD7766/AD7766-1/AD7766-2 The AD7766/AD7766-1/AD7766-2 must be driven with fully differential inputs. The common-mode voltage of the differential inputs to the AD7766/AD7766-1/AD7766-2 devices, and therefore the limits on the differential inputs, is set by the reference voltage (V ) ...

Page 21

ANTIALIASING The AD7766/AD7766-1/AD7766-2 sample the analog input at a maximum rate of 1.024 MHz. The on-board digital filter provides up to 100 dB attenuation for any possible aliasing frequency in the range from the beginning of the filter stop band ...

Page 22

AD7766 V INPUT SIGNAL REF+ The AD7766/AD7766-1/AD7766-2 V REF + voltage in the range of 2 × recommended that the V input be generated by a low noise REF+ voltage reference. Examples of such references ...

Page 23

... AD7766BRUZ-RL7 −40°C to +105°C AD7766BRUZ-1 −40°C to +105°C AD7766BRUZ-1-RL7 −40°C to +105°C AD7766BRUZ-2 −40°C to +105°C AD7766BRUZ-2-RL7 −40°C to +105°C EVAL-AD7766EDZ EVAL-AD7766-1EDZ EVAL-AD7766-2EDZ EVAL-CED1Z RoHS Compliant Part. 5.10 5.00 4. 4.50 6.40 4.40 BSC 4 ...

Page 24

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