EVAL-AD7766EDZ Analog Devices Inc, EVAL-AD7766EDZ Datasheet
EVAL-AD7766EDZ
Specifications of EVAL-AD7766EDZ
Related parts for EVAL-AD7766EDZ
EVAL-AD7766EDZ 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 ...
Page 7
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 ...
Page 8
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 ...
Page 10
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 ...
Page 11
FREQUENCY (Hz) Figure 13. AD7766 FFT, 1 kHz, −60 dB Input Tone 0 –20 –40 –60 –80 –100 –120 –140 –160 –180 0 ...
Page 12
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 −40°C to +105°C 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 ...
Page 24
AD7766 NOTES ©2007–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06449-0-4/10(C) Rev Page ...