AD7934BRUZ Analog Devices Inc, AD7934BRUZ Datasheet
AD7934BRUZ
Specifications of AD7934BRUZ
Available stocks
Related parts for AD7934BRUZ
AD7934BRUZ Summary of contents
Page 1
FEATURES Throughput rate: 1.5 MSPS Specified for Low power 6 mW maximum at 1.5 MSPS with 3 V supplies 13.5 mW maximum at 1.5 MSPS with 5 V supplies 4 analog input ...
Page 2
AD7933/AD7934 TABLE OF CONTENTS Features .............................................................................................. 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 AD7933 Specifications................................................................. 3 AD7934 Specifications................................................................. 5 Timing Specifications .................................................................. 7 Absolute Maximum Ratings............................................................ 8 ...
Page 3
SPECIFICATIONS AD7933 SPECIFICATIONS 2 5.25 V, internal/external V DD DRIVE unless otherwise noted. MAX Table 2. Parameter DYNAMIC PERFORMANCE 2 Signal-to-Noise + Distortion (SINAD) 2 Total Harmonic Distortion (THD) Peak Harmonic ...
Page 4
AD7933/AD7934 Parameter REFERENCE INPUT/OUTPUT 5 V Input Voltage REF 4 DC Leakage Current V Output Voltage REFOUT V Temperature Coefficient REFOUT V Noise REF V Output Impedance REF V Input Capacitance REF LOGIC INPUTS Input High Voltage, V INH Input ...
Page 5
AD7934 SPECIFICATIONS 2 5.25 V, internal/external V DD DRIVE unless otherwise noted. A MIN MAX Table 3. Parameter DYNAMIC PERFORMANCE 2 Signal-to-Noise + Distortion (SINAD) 2 Signal-to-Noise Ratio ...
Page 6
AD7933/AD7934 Parameter REFERENCE INPUT/OUTPUT 5 V Input Voltage REF DC Leakage Current V Output Voltage REFOUT V Temperature Coefficient REFOUT V Noise REF V Output Impedance REF V Input Capacitance REF LOGIC INPUTS Input High Voltage, V INH Input Low ...
Page 7
TIMING SPECIFICATIONS 2 5.25 V, internal/external V DD DRIVE unless otherwise noted. A MIN MAX Table 4. Limit MIN MAX 1 Parameter AD7933 AD7934 ...
Page 8
AD7933/AD7934 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 5. Parameter V to AGND/DGND AGND/DGND DRIVE Analog Input Voltage to AGND Digital Input Voltage to DGND DRIVE DD Digital Output Voltage ...
Page 9
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 6. Pin Function Descriptions Pin No. Mnemonic Description 1 V Power Supply Input. The V DD with a 0.1 μF capacitor and a 10 μF tantalum capacitor. 2 W/B Word/Byte Input. When this input ...
Page 10
AD7933/AD7934 Pin No. Mnemonic Description 20 WR Write Input. Active low logic input used in conjunction with CS to write data to the control register Read Input. Active low logic input used in conjunction with CS to access ...
Page 11
TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, unless otherwise noted. A –60 100mV p-p SINE WAVE ON V AND/ DECOUPLING DIFFERENTIAL/SINGLE-ENDED MODE –70 INT REF –80 –90 EXT REF –100 –110 –120 10 210 410 SUPPLY RIPPLE FREQUENCY ...
Page 12
AD7933/AD7934 4 SINGLE-ENDED MODE POSITIVE DNL 0 NEGATIVE DNL –1 0.25 0.50 0.75 1.00 1.25 1.50 V (V) REF Figure 9. AD7934 DNL vs. V REF DIFFERENTIAL MODE 10 SINGLE-ENDED MODE ...
Page 13
TERMINOLOGY Integral Nonlinearity (INL) The maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The endpoints of the transfer function are zero scale, 1 LSB below the first code transition, and full scale, 1 ...
Page 14
AD7933/AD7934 Track-and-Hold Acquisition Time The track-and-hold amplifier returns to track mode at the end of conversion. The track-and-hold acquisition time is the time required for the output of the track-and-hold amplifier to reach its final value, within ±½ LSB, after ...
Page 15
CONTROL REGISTER The control register on the AD7933/AD7934 is a 12-bit, write- only register. Data is written to this register using the CS and WR pins. The functions of the control register bits are described in Table 8. At power-up, ...
Page 16
AD7933/AD7934 SEQUENCER OPERATION The configuration of the SEQ0 and SEQ1 bits in the control register allows use of the sequencer function. Table 11 outlines the two sequencer modes of operation. Writing to the Control Register to Program the Sequencer The ...
Page 17
CIRCUIT INFORMATION The AD7933/AD7934 are fast, 4-channel, 10-bit and 12-bit, single-supply, successive approximation analog-to-digital converters. The parts operate from a 2 5.25 V power supply and feature throughput rates up to 1.5 MSPS. The AD7933/AD7934 provide the user ...
Page 18
AD7933/AD7934 1 LSB = 2 × V /4096 (AD7934) REF 1 LSB = 2 × V /1024 (AD7933) REF 011...111 011...110 000...001 000...000 111...111 100...010 100...001 100...000 – LSB V REF REF Figure 17. AD7933/AD7934 Ideal Transfer Characteristic ...
Page 19
F = 50kHz IN –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 10 100 R (Ω) SOURCE Figure 20. THD vs. Source Impedance in Single-Ended Mode – 50kHz IN –65 –70 –75 –80 –85 V ...
Page 20
AD7933/AD7934 V REF p-p V REF p-p COMMON-MODE VOLTAGE *ADDITIONAL PINS OMITTED FOR CLARITY. Figure 24. Differential Input Definition The amplitude of the differential signal is the difference between the signals applied to the V IN+ differential pair (that is, ...
Page 21
V p-p REF V+ 440Ω GND 27Ω V– 220Ω 220Ω 220Ω V+ 27Ω A V– + 10kΩ 20kΩ Figure 27. Dual Op Amp Circuit to Convert a Single-Ended Bipolar Signal into a Unipolar Differential Signal 220Ω V ...
Page 22
AD7933/AD7934 starts the sequence again. The WR input must be kept high to ensure that the control register is not accidentally overwritten and the sequence interrupted. This pattern continues until the AD7933/AD7934 is written to. Figure 31 shows the flowchart ...
Page 23
PARALLEL INTERFACE The AD7933/AD7934 have a flexible, high speed, parallel interface. This interface is 10 bits (AD7933 bits (AD7934) wide and is capable of operating in either word (W/ B tied high) or byte (W/ B tied low) ...
Page 24
AD7933/AD7934 Reading Data from the AD7933/AD7934 With the W/ B pin tied logic high, the AD7933/AD7934 interface operates in word mode. In this case, a single read operation from the device accesses the conversion data-word on Pin DB0 to Pin ...
Page 25
Writing Data to the AD7933/AD7934 With W/ B tied logic high, a single write operation transfers the full data-word on DB0 to DB11 to the control register on the AD7933/AD7934. The DB8/HBEN pin assumes its DB8 function. Data written to ...
Page 26
AD7933/AD7934 POWER MODES OF OPERATION The AD7933/AD7934 have four different power modes of operation. These modes are designed to provide flexible power management options. Different options can be chosen to optimize the power dissipation/throughput rate ratio for differing applica- tions. ...
Page 27
POWER vs. THROUGHPUT RATE A considerable advantage of powering the ADC down after a conversion is that the power consumption of the part is significantly reduced at lower throughput rates. When using the different power modes, the AD7933/AD7934 are only ...
Page 28
AD7933/AD7934 AD7933/AD7934 to ADSP-21065L Interface Figure 42 shows a typical interface between the AD7933/AD7934 and the ADSP-21065L SHARC® processor. This interface is an example of one of three DMA handshake modes. The MS control line is actually three memory select ...
Page 29
APPLICATION HINTS GROUNDING AND LAYOUT Design the printed circuit board that houses the AD7933/AD7934 so that the analog and digital sections are separated and con- fined to certain areas of the board. This facilitates the use of ground planes that ...
Page 30
... AD7934BRU −40°C to +85°C AD7934BRU-REEL –40°C to +85°C AD7934BRU-REEL7 –40°C to +85°C 2 AD7934BRUZ –40°C to +85°C 2 AD7934BRUZ-REEL7 –40°C to +85°C 3 EVAL-AD7933CB 3 EVAL-AD7934CB 4 EVAL-CONTROL-BRD2 1 Linearity error here refers to integral linearity error Pb-free part. ...
Page 31
NOTES Rev Page AD7933/AD7934 ...
Page 32
AD7933/AD7934 NOTES ©2005–2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D03713-0-2/07(B) Rev Page ...