AD7328BRUZ Analog Devices Inc, AD7328BRUZ Datasheet
AD7328BRUZ
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AD7328BRUZ Summary of contents
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FEATURES 12-bit plus sign SAR ADC True bipolar input ranges Software-selectable input ranges ±10 V, ±5 V, ±2 + MSPS throughput rate 8 analog input channels with channel sequencer Single-ended, true differential, and pseudo ...
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AD7328 TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Timing Specifications .................................................................. 6 Absolute Maximum Ratings ............................................................ 7 ESD Caution .................................................................................. 7 ...
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SPECIFICATIONS Unless otherwise noted 16 internal/external MHz MSPS, T SCLK S Table 2. 1 Parameter Min DYNAMIC PERFORMANCE Signal-to-Noise Ratio (SNR) 76 72.5 Signal-to-Noise and Distortion ...
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AD7328 1 Parameter Min 2 Differential Nonlinearity 2, 5 Offset Error Offset Error Match Gain Error 2, 5 Gain Error Match 2, 6 Positive Full-Scale Error 2, 6 Positive Full-Scale Error Match Bipolar Zero Code Error ...
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Parameter Min LOGIC INPUTS Input High Voltage, V 2.4 INH Input Low Voltage, V INL Input Current Input Capacitance LOGIC OUTPUTS Output High Voltage DRIVE 0.2 Output Low Voltage ...
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AD7328 TIMING SPECIFICATIONS 16 − −16 Timing specifications apply with load, unless otherwise noted. A MAX MIN ...
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ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted A Table 4. Parameter Rating V to AGND, DGND −0 +16 AGND, DGND +0 −16 ...
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AD7328 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 CS Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7328 and frames the serial data ...
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TYPICAL PERFORMANCE CHARACTERISTICS 0 4096 POINT FFT V CC – 25°C A INT/EXT 2.5V REFERENCE –40 ±10V RANGE F = 50kHz IN SNR = 77.30dB –60 SINAD = 76.85dB THD = –86.96dB SFDR = ...
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AD7328 – ±12V – 25° 1MSPS –60 S ±10V SE – +10V SE –70 ±10V DIFF –75 –80 –85 –90 –95 –100 10 100 ...
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CODE Figure 16. Histogram of Codes, Single-Ended Mode –50 –55 –60 –65 – –75 – ...
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AD7328 – DRIVE ±12V DD SS – 25°C A INTERNAL REFERENCE –60 RANGE = ±10V AND ±2.5V – 2000Ω, ±10V RANGE 1000Ω, ±10V RANGE ...
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TERMINOLOGY Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of ...
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AD7328 Channel-to-Channel Isolation Channel-to-channel isolation is a measure of the level of crosstalk between any two channels measured by applying a full-scale, 100 kHz sine wave signal to all unselected input channels and determining the degree to which ...
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THEORY OF OPERATION CIRCUIT INFORMATION The AD7328 is a fast, 8-channel, 12-bit plus sign, bipolar input, serial ADC. The AD7328 can accept bipolar input ranges that include ±10 V, ±5 V, and ±2 can also accept a 0 ...
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AD7328 COMPARATOR SW1 SW2 AGND Figure 24. ADC Configuration During Conversion Phase, Single-Ended Mode Figure 25 shows the differential configuration during the ac- quisition phase. For the conversion phase, SW3 opens and SW1 ...
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– Figure 30. Equivalent Analog Input Circuit, Differential Mode Care should be taken to ensure that the analog input does not ...
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AD7328 TYPICAL CONNECTION DIAGRAM Figure 32 shows a typical connection diagram for the AD7328. In this configuration, the AGND pin is connected to the analog ground plane of the system, and the DGND pin is connected to the digital ground ...
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RANGE 4 3 ±2.5V RANGE ±10V –1 RANGE –2 ±10V RANGE –3 – – REF –6 ±16. ±12V Figure 35. Common-Mode Range for ...
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AD7328 8 ±5V RANGE ±5V RANGE ±2.5V 6 RANGE ±10V 4 RANGE 2 0 –2 ±10V RANGE – +10V – RANGE 2.5V REF –8 ±16. ±12V Figure ...
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REGISTERS The AD7328 has four programmable registers: the control register, sequence register, Range Register 1, and Range Register 2. These registers are write-only registers. ADDRESSING REGISTERS A serial transfer on the AD7328 consists of 16 SCLK cycles. The three MSBs ...
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AD7328 CONTROL REGISTER The control register is used to select the analog input channel, analog input configuration, reference, coding, and power mode. The control register is a write-only, 12-bit register. Data loaded on the DIN line corresponds to the AD7328 ...
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Table 11. Power Mode Selection PM1 PM0 Description 1 1 Full shutdown mode. In this mode, all internal circuitry on the AD7328 is powered down. Information in the control register is retained when the AD7328 is in full shutdown mode. ...
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AD7328 SEQUENCE REGISTER The sequence register on the AD7328 is an 8-bit, write-only register. Each of the eight analog input channels has one corresponding bit in the sequence register. To select a channel for inclusion in the sequence, set the ...
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SEQUENCER OPERATION CS DIN: WRITE TO CONTROL REGISTER TO STOP THE SEQUENCE, SEQ1 = 0, SEQ2 = 0. DOUT: CONVERSION RESULT FROM CHANNEL IN SEQUENCE. The AD7328 can be configured to automatically cycle through a number of selected channels using ...
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AD7328 If a write to one of the range registers is required during a se- quence necessary to first stop the sequence by writing to the control register and setting SEQ1 to 0 and SEQ2 to 0. Next, ...
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REFERENCE The AD7328 can operate with either the internal 2.5 V on-chip reference or an externally applied reference. The internal reference is selected by setting the REF bit in the control register power-up, the REF bit is ...
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AD7328 MODES OF OPERATION The AD7328 has several modes of operation that are designed to provide flexible power management options. These options can be chosen to optimize the power dissipation/throughput rate ratio for different application requirements. The mode of operation ...
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AUTOSHUTDOWN MODE (PM1 = 1, PM0 = 0) Once the autoshutdown mode is selected, the AD7328 auto- th matically enters shutdown on the 15 SCLK rising edge. In autoshutdown mode, all internal circuitry is powered down. The AD7328 retains information ...
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AD7328 POWER VS. THROUGHPUT RATE The power consumption of the AD7328 varies with the throughput rate. The static power consumed by the AD7328 is very low, and significant power savings can be achieved as the throughput rate is reduced. Figure ...
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SERIAL INTERFACE Figure 53 shows the timing diagram for the serial interface of the AD7328. The serial clock applied to the SCLK pin provides the conversion clock and controls the transfer of information to and from the AD7328 during a ...
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AD7328 MICROPROCESSOR INTERFACING The serial interface on the AD7328 allows the part to be directly connected to a range of different microprocessors. This section explains how to interface the AD7328 with some common microcontroller and DSP serial interface protocols. AD7328 ...
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APPLICATIONS INFORMATION LAYOUT AND GROUNDING The printed circuit board that houses the AD7328 should be designed so that the analog and digital sections are confined to certain areas of the board. This design facilitates the use of ground planes that ...
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... Model Temperature Range 1 AD7328BRUZ –40°C to +85°C 1 AD7328BRUZ-REEL –40°C to +85°C 1 AD7328BRUZ-REEL7 –40°C to +85° EVAL-AD7328CBZ 1, 3 EVAL-CONTROL BRD2Z RoHS Compliant Part. 2 This can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL board for evaluation/demonstration purposes. ...
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NOTES Rev Page AD7328 ...
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AD7328 NOTES ©2005–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04852-0-2/10(B) Rev Page ...