Datasheet AD7323 (Analog Devices)

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500 kSPS, 4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet AD7323 FEATURES FUNCTIONAL BLOCK DIAGRAM 12-bit plus sign SAR ADC VDD REFIN/OUT VCC True bipolar input ranges AD7323 Software-selectable input ranges ±10 V, ±5 V, ±2.5 V, 0 V to +10 V 2.5V VIN0 VREF 500 kSPS throughput rate V 13-BIT IN1 I/P SUCCESSIVE MUX T/H Four analog input channels with channel sequencer VIN2 APPROXIMATION V ADC IN3 Single-ended, true differential, and pseudo differential analog input capability High analog input impedance Low power: 18 mW DOUT CHANNEL CONTROL LOGIC SCLK Full power signal bandwidth: 22 MHz SEQUENCER AND REGISTERS CS Internal 2.5 V reference DIN High speed serial interface VDRIVE Power-down modes
001
16-lead TSSOP package AGND VSS DGND
05400-
i CMOS process technology
Figure 1.
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73231 is a 4-channel, 12-bit plus sign successive 1. The AD7323 can accept true bipolar analog input signals, approximation analog-to-digital converter (ADC) designed on ±10 V, ±5 V, and ±2.5 V, and 0 V to +10 V unipolar signals. the iCMOS™ (industrial CMOS) process. iCMOS is a process 2. The four analog inputs can be configured as four single- combining high voltage silicon with submicron CMOS and ended inputs, two true differential input pairs, two pseudo complementary bipolar technologies. It enables the development differential inputs, or three pseudo differential inputs. of a wide range of high performance analog ICs capable of 33 V 3. 500 kSPS serial interface. SPI-/QSPI™-/DSP-/MICROWIRE™- operation in a footprint that no previous generation of high compatible interface. voltage parts could achieve. Unlike analog ICs using conven- 4. Low power, 18 mW, at a maximum throughput rate of tional CMOS processes, iCMOS components can accept bipolar 500 kSPS. input signals while providing increased performance, dramati- 5. Channel sequencer. cally reduced power consumption, and reduced package size.
Table 1. Similar Devices
The AD7323 can accept true bipolar analog input signals. The AD7323 has four software selectable input ranges, ±10 V, ±5 V,
Device Throughput Number of Number Rate Number of bits Channels
±2.5 V, and 0 V to +10 V. Each analog input channel can be AD7329 1000 kSPS 12-bit plus sign 8 independently programmed to one of the four input ranges. AD7328 1000 kSPS 12-bit plus sign 8 The analog input channels on the AD7323 can be programmed AD7327 500 kSPS 12-bit plus sign 8 to be single-ended, true differential, or pseudo differential. AD7324 1000 kSPS 12-bit plus sign 4 The ADC contains a 2.5 V internal reference. The AD7323 also AD7322 1000 kSPS 12-bit plus sign 2 allows for external reference operation. If a 3 V reference is AD7321 500 kSPS 12-bit plus sign 2 applied to the REFIN/OUT pin, the AD7323 can accept a true bipolar ±12 V analog input. Minimum ±12 V VDD and VSS supplies are required for the ±12 V input range. The ADC has a high speed serial interface that can operate at throughput rates up to 500 kSPS. 1 Protected by U.S. Patent No. 6,731,232.
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Document Outline Features Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Circuit Information Converter Operation Output Coding Transfer Functions Analog Input Structure Track-and-Hold Section Typical Connection Diagram Analog Input Single-Ended Inputs True Differential Mode Pseudo Differential Inputs Driver Amplifier Choice Registers Addressing Registers Control Register Sequence Register Range Register Sequencer Operation Reference VDRIVE Modes of Operation Normal Mode (PM1 = PM0 = 0) Full Shutdown Mode (PM1 = PM0 = 1) Autoshutdown Mode (PM1 = 1, PM0 = 0) Autostandby Mode (PM1 = 0, PM0 = 1) Power vs. Throughput Rate Serial Interface Microprocessor Interfacing AD7323 to ADSP-21xx AD7323 to ADSP-BF53x Application Hints Layout and Grounding Power Supply Configuration Outline Dimensions Ordering Guide