Datasheet AD7324 (Analog Devices)

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4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet AD7324 FEATURES FUNCTIONAL BLOCK DIAGRAM 12-bit plus sign SAR ADC VDD REFIN/OUT VCC True bipolar input ranges AD7324 Software-selectable input ranges ±10 V, ±5 V, ±2.5 V, 0 V to +10 V 2.5V VIN0 VREF 1 MSPS throughput rate V 13-BIT IN1 I/P SUCCESSIVE MUX T/H 4 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: 21 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 V Power-down modes DRIVE
001
16-lead TSSOP package AGND VSS DGND
04864-
i CMOS™ process technology
Figure 1.
GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73241 is a 4-channel, 12-bit plus sign, successive 1. The AD7324 can accept true bipolar analog input signals, approximation ADC designed on the iCMOS (industrial ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals. CMOS) process. iCMOS is a process combining high voltage 2. The four analog inputs can be configured as four single- silicon with submicron CMOS and complementary bipolar ended inputs, two true differential input pairs, two pseudo technologies. It enables the development of a wide range of high differential inputs, or three pseudo differential inputs. performance analog ICs capable of 33 V operation in a footprint that no previous generation of high voltage parts could achieve. 3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™- Unlike analog ICs using conventional CMOS processes, iCMOS compatible interface. components can accept bipolar input signals while providing 4. Low power, 31 mW maximum, at 1 MSPS throughput rate. increased performance, dramatical y reduced power consumption, 5. Channel sequencer. and reduced package size. The AD7324 can accept true bipolar analog input signals. The
Table 1. Similar Products Selection Table
AD7324 has four software-selectable input ranges: ±10 V, ±5 V,
Device Throughput Number of
±2.5 V, and 0 V to +10 V. Each analog input channel can be
Number Rate Number of bits Channels
independently programmed to one of the four input ranges. AD7329 1000 kSPS 12-bit plus sign 8 The analog input channels on the AD7324 can be programmed AD7328 1000 kSPS 12-bit plus sign 8 to be single-ended, true differential, or pseudo differential. AD7327 500 kSPS 12-bit plus sign 8 AD7323 500 kSPS 12-bit plus sign 4 The ADC contains a 2.5 V internal reference. The AD7324 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 AD7324 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 1 MSPS. 1Protected 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 Description 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 Full Shutdown Mode Autoshutdown Mode Autostandby Mode Power vs. Throughput Rate Serial Interface Microprocessor Interfacing AD7324 to ADSP-21xx AD7324 to ADSP-BF53x Application Hints Layout and Grounding Power Supply Configuration Outline Dimensions Ordering Guide