Datasheet AD7327 (Analog Devices)

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500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet AD7327 FEATURES FUNCTIONAL BLOCK DIAGRAM 12-bit plus sign SAR ADC VDD REFIN/OUT VCC True bipolar input ranges AD7327 Software-selectable input ranges V ±10 V, ±5 V, ±2.5 V, 0 V to +10 V IN0 2.5V VIN1 VREF 13-BIT 500 kSPS throughput rate VIN2 I/P SUCCESSIVE T/H MUX V APPROXIMATION 8 analog input channels with channel sequencer IN3 ADC VIN4 Single-ended, true differential, and pseudo differential VIN5 VIN6 TEMPERATURE analog input capability INDICATOR VIN7 High analog input impedance DOUT Low power: 18 mW CONTROL LOGIC SCLK AND REGISTERS Temperature indicator CS CHANNEL SEQUENCER DIN Full power signal bandwidth: 22 MHz Internal 2.5 V reference VDRIVE High speed serial interface
001
AGND VSS DGND Power-down modes
05401- Figure 1.
20-lead TSSOP package i CMOS™ process technology GENERAL DESCRIPTION
serial interface that can operate at throughput rates up to 500 kSPS. The AD73271 is an 8-channel, 12-bit plus sign successive
PRODUCT HIGHLIGHTS
approximation ADC designed on the iCMOS (industrial 1. The AD7327 can accept true bipolar analog input signals, CMOS) process. iCMOS is a process combining high voltage ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals. silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high 2. The eight analog inputs can be configured as eight single- performance analog ICs capable of 33 V operation in a footprint ended inputs, four true differential inputs, four pseudo that no previous generation of high voltage parts could achieve. differential inputs, or seven pseudo differential inputs. Unlike analog ICs using conventional CMOS processes, iCMOS 3. 500 kSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™- components can accept bipolar input signals while providing compatible interface. increased performance, dramatically reduced power 4. Low power, 18 mW, at a maximum throughput rate of consumption, and reduced package size. 500 kSPS. The AD7327 can accept true bipolar analog input signals. The 5. Channel sequencer. AD7327 has four software-selectable input ranges: ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Each analog input channel can be
Table 1. Similar Devices
independently programmed to one of the four input ranges.
Device Throughput Number of
The analog input channels on the AD7327 can be programmed
Number Rate Number of bits Channels
to be single-ended, true differential, or pseudo differential. AD7329 1000 kSPS 12-bit plus sign 8 The ADC contains a 2.5 V internal reference. The AD7327 also AD7328 1000 kSPS 12-bit plus sign 8 allows external reference operation. If a 3 V reference is applied AD7324 1000 kSPS 12-bit plus sign 4 to the REFIN/OUT pin, the AD7327 can accept a true bipolar AD7323 500 kSPS 12-bit plus sign 4 ±12 V analog input. Minimum ±12 V V AD7322 1000 kSPS 12-bit plus sign 2 DD and VSS supplies are required for the ±12 V input range. The ADC has a high speed AD7321 500 kSPS 12-bit plus sign 2 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 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 Registers Sequencer Operation Reference VDRIVE Temperature Indicator Modes of Operation Normal Mode Full Shutdown Mode Autoshutdown Mode Autostandby Mode Power vs. Throughput Rate Serial Interface Microprocessor Interfacing AD7327 to ADSP-21xx AD7327 to ADSP-BF53x Application Hints Layout and Grounding Power Supply Configuration Outline Dimensions Ordering Guide