Datasheet AD7328 (Analog Devices)

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8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet AD7328 FEATURES FUNCTIONAL BLOCK DIAGRAM 12-bit plus sign SAR ADC VDD REFIN/OUT VCC True bipolar input ranges AD7328 Software-selectable input ranges V ±10 V, ±5 V, ±2.5 V, 0 V to +10 V IN0 2.5V VIN1 VREF 13-BIT 1 MSPS 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 V TEMPERATURE analog input capability IN6 INDICATOR VIN7 High analog input impedance DOUT Low power: 21 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 V
04852-
Power-down modes SS DGND 20-lead TSSOP package
Figure 1.
i CMOS process technology GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73281 is an 8-channel, 12-bit plus sign successive 1. The AD7328 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 eight analog inputs can be configured as eight single- silicon with submicron CMOS and complementary bipolar ended inputs, four true differential input pairs, four pseudo technologies. It enables the development of a wide range of high differential inputs, or seven pseudo differential inputs. performance analog ICs capable of 33 V operation in a footprint 3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™- that no previous generation of high voltage parts could achieve. compatible interface. Unlike analog ICs using conventional CMOS processes, iCMOS 4. Low power, 31 mW, at a maximum throughput rate of components can accept bipolar input signals while providing 1 MSPS. increased performance, dramatical y reduced power consumption, 5. Channel sequencer. and reduced package size.
Table 1. Similar Product Selection
The AD7328 can accept true bipolar analog input signals. The
Device Throughput Number of
AD7328 has four software-selectable input ranges: ±10 V, ±5 V,
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. The AD7327 500 kSPS 12-bit plus sign 8 analog input channels on the AD7328 can be programmed to be AD7324 1000 kSPS 12-bit plus sign 4 single-ended, true differential, or pseudo differential. AD7323 500 kSPS 12-bit plus sign 4 The ADC contains a 2.5 V internal reference. The AD7328 also AD7322 1000 kSPS 12-bit plus sign 2 al ows for external reference operation. If a 3 V reference is applied AD7321 500 kSPS 12-bit plus sign 2 to the REFIN/OUT pin, the AD7328 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 1 Protected by U.S. Patent No. 6,731,232. serial interface that can operate at throughput rates up to 1 MSPS.
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Document Outline Features General Description Functional Block Diagram 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 (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 AD7328 to ADSP-21xx AD7328 to ADSP-BF53x Applications Information Layout and Grounding Power Supply Configuration Outline Dimensions Ordering Guide