Datasheet AD7329 (Analog Devices)

1 MSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC Data Sheet AD7329 FEATURES FUNCTIONAL BLOCK DIAGRAM MUXOUT+ MUXOUT– ADC V REF IN– ADCIN+ DD IN/REFOUT V 12-bit plus sign SAR ADC CC True bipolar input ranges 2.5V VREF Software-selectable input ranges VIN0 ±10 V, ±5 V, ±2.5 V, 0 V to +10 V VIN1 V 1 MSPS throughput rate IN2 13-BIT SUCCESSIVE I/P VIN3 T/H APPROXIMATION MUX 8 analog input channels with channel sequencer ADC VIN4 Single-ended true differential and pseudo differential VIN5 VIN6 analog input capability VIN7 High analog input impedance DOUT CONTROL SCLK MUX LOGIC AND OUT and ADCIN pins allow separate access to mux and ADC CHANNEL REGISTERS CS SEQUENCER Low power: 21 mW DIN AD7329 Temperature indicator
01 0 2- 40
V AGND Full power signal bandwidth: 20 MHz SS VDRIVE
05 Figure 1.
Internal 2.5 V reference High speed serial interface i CMOS process technology 24-lead TSSOP package Power-down modes GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD73291 is an 8-channel, 12-bit plus sign successive 1. The AD7329 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- CMOS and low voltage CMOS. It enables the development of ended inputs, four true differential input pairs, four pseudo a wide range of high performance analog ICs capable of 33 V differential inputs, or seven pseudo differential inputs. operation in a footprint that no previous generation of high 3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™- voltage parts could achieve. Unlike analog ICs using conventional compatible interface. CMOS processes, iCMOS components can accept bipolar input 4. Low power, 21 mW, at 1 MSPS. signals while providing increased performance, dramatically 5. The MUXOUT± and ADCIN± pins allow for signal conditioning reduced power consumption, and reduced package size. of the mux output prior to entering the ADC. The AD7329 can accept true bipolar analog input signals. The
Table 1. Similar Devices
AD7329 has four software-selectable input ranges: ±10 V, ±5 V,
Device
±2.5 V, and 0 V to +10 V. Each analog input channel can be
Number Throughput Rate Number of Channels
independently programmed to one of the four input ranges. AD7328 1000 kSPS 8 The analog input channels on the AD7329 can be programmed AD7327 500 kSPS 8 to be single-ended, true differential, or pseudo differential. AD7324 1000 kSPS 4 The ADC contains a 2.5 V internal reference. The AD7329 also AD7323 500 kSPS 4 allows for external reference operation. If a 3 V reference is AD7322 1000 kSPS 2 applied to the REFIN/REFOUT pin, the AD7329 can accept a true AD7321 500 kSPS 2 bipolar ±12 V analog input. The ADC has a high speed serial interface that can operate at throughput rates up to 1 MSPS. 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 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 AD7329 TO ADSP-21xx AD7329 TO ADSP-BF53x APPLICATIONS INFORMATION LAYOUT AND GROUNDING POWER SUPPLY CONFIGURATION OUTLINE DIMENSIONS ORDERING GUIDE