AD7891 True Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition System

The AD7891 is an eight-channel 12-bit data acquisition system with a choice of either parallel or serial interface structure. The part contains an input multiplexer, an on-chip track/hold amplifier, a high speed 12-bit ADC, a +2.5 V reference and a high speed interface. The part operates from a single +5 V supply and accepts a variety of analog input ranges across two models, the AD7891-1 (±5 V and ±10 V) and the AD7891-2 (0 V to +2.5 V, 0 V to +5 V and ±2.5 V).

The AD7891 provides the option of either a parallel interface or serial interface structure determined by the MODE pin. The part has standard control inputs and fast data access times for both the serial and parallel interfaces which ensures easy interfacing to modern microprocessors, microcontrollers and digital signal processors.

In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the part is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.

Power dissipation in normal mode is 90 mW typical while in the standby mode this is reduced to 75 µW typ. The part is available in a 44-pin plastic quad flat-pack (PQFP) and a 44- lead plastic leaded chip carrier (PLCC).

Features and Benefits
  • Fast 12-Bit ADC with 1.6 µs Conversion Time
  • 8 Single-Ended Analog Input Channels
  • Overvoltage Protection on Each Channel
  • Selection of Input Ranges:
    ±5 V, ±10 V for AD7891-1
    0 to +2.5 V, 0 to +5 V, ±2.5 V for AD7891-2
  • Parallel and Serial Interface
  • On-Chip Track/Hold Amplifier
  • On-Chip Reference
  • Single-Supply, Low Power Operation (100 mW Max)
  • Power-Down Mode (75 µW Typ)
Analog to Digital Converters
Data Sheets
Documentnote
AD7891: LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System Data Sheet (Rev. D)PDF 1111 kB
Product Highlight
Documentnote
8- to 18-Bit SAR ADCs ... From the Leader in High Performance AnalogPDF 1885 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7891ACHIPS-1 ProductionCHIPS OR DIEREEL 3525C24.1724.17Y
AD7891AP-1 Production44 ld PLCCOTH 27-40 to 85C21.4718.1N
AD7891AP-1REEL Production44 ld PLCCREEL 500-40 to 85C018.1N
AD7891AP-2 Production44 ld PLCCOTH 27-40 to 85C22.5419.01N
AD7891AP-2REEL Production44 ld PLCCREEL 500-40 to 85C00N
AD7891APZ-1 Production44 ld PLCCOTH 27-40 to 85C18.615.68Y
AD7891APZ-1REEL Production44 ld PLCCREEL 500-40 to 85C015.68Y
AD7891APZ-2 Production44 ld PLCCOTH 27-40 to 85C18.615.68Y
AD7891APZ-2REEL Production44 ld PLCCREEL 500-40 to 85C015.68Y
AD7891ASZ-1 Production44 ld MQFP (13.90mm wide)OTH 96-40 to 85C17.7114.93Y
AD7891ASZ-1REEL Production44 ld MQFP (13.90mm wide)REEL 800-40 to 85C014.93Y
AD7891ASZ-2 Production44 ld MQFP (13.90mm wide)OTH 96-40 to 85C17.7114.93Y
AD7891ASZ-2REEL Production44 ld MQFP (13.90mm wide)REEL 800-40 to 85C17.7114.93Y
AD7891BP-1 Production44 ld PLCCOTH 27-40 to 85C27.0723.01N
AD7891BP-2 Production44 ld PLCCOTH 27-40 to 85C00N
AD7891BPZ-1 Production44 ld PLCCOTH 27-40 to 85C22.3118.96Y
AD7891BPZ-1REEL Last Time Buy44 ld PLCCREEL 500-40 to 85C018.96Y
AD7891BSZ-1 Production44 ld MQFP (13.90mm wide)OTH 96-40 to 85C21.2518.06Y
AD7891BSZ-2 Production44 ld MQFP (13.90mm wide)OTH 96-40 to 85C21.2518.06Y
AD7891YPZ-1 Production44 ld PLCCOTH 27-55 to 105C41.9535.7Y
AD7891YSZ-1 Production44 ld MQFP (13.90mm wide)OTH 96-55 to 105C39.9534Y
AD7891YSZ-2 Production44 ld MQFP (13.90mm wide)OTH 96-55 to 105C39.9534Y
Reference Materials
AD7891: LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System Data Sheet (Rev. D) ad7891
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog ad7893
MS-2210:高速ADC的电源设计 ad9861