AD7891
PRODUCTIONTrue Bipolar Input, Single Supply, Parallel, 8-Channel, 12-Bit High Speed Data Acquisition System
- Part Models
- 15
- 1ku List Price
- Starting From $20.20
Part Details
- 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)
The AD7891 is an 8-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 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, ensuring 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 82 mW typical; in the standby mode, this is reduced to 75 mW typ. The part is available in a 44-terminal MQFP and a 44-lead PLCC.
PRODUCT HIGHLIGHTS
- The AD7891 is a complete monolithic 12-bit data acquisition system that combines an 8-channel multiplexer, 12-bit ADC, 2.5 V reference, and track/hold amplifier on a single chip.
- The AD7891-2 features a conversion time of 1.6 ms and an acquisition time of 0.4 ms. This allows a sample rate of 500 kSPS when sampling one channel and 62.5 kSPS when channel hopping. These sample rates can be achieved using either a software or hardware convert start. The AD7891-1 has an acquisition time of 0.6 ms when using a hardware convert start and an acquisition time of 0.7 ms when using a software convert start. These acquisition times allow sample rates of 454.5 kSPS and 435 kSPS, respectively, for hardware and software convert start.
- Each channel on the AD7891 has overvoltage protection. This means an overvoltage on an unselected channel does not affect the conversion on a selected channel. The AD7891-1 can withstand overvoltages of ±17 V.
APPLICATIONS
- Data Acquisition Systems
- Motor Control
- Mobile Communication Base Stations
- Instrumentation
Documentation
Data Sheet 1
Technical Articles 1
Product Highlight 1
Evaluation Design File 1
Product Highlight 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7891ACHIPS-1 | none available | ||
| AD7891APZ-1 | 44-Lead PLCC | ||
| AD7891APZ-1REEL | 44-Lead PLCC | ||
| AD7891APZ-2 | 44-Lead PLCC | ||
| AD7891APZ-2REEL | 44-Lead PLCC | ||
| AD7891ASZ-1 | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891ASZ-1REEL | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891ASZ-2 | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891ASZ-2REEL | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891BPZ-1 | 44-Lead PLCC | ||
| AD7891BSZ-1 | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891BSZ-2 | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891YPZ-1 | 44-Lead PLCC | ||
| AD7891YSZ-1 | 44-Lead MQFP (13.9mm x 10mm) | ||
| AD7891YSZ-2 | 44-Lead MQFP (13.9mm x 10mm) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 18, 2016 - 16_0034 Assembly Relocation of Select LQFP,LQFP_EP,MQFP,TQFP,TQFP_EP Products to Stats ChipPAC China Jiangyin |
||
| AD7891ASZ-1 | PRODUCTION | |
| AD7891ASZ-1REEL | PRODUCTION | |
| AD7891ASZ-2 | PRODUCTION | |
| AD7891ASZ-2REEL | PRODUCTION | |
| AD7891BSZ-1 | PRODUCTION | |
| AD7891BSZ-2 | PRODUCTION | |
| AD7891YSZ-1 | PRODUCTION | |
| AD7891YSZ-2 | PRODUCTION | |
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
||
| AD7891ASZ-1 | PRODUCTION | |
| AD7891ASZ-1REEL | PRODUCTION | |
| AD7891ASZ-2 | PRODUCTION | |
| AD7891ASZ-2REEL | PRODUCTION | |
| AD7891BSZ-1 | PRODUCTION | |
| AD7891BSZ-2 | PRODUCTION | |
| AD7891YSZ-1 | PRODUCTION | |
| AD7891YSZ-2 | PRODUCTION | |
|
Jan 5, 2009 - 07_0077 Certification of STATSChipPAC Shanghai, China and AMKOR Philippines as additional sources for Assembly & Test of QFP Packages |
||
| AD7891ASZ-1 | PRODUCTION | |
| AD7891ASZ-1REEL | PRODUCTION | |
| AD7891ASZ-2 | PRODUCTION | |
| AD7891ASZ-2REEL | PRODUCTION | |
| AD7891BSZ-1 | PRODUCTION | |
| AD7891BSZ-2 | PRODUCTION | |
| AD7891YSZ-1 | PRODUCTION | |
| AD7891YSZ-2 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.