AD678 |
RFQ for AD678 Required Field |
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| Technical/Catalog Information | AD678AD |
| Vendor | Analog Devices Inc |
| Category | Integrated Circuits (ICs) |
| Number of Bits | 12 |
| Package / Case | 28-CDIP (600 mil) |
| Data Interface | Parallel |
| Packaging | Tube |
| Sampling Rate (Per Second) | 200k |
| Operating Temperature | -40°C ~ 85°C |
| Voltage Supply Source | Analog and Digital, Dual ± |
| Number of Inputs and Type | 1 Single-Ended, Unipolar; 1 Single-Ended, Bipolar |
| Number of Converters | 2 |
| Power Dissipation (Max) | 745mw |
| Drawing Number | * |
| RoHS Status | RoHS Non-Compliant |
| Other Names | AD678AD AD678AD |
| Product | Manufacturers | Pack | D/C |
| AD678 | Analog Devices | - | 97 |
The AD678 is a complete, multipurpose 12-bit monolithic analog-to-digital converter, consisting of a sample-hold amplifier (SHA), a microprocessor compatible bus interface, a voltage reference and clock generation circuitry.
The AD678 is specified for ac (or "dynamic") parameters such as S/N+D ratio, THD and IMD which are important in signal processing applications. In addition, the AD678K, B and T grades are fully specified for dc parameters which are important in measurement applications.
The AD678 offers a choice of digital interface formats; the 12 data bits can be accessed by a 16-bit bus in a single read operation or by an 8-bit bus in two read operations (8+4), with right or left justification. Data format is straight binary for unipolar mode and twos complement binary for bipolar mode. The input has a full-scale range of 10 V with a full power bandwidth of 1 MHz and a full linear bandwidth of 500 kHz. High input impedance (10 MΩ) allows direct connection to unbuffered sources without signal degradation.
This product is fabricated on Analog Devices' BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits; laser-trimmed thin-film resistors provide high accuracy. The converter utilizes a recursive subranging algorithm which includes error correction and flash converter circuitry to achieve high speed and resolution.
The AD678 operates from +5 V and ±12 V supplies and dissipates 560 mW (typ). The AD678 is available in 28-lead plastic DIP, ceramic DIP, and 44-lead J-leaded ceramic surface mount packages. Screening to MIL-STD-883C Class B is also available.
Features |
| ·AC and DC Characterized and Specified (K, B and T Grades)·200k Conversions per Second·1 MHz Full Power Bandwidth·500 kHz Full Linear Bandwidth·72 dB S/N+D (K, B, T Grades)·Twos Complement Data Format (Bipolar Mode)·Straight Binary Data Format (Unipolar Mode)·10 M Input Impedance·8-Bit or 16-Bit Bus Interface·On-Board Reference and Clock·10 V Unipolar or Bipolar Input Range·Commercial, Industrial and Military Temperature Range Grades·MIL-STD-883 Compliant Versions Available |
| Specification |
With Respect To |
Min |
Max |
Units |
| VCC VEE VCC VDD AGND AIN, REFIN Digital Inputs Digital Outputs Max Junction Temperature Operating Temperature J and K Grades A and B Grades S and T Grades Storage Temperature Lead Temperature (10 sec max) |
AGND AGND VEE DGND DGND AGND DGND DGND |
0.3 18 0.3 0 1 VEE 0.5 0.5 0 40 55 65 |
+18 +0.3 +26.4 +7 +1 VCC +7 VDD + 0.3 175 +70 +85 +125 +150 +300 |
V V V V V V V V °C °C °C °C °C °C |
*Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
