HI-7151

Features:

• Conversion Time . . . . . . . . . . . . . . . . . . . . . . . . . . . 10µs
• Continuous Throughput Rate. . . . . . . . . . . . . . . 100kHz
• No Offset or Gain Adjustments Necessary
• Internal Track and Hold Amplifier
• Analog and Reference Inputs Fully Buffered
• µP Compatible Byte Organized Outputs
• Low Power Consumption . . . . . . . . . . . . . . . . . .150mW
• Uses a Single 2.5V Reference for ±2.5 V Input Range


Application

• µP Controlled Data Acquisition Systems
• DSP
- Avionics
- Sonar
• Process Control
- Automotive Transducer Sensing
- Industrial
• Robotics
• Digital Communications
• Image Processing


Pinout




Specifications

Supply Voltage
V+ to Gnd (DG/AG/GND) . . . . . . . . . . . . . . . . -0.3V < V+ < +5.7V
V- to Gnd (DG/AG/GND). . . . . . . . . . . . . . . . . .-5.7V < V- < +0.3V
Analog Input Pins . . . . . . . . . . . . . .  V- -0.3V < VINA < V+ +0.3V
Digital I/O Pins . . . . . . . . . . . . . . . . DG - 0.3V < VI/O < V+ +0.3V


Description

The Intersil HI-7151 is a high speed 10-bit A/D converter which uses a 2-Step Flash algorithm to achieve throughput rates of 100kHz. A unique switched capacitor technique allows a new input voltage to be sampled while a conversion is taking place.

A Track and Hold amplifier is included on the chip, consisting of two high speed amplifiers and an internal hold capacitor. Microprocessor bus interfacing is simplified by the use of standard Chip Select, Read, and Write control signals. The digital three-state outputs of HI-7151 are byte organized for interfacing the either 8- or 16-bit systems. An Over-Range pin, together with the MSB, can be used to indicate an out-of-range condition.

The HI-7151 operates with ±5V supplies. A single +2.5V reference is required to provide a bipolar input range from -2.5V to +2.5V.
Internal high speed CMOS buffers at both the analog and reference inputs simplify external drive requirements.