Overview
The MAX121 is a complete, BiCMOS, serial-output, sampling 14-bit analog-to-digital converter (ADC) developed by Analog Devices Inc./Maxim Integrated. This device integrates an on-chip track/hold and a low-drift, low-noise, buried-zener voltage reference, offering fast conversion speeds and low power consumption. The MAX121 is designed to operate with a throughput rate of up to 308k samples per second (ksps) and supports a full-scale analog input range of ±5V. It utilizes the successive-approximation architecture with a high-speed DAC to achieve both fast conversion speeds and low-power operation.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Resolution | 14-bit | |
| Throughput Rate | Up to 308ksps | |
| Analog Input Range | ±5V | |
| Power Supplies | +5V, -12V or -15V | |
| Power Consumption | 210mW | |
| Operating Temperature Range | 0°C to +70°C (MAX121C), -40°C to +85°C (MAX121E) | |
| Package Options | 16-pin DIP, 16-pin Wide SO, 20-pin SSOP | |
| Clock Frequency Range | 1.1MHz to 5.5MHz | |
| Input Current | 2.5mA (VAIN = 5V) | |
| Input Capacitance | 10pF | |
| Full-Power Bandwidth | 1.5MHz |
Key Features
- Successive-approximation architecture with a high-speed DAC for fast conversion speeds and low-power operation.
- On-chip track/hold and low-drift, low-noise, buried-zener voltage reference.
- Direct interface to the serial port of most popular digital-signal processors.
- TTL- and CMOS-compatible logic inputs and outputs.
- Three modes of operation: controlled by CONVST input, CS input, and continuous-conversion mode.
- Low power consumption of 210mW.
- High SINAD (Signal-to-Noise and Distortion) of 78dB.
Applications
The MAX121 is suitable for a variety of applications that require high-speed, low-power analog-to-digital conversion. These include:
- Digital signal processing (DSP) systems.
- Data logging and similar applications where continuous conversion is necessary.
- Systems that require precise sampling at specific times, such as in scientific instruments and industrial control systems.
- Applications where the ADC shares the output data bus with other devices, utilizing the high-impedance state feature when CS is driven high.
Q & A
- What is the resolution of the MAX121 ADC?
The MAX121 has a resolution of 14 bits. - What is the maximum throughput rate of the MAX121?
The MAX121 can achieve a throughput rate of up to 308k samples per second (ksps). - What is the analog input range of the MAX121?
The full-scale analog input range is ±5V. - What are the power supply requirements for the MAX121?
The MAX121 operates with +5V and -12V or -15V power supplies. - How much power does the MAX121 consume?
The power consumption is 210mW. - What are the operating temperature ranges for the MAX121?
The operating temperature ranges are 0°C to +70°C (MAX121C) and -40°C to +85°C (MAX121E). - What package options are available for the MAX121?
The MAX121 is available in 16-pin DIP, 16-pin Wide SO, and 20-pin SSOP packages. - What is the clock frequency range for the MAX121?
The clock frequency range is from 1.1MHz to 5.5MHz. - Is the MAX121 compatible with TTL and CMOS logic?
Yes, the MAX121 has TTL- and CMOS-compatible logic inputs and outputs. - Can the MAX121 be directly interfaced to digital signal processors?
Yes, the MAX121 can be directly interfaced to the serial port of most popular digital-signal processors.
