Overview
The MAX187 and MAX189 are low-power, 12-bit serial analog-to-digital converters (ADCs) designed for applications where power consumption and space are critical. These ADCs operate from a single +5V supply and accept analog inputs ranging from 0 to 5V. They are compatible with various digital interfaces such as SPI, QSPI, and MICROWIRE, making them suitable for integration with most digital signal processors and microcontrollers.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Resolution | 12 | Bits | ||||
| Integral Nonlinearity | MAX187A/MAX189A | ±½ | LSB | |||
| Sampling Rate | 75kHz | |||||
| Supply Voltage | VDD | 4.75 | 5.25 | V | ||
| Supply Current (Operating) | IDD | MAX187 | 1.5 | 2.5 | mA | |
| Supply Current (Power-Down) | IDD | MAX187 | 10µA | |||
| Signal-to-Noise Plus Distortion Ratio | SINAD | 70 | dB | |||
| Total Harmonic Distortion | THD | -80 | dB |
Key Features
- 12-bit resolution with ±½ LSB integral nonlinearity for MAX187A/MAX189A models.
- Internal track/hold circuit with a 75kHz sampling rate.
- Single +5V operation with low power consumption (7.5mW in operating mode and 10µA in power-down mode).
- Compatible with SPI, QSPI, and MICROWIRE interfaces.
- Available in 8-pin PDIP and 16-pin SO packages.
- Excellent AC characteristics, including 70dB SINAD and -80dB THD.
Applications
- Remote DSP and sensor applications.
- Circuits where power consumption and space are crucial.
- Portable data logging and data-acquisition systems.
- High-accuracy process control and automatic testing.
- Robotics and battery-powered instruments.
- Medical instruments and other low-power, high-accuracy applications.
Q & A
- What is the resolution of the MAX187/MAX189 ADCs?
The MAX187 and MAX189 ADCs have a 12-bit resolution.
- What is the operating voltage range for the MAX187/MAX189?
The operating voltage range is from 4.75V to 5.25V.
- What are the typical power consumption values for the MAX187/MAX189?
The typical power consumption is 7.5mW in operating mode and 10µA in power-down mode.
- What interfaces are the MAX187/MAX189 compatible with?
The MAX187 and MAX189 are compatible with SPI, QSPI, and MICROWIRE interfaces.
- What is the sampling rate of the MAX187/MAX189?
The sampling rate is 75kHz.
- What are the package options for the MAX187/MAX189?
The MAX187 and MAX189 are available in 8-pin PDIP and 16-pin SO packages.
- What are the key AC characteristics of the MAX187/MAX189?
The key AC characteristics include a 70dB SINAD and -80dB THD.
- Are the MAX187 and MAX189 suitable for high-accuracy applications?
Yes, they are suitable for high-accuracy applications due to their low integral nonlinearity and high SINAD.
- Can the MAX187/MAX189 be used in battery-powered devices?
Yes, they can be used in battery-powered devices due to their low power consumption.
- What is the maximum throughput rate of the MAX187/MAX189?
The maximum throughput rate is 75ksps with an external clock of 4MHz.
