The MAX154/MAX158 and MX7824/MX7828 are high-speed, multi-channel analog-to-digital converters (ADCs). The MAX154 and MX7824 have four analog input channels, while the MAX158 and MX7828 have eight channels. Conversion time for all devices is 2.5µs. The MAX154/MAX158 also feature a 2.5V on-chip reference, forming a complete high-speed data acquisition system. All four converters include a built-in track/hold, eliminating the need for an external track/hold with many input signals. The analog input range is 0V to +5V, although the ADC operates from a single +5V supply. Microprocessor interfaces are simplified by the ADC’s ability to appear as a memory location or I/O port without the need for external logic. The data outputs use latched, three-state buffer circuitry to allow direct connection to a microprocessor data bus or system input port. The MX7824 and MX7828 are pin compatible with Analog Devices’ AD7824 and AD7828. The MAX154 and MAX158, which feature internal references, are also compatible with these products.
The MX7824 (four‑channel) and MX7828 (eight‑channel) are CMOS high‑speed analog‑to‑digital converters designed for data‑acquisition, DSP, telecommunications and servo control applications. They operate from a single +5 V supply and include a built‑in track/hold circuit, eliminating the need for external components.
The devices feature a half‑flash conversion architecture, providing 2.5 µs conversion per channel, three‑state data outputs, and optional internal 2.5 V reference (MAX154/MAX158). Detailed electrical characteristics, pin configurations, and ordering information are provided for multiple package options.
| Resolution | 8 Bits |
|---|---|
| Conversion Time per Channel | 2.5 µs |
| Supply Voltage | +5 V ±5 % |
| Power Dissipation | 25‑75 mW |
| Analog Input Voltage Range | 0 V to +5 V |
| Reference Resistance | 1.4 kΩ |
| Analog Input Capacitance | 45 pF |
| Input High Voltage (VIH) | 2.4 V |
| Input Low Voltage (VIL) | 0.8 V |
| Output Noise | 200 µV rms |
The conversion time is 2.5 µs per channel.
They operate from a single +5 V supply with a ±5 % tolerance.
Only the MAX154/MAX158 versions include an internal 2.5 V reference; the MX7824/MX7828 rely on external reference pins.
The analog inputs accept voltages from 0 V to +5 V.