+3V, 400ksps, 4/8 Channel, 8-Bit ADCs with 1µA Power Down

 

Part Number	Replacement	Explanation

Description

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The MAX113/MAX117 are microprocessor-compatible, 8-bit, 4-channel and 8-channel analog-to-digital converters (ADCs). They operate from a single +3V supply and use a half-flash technique to achieve a 1.8µs conversion time (400ksps). A power-down pin (active-low PWRDN) reduces current consumption to 1µA typical. The devices return from power-down mode to normal operating mode in less than 900ns, allowing large supply-current reductions in Burst Mode® applications. (In Burst Mode, the ADC wakes up from a low-power state at specified intervals to sample the analog input signals.) Both converters include a track/hold, enabling the ADC to digitize fast analog signals.

Microprocessor (µP) interfaces are simplified because the ADC can appear as a memory location or I/O port without external interface logic. The data outputs use latched, three-state buffer circuitry for direct connection to an 8-bit parallel µP data bus or system input port. The MAX113/MAX117 input/reference configuration enables ratiometric operation.

The 4-channel MAX113 is available in a 24-pin DIP or SSOP. The 8-channel MAX117 is available in a 28-pin DIP or SSOP. For +5V applications, refer to the MAX114/MAX118 data sheet.

MAX113, MAX117: Functional Diagram Enlarge+

Key Features

• +3.0V to +3.6V Single-Supply Operation
• 4 (MAX113) or 8 (MAX117) Analog Input Channels
• Low Power:
  • 1.5mA (operating mode)
  • 1µA (power-down mode)
• Total Unadjusted Error < 1LSB
• Fast Conversion Time: 1.8µs per Channel
• No External Clock Required
• Internal Track/Hold
• Ratiometric Reference Inputs
• Internally Connected 8th Channel Monitors Reference Voltage (MAX117)

Applications/Uses

• Battery-Powered Applications
• Communication Systems
• Portable Equipment
• Remote Data Acquisition
• System-Health Monitoring