The MAX1340/MAX1342/MAX1346/MAX1348 integrate a multichannel, 12-bit, analog-to-digital converter (ADC) and a quad, 12-bit, digital-to-analog converter (DAC) in a single IC. The devices also include a temperature sensor and configurable general-purpose I/O ports (GPIOs) with a 25MHz SPI™-/QSPI™-/MICROWIRE™-compatible serial interface. The ADC is available in a 4 or an 8 input-channel version. The four DAC outputs settle within 2.0µs, and the ADC has a 225ksps conversion rate.
All devices include an internal reference (4.096V) providing a well-regulated, low-noise reference for both the ADC and DAC. Programmable reference modes for the ADC and DAC allow the use of an internal reference, an external reference, or a combination of both. Features such as an internal ±1°C accurate temperature sensor, FIFO, scan modes, programmable internal or external clock modes, data averaging, and AutoShutdown™ allow users to minimize both power consumption and processor requirements. The low glitch energy (4nV•s) and low digital feedthrough (0.5nV•s) of the integrated quad DACs make these devices ideal for digital control of fast-response closed-loop systems.
The devices are guaranteed to operate with a supply voltage from +4.75V to +5.25V The devices consume 2.5mA at 225ksps throughput, only 22µA at 1ksps
throughput, and under 0.2µA in the shutdown mode. The MAX1342/MAX1348 offer four GPIOs that can be configured as inputs or outputs.
The MAX1340/MAX1342/MAX1346/MAX1348 are available in 36-pin thin QFN packages. All devices are specified over the -40°C to +85°C temperature range.
Key Features
Applications/Uses
12-Bit, 225ksps ADC
Analog Multiplexer with True-Differential Track/Hold (T/H)
8 Single-Ended Channels or 4 Differential Channels (Unipolar or Bipolar) (MAX1340/MAX1342)
4 Single-Ended Channels or 2 Differential Channels (Unipolar or Bipolar) (MAX1346/MAX1348)
Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB DNL
12-Bit, Quad, 2µs Settling DAC
Ultra-Low Glitch Energy (4nV•s)
Power-Up Options from Zero Scale or Full Scale
Excellent Accuracy: ±0.5 LSB INL
Internal Reference or External Single-Ended/Differential Reference Internal Reference Voltage (4.096V)
Internal ±1°C Accurate Temperature Sensor
On-Chip FIFO Capable of Storing 16 ADC Conversion Results and One Temperature Result
On-Chip Channel-Scan Mode and Internal Data-Averaging Features
Analog Single-Supply Operation +4.75V to +5.25V
Digital Supply: 2.7V to AVDD
25MHz, SPI/QSPI/MICROWIRE Serial Interface
AutoShutdown Between Conversions
Low-Power ADC
2.5mA at 225ksps
22µA at 1ksps
0.2µA at Shutdown
Low-Power DAC: 1.5mA
Evaluation Kit Available (Order MAX1258EVKIT)
Closed-Loop Controls for Optical Components and Base Stations
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