12-Bit ADCs - Maxim Integrated Products
Description
19-3271; Rev 0; 5/04
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1.
5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs
General Description
The MAX1224/MAX1225 low-power, high-speed, serialoutput, 12-bit, analog-to-digital converters (ADCs) operate at up to 1.
5Msps.
These devices feature true-differential inputs, offering better noise immunity, distortion improvements, and a wider dynamic range over singleended inputs.
A standard SPI™/QSPI™/MICROWIRE™ interface provides the clock necessary for conversion.
These devices easily interface with standard digital signal processor (DSP) synchronous serial interfaces.
The MAX1224/MAX1225 operate from a single +2.
7V to +3.
6V supply voltage and require an external reference.
The MAX1224 has a unipolar analog input, while the MAX1225 has a bipolar analog input.
These devices feature a partial power-down mode and a full power-down mode for use between conversions, which lower the supply current to 1mA (typ) and 1µA (max), respectively.
Also featured is a separate power-supply input (VL), which allows direct interfacing to +1.
8V to VDD digital logic.
The fast conversion speed, low-power dissipation, good AC performance, and DC accuracy (±1.
5 LSB INL) make the MAX1224/MAX1225 ideal for industrial process control, motor control, and base-station applications.
The MAX1224/MAX1225 come in a 12-pin TQFN package, and are available in the commercial (0°C to +70°C) and extended (-40°C to +85°C) temperature ranges.
♦ 1.
5Msps Sampling Rate ♦ Only 18mW (typ) Power Dissipation ♦ Only 1µA (max) Shutdown Current ♦ High-Speed, SPI-Compatible, 3-Wire Serial Interface ♦ 69dB S/(N + D) at 525kHz Input Frequency ♦ Internal True-Differential Track/Hold (T/H) ♦ External Reference ♦ No Pipeline Delays ♦ Small 12-Pin TQFN Package
Features
MAX1224/MAX1225
Ordering Information
PART MAX1224CTC-T MAX1224ETC-T MAX1225CTC-T MAX1225ETC-T TEMP RANGE 0°C to +70°C 0°C to +70°C PINPACKAGE 12 TQFN-12 12 TQFN-12 INPUT Unipolar Unipolar Bipolar Bipolar
-40°C to +85°C 12 T...
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