MAX1421：12-Bit, 40Msps, 3.3V, Low-Power ADC with Internal Reference
The MAX1421 is a 3.3V, 12-bit analog-to-digital converter (ADC), featuring a fully-differential input, pipelined, 12-stage ADC architecture with wideband track-and-hold (T/H) and digital error correction incorporating a fully-differential signal path. The MAX1421 is optimized for low-power, high-dynamic performance applications in imaging and digital communications. The converter operates from a single 3.3V supply, consuming only 188mW while delivering a typical signal-to-noise ratio (SNR) of 66dB at an input frequency of 15MHz and a sampling frequency of 40Msps. The fully-differential input stage has a small signal -3dB bandwidth of 400MHz and may be operated with single-ended inputs. An internal 2.048V precision bandgap reference sets the full-scale range of the ADC. A flexible reference structure accommodates an internal or externally applied buffered or unbuffered reference for applications requiring increased accuracy or a different input voltage range. In addition to low operating power, the MAX1421 features two power-down modes, a reference power-down and a shutdown mode. In reference power-down, the internal bandgap reference is deactivated, resulting in a typical 2mA supply current reduction. For idle periods, a full shutdown mode is available to maximize power savings. The MAX1421 provides parallel, offset binary, CMOS-compatible three-state outputs. The MAX1421 is available in a 7mm x 7mm, 48-pin TQFP package, and is specified over the commercial (0°C to +70°C) and the extended industrial (-40°C to +85°C) temperature ranges. Pin-compatible higher- and lower-speed versions of the MAX1421 are also available. Please refer to the MAX1420 data sheet for a frequency of 60Msps and the MAX1422 data sheet for a frequency of 20Msps.
Key Features
| MAX1421: Functional Diagram Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX1421 Data Sheet | MAX1421.pdf |
Parametrics
| Part Number | Input Chan. | Resolution (bits) | Sample Rate (Msps) | AC Specs (MHz) | SFDR (dBc) | ENOB (bits) | SINAD (dB) | SNR (dB) | THD (dB) | DNL (±LSB) | INL (±LSB) | Full Pwr. BW (MHz) | ICC (mA) | Data Bus Interface | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| max ≥ | @ fIN | min | min | min | typ | See Notes | ||||||||||
| MAX1421 | 1 | 12 | 40 | 15 | 70 | 10.3 | 63.5 | 66 | -69 | 1 | 2 | 150 | 57.5 | µP/12 | LQFP/48 | $6.94 @1k |
Quality and Environmental Data
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX1421CCM+D | No Longer Available | LQFP;48 pin | -40°C to +85°C | See data sheet | |
| MAX1421CCM+TD | No Longer Available | LQFP; | -40°C to +85°C | See data sheet | |
| MAX1421CCM-D | No Longer Available | LQFP; | -40°C to +85°C | See data sheet | |
| MAX1421CCM-TD | No Longer Available | LQFP; | -40°C to +85°C | See data sheet | |
| MAX1421ECM+D | Active | LQFP,;48 pin;82.8 mm² | -40°C to +85°C | Lead Free | |
| MAX1421ECM+TD | Active | LQFP,;48 pin;82.8 mm² | -40°C to +85°C | Lead Free | |
| MAX1421ECM-D | No Longer Available | MAX1421ECM+ | LQFP,;48 pin;82.8 mm² | -40°C to +85°C | No |
| MAX1421ECM-TD | No Longer Available | MAX1421ECM+ | LQFP;48 pin | -40°C to +85°C | See data sheet |
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