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MAX1421 fiches techniques PDF

Maxim Integrated - 12-Bit / 40Msps / +3.3V / Low-Power ADC with Internal Reference

Numéro de référence MAX1421
Description 12-Bit / 40Msps / +3.3V / Low-Power ADC with Internal Reference
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX1421 fiche technique
19-1900; Rev 0; 5/01
12-Bit, 40Msps, +3.3V, Low-Power ADC
with Internal Reference
General Description
The MAX1421 is a +3.3V, 12-bit analog-to-digital con-
verter (ADC), featuring a fully-differential input,
pipelined, 12-stage ADC architecture with wideband
track-and-hold (T/H) and digital error correction incor-
porating 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 sig-
nal-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 sin-
gle-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 applica-
tions requiring increased accuracy or a different input
voltage range.
In addition to low operating power, the MAX1421 fea-
tures 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 peri-
ods, 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.
________________________Applications
Medical Ultrasound Imaging
CCD Pixel Processing
Data Acquisition
Radar
IF and Baseband Digitization
Features
o Single +3.3V Power Supply
o 67dB SNR at fIN = 5MHz
o 66dB SNR at fIN = 15MHz
o Internal, +2.048V Precision Bandgap Reference
o Differential, Wideband Input T/H Amplifier
o Power-Down Modes
180mW (Reference Shutdown Mode)
10µW (Shutdown Mode)
o Space-Saving 48-Pin TQFP Package
PART
MAX1421CCM
MAX1421ECM
Ordering Information
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
48 TQFP
48 TQFP
Pin Configuration
AGND
AVDD
AVDD
AGND
AGND
INP
INN
AGND
AGND
AVDD
AVDD
AGND
1
2
3
4
5
6
7
8
9
10
11
12
MAX1421
36 D9
35 D8
34 D7
33 D6
32 DVDD
31 DVDD
30 DGND
29 DGND
28 D5
27 D4
26 D3
25 D2
Functional Diagram appears at end of data sheet.
48-TQFP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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