MAX1421 Maxim, MAX1421 Datasheet
MAX1421
Manufacturer Part Number
MAX1421
Description
12-Bit / 40Msps / +3.3V / Low-Power ADC with Internal Reference
Manufacturer
Maxim
Datasheet
1.MAX1421.pdf
(17 pages)
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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.
19-1900; Rev 0; 5/01
Functional Diagram appears at end of data sheet.
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.
________________________Applications
Medical Ultrasound Imaging
CCD Pixel Processing
Data Acquisition
Radar
IF and Baseband Digitization
________________________________________________________________ Maxim Integrated Products
12-Bit, 40Msps, +3.3V, Low-Power ADC
General Description
with Internal Reference
o Single +3.3V Power Supply
o 67dB SNR at f
o 66dB SNR at f
o Internal, +2.048V Precision Bandgap Reference
o Differential, Wideband Input T/H Amplifier
o Power-Down Modes
o Space-Saving 48-Pin TQFP Package
MAX1421CCM
MAX1421ECM
AGND
AGND
AGND
AGND
AGND
AGND
AV
AV
AV
AV
INP
INN
PART
DD
DD
DD
DD
180mW (Reference Shutdown Mode)
10µW (Shutdown Mode)
10
11
12
1
2
3
4
5
6
7
8
9
IN
IN
= 5MHz
= 15MHz
TEMP. RANGE
-40°C to +85°C
0°C to +70°C
Ordering Information
48-TQFP
MAX1421
Pin Configuration
PIN-PACKAGE
48 TQFP
48 TQFP
Features
36
35
34
33
32
31
30
29
28
27
26
25
D9
D8
D7
D6
DV
DV
DGND
DGND
D5
D4
D3
D2
DD
DD
1
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