MAX1421ECM+D Maxim Integrated Products, MAX1421ECM+D Datasheet

IC ADC 12BIT 40MSPS 48LQFP

MAX1421ECM+D

Manufacturer Part Number
MAX1421ECM+D
Description
IC ADC 12BIT 40MSPS 48LQFP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1421ECM+D

Number Of Bits
12
Sampling Rate (per Second)
40M
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
214mW
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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, con-
suming 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 band-
width 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 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 1; 5/06
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
General Description
12-Bit, 40Msps, 3.3V, Low-Power ADC
with Internal Reference
♦ Single 3.3V Power Supply
♦ 67dB SNR at f
♦ 66dB SNR at f
♦ Internal, 2.048V Precision Bandgap Reference
♦ Differential, Wideband Input T/H Amplifier
♦ Power-Down Modes
♦ Space-Saving 48-Pin TQFP Package
+Denotes lead-free package.
M AX1421CCM
M AX1421ECM
M AX1421ECM+
AGND
AGND
AGND
AGND
AGND
AGND
AV
AV
AV
AV
INN
INP
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
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
= 5MHz
= 15MHz
0°C to +70°C
Ordering Information
48-TQFP
MAX1421
Pin Configuration
PIN-
PACKAGE
48 TQFP
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
CODE
C48-2
C48-2
C48-2
PKG
DD
DD
1

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MAX1421ECM+D Summary of contents

Page 1

... CCD Pixel Processing Data Acquisition Radar IF and Baseband Digitization Functional Diagram appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. with Internal Reference ♦ Single 3.3V Power Supply ♦ ...

Page 2

Low-Power ADC with Internal Reference ABSOLUTE MAXIMUM RATINGS AGND ..............................................-0. DGND..............................................-0. DGND to AGND.....................................................-0.3V to +0.3V INP, INN, REFP, REFN, REFIN, ...

Page 3

Low-Power ADC ELECTRICAL CHARACTERISTICS (continued 3.3V, AGND = DGND = 0, V AVDD DVDD f = 40MHz (50% duty cycle), digital output load C CLK by design and characterization. Typical values are at ...

Page 4

Low-Power ADC with Internal Reference ELECTRICAL CHARACTERISTICS (continued 3.3V, AGND = DGND = 0, V AVDD DVDD f = 40MHz (50% duty cycle), digital output load C CLK by design and characterization. Typical ...

Page 5

Low-Power ADC ELECTRICAL CHARACTERISTICS (continued 3.3V, AGND = DGND = 0, V AVDD DVDD f = 40MHz (50% duty cycle), digital output load C CLK by design and characterization. Typical values are at ...

Page 6

Low-Power ADC with Internal Reference ( 3.3V, AGND = DGND = 0, V AVDD DVDD load C = 10pF unless otherwise noted. Typical values are ...

Page 7

Low-Power ADC ( 3.3V, AGND = DGND = 0, V AVDD DVDD load C = 10pF unless otherwise noted. Typical values are MIN MAX, SPURIOUS-FREE ...

Page 8

Low-Power ADC with Internal Reference ( 3.3V, AGND = DGND = 0, V AVDD DVDD load C = 10pF unless otherwise noted. Typical values are ...

Page 9

Low-Power ADC PIN NAME 12, 13, AGND Analog Ground. Connect all return paths for analog signals to AGND. 16, 19, 41 10, Analog Supply Voltage. For optimum performance bypass ...

Page 10

Low-Power ADC with Internal Reference Detailed Description The MAX1421 uses a 12-stage, fully-differential, pipe- lined architecture (Figure 1) that allows for high-speed conversion while minimizing power consumption. Each sample moves through a pipeline stage every half- clock-cycle. ...

Page 11

Low-Power ADC Figure 3. Unbuffered External Reference Drive—Internal Reference Disabled The MAX1421 provides three modes of reference oper- ation: • Internal reference mode • Buffered external reference mode • Unbuffered external reference mode ...

Page 12

Low-Power ADC with Internal Reference INP ADC INN A VDD 10kΩ CLK 10kΩ CLK AGND Figure 4. Simplified Clock Input Circuit Figure 4 shows a simplified model of the clock input cir- cuit. This circuit consists of ...

Page 13

Low-Power ADC N ANALOG INPUT CLK t DO CLK DATA OUTPUT Figure 6. System and Output Timing Diagram Using Transformer Coupling An RF transformer (Figure 8) provides an excellent solu- tion to convert a ...

Page 14

Low-Power ADC with Internal Reference 300Ω 300Ω +5V 0.1µF INPUT MAX4108 0.1µF -5V 300Ω 300Ω Figure 7. Typical Application Circuit for Single-Ended to Differential Conversion error specification of less than 1LSB guarantees no missing codes. Dynamic Parameter ...

Page 15

Low-Power ADC V IN Figure 8. Using a Transformer for AC-Coupling V IN MAX4108 Figure 9. Single-Ended AC-Coupled Input Signal CLK CLK ANALOG INPUT SAMPLED DATA (T/H) TRACK HOLD T/H Figure 10. Track-and-Hold ...

Page 16

Low-Power ADC with Internal Reference Total Harmonic Distortion (THD) THD is typically the ratio of the RMS sum of the first four harmonics of the input signal to the fundamental itself. This is expressed as: (  ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 17 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products with Internal Reference Package Information PACKAGE OUTLINE, 32/48L LQFP, 7x7x1 ...

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