MAX1444EHJ-T Maxim Integrated Products, MAX1444EHJ-T Datasheet

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MAX1444EHJ-T

Manufacturer Part Number
MAX1444EHJ-T
Description
Manufacturer
Maxim Integrated Products
Datasheet
The MAX1444 10-bit, 3V analog-to-digital converter
(ADC) features a pipelined 10-stage ADC architecture
with fully differential wideband track-and-hold (T/H)
input and digital error correction incorporating a fully
differential signal path. This ADC is optimized for low-
power, high dynamic performance applications in
imaging and digital communications. The MAX1444
operates from a single 2.7V to 3.6V supply, consuming
only 57mW while delivering a 59.5dB signal-to-noise
ratio (SNR) at a 20MHz input frequency. The fully differ-
ential input stage has a 400MHz -3dB bandwidth and
may be operated with single-ended inputs. In addition
to low operating power, the MAX1444 features a 5µA
power-down mode for idle periods.
An internal 2.048V precision bandgap reference is
used to set the ADC full-scale range. A flexible refer-
ence structure allows the user to supply a buffered,
direct, or externally derived reference for applications
requiring increased accuracy or a different input volt-
age range.
Higher speed, pin-compatible versions of the MAX1444
are also available. Please refer to the MAX1446 data
sheet (60Msps) and the MAX1448 data sheet
(80Msps).
The MAX1444 has parallel, offset binary, CMOS-com-
patible three-state outputs that can be operated from
1.7V to 3.6V to allow flexible interfacing. The device is
available in a 5x5mm 32-pin TQFP package and is
specified over the extended industrial (-40°C to +85°C)
temperature range.
19-1745; Rev 2; 4/04
Functional Diagram appears at end of data sheet.
________________________Applications
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.
Ultrasound Imaging
CCD Imaging
Baseband and IF Digitization
Digital Set-Top Boxes
Video Digitizing Applications
________________________________________________________________ Maxim Integrated Products
General Description
10-Bit, 40Msps, 3.0V, Low-Power
ADC with Internal Reference
MAX1444EHJ
Single 3.0V Operation
Excellent Dynamic Performance
Low Power
Fully Differential Analog Input
Wide 2V
400MHz -3dB Input Bandwidth
On-Chip 2.048V Precision Bandgap Reference
CMOS-Compatible Three-State Outputs
32-Pin TQFP Package
Evaluation Kit Available
REFN
COM
GND
GND
GND
V
59.5dB SNR at f
74dBc SFDR at f
19mA (Normal Operation)
5µA (Shutdown Mode)
IN+
IN-
PART
TOP VIEW
DD
1
2
3
4
5
6
7
8
p-p
Differential Input Voltage Range
32
9
10
31
-40°C to +85°C
TEMP RANGE
IN
11
Ordering Information
30
IN
MAX1444
TQFP
= 20MHz
= 20MHz
29
12
Pin Configuration
28
13
14
27
15
26
PIN-PACKAGE
32 TQFP
25
16
Features
24
23
22
21
20
19
18
17
D4
OGND
T.P.
OV
D5
D6
D7
D8
DD
1

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MAX1444EHJ-T Summary of contents

Page 1

... Low Power 19mA (Normal Operation) 5µA (Shutdown Mode) Fully Differential Analog Input Wide 2V p-p 400MHz -3dB Input Bandwidth On-Chip 2.048V Precision Bandgap Reference CMOS-Compatible Three-State Outputs 32-Pin TQFP Package Evaluation Kit Available PART MAX1444EHJ TOP VIEW REFN 1 COM GND 4 GND ...

Page 2

Low-Power ADC with Internal Reference ABSOLUTE MAXIMUM RATINGS GND ...............................................-0.3V to +3. OGND to GND.......................................................-0.3V to +0.3V IN+, IN- to GND........................................................-0. REFIN, REFOUT, REFP, REFN, and COM to GND........................-0.3V ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3V 2.7V; 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND REFIN through a 10kΩ resistor unless otherwise noted. ≥ +25°C ...

Page 4

Low-Power ADC with Internal Reference ELECTRICAL CHARACTERISTICS (continued 3V 2.7V; 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND REFIN through a 10kΩ resistor ...

Page 5

ELECTRICAL CHARACTERISTICS (continued 3V 2.7V; 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND REFIN through a 10kΩ resistor unless otherwise noted. ≥ +25°C ...

Page 6

Low-Power ADC with Internal Reference (V = 3.0V 2.7V, internal reference, differential input at -0.5dB FS wise noted.) FFT PLOT (f = 7.51MHz, IN 8192-POINT FFT, DIFFERENTIAL INPUT) 0 SINAD = 59dB ...

Page 7

OV = 2.7V, internal reference, differential input at -0.5dB FS wise noted.) SIGNAL-TO-NOISE RATIO vs. ANALOG INPUT FREQUENCY DIFFERENTIAL SINGLE ENDED 100 ANALOG ...

Page 8

Low-Power ADC with Internal Reference (V = 3.0V 2.7V, internal reference, differential input at -0.5dB FS wise noted.) TOTAL HARMONIC DISTORTION vs. TEMPERATURE - 19.91MHz IN -64 -68 -72 -76 ...

Page 9

OV = 2.7V, internal reference, differential input at -0.5dB FS wise noted.) DIGITAL SUPPLY CURRENT vs. TEMPERATURE 7.51MHz -40 - TEMPERATURE ...

Page 10

Low-Power ADC with Internal Reference PIN NAME Lower Reference. Conversion range REFN Bypass to GND with a > 0.1 F capacitor. 2 COM Common-Mode Voltage Output. Bypass to GND with a >0.1 F capacitor. ...

Page 11

Detailed Description The MAX1444 uses a 10-stage, fully differential, pipelined architecture (Figure 1) that allows for high- speed conversion while minimizing power consump- tion. Each sample moves through a pipeline stage every half-clock cycle. Counting the delay through the output ...

Page 12

Low-Power ADC with Internal Reference The MAX1444 provides three modes of reference oper- ation: • Internal reference mode • Buffered external reference mode • Unbuffered external reference mode In internal reference mode, the internal reference out- put ...

Page 13

AT-0.5dB CLOCK DUTY CYCLE (%) Figure 3a. Spurious-Free Dynamic Range vs. Clock Duty Cycle (Differential Input 13.24MHz AT-0.5dB ...

Page 14

Low-Power ADC with Internal Reference System Timing Requirements Figure 6 shows the relationship between the clock input, analog input, and data output. The MAX1444 samples at the falling edge of the input clock. Output data is valid ...

Page 15

INPUT MAX4108 0.1µF -5V 300Ω 300Ω Figure 7. Typical Application Circuit for Single-Ended to Differential Conversion 25Ω 10pF 0.1µ N. 2.2µF 0.1µ MINI-CIRCUITS ADT1–1WT 25Ω 10pF Figure ...

Page 16

Low-Power ADC with Internal Reference 3.3V 0.1µF 0.1µF 1 16.2kΩ 2 MAX6062 1µF 3 10Hz LOWPASS FILTER NOTE: ONE FRONT-END REFERENCE CIRCUIT DESIGN MAY BE USED WITH UP TO 1000 ADCs. Figure 10. Buffered External Reference Drives ...

Page 17

MAX6066 21.5kΩ 3 1µF 1.5V 3.3V 0.1µF 21.5kΩ MAX4254 POWER-SUPPLY BYPASSING. PLACE CAPACITOR AS CLOSE AS POSSIBLE TO THE OP AMP. 1.0V 21.5kΩ 21.5kΩ NOTE: ONE FRONT-END REFERENCE CIRCUIT DESIGN MAY BE USED WITH ...

Page 18

Low-Power ADC with Internal Reference power-supply sequencing when powering up or down. With the outputs of the MAX4252 matching better than 0.1%, the buffers and subsequent lowpass filters can be replicated to support as many as 32 ...

Page 19

Signal-to-Noise Plus Distortion (SINAD) SINAD is computed by taking the ratio of the RMS sig- nal to all spectral components minus the fundamental and the DC offset. Effective Number of Bits (ENOB) ENOB specifies the dynamic performance of an ADC ...

Page 20

... 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. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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