19-1899; Rev 1; 5/04
12-Bit, 20Msps, 3.3V, Low-Power ADC with
Internal Reference
Ordering Information
PART
TEMP RANGE
MAX1422CCM
0°C to +70°C
48 TQFP
MAX1422ECM
-40°C to +85°C
48 TQFP
37
38
39
40
41
42
43
44
45
46
AGND
AVDD
CML
REFN
REFP
REFIN
AVDD
AGND
PD
OE
D11
D10
47
48
AGND
AVDD
AVDD
AGND
AGND
1
36
2
35
3
34
4
33
5
32
INP
INN
6
31
AGND
AGND
AVDD
8
29
30
26
12
25
DVDD
DVDD
DGND
DGND
D5
D4
D3
D2
24
11
23
27
22
28
21
9
10
20
AVDD
AGND
MAX1422
7
D9
D8
D7
D6
AGND
AVDD
AVDD
AGND
CLK
CLK
AGND
AVDD
DVDD
DGND
D0
D1
Functional Diagram appears at end of data sheet.
PIN-PACKAGE
Pin Configuration
13
IF and Baseband Digitization
♦ Space-Saving 48-Pin TQFP Package
19
Radar
♦ Power-Down Modes
130mW (Reference Shutdown Mode)
10µW (Shutdown Mode)
18
Data Acquisition
♦ Differential Wideband Input T/H Amplifier
17
CCD Pixel Processing
♦ Internal 2.048V Precision Bandgap Reference
16
Medical Ultrasound Imaging
♦ 67dB SNR at fIN = 5MHz
15
________________________Applications
♦ Single 3.3V Power Supply
14
The MAX1422 3.3V, 12-bit analog-to-digital converter
(ADC) features a fully differential input, pipelined, 12stage ADC architecture with wideband track-and-hold
(T/H) and digital error correction incorporating a fully-differential signal path. The MAX1422 is optimized for lowpower, high dynamic performance applications in
imaging and digital communications. The converter
operates from a single 3.3V supply, consuming only
137mW while delivering a 67dB (typ) signal-to-noise
ratio (SNR) at a 5MHz input frequency and a 20Msps
sampling frequency. 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 ADCs full-scale range. A flexible reference structure
accommodates an internally 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 MAX1422 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 2mA
(typ) supply current reduction. For idle periods, a full
shutdown mode is available to maximize power savings.
The MAX1422 provides parallel, offset binary, CMOScompatible three-state outputs.
The MAX1422 is available in a 7mm ✕ 7mm ✕ 1.4mm,
48-pin TQFP package and is specified over the commercial (0°C to +70°C) and extended industrial (-40°C
to +85°C) temperature ranges.
Pin-compatible higher-speed versions of the MAX1422
are also available. Please refer to the MAX1421 data
sheet for 40Msps and the MAX1420 data sheet for
60Msps.
Features
TQFP
________________________________________________________________ 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.
1
MAX1422
General Description
MAX1422
12-Bit, 20Msps, 3.3V, Low-Power ADC with
Internal Reference
ABSOLUTE MAXIMUM RATINGS
AVDD, DVDD to AGND ..............................................-0.3V to +4V
DVDD, AVDD to DGND..............................................-0.3V to +4V
DGND to AGND.....................................................-0.3V to +0.3V
INP, INN, REFP, REFN, REFIN,
CML,CLK, CLK, ....................(AGND - 0.3V) to (AVDD + 0.3V)
D0–D11, OE, PD .......................(DGND - 0.3V) to (DVDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
48-Pin TQFP (derate 21.7mW/°C above +70°C)........1739mW
Operating Temperature Ranges
MAX1422CCM ....................................................0°C to +70°C
MAX1422ECM .................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VAVDD = VDVDD = 3.3V, AGND = DGND = 0, VIN = ±1.024V, differential input voltage at -0.5dBFS, internal reference, fCLK = 20MHz (50%
duty cycle); digital output load CL = 10pF, ≥+25°C guaranteed by production test,
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