General Description
The MAX1449 +3.3V, 10-bit analog-to-digital converter
(ADC) features a fully differential input, a pipelined 10-
stage ADC architecture with wideband track-and-hold
(T/H), and digital error correction incorporating a fully
differential signal path. The ADC is optimized for low-
power, high-dynamic performance in imaging and digi-
tal communications applications. The converter
operates from a single +2.7V to +3.6V supply, consum-
ing only 186mW while delivering a 58.5dB (typ) signal-
to-noise ratio (SNR) at a 20MHz input frequency. The
fully differential input stage has a -3dB 400MHz band-
width and may be operated with single-ended inputs. In
addition to low operating power, the MAX1449 features
a 5A power-down mode for idle periods.
An internal +2.048V precision bandgap reference is
used to set the ADC's full-scale range. A flexible refer-
ence structure allow's the user to supply a buffered,
direct, or externally derived reference for applications
requiring increased accuracy or a different input volt-
age range.
Lower speed, pin-compatible versions of the MAX1449
are also available. Refer to the MAX1444 data sheet for
a 40Msps version, the MAX1446 data sheet for a
60Msps version, and the MAX1448 data sheet for 80Msps.
The MAX1449 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 5mm x 5mm 32-pin TQFP package and
is specified over the extended industrial (-40C to
+85C) temperature range.
________________________Applications
Ultrasound Imaging
CCD Imaging
Baseband and IF Digitization
Digital Set-Top Boxes
Video Digitizing Applications
Features
o Single +3.3V Operation
o Excellent Dynamic Performance
58.5dB SNR at f
IN
= 20MHz
72dBc SFDR at f
IN
= 20MHz
o Low Power
62mA (Normal Operation)
5A (Shutdown Mode)
o Fully Differential Analog Input
o Wide 2Vp-p Differential Input Voltage Range
o 400MHz -3dB Input Bandwidth
o On-Chip +2.048V Precision Bandgap Reference
o CMOS-Compatible Three-State Outputs
o 32-Pin TQFP Package
o Evaluation Kit Available
MAX1449
10-Bit, 105Msps, Single +3.3V, Low-Power
ADC with Internal Reference
________________________________________________________________ Maxim Integrated Products
1
CLK
IN+
CONTROL
10
PIPELINE ADC
REF SYSTEM +
BIAS
OUTPUT
DRIVERS
D
E
C
REF
REFIN
REFOUT
REFP
COM REFN
OE
V
DD
GND
OV
DD
OGND
D9D0
IN-
PD
T/H
MAX1449
Functional Diagram
19-4802; Rev 0; 10/00
EVALUATION KIT AVAILABLE
Ordering Information
Pin Configuration appears at end of data sheet.
PART
TEMP. RANGE
PIN-PACKAGE
MAX1449EHJ
-40
C to +85C
32 TQFP
PART NUMBER
SAMPLING SPEED
MAX1444
40Msps
MAX1446
60Msps
MAX1448
80Msps
Pin-Compatible, Lower Speed
Selection Table
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
MAX1449
10-Bit, 105Msps, Single +3.3V, Low-Power
ADC with Internal Reference
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +3.3V, OV
DD
= +2.0V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; V
REFIN
= +2.048V, REFOUT
connected to REFIN through a 10k
resistor, V
IN
= 2Vp-p (differential with respect to COM), C
L
10pF at digital outputs, f
CLK
=
105MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A =
+25C.)
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.
V
DD
, OV
DD
to GND ...............................................-0.3V to +3.6V
OGND to GND.......................................................-0.3V to +0.3V
IN+, IN- to GND........................................................-0.3V to V
DD
REFIN, REFOUT, REFP,
REFN, and COM to GND..........................-0.3V to (V
DD
+ 0.3V)
OE, PD, CLK to GND..................................-0.3V to (V
DD
+ 0.3V)
D9D0 to GND.........................................-0.3V to (OV
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70C)
32-Pin TQFP (derate 11.1mW/C above +70C)...........889mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range ............................-60C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY
Resolution
10
Bits
Integral Nonlinearity
INL
f
IN
= 7.5MHz
0.75
2.4
LSB
Differential Nonlinearity
DNL
f
IN
= 7.5MHz, no missing codes guaranteed
0.5
1.0
LSB
Offset Error
<
1
1.7
% FS
Gain Error
0
2
% FS
ANALOG INPUT
Input Differential Range
V
DIFF
Differential or single-ended inputs
1.0
V
Common-Mode
Voltage Range
V
COM
V
DD
/2
0.5
V
Input Resistance
R
IN
Switched capacitor load
20
k
Input Capacitance
C
IN
5
pF
CONVERSION RATE
Maximum Clock Frequency
f
CLK
105
MHz
Data Latency
5.5
Cycles
DYNAMIC CHARACTERISTICS (f
CLK
= 105.26MHz, 4096-point FFT)
f
IN
= 7.5MHz
56.3
58.5
f
IN
= 20MHz
55.8
58.5
dB
Signal-To-Noise Ratio
(Note 1)
SNR
f
IN
= 50MHz
58
f
IN
= 7.5MHz
55.3
58.2
f
IN
= 20MHz
55.1
58.1
dB
Signal-To-Noise And Distortion
(Up to 5
th
Harmonic) (Note 1)
SINAD
f
IN
= 50MHz
57.6
f
IN
= 7.5MHz
61
72
f
IN
= 20MHz, T
A
= +25
C
63
72
dBc
Spurious-Free Dynamic
Range (Note 1)
SFDR
f
IN
= 50MHz
70
MAX1449
10-Bit, 105Msps, Single +3.3V, Low-Power
ADC with Internal Reference
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
f
IN
= 7.5MHz
-72
f
IN
= 20MHz
-72
Third-Harmonic Distortion
(Note 1)
HD3
f
IN
= 50MHz
-70
dBc
Intermodulation Distortion (First 5
Odd-Order IMDs) (Note 2)
IMD
f
1
= 38MHz at -6.5dB FS
f
2
= 42MHz at -6.5dB FS
-76
dBc
Third-Order Intermodulation
Distortion (Note 2)
IM3
f
1
= 38MHz at -6.5dB FS
f
2
= 42MHz at -6.5dB FS
-76
dBc
f
IN
= 7.5MHz, T
A
= +25
C
-70
-61.5
f
IN
= 20MHz, T
A
= +25
C
-70
-61.5
dBc
Total Harmonic Distortion
(First 5 Harmonics)
(Note 1)
THD
f
IN
= 50MHz
-70
Small-Signal Bandwidth
Input at -20dB FS, differential inputs
500
MHz
Full-Power Bandwidth
FPBW
Input at -0.5dB FS, differential inputs
400
MHz
Aperture Delay
t
AD
1
ns
Aperture Jitter
t
AJ
2
ps
RMS
Overdrive Recovery Time
For 1.5 x full-scale input
2
ns
Differential Gain
1
%
Differential Phase
0.25
degree
Output Noise
IN+ = IN- = COM
0.2
LS B
RM S
INTERNAL REFERENCE
Reference Output Voltage
REFOUT
2.048
1%
V
Reference Temperature
Coefficient
TC
REF
60
ppm/
C
Load Regulation
1.25
mV/mA
EXTERNAL REFERENCE
Positive Reference
REFP
V
REFIN
= +2.048V
2.162
V
Negative Reference
REFN
V
REFIN
= +2.048V
1.138
V
Differential Reference Voltage
V
REF
V
REFP
-V
REFN
, V
REFIN
= +2.048V
0.98
1.024
1.07
V
REFIN Resistance
R
REFIN
>50
M
DIGITAL INPUTS (CLK, PD,
OE)
CLK
0.8 x
V
DD
Input High Threshold
V
IH
PD,
OE
0.8 x
V
DD
V
CLK
0.2 x
V
DD
Input Low Threshold
V
IL
PD,
OE
0.2 x
V
DD
V
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3.3V, OV
DD
= +2.0V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; V
REFIN
= +2.048V, REFOUT
connected to REFIN through a 10k
resistor, V
IN
= 2Vp-p (differential with respect to COM), C
L
10pF at digital outputs, f
CLK
=
105MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A =
+25C.)
Note 1: SNR, SINAD, THD, SFDR and HD3 are based on an analog input voltage of -0.5dB FS referenced to a +1.024V full-scale
input voltage range.
Note 2: Intermodulation distortion is the total power of the intermodulation products relative to the individual carrier. This number is
6dB better if referenced to the two-tone envelope.
Note 3: Digital outputs settle to V
IH
,V
IL
.
Note 4: With REFIN driven externally, REFP, COM, and REFN are left floating while powered down.
MAX1449
10-Bit, 105Msps, Single +3.3V, Low-Power
ADC with Internal Reference
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Hysteresis
V
HYST
0.1
V
I
IH
V
IH
= V
DD
= OV
DD
5
A
Input Leakage
I
IL
V
IL
= 0
5
Input Capacitance
C
IN
5
pF
DIGITAL OUTPUTS (D9D0)
Output Voltage Low
V
OL
I
SINK
= 200
A
0.2
V
Output Voltage High
V
OH
I
SOURCE
= 200
A
OV
DD
- 0.2
V
Three-State Leakage Current
I
LEAK
OE = OV
DD
10
A
Three-State Output Capacitance
C
OUT
OE = OV
DD
5
pF
POWER REQUIREMENTS
Analog Supply Voltage
V
DD
2.7
3.3
3.6
V
Output Supply Voltage
OV
DD
1.7
3.3
3.6
V
Operating, f
IN
= 20MHz at -0.5dB FS
58
74
mA
Analog Supply Current
I
VDD
Shutdown, clock idle, PD = OE = OV
DD
4
15
A
Operating, C
L
= 15pF , f
IN
= 20MHz at
-0.5dB FS
10
mA
Output Supply Current
I
OVDD
Shutdown, clock idle, PD = OE = OV
DD
1
10
A
Offset
0.1
mV/V
Power Supply Rejection
PSRR
Gain
0.1
%/V
TIMING CHARACTERISTICS
CLK Rise-to-Output Data Valid
t
DO
Figure 6 (Note 3)
5
8
ns
OE Fall-to-Output Enable
t
ENABLE
Figure 5
10
ns
OE Rise-to-Output Disable
t
DISABLE
Figure 5
15
ns
CLK Pulse Width High
t
CH
Figure 6, clock period 9.52ns
4.76
0.47
ns
CLK Pulse Width Low
t
CL
Figure 6, clock period 9.52ns
4.76
0.47
ns
Wake-Up Time
t
WAKE
(Note 4)
1.5
s
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3.3V, OV
DD
= +2.0V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; V
REFIN
= +2.048V, REFOUT
connected to REFIN through a 10k
resistor, V
IN
= 2Vp-p (differential with respect to COM), C
L
10pF at digital outputs,
f
CLK
= 105MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A =
+25C.)
MAX1449
10-Bit, 105Msps, Single +3.3V, Low-Power
ADC with Internal Reference
_______________________________________________________________________________________
5
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0
20
10
30
40
50
60
FFT PLOT (f
IN
= 7.5MHz,
8192-POINT FFT, DIFFERENTIAL INPUT)
MAX1449 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
SNR = 58.6dB
SINAD = 58.4dB
THD = -72.7dBc
SFDR = 73.6dBc
2ND HARMONIC
3RD HARMONIC
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0
20
10
30
40
50
60
MAX1449 toc02
FFT PLOT (f
IN
= 19.99MHz,
8192-POINT FFT, DIFFERENTIAL INPUT)
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
SNR = 58.5dB
SINAD = 58.4dB
THD = -73.7dBc
SFDR = 75.9dBc
2ND HARMONIC
3RD HARMONIC
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0
20
10
30
40
50
60
MAX1449 toc03
UNDERSAMPLING FFT PLOT (f
IN
= 50.12MHz,
8192-POINT FFT, DIFFERENTIAL INPUT)
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
SNR = 57.9dB
SINAD = 56.7dB
THD = -71.3dBc
SFDR = 71.1dBc
2ND HARMONIC
3RD HARMONIC
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0
20
10
30
40
50
60
MAX1449 toc04
FFT PLOT (f
IN
= 7.5MHz,
8192-POINT FFT, SINGLE-ENDED INPUT)
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
SNR = 57.7dB
SINAD = 57.5dB
THD = -71.8dBc
SFDR = 74.4dBc
2ND HARMONIC
3RD HARMONIC
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0
20
10
30
40
50
60
MAX1449 toc05
FFT PLOT (f
IN
= 19.99MHz,
8192-POINT FFT, SINGLE-ENDED INPUT)
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
SNR = 57.7dB
SINAD = 57.2dB
THD = -67dBc
SFDR = 67.7dBc
2ND HARMONIC
3RD HARMONIC
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
0
20
10
30
40
50
60
MAX1449 toc06
TWO-TONE INTERMODULATION
(8192-POINT IMD, DIFFERENTIAL INPUT)
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
1
= 38MHz AT -6.5dB FS
f
2
= 42MHz AT -6.5dB FS
2ND ORDER IMD
3RD ORDER IMD
f
1
f
2
80
50
1
10
100
SPURIOUS-FREE DYNAMIC RANGE
vs. ANALOG INPUT FREQUENCY
56
MAX1449 toc07
ANALOG INPUT FREQUENCY (MHz)
SFDR (dBc)
62
68
74
DIFFERENTIAL
SINGLE-ENDED
60
50
1
10
100
SIGNAL-TO-NOISE RATIO
vs. ANALOG INPUT FREQUENCY
52
MAX1449 toc08
ANALOG INPUT FREQUENCY (MHz)
SNR (dB)
54
56
58
DIFFERENTIAL
SINGLE-ENDED
THD (dBc)
-50
-80
1
10
100
TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT FREQUENCY
-74
MAX1449 toc09
ANALOG INPUT FREQUENCY (MHz)
-68
-62
-56
DIFFERENTIAL
SINGLE-ENDED
Typical Operating Characteristics
(V
DD
= +3.3V, OV
DD
= +2.0V, internal reference, differential input at -0.5dB FS, f
CLK
= 106.2345MHz, C
L
10pF, T
A
= +25C,
unless otherwise noted.)
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