MAXIM MAX1449 Technical data
General Description
The MAX1449 3.3V, 10-bit analog-to-digital converter
(ADC) features a fully differential input, a pipelined 10stage ADC architecture with wideband track-and-hold
(T/H), and digital error correction incorporating a fully differential signal path. The ADC is optimized for lowpower, high-dynamic performance in imaging and digital
communications applications. The converter operates
from a single 2.7V to 3.6V supply, consuming 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 bandwidth and
may be operated with single-ended inputs. In addition to
low operating power, the MAX1449 features a 5µA
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 reference structure allow’s the user to supply a buffered,
direct, or externally derived reference for applications
requiring increased accuracy or a different input voltage 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-compatible, 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 (-40°C to +85°C)
temperature range.
________________________Applications
Ultrasound Imaging
CCD Imaging
Baseband and IF Digitization
Digital Set-Top Boxes
Video Digitizing Applications
Features
♦ Single 3.3V Operation
♦ Excellent Dynamic Performance
58.5dB SNR at f
IN
= 20MHz
72dBc SFDR at f
IN
= 20MHz
♦ Low Power
62mA (Normal Operation)
5µA (Shutdown Mode)
♦ Fully Differential Analog Input
♦ Wide 2Vp-p Differential Input Voltage Range
♦ 400MHz -3dB Input Bandwidth
♦ On-Chip 2.048V Precision Bandgap Reference
♦ CMOS-Compatible Three-State Outputs
♦ 32-Pin TQFP Package
♦ Evaluation Kit Available (MAX1448 EV Kit)
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
REFINREFOUT REFP COM REFN OE
V
DD
GND
OV
DD
OGND
D9–D0
IN-
PD
T/H
MAX1449
Functional Diagram
19-4802; Rev 2; 9/04
EVALUATION KIT
AVAILABLE
Ordering Information
Pin Configuration appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX1449EHJ -40°C to +85°C 32 TQFP
Pin-Compatible, Lower Speed
Selection Table
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.
PART SAMPLING SPEED (Msps)
MAX1444 40
MAX1446 60
MAX1448 80
MAX1449
10-Bit, 105Msps, Single 3.3V, Low-Power
ADC with Internal Reference
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= 3.3V, OVDD= 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, V
REFIN
= 2.048V, REFOUT connected to
REFIN through a 10kΩ resistor, V
IN
= 2V
P-P
(differential with respect to COM), CL= 10pF at digital outputs, f
CLK
= 105MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical
values are at T
A
= +25°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.
VDD, OVDDto 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 (VDD+ 0.3V)
D9–D0 to GND.........................................-0.3V to (OV
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
32-Pin TQFP (derate 18.7mW/°C above +70°C).....1495.3mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
DC ACCURACY
Resolution 10 Bits
Integral Nonlinearity INL fIN = 7.5MHz, T
A
≥ +25°C
LSB
Differential Nonlinearity DNL
f
IN
= 7.5MHz, no missing codes
guaranteed, T
A
≥ +25°C
LSB
Offset Error
Gain Error T
A
≥ +25°C, TA ≥ +25°C 0 ±2
ANALOG INPUT
Input Differential Range V
DIFF
Differential or single-ended inputs
V
Common-Mode
Voltage Range
V
COM
VDD/2
V
Input Resistance R
IN
Switched capacitor load 20 kΩ
Input Capacitance C
IN
5pF
CONVERSION RATE
Maximum Clock Frequency f
CLK
Data Latency 5.5
DYNAMIC CHARACTERISTICS (f
CLK
= 105.26MHz, 4096-point FFT)
f
IN
= 7.5MHz
fIN = 20MHz
Signal-to-Noise Ratio
(Note 1)
SNR
f
IN
= 50MHz 58
dB
fIN = 7.5MHz
fIN = 20MHz
Signal-to-Noise + Distortion (Up
to 5th Harmonic) (Note 1)
SINAD
f
IN
= 50MHz
dB
fIN = 7.5MHz 62 72
fIN = 20MHz 61 72
Spurious-Free Dynamic
Range (Note 1)
SFDR
f
IN
= 50MHz 70
dBc
SYMBOL
MIN TYP MAX UNITS
±0.75 ±2.4
±0.5 ±1.0
< ±1 ±1.7 % FS
±1.0
± 0.5
105 MHz
55.9 58.5
55.5 58.5
55.3 58.2
54.5 58.1
57.6
% FS
Cycles
MAX1449
10-Bit, 105Msps, Single 3.3V, Low-Power
ADC with Internal Reference
_______________________________________________________________________________________ 3
PARAMETER
CONDITIONS
UNITS
fIN = 7.5MHz -72
fIN = 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
fIN = 7.5MHz -70 -62
fIN = 20MHz -70 -60
Total Harmonic Distortion
(First 5 Harmonics)
(Note 1)
THD
f
IN
= 50MHz -70
dBc
Small-Signal Bandwidth Input at -20dB FS, differential inputs
MHz
Full-Power Bandwidth FPBW Input at -0.5dB FS, differential inputs
MHz
Aperture Delay t
AD
1ns
Aperture Jitter t
AJ
2
ps
RMS
Overdrive Recovery Time For 1.5 x full-scale input 2 ns
Differential Gain ±1%
Differential Phase
Degrees
Output Noise IN+ = IN- = COM 0.2
LS B
RM S
INTERNAL REFERENCE
Reference Output Voltage
V
Reference Temperature
Coefficient
TC
REF
60
ppm/°C
Load Regulation
mV/mA
BUFFERED EXTERNAL REFERENCE (V
REFIN
= 2.048V)
REFIN Input Voltage
Positive Reference Output
Voltage
V
Negative Reference Output
Voltage
V
Common-Mode Level
V
Differential Reference Output
Voltage Range
V
REFIN
∆V
REF
= V
REFP
- V
REFN
, T
A
≥ +25°C
V
REFIN Resistance V
REFP
MΩ
ELECTRICAL CHARACTERISTICS (continued)
(VDD= 3.3V, OVDD= 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, V
REFIN
= 2.048V, REFOUT connected to
REFIN through a 10kΩ resistor, V
IN
= 2V
P-P
(differential with respect to COM), CL= 10pF at digital outputs, f
CLK
= 105MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical
values are at T
A
= +25°C.)
SYMBOL
REFOUT
MIN TYP MAX
500
400
±0.25
2.048
±1%
1.25
2.048
2.012
0.988
V
/ 2
DD
0.98 1.024 1.07
>50
MAX1449
10-Bit, 105Msps, Single 3.3V, Low-Power
ADC with Internal Reference
4 _______________________________________________________________________________________
PARAMETER
CONDITIONS
UNITS
Maximum REFP, COM Source
Current
V
REFN
5mA
Maximum REFP, COM Sink
Current
V
COM
µA
Maximum REFN Source Current
µA
Maximum REFN Sink Current I
SINK
-5 mA
UNBUFFERED EXTERNAL REFERENCE (V
REFIN
= AGND, reference voltage applied to REFP, REFN, and COM)
REFP, REFN Input Resistance
R
REFP
,
R
REFN
Measured between REFP and COM and
REFN and COM
4kΩ
REFP, REFN, COM Input
Capacitance
C
IN
15 pF
Differential Reference Input
Voltage Range
∆V
REF
∆V
REF
= V
REFP
- V
REFN
V
COM Input Voltage Range V
COM
V
DD
/ 2
V
REFP Input Voltage V
REFP
V
COM
+
V
REFN Input Voltage V
REFN
V
COM
V
DIGITAL INPUTS (CLK, PD, OE)
CLK
0.8 x
Input High Threshold V
IH
PD, OE
0.8 x
V
CLK
0.2 x
Input Low Threshold V
IL
PD, OE
0.2 x
V
Input Hysteresis V
HYST
0.1 V
I
IH
VIH = VDD = OV
DD
±5µA
Input Leakage
I
IL
V
IL
= 0 ±5
Input Capacitance C
IN
5pF
ELECTRICAL CHARACTERISTICS (continued)
(VDD= 3.3V, OVDD= 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, V
REFIN
= 2.048V, REFOUT connected to
REFIN through a 10kΩ resistor, V
IN
= 2V
P-P
(differential with respect to COM), CL= 10pF at digital outputs, f
CLK
= 105MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical
values are at T
A
= +25°C.)
SYMBOL
MIN TYP MAX
I
SOURCE
-250
250
1.024
∆V
±10%
±10%
REF
/ 2
∆V
/ 2
REF
V
DD
V
DD
V
DD
V
DD
MAX1449
10-Bit, 105Msps, Single 3.3V, Low-Power
ADC with Internal Reference
_______________________________________________________________________________________ 5
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,VIL
.
Note 4: With REFIN driven externally, REFP, COM, and REFN are left floating while powered down.
PARAMETER
CONDITIONS
UNITS
DIGITAL OUTPUTS (D9–D0)
Output Voltage Low V
OL
I
SINK
= 200µA 0.2 V
Output Voltage High V
OH
I
SOURCE
= 200µA
OV
DD
V
Three-State Leakage Current I
LEAK
OE = OV
DD
±10 µA
Three-State Output Capacitance
C
OUT
OE = OV
DD
5pF
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, fIN = 20MHz at -0.5dB FS 58 74 mA
Analog Supply Current I
VDD
Shutdown, clock idle, PD = OE = OV
DD
415µA
Operating, CL = 15pF , fIN = 20MHz at
-0.5dB FS
10 mA
Output Supply Current I
OVDD
Shutdown, clock idle, PD = OE = OV
DD
120µA
Offset
mV/V
Power Supply Rejection PSRR
Gain
%/V
TIMING CHARACTERISTICS
CLK Rise-to-Output Data Valid t
DO
Figure 6 (Note 3) 5 8 ns
OE Fall-to-Output Enable
Figure 5 10 ns
OE Rise-to-Output Disable
Figure 5 15 ns
CLK Pulse Width High t
CH
Figure 6, clock period 9.52ns
ns
CLK Pulse Width Low t
CL
Figure 6, clock period 9.52ns
ns
Wake-Up Time t
WAKE
(Note 4) 1.5 µs
ELECTRICAL CHARACTERISTICS (continued)
(VDD= 3.3V, OVDD= 2V, 0.1µF and 1µF capacitors from REFP, REFN, and COM to GND, V
REFIN
= 2.048V, REFOUT connected to
REFIN through a 10kΩ resistor, V
IN
= 2V
P-P
(differential with respect to COM), CL= 10pF at digital outputs, f
CLK
= 105MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥ +25°C guaranteed by production test, < +25°C guaranteed by design and characterization; typical
values are at T
A
= +25°C.)
SYMBOL
MIN TYP MAX
- 0.2
±0.1
±0.1
t
ENABLE
t
DISABLE
4.76
±0.47
4.76
±0.47
Typical Operating Characteristics
(VDD= 3.3V, OVDD= 2.0V, internal reference, differential input at -0.5dB FS, f
CLK
= 106.2345MHz, CL≈ 10pF, TA= +25°C, unless
otherwise noted.)
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
02010 30 40 50 60
FFT PLOT (fIN = 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
02010 30 40 50 60
MAX1449 toc02
FFT PLOT (fIN = 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
02010 30 40 50 60
MAX1449 toc03
FFT PLOT (fIN = 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
02010 30 40 50 60
MAX1449 toc04
FFT PLOT (fIN = 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
02010 30 40 50 60
MAX1449 toc05
FFT PLOT (fIN = 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
02010 30 40 50 60
MAX1449 toc06
TWO-TONE INTERMODULATION
(8192-POINT IMD, DIFFERENTIAL INPUT)
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f1 = 38MHz AT -6.5dB FS
f
2
= 42MHz AT -6.5dB FS
2ND-ORDER IMD
3RD-ORDER IMD
f
1
f
2
80
50
110100
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
110100
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
110100
TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT FREQUENCY
-74
MAX1449 toc09
ANALOG INPUT FREQUENCY (MHz)
-68
-62
-56
DIFFERENTIAL
SINGLE ENDED
MAX1449
10-Bit, 105Msps, Single 3.3V, Low-Power
ADC with Internal Reference
6 _______________________________________________________________________________________
SINAD (dB)
60
50
110100
SIGNAL-T0-NOISE + DISTORTION
vs. ANALOG INPUT FREQUENCY
52
MAX1449 toc10
ANALOG INPUT FREQUENCY (MHz)
54
56
58
DIFFERENTIAL
SINGLE-ENDED
-8
1 100010010
FULL-POWER INPUT BANDWIDTH vs.
ANALOG INPUT FREQUENCY, SINGLE ENDED
6
0
-6
4
2
MAX1449 toc11
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
-2
-4
-8
1100010010
SMALL-SIGNAL INPUT BANDWIDTH vs.
ANALOG INPUT FREQUENCY, SINGLE ENDED
6
0
-6
4
2
MAX1449 toc12
ANALOG INPUT FREQUENCY (MHz)
U(d)
-2
-4
VIN = 100mVp-p
50
60
55
70
65
75
80
-12 -6-9 -3 0
SPURIOUS-FREE DYNAMIC RANGE
vs. ANALOG INPUT POWER (f
IN
= 19MHz)
MAX1449 toc13
ANALOG INPUT POWER (dB FS)
SFDR (dBc)
40
45
55
50
60
65
SIGNAL-TO-NOISE RATIO
vs. ANALOG INPUT POWER (f
IN
= 19MHz)
MAX1449 toc14
ANALOG INPUT POWER (dB FS)
SNR (dB)
-12 -6-9 -3 0
-80
-70
-75
-60
-65
-55
-12 -6-9 -3 0
TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT POWER (f
IN
= 19MHz)
MAX1449 toc15
ANALOG INPUT POWER (dB FS)
THD (dBc)
-50
40
45
55
50
60
65
SIGNAL-TO-NOISE + DISTORTION
vs. ANALOG INPUT POWER (f
IN
= 19MHz)
MAX1449 toc16
ANALOG INPUT POWER (dB FS)
SINAD (dB)
-12 -6-9 -3 0
64
68
76
72
80
84
-40 10-15 35 60 85
SPURIOUS-FREE DYNAMIC RANGE
vs. TEMPERATURE
MAX1449 toc17
TEMPERATURE (°C)
SFDR (dBc)
fIN = 26.1696MHz
50
54
62
58
66
70
-40 10-15 35 60 85
SIGNAL-TO-NOISE vs. TEMPERATURE
MAX1449 toc18
TEMPERATURE (°C)
SNR (dB)
fIN = 26.1696MHz
Typical Operating Characteristics (continued)
(VDD= 3.3V, OVDD= 2.0V, internal reference, differential input at -0.5dB FS, f
CLK
= 106.2345MHz, CL≈ 10pF, TA= +25°C, unless
otherwise noted.)
MAX1449
10-Bit, 105Msps, Single 3.3V, Low-Power
ADC with Internal Reference
_______________________________________________________________________________________ 7
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