MAXIM MAX1420 Technical data
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.
General Description
The MAX1420, 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 fullydifferential signal path. The MAX1420 is optimized for
low-power, high dynamic performance applications in
imaging and digital communications. The converter
operates from a single 3.3V supply, and consumes only
221mW. 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 full-scale range of the ADC. A flexible reference
structure accommodates an internal reference, or
externally applied buffered or unbuffered reference for
applications that require increased accuracy and a different input voltage range.
In addition to low operating power, the MAX1420 features two power-down modes: reference power-down
and shutdown mode. In reference power-down, the
internal bandgap reference is deactivated, which
results in a typical 2mA supply current reduction. A full
shutdown mode is available to maximize power savings
during idle periods.
The MAX1420 provides parallel, offset binary, CMOScompatible three-state outputs.
The MAX1420 is available in a 7mm x 7mm x 1.4mm,
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 range.
Pin-compatible lower speed versions of the MAX1420
are also available. Please refer to the MAX1421 data
sheet for 40Msps and the MAX1422 data sheet for
20Msps.
________________________Applications
Medical Ultrasound Imaging
CCD Pixel Processing
IR Focal Plane Arrays
Radar
IF and Baseband Digitization
Features
♦ 3.3V Single Power Supply
♦ 67dB SNR at f
IN
= 5MHz
♦ 66dB SNR at fIN= 15MHz
♦ Internal 2.048V Precision Bandgap Reference
♦ Differential, Wideband Input T/H Amplifier
♦ Power-Down Modes
218mW (Reference Shutdown Mode)
10µW (Shutdown Mode)
♦ Space-Saving 48-Pin TQFP Package
MAX1420
12-Bit, 60Msps, 3.3V, Low-Power ADC
with Internal Reference
________________________________________________________________ Maxim Integrated Products 1
D9
D8
D7
D6
DV
DD
DV
DD
DGND
DGND
D5
D4
D3
D2
AGND
AV
DD
AV
DD
AGND
AGND
INP
INN
AGND
AGND
AV
DD
AV
DD
AGND
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
48-TQFP
MAX1420
AGND
AV
DDAVDD
AGND
CLK
CLK
AGND
AV
DD
DV
DD
DGND
D0
D1
1314151617181920212223
24
4847464544434241403938
37
AGND
AVDDCML
REFN
REFP
REFIN
AVDDAGNDPDOE
D11
D10
Pin Configuration
19-1981; Rev 1; 5/04
EVALUATION KIT
AVAILABLE
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX1420CCM
0°C to +70°C 48 TQFP
MAX1420ECM -40°C to +85°C 48 TQFP
Functional diagram appears at end of data sheet.
MAX1420
12-Bit, 60Msps, 3.3V, Low-Power ADC
with Internal Reference
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, VIN= ±1.024V, differential input voltage at -0.5dBFS, internal reference, f
CLK
=
62.5MHz (50% duty cycle); digital output load C
L
= 10pF, ≥+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.
PARAMETER
CONDITIONS MIN
UNITS
DC ACCURACY
Resolution RES 12 Bits
TA = +25°C, no missing codes -1 1
Differential Nonlinearity DNL
TA = T
MIN
to T
MAX
LSB
Integral Nonlinearity INL TA = T
MIN
to T
MAX
±2
LSB
Mid-scale Offset MSO -3 .75 3
%FSR
Mid-scale Offset Temperature
Coefficient
3 x 10
-4
%/°C
Internal reference (Note 1) -5
5
%FSR
E xter nal r efer ence ap p l i ed to RE FIN
( N ote 2)
-5
5
Gain Error GE
E xter nal r efer ence ap p li ed to RE FP ,
CML, and REFN (Note 3)
-1.5 1.5
Gain Error Temperature
Coefficient
GETC
External reference applied to REFP, CML,
and REFN (Note 3)
100 x 106
%/°C
DYNAMIC PERFORMANCE (f
CLK
= 60MHz, 4096-point FFT)
fIN = 5MHz 67
Signal-to-Noise Ratio SNR
f
IN
= 15MHz, TA =+25°C 62 66
dB
fIN = 5MHz 72
Spurious-Free Dynamic Range SFDR
f
IN
= 15MHz, TA =+25°C 64 72
dBc
fIN = 5MHz -70
Total Harmonic Distortion THD
f
IN
= 15MHz, TA =+25°C -69 -62
dBc
fIN = 5MHz
Signal-to-Noise and Distortion SINAD
f
IN
= 15MHz, TA =+25°C 58.5 63
dB
fIN = 5MHz
Effective Number of Bits ENOB
f
IN
= 15MHz
Bits
Two-Tone
Intermodulation Distortion
IMD
f
IN1
= 11.566036MHz,
f
IN2
= 13.4119138MHz (Note 4)
-74
dBc
AVDD, DVDDto AGND..............................................-0.3V to +4V
DV
DD
, AVDDto 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 (DV
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFP (derate 21.7mW/°C above +70°C)........1789mW
Operating Temperature Ranges
MAX1420CCM ....................................................0°C to +70°C
MAX1420ECM .................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
SYMBOL
TYP MAX
±0.5
MSOTC
±0.1
±0.2
64.5
10.4
10.2
MAX1420
12-Bit, 60Msps, 3.3V, Low-Power ADC
with Internal Reference
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, VIN= ±1.024V, differential input voltage at -0.5dBFS, internal reference, f
CLK
=
62.5MHz (50% duty cycle); digital output load C
L
= 10pF, ≥+25°C guaranteed by production test, <+25°C guaranteed by design and
characterization. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS MIN
Differential Gain DG ±1%
Differential Phase DP
ANALOG INPUTS (INP, INN, CML)
Input Resistance R
IN
Either input to ground 22 kΩ
Input Capacitance C
IN
Either input to ground 4 pF
Common-Mode Input Level
(Note 5)
V
CML
V
Common-Mode Input Voltage
Range (Note 5)
V
CMVR
V
Differential Input Range V
IN
V
INP
- V
INN
(Note 6)
V
Small-Signal Bandwidth BW
-3dB
(Note 7) 400
Large-Signal Bandwidth
(Note 7) 150
Overvoltage Recovery OVR 1.5 x FS input 1
Clock
INTERNAL REFERENCE (REFIN bypassed with 0.22µF in parallel with 1nF)
Common-Mode Reference
Voltage
V
CML
At CML
V
Positive Reference Voltage V
REFP
At REFP
V
CML
V
Negative Reference Voltage V
REFN
At REFN
V
Differential Reference Voltage V
DIFF
(Note 6) 1.024 ±5% V
Differential Reference
Temperature Coefficient
REFTC
EXTERNAL REFERENCE (V
REFIN
= 2.048V)
REFIN Input Resistance R
IN
(Note 8) 5 kΩ
REFIN Input Capacitance C
IN
10 pF
REFIN Reference Input Voltage V
REFIN
V
Differential Reference Voltage V
DIFF
(Note 6)
0.92
x
1.08
x
V
EXTERNAL REFERENCE (V
REFIN
= 0, reference voltage applied to REFP, REFN, and CML)
REFP, REFN, CML Input Current
I
IN
-200 200 µA
REFP, REFN, CML Input
Capacitance
C
IN
15 pF
SYMBOL
TYP MAX UNITS
±0.25 Degrees
V
AVDD
x
0.5
V
CML
± 5%
±V
DIFF
V
AVDD
_
0.5
+ 0.512
V
CML
- 0.512
FPBW
-3dB
±100 ppm/°C
MHz
MHz
cycles
V
REFIN
±10%
V
/2
REFIN
/2
2.048
V
REFIN
/2
MAX1420
12-Bit, 60Msps, 3.3V, Low-Power ADC
with Internal Reference
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, VIN= ±1.024V, differential input voltage at -0.5dBFS, internal reference, f
CLK
=
62.5MHz (50% duty cycle); digital output load C
L
= 10pF, ≥+25°C guaranteed by production test, <+25°C guaranteed by design and
characterization. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS MIN
TYP
MAX
UNITS
Differential Reference Voltage
Range
V
DIFF
(Note 6)
V
CML Input Voltage Range V
CML
1.65
V
REFP Input Voltage Range V
REFP
V
CML
+
V
REFN Input Voltage Range V
REFN
V
CML
V
DIGITAL INPUTS (CLK, CLK, PD, OE)
Input Logic High V
IH
0.7
x
V
Input Logic Low V
IL
0.3
x
V
CLK, CLK
PD -20 20Input Current
OE -20 20
µA
Input Capacitance 10 pF
DIGITAL OUTPUTS (D0–D11)
Output Logic High V
OH
IOH = 200µA
- 0.5
V
Output Logic Low V
OL
IOL = -200µA 0 0.5 V
Three-State Leakage -10 10 µA
Three-State Capacitance 2pF
POWER REQUIREMENTS
Analog Supply Voltage V
AVDD
3.135 3.3
V
Digital Supply Voltage V
DVDD
2.7 3.3
V
Analog Supply Current I
AVDD
67 78 mA
Analog Supply Current with
Internal Reference in Shutdown
V
REFIN
= 0 66 76 mA
Analog Shutdown Current PD = D
VDD
10 20 µA
Digital Supply Current I
DVDD
8mA
Digital Shutdown Current PD = V
DVDD
20 µA
Power Dissipation P
DISS
Analog power dissipation 221 258 mW
1.024
±10%
±10%
V
DIFF
V
DIFF
±330
/2
/2
V
DVDD
V
DVDD
V
DVDD
V
DVDD
3.465
3.63
MAX1420
12-Bit, 60Msps, 3.3V, Low-Power ADC
with Internal Reference
_______________________________________________________________________________________ 5
Note 1: Internal reference, REFIN bypassed to AGND with a combination of 0.22µF in parallel with 1nF capacitor.
Note 2: External 2.048V reference applied to REFIN.
Note 3: Internal reference disabled. V
REFIN
= 0, V
REFP
= 2.162V, V
CML
= 1.65V, and V
REFN
= 1.138V.
Note 4: IMD is measured with respect to either of the fundamental tones.
Note 5: Specifies the common-mode range of the differential input signal supplied to the MAX1420.
Note 6: V
DIFF
= V
REFP
- V
REFN
.
Note 7: Input bandwidth is measured at a -3dB level.
Note 8: V
REFIN
is internally biased to 2.048V through a 10kΩ resistor.
Note 9: Measured as the ratio of the change in mid-scale offset voltage for a ±5% change in V
AVDD
, using the internal reference.
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, VIN= ±1.024V, differential input voltage at -0.5dBFS, internal reference, f
CLK
=
62.5MHz (50% duty cycle); digital output load C
L
= 10pF, ≥+25°C guaranteed by production test, <+25°C guaranteed by design and
characterization. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS MIN
Power Dissipation In Shutdown P
DISS
PD = V
DVDD
10 µW
Power-Supply Rejection Ratio PSRR (Note 9) ±1
TIMING CHARACTERISTICS
Maximum Clock Frequency f
CLK
60
Clock High t
CH
Figure 6, clock period 16.667ns
ns
Clock Low t
CL
Figure 6, clock period 16.667ns
ns
Pipeline Delay (Latency) Figure 6 7
Clock
Aperture Delay t
AD
Figure 10 2 ns
Aperture Jitter t
AJ
Figure 10 2 ps
Data Output Delay t
OD
Figure 6 5 10 14 ns
Bus Enable Time t
BE
Figure 5 5 ns
Bus Disable Time t
BD
Figure 5 5 ns
Typical Operating Characteristics
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, VIN= ±1.024V, differential input drive, AIN= -0.5dBFS, f
CLK
= 60.006MHz (50% duty
cycle), digital output load C
L
= 10pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
-120
-80
-100
-40
-60
-20
0
030
FFT PLOT (8192-POINT DATA RECORD)
MAX1420 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
10 1552025
HD2
HD3
fIN = 5.5449MHz
-120
-80
-100
-40
-60
-20
0
030
FFT PLOT (8192-POINT DATA RECORD)
MAX1420 toc02
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
10 1552025
HD2
HD3
fIN = 13.4119MHz
-120
-80
-100
-40
-60
-20
0
030
FFT PLOT (8192-POINT DATA RECORD)
MAX1420 toc03
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
10 1552025
HD2
HD3
fIN = 37.7012MHz
SYMBOL
TYP MAX UNITS
8.33
8.33
mV/V
MHz
cycles
MAX1420
12-Bit, 60Msps, 3.3V, Low-Power ADC
with Internal Reference
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
AVDD
= V
DVDD
= 3.3V, AGND = DGND = 0, VIN= ±1.024V, differential input drive, AIN= -0.5dBFS, f
CLK
= 60.006MHz (50% duty
cycle), digital output load CL= 10pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
-120
-80
-100
-40
-60
-20
0
030
TWO-TONE IMD PLOT
(8192-POINT DATA RECORD)
MAX1420 toc04
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
10 1552025
f
IN1
f
IN1
= 11.566MHz
f
IN2
= 13.4119MHz
A
IN1
= A
IN2
= -6.5dB FS
f
IN2
IMD3
IMD2
IMD2
IMD3
85
45
1 10 100
SPURIOUS-FREE DYNAMIC RANGE
vs. ANALOG INPUT FREQUENCY
53
MAX1420 toc08
ANALOG INPUT FREQUENCY (MHz)
SFDR (dBc)
61
69
77
MAX1420 toc09
-10
0
20
10
50
60
40
30
70
SNR (dB)
-70 -50 -40-60
-30
-20 -10 0
ANALOG INPUT POWER (dB FS)
SIGNAL-TO-NOISE RATIO
vs. INPUT POWER (f
IN
= 15MHz)
-80
-60
-70
-40
-50
-30
-20
MAX1420 toc11
THD (dBc)
TOTAL HARMONIC DISTORTION
vs. INPUT POWER (f
IN
= 15MHz)
-70 -50 -40-60
-30
-20 -10 0
ANALOG INPUT POWER (dB FS)
20
40
30
60
50
70
80
MAX1420 toc12
SFDR (dBc)
SPURIOUS-FREE DYNAMIC RANGE
vs. INPUT POWER (f
IN
= 15MHz)
-70 -50 -40-60
-30
-20 -10 0
ANALOG INPUT POWER (dB FS)
-50
-80
1 10 100
TOTAL HARMONIC DISTORTION
vs. ANALOG INPUT FREQUENCY
-74
MAX1420 toc07
ANALOG INPUT FREQUENCY (MHz)
THD (dBc)
-68
-62
-56
MAX1420 toc10
-10
0
80
SINAD (dB)
-70 -50 -40-60
-30
-20 -10 0
ANALOG INPUT POWER (dB FS)
SIGNAL-TO-NOISE + DISTORTION
vs. INPUT POWER (f
IN
= 15MHz)
10
40
30
20
70
60
50
70
50
110100
SIGNAL-TO-NOISE RATIO
vs. ANALOG INPUT FREQUENCY
54
MAX1420 toc05
ANALOG INPUT FREQUENCY (MHz)
SNR (dB)
58
62
66
70
50
110100
SIGNAL-TO-NOISE + DISTORTION
vs. ANALOG INPUT FREQUENCY
54
MAX1420 toc06
ANALOG INPUT FREQUENCY (MHz)
SINAD (dB)
58
62
66
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