19-1598 Rev 1; 7/11
10-Bit, 10Msps ADC
General Description
The MAX1426 10-bit, monolithic analog-to-digital con-
verter (ADC) is capable of a 10Msps sampling rate. This
device features an internal track-and-hold (T/H) amplifier
for excellent dynamic performance; at the same time, it
minimizes the number of external components. Low
input capacitance of only 8pF minimizes input drive
requirements. A wide input bandwidth (up to 150MHz)
makes this device suitable for digital RF/IF downconvert-
er applications employing undersampling techniques.
The MAX1426 employs a differential pipelined architec-
ture with a wideband T/H amplifier to maximize through-
put while limiting power consumption to only 156mW.
The MAX1426 generates an internal +2.5V reference
that supplies three additional reference voltages
(+3.25V, +2.25V, and +1.25V). These reference volt-
ages provide a differential input range of +2V to -2V.
The analog inputs are biased internally to correct the
DC level, eliminating the need for external biasing on
AC-coupled applications.
A separate +3V digital logic supply input allows for
separation of digital and analog circuitry. The output
data is in two’s complement format. The MAX1426 is
available in the space-saving 28-pin SSOP package.
For a pin-compatible version at a higher data rate, refer
to the MAX1424 or MAX1425
Features
o
Differential Inputs for High Common-Mode
Noise Rejection
o
61dB Signal-to-Noise Ratio (at f
IN
= 2MHz)
o
Internal +2.5V Reference
o
150MHz Input Bandwidth
o
Wide ±2V Input Range
o
Low Power Consumption: 156mW
o
Separate Digital Supply Input for 3V Logic
Compatibility
o
Single +5V Operation Possible
MAX1426
Ordering Information
PART
MAX1426CAI+
MAX1426EAI+
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Devices are also available in a tape-and-reel package.
Specify tape and reel by adding “T” to the number when order-
ing.
Applications
Medical Ultrasound Imaging
CCD Pixel Processing
IR Focal Plane Array
Radar
IF and Baseband Digitization
Set-Top Boxes
TOP VIEW
+
AGND 1
AV
DD
2
REFP 3
REFIN 4
Pin Configuration
28 D0
27 D1
26 D2
25 D3
24 D4
Functional Diagram
CLK
INTERFACE
INP
T/H
INN
REF SYSTEM +
BIAS
PIPELINE ADC
AV
DD
AGND
REFN 5
CML 6
AGND 7
AV
DD
8
INP 9
MAX1426
23 DGND
22 DV
DD
21 DGND
20 DV
DD
19 D5
18 D6
17 D7
16 D8
15 D9
MAX1426
OUTPUT
DRIVERS
D9–D0
DV
DD
DGND
INN 10
CMLP 11
CMLN 12
CLK 13
OE/PD 14
REF
REFIN REFP
CML REFN
OE/PD
SSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
10-Bit, 10Msps ADC
MAX1426
ABSOLUTE MAXIMUM RATINGS
AV
DD
to AGND ........................................................ -0.3V to +6V
DV
DD
to DGND ....................................................... -0.3V to +6V
AV
DD
to DGND ........................................................ -0.3V to +6V
DGND to AGND ................................................................. ±0.3V
REFP, REFIN, REFN, CMLN, CMLP,
CML, INP, INN .....................(V
AGND
- 0.3V) to (V
AVDD
+ 0.3V)
CLK,
OE/PD,
D0–D9 ...............(V
DGND
- 0.3V) to (V
DVDD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derated 9.5mW/°C above +70°C) .........762mW
Operating Temperature Ranges
MAX1426CAI ..................................................... 0°C to +70°C
MAX1426EAI................................................... -40°C to +85°C
Maximum Junction Temperature .................................... +150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°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
(V
AVDD
= V
CMLP
= +5V, V
DVDD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0V, internal reference, digital output loading 35pF, f
CLK
=
10MHz (50% duty cycle), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ACCURACY
Resolution
Differential Nonlinearity
Integral Nonlinearity
No Missing Codes
Midscale Offset
MSO
RES
DNL
INL
Guaranteed monotonic
(Note 1)
Internal reference (Note 1)
Gain Error
GE
External reference (REFIN) (Note 2)
External reference (REFP, CML, REFN)
(Note 3)
Power-Supply Rejection Ratio
Signal-to-Noise Ratio
Spurious-Free Dynamic Range
Total Harmonic Distortion
(first five harmonics)
Signal-to-Noise and Distortion
PSRR
SNR
SFDR
THD
SINAD
(Note 4)
f = 2MHz
f = 2MHz
f = 2MHz
f = 2MHz
58
DYNAMIC PERFORMANCE
(A
IN
= -1.0dBFS)
60
69
61
72
-70
60
-67
dB
dB
dB
dB
-3
-10
-5
-5
-5
±1.0
±5
±2
±3
±2
3
10
5
5
+5
mV/V
%FSR
%FSR
-1
-1.5
±0.3
10
1
1.5
Bits
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
10-Bit, 10Msps ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
CMLP
= +5V, V
DVDD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0V, internal reference, digital output loading 35pF, f
CLK
=
10MHz (50% duty cycle), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Effective Number of Bits
Intermodulation Distortion
ANALOG INPUT
(INP, INN, CML)
Input Resistance
Input Capacitance
Input Common-Mode Voltage
Range
Differential Input Range
Small-Signal Bandwidth
Large-Signal Bandwidth
Input Resistance
Input Capacitance
Differential Reference
Input Current
Input Capacitance
REFP Input Range
CML Input Range
REFN Input Range
REFERENCE OUTPUTS
(REFP, CML, REFN; external +2.5V reference)
Positive Reference Voltage
Common-Mode Reference
Voltage
Negative Reference Input
Voltage
Differential Reference
Differential Reference
Temperature Coefficient
V
REFP
V
CML
V
REFN
V
REFP
- V
REFN,
T
A
= +25°C
1.9
3.25
2.25
1.25
2.0
±50
2.1
V
V
V
V
ppm/°C
I
IN
C
IN
R
IN
C
IN
V
CMVR
DR
SSBW
LSBW
R
IN
C
IN
Either input to ground
Either input to ground
CML (Note 6)
V
INP
- V
INN
(Note 7)
(Note 7)
REFIN (Note 8)
REFIN
V
REFP
- V
REFN
REFP, CML, REFN
REFP, CML, REFN
-325
15
3.25
±10%
2.25
±10%
1.25
±10%
6.5
10
2.0
+325
3.5
8
2.25
±10%
±2
400
150
kΩ
pF
V
V
MHz
MHz
kΩ
pF
V
µA
pF
V
V
V
SYMBOL
ENOB
IMD
f = 2MHz
f1 = 1.98MHz, f2 = 2.00MHz
(-7dB FS, each tone) (Note 5)
CONDITIONS
MIN
9.3
TYP
9.7
-70
MAX
UNITS
Bits
dBc
MAX1426
REFERENCE
(V
REFIN
= 0; REFP, REFN, CML applied externally)
_______________________________________________________________________________________
3
10-Bit, 10Msps ADC
MAX1426
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
CMLP
= +5V, V
DVDD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0V, internal reference, digital output loading 35pF, f
CLK
=
10MHz (50% duty cycle), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Positive Reference
Common-Mode Reference
Voltage
Negative Reference
Differential Reference
Differential Reference
Temperature Coefficient
POWER SUPPLY
Analog Supply Voltage
Digital Supply Voltage
Analog Supply Current
Analog Supply Current with
Internal Reference in Shutdown
Analog Shutdown Current
Digital Supply Current
Digital Shutdown Current
Power Dissipation
DIGITAL INPUTS
(CLK,
OE/PD)
V
DVDD
> 4.75V
Input Logic High
V
IH
V
DVDD
< 4.75V
V
DVDD
> 4.75V
Input Logic Low
V
IL
V
DVDD
< 4.75V
V
DVDD
= 5.25V
I
CLK
I
OE/PD
-10
-20
10
V
DVDD
- 0.5
-10
10
2.4
0.7
×
V
DVDD
0.8
0.3
×
V
DVDD
10
20
V
µA
µA
pF
V
PD
I
DVDD
V
AVDD
V
DVDD
I
AVDD
REFIN = AGND
OE/PD
= DV
DD
V
DVDD
= 3.3V
V
DVDD
= 5.0V
OE/PD
= DV
DD
4.75
2.7
5.00
3.3
29
25
0.6
3.3
5.3
40
156
5.25
5.5
38
35
1
6
8
150
210
V
V
mA
mA
mA
mA
µA
mW
SYMBOL
V
REFP
V
CML
V
REFN
(Note 1)
(Note 1)
(Note 1)
V
REFP
- V
REFN,
T
A
= +25°C
1.8
CONDITIONS
MIN
TYP
3.25
2.25
1.25
2
±150
2.2
MAX
UNITS
V
V
V
V
ppm/°C
REFERENCE OUTPUT
(REFP, CML, REFN; internal +2.5V reference)
Input Current Leakage
Input Capacitance
DIGITAL OUTPUTS
(D0–D9)
Output Logic High
Output Logic Low
Three-State Leakage
Three-State Capacitance
V
OH
V
OL
I
OH
= -200µA, V
DVDD
= 2.7V
I
OL
= 200µA, V
DVDD
= 2.7V
V
DVDD
= 5.25V,
OE/PD
= DV
DD
OE/PD
= DV
DD
V
DV
DD
V
V
µA
pF
0.5
10
4
_______________________________________________________________________________________
10-Bit, 10Msps ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
CMLP
= +5V, V
DVDD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0V, internal reference, digital output loading 35pF, f
CLK
=
10MHz (50% duty cycle), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
TIMING CHARACTERISTICS
Conversion Rate
Clock Frequency
Clock High
Clock Low
Pipeline Delay (Latency)
Aperture Delay
Aperture Jitter
Data Output Delay
Bus Enable
Bus Disable
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
t
AD
t
AJ
t
OD
5
CONV
f
CLK
t
CH
t
CL
Figure 4
Figure 4
40
40
50
50
5.5
5
7
20
10
10
25
20
20
0.1
10
10
60
60
MHz
MHz
ns
ns
cycles
ns
ps
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1426
Internal reference, REFIN bypassed to AGND with a 0.1µF capacitor.
External +2.5V reference applied to REFIN.
Internal reference disabled. V
REFIN
= 0, V
REFP
= 3.25V, V
CML
= 2.25V, and V
REFN
= 1.25V.
Measured as the ratio of the change in midscale offset voltage for a ±5% change in V
AVDD
using the internal reference.
IMD is measured with respect to either of the fundamental tones.
Specifies the common-mode range of the differential input signal supplied to the MAX1426.
Defined as the input frequency at which the fundamental component of the output spectrum is attenuated by 3dB.
V
REFIN
is internally biased to +2.5V through a 5kΩ resistor.
_______________________________________________________________________________________
5
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