Maxim MAX1426EAI, MAX1426CAI Datasheet
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General Description
The MAX1426 10-bit, monolithic analog-to-digital converter (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 downconverter applications employing undersampling techniques.
The MAX1426 employs a differential pipelined architecture with a wideband T/H amplifier to maximize throughput 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 voltages 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
Applications
Medical Ultrasound Imaging
CCD Pixel Processing
IR Focal Plane Array
Radar
IF and Baseband Digitization
Set-Top Boxes
Features
♦ Differential Inputs for High Common-Mode
Noise Rejection
♦ 61dB Signal-to-Noise Ratio (at f
IN
= 2MHz)
♦ Internal +2.5V Reference
♦ 150MHz Input Bandwidth
♦ Wide ±2V Input Range
♦ Low Power Consumption: 156mW
♦ Separate Digital Supply Input for 3V Logic
Compatibility
♦ Single +5V Operation Possible
MAX1426
10-Bit, 10Msps ADC
________________________________________________________________ Maxim Integrated Products 1
Functional Diagram
19-1598 Rev 0; 1/00
PART
MAX1426CAI
MAX1426EAI -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
28 SSOP
28 SSOP
Pin Configuration
Ordering Information
CLK
INTERFACE
INP
INN
T/H
REF
PIPELINE ADC
REF SYSTEM +
REFIN REFP CML REFN OE/PD
BIAS
AV
MAX1426
OUTPUT
DRIVERS
DD
AGND
D9–D0
DV
DD
DGND
TOP VIEW
AGND
AV
REFP
REFIN
REFN
CML
AGND
AV
INP
INN
CMLP
CMLN
CLK
OE/PD
1
2
DD
3
4
5
MAX1426
6
7
8
DD
9
10
11
12
13
14
SSOP
28
D0
27
D1
26
D2
25
D3
24
D4
23
DGND
22
DV
DD
21
DGND
20
DV
DD
19
D5
18
D6
17
D7
16
D8
15
D9
MAX1426
10-Bit, 10Msps ADC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
AV
DD
= V
CMLP
= +5V, V
DV
DD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0, 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 TA= +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.
AVDDto AGND ........................................................ -0.3V to +6V
DVDDto DGND ....................................................... -0.3V to +6V
AVDDto DGND........................................................ -0.3V to +6V
DGND to AGND ................................................................. ±0.3V
REFP, REFIN, REFN, CMLN, CMLP,
CML, INP, INN .....................(V
AGND
- 0.3V) to (V
AV
DD
+ 0.3V)
CLK, OE/PD, D0–D9 ...............(V
DGND
- 0.3V) to (V
DV
DD
+ 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
58 60
f = 2MHz
-70 -67
f = 2MHz
%FSR
%FSR
f = 2MHz
(Note 4)
External reference (REFP, CML, REFN)
(Note 3)
External reference (REFIN) (Note 2)
Guaranteed monotonic
(Note 1)
Internal reference (Note 1)
f = 2MHz
CONDITIONS
SINADSignal-to-Noise and Distortion
dBTHD
Total Harmonic Distortion
(first five harmonics)
dB
69 72
SFDRSpurious-Free Dynamic Range
dB
60 61
SNRSignal-to-Noise Ratio
LSB
-1 1
DNLDifferential Nonlinearity
Bits
10
RESResolution
mV/V
-5 ±2 +5
PSRRPower-Supply Rejection Ratio
-5 ±3 5
-5 ±2 5
LSB
-1.5 ±0.3 1.5
INLIntegral Nonlinearity
No Missing Codes
-3 ±1.0 3
MSOMidscale Offset
-10 ±5 10
GEGain Error
UNITSMIN TYP MAXSYMBOLPARAMETER
dB
ACCURACY
DYNAMIC PERFORMANCE (V
INP
- V
INN
= +2V to -2V)
MAX1426
10-Bit, 10Msps ADC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
AV
DD
= V
CMLP
= +5V, V
DV
DD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0, 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 TA= +25°C.)
f = 2MHz
CONDITIONS
Bits
9.3 9.7
ENOBEffective Number of Bits
UNITSMIN TYP MAXSYMBOL PARAMETER
f1 = 1.98MHz, f2 = 2.00MHz
(-7dB FS, each tone) (Note 5)
dBc
-70
IMDIntermodulation Distortion
(Note 7)
(Note 7)
V
INP
- V
INN
CML (Note 6)
Either input to ground
Either input to ground
MHz150LSBWLarge-Signal Bandwidth
MHz400SSBWSmall-Signal Bandwidth
V±2DRDifferential Input Range
V
2.25
±10%
V
CMVR
Input Common-Mode Voltage
Range
pF
8
C
IN
Input Capacitance
kΩ
3.5
R
IN
Input Resistance
REFP, CML, REFN
REFP, CML, REFN
V
REFP
- V
REFN
REFIN
REFIN (Note 8)
V
1.25
±10%
REFN Input Range
V
2.25
±10%
CML Input Range
V
3.25
±10%
REFP Input Range
pF
15
C
IN
Input Capacitance
µA
-325 +325
I
IN
Input Current
V
2.0
Differential Reference
pF
10
C
IN
Input Capacitance
kΩ
6.5
R
IN
Input Resistance
V
REFP
- V
REFN, TA
= +25°C V
1.9 2.0 2.1
Differential Reference
V
1.25
V
REFN
Negative Reference Input
Voltage
V
2.25
V
CML
Common-Mode Reference
Voltage
V
3.25
V
REFP
Positive Reference Voltage
ppm/°C±50
Differential Reference
Temperature Coefficient
REFERENCE OUTPUTS (REFP, CML, REFN; external +2.5V reference)
REFERENCE (V
REFIN
= 0; REFP, REFN, CML applied externally)
ANALOG INPUT (INP, INN, CML)
MAX1426
10-Bit, 10Msps ADC
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
AV
DD
= V
CMLP
= +5V, V
DV
DD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0, 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 TA= +25°C.)
(Note 1)
V
3.25
V
REFP
Positive Reference
(Note 1) V
2.25
V
CML
Common-Mode Reference
Voltage
OE/PD = DV
DD
V
DV
DD
= 5.25V, OE/PD = DV
DD
IOL= 200µA, V
DV
DD
= 2.7V
IOH= -200µA, V
DV
DD
= 2.7V
V
REFP
- V
REFN
,
TA = +25°C
V
DV
DD
< 4.75V
V
DV
DD
> 4.75V
OE/PD = DV
DD
V
DV
DD
= 5.0V
REFIN = AGND
OE/PD = DV
DD
V
DV
DD
< 4.75V
V
DV
DD
= 3.3V
V
DV
DD
> 4.75V
CONDITIONS
pFThree-State Capacitance
µAThree-State Leakage
VV
OL
Output Logic Low
VV
OH
Output Logic High
pFInput Capacitance
0.3 ×
V
DV
DD
V
0.8
V
IL
Input Logic Low
0.7 ×
V
DV
DD
V
2.4
V
IH
Input Logic High
ppm/°C
±150
Differential Reference
Temperature Coefficient
V
1.8 2 2.2
Differential Reference
mW
156 210
PDPower Dissipation
µA
40 150
Digital Shutdown Current
5.3 8
mA
25 35
Analog Supply Current with
Internal Reference in Shutdown
mA
0.6 1
Analog Shutdown Current
mA
3.3 6
I
DV
DD
Digital Supply Current
UNITSMIN TYP MAXSYMBOL PARAMETER
V
2.7 3.3 5.5
V
DV
DD
Digital Supply Voltage
V
4.75 5.00 5.25
V
AV
DD
Analog Supply Voltage
mA
29 38
I
AV
DD
Analog Supply Current
(Note 1) V
1.25
V
REFN
Negative Reference
V
DV
DD
= 5.25V
µA-20 20
µA-10 10
Input Current Leakage
10
V
DV
DD
V
DV
DD
- 0.5
0.5
-10 10
10
I
CLK
I
OE/PD
REFERENCE OUTPUT (REFP, CML, REFN; internal +2.5V reference)
POWER SUPPLY
DIGITAL INPUTS (CLK, OE/PD)
DIGITAL OUTPUTS (D0–D9)
MAX1426
10-Bit, 10Msps ADC
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
AV
DD
= V
CMLP
= +5V, V
DV
DD
= +3.3V, V
CMLN
= V
AGND
= V
DGND
= 0, 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 TA= +25°C.)
Note 1: Internal reference, REFIN bypassed to AGND with a 0.1µF capacitor.
Note 2: External +2.5V reference applied to REFIN.
Note 3: Internal reference disabled. V
REFIN
= 0, V
REFP
= 3.25V, V
CML
= 2.25V, and V
REFN
= 1.25V.
Note 4: Measured as the ratio of the change in midscale offset voltage for a ±5% change in V
AV
DD
using the internal reference.
Note 5: IMD is measured with respect to either of the fundamental tones.
Note 6: Specifies the common-mode range of the differential input signal supplied to the MAX1426.
Note 7: Defined as the input frequency at which the fundamental component of the output spectrum is attenuated by 3dB.
Note 8: V
REFIN
is internally biased to +2.5V through a 5kΩ resistor.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
10 20 ns
ns10 20
Bus Enable
Bus Disable
Data Output Delay ns52025t
OD
Aperture Jitter ps7t
AJ
Aperture Delay ns5t
AD
Pipeline Delay (Latency) cycles5.5
Clock Low ns40 50 60Figure 4t
CL
Clock High ns40 50 60Figure 4t
CH
Clock Frequency MHz10f
CLK
Conversion Rate MHz0.1 10CONV
TIMING CHARACTERISTICS
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