General Description
The MAX1181 is a +3V, dual 10-bit, analog-to-digital
converter (ADC) featuring fully-differential wideband
track-and-hold (T/H) inputs, driving two pipelined, nine-
stage ADCs. The MAX1181 is optimized for low-power,
high-dynamic performance applications in imaging,
instrumentation, and digital communication applica-
tions. The MAX1181 operates from a single +2.7V to
+3.6V supply, consuming only 246mW, while delivering
a typical signal-to-noise ratio (SNR) of 59dB at an input
frequency of 20MHz and a sampling rate of 80Msps.
The T/H driven input stages incorporate 400MHz (-3dB)
input amplifiers. The converters may also be operated
with single-ended inputs. In addition to low operating
power, the MAX1181 features a 2.8mA sleep mode, as
well as a 1A power-down mode to conserve power
during idle periods.
An internal +2.048V precision bandgap reference sets
the full-scale range of the ADC. A flexible reference
structure allows the use of the internal or external
reference, if desired for applications requiring
increased accuracy or a different input voltage range.
The MAX1181 features parallel, CMOS-compatible
three-state outputs. The digital output format is set to
two's complement or straight offset binary through a
single control pin. The device provides for a separate
output power supply of +1.7V to +3.6V for flexible inter-
facing. The MAX1181 is available in a 7mm
7mm, 48-
pin TQFP package, and is specified for the extended
industrial (-40C to +85C) temperature range.
Pin-compatible higher and lower speed versions of the
MAX1181 are also available. Please refer to the
MAX1180 datasheet for 105Msps, the MAX1182
datasheet for 65Msps, the MAX1183 datasheet for
40Msps, and the MAX1184 datasheet for 20Msps. In
addition to these speed grades, this family includes a
20Msps multiplexed output version (MAX1185), for
which digital data is presented time-interleaved on a
single, parallel 10-bit output port.
Applications
High Resolution Imaging
I/Q Channel Digitization
Multichannel IF Undersampling
Instrumentation
Video Application
Features
o Single +3V Operation
o Excellent Dynamic Performance:
59dB SNR at f
IN
= 20MHz
73dB SFDR at f
IN
= 20MHz
o Low Power:
82mA (Normal Operation)
2.8mA (Sleep Mode)
1A (Shutdown Mode)
o 0.02dB Gain and 0.25 Phase Matching (typ)
o Wide 1Vp-p Differential Analog Input Voltage
Range
o 400MHz, -3dB Input Bandwidth
o On-Chip +2.048V Precision Bandgap Reference
o User-Selectable Output Format--Two's
Complement or Offset Binary
o 48-Pin TQFP Package with Exposed Pad for
Improved Thermal Dissipation
o Evaluation Kit Available
MAX1181
Dual 10-Bit, 80Msps, +3V, Low-Power ADC with
Internal Reference and Parallel Outputs
________________________________________________________________ Maxim Integrated Products
1
D1A
D0A
OGND
OV
DD
OV
DD
OGND
D0B
D1B
D2B
D3B
D4B
D5B
COM
V
DD
GND
INA+
INA-
V
DD
GND
INB-
INB+
GND
V
DD
CLK
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-EP
MAX1181
GND
V
DD
GND
V
DD
T/B
SLEEP
PD
OE
D9B
D8B
D7B
D6B
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
REFN
REFP
REFIN
REFOUT
D9A
D8A
D7A
D6A
D5A
D4A
D3A
D2A
Pin Configuration
Ordering Information
19-2093; Rev 0; 7/01
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
TEMP. RANGE
PIN-PACKAGE
MAX1181ECM
-40
C to +85C
48 TQFP-EP
Functional Diagram appears at end of data sheet.
ELECTRICAL CHARACTERISTICS
(V
DD
= +3V, OV
DD
= +2.5V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through
a 10k
resistor, V
IN
= 2V
p-p
(differential w.r.t. COM), C
L
= 10pF at digital outputs (Note 5), f
CLK
= 83.333MHz (50% duty cycle), T
A
=
T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
MAX1181
Dual 10-Bit, 80Msps, +3V, Low-Power ADC with
Internal Reference and Parallel Outputs
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
INA+, INA-, INB+, INB- to GND ...............................-0.3V to V
DD
REFIN, REFOUT, REFP, REFN, CLK,
COM to GND ............................................-0.3V to (V
DD
+ 0.3V)
OE, PD, SLEEP, T/B, D9AD0A,
D9BD0B to OGND ................................-0.3V to (OV
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70C)
48-Pin TQFP (derate 12.5mW/C above +70C).........1000mW
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
= 7.47MHz
0.6
2.2
LSB
Differential Nonlinearity
DNL
f
IN
= 7.47MHz, no missing codes guaranteed
0.4
1.0
LSB
Offset Error
<
1
1.7
% FS
Gain Error
0
2
% FS
ANALOG INPUT
Differential Input Voltage Range
V
DIFF
Differential or single-ended inputs
1.0
V
Common-Mode Input Voltage
Range
V
CM
V
DD
/2
0.5
V
Input Resistance
R
IN
Switched capacitor load
25
k
Input Capacitance
C
IN
5
pF
CONVERSION RATE
Maximum Clock Frequency
f
CLK
80
MHz
Data Latency
5
Clock
Cycles
DYNAMIC CHARACTERISTICS (f
CLK
= 83.333MHz, 4096-point FFT)
f
INA or B
= 7.47MHz, T
A
= +25
C
56.5
59.5
f
INA or B
= 20MHz, T
A
= +25
C
56
59
Signal-to-Noise Ratio
SNR
f
INA or B
= 39.9MHz (Note 1)
59
dB
f
INA or B
= 7.47MHz, T
A
= +25
C
56
59
f
INA or B
= 20MHz, T
A
= +25
C
55.3
58.5
Signal-to-Noise And Distortion
(up to 5
th
harmonic)
SINAD
f
INA or B
= 39.9MHz (Note 1)
58.5
dB
f
INA or B
= 7.47MHz, T
A
= +25
C
65
75
f
INA or B
= 20MHz, T
A
= +25
C
64
73
Spurious-Free Dynamic
Range
SFDR
fINA or B
= 39.9MHz, (Note 1)
71
dBc
f
INA or B
= 7.47MHz
-76
f
INA or B
= 20MHz
-76
Third-Harmonic Distortion
HD3
f
INA or B
= 39.9MHz (Note 1)
-75
dBc
MAX1181
Dual 10-Bit, 80Msps, +3V, Low-Power ADC with
Internal Reference and Parallel Outputs
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V, OV
DD
= +2.5V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through
a 10k
resistor, V
IN
= 2V
p-p
(differential w.r.t. COM), C
L
= 10pF at digital outputs (Note 5), f
CLK
= 83.333MHz (50% duty cycle), T
A
=
T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Intermodulation Distortion
(first five odd-order IMDs)
IMD
f
INA or B
= 38.1546MHz at -6.5dB FS
f
INA or B
= 41.9532MHz at -6.5dB FS
(Note 2)
-73.5
dBc
f
INA or B
= 7.47MHz, T
A
= +25
C
-73
-64
f
INA or B
= 20MHz, T
A
= +25
C
-70
-63
Total Harmonic Distortion
(first five harmonics)
THD
f
INA or B
= 39.9MHz (Note 1)
-70
dBc
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
degrees
Output Noise
INA+ = INA- = INB+ = INB- = COM
0.2
LSB
RMS
INTERNAL REFERENCE
Reference Output Voltage
REFOUT
2.048
3%
V
Reference Temperature
Coefficient
TC
REF
60
ppm/
C
Load Regulation
1.25
mV/mA
BUFFERED EXTERNAL REFERENCE (V
REFIN
=+2.048V)
REFIN Input Voltage
V
REFIN
2.048
V
Positive Reference Output
Voltage
V
REFP
2.012
V
Negative Reference Output
Voltage
V
REFN
0.988
V
Differential Reference Output
Voltage Range
V
REF
V
REF
= V
REFP
- V
REFN
0.98
1.024
1.07
V
REFIN Resistance
R
REFIN
>50
M
Maximum REFP, COM Source
Current
I
SOURCE
>5
mA
Maximum REFP, COM Sink
Current
I
SINK
250
A
Maximum REFN Source Current
I
SOURCE
250
A
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
4
k
MAX1181
Dual 10-Bit, 80Msps, +3V, Low-Power ADC with
Internal Reference and Parallel Outputs
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Differential Reference Input
Voltage
V
REF
V
REF
= V
REFP
- V
REFN
1.024
10%
V
COM Input Voltage
V
COM
V
DD
/2
10%
V
REFP Input Voltage
V
REFP
V
COM
+
V
REF
/2
V
REFN Input Voltage
V
REFN
V
COM
-
V
REF
/2
V
DIGITAL INPUTS (CLK, PD,
OE, SLEEP, T/B)
CLK
0.8 x
V
DD
Input High Threshold
V
IH
PD, OE, SLEEP, T/B
0.8 x
OV
DD
V
CLK
0.2 x
V
DD
Input Low Threshold
V
IL
PD, OE, SLEEP, T/B
0.2 x
OV
DD
V
Input Hysteresis
V
HYST
0.1
V
I
IH
V
IH
= OV
DD
or V
DD
(CLK)
5
Input Leakage
I
IL
V
IL
= 0
5
A
Input Capacitance
C
IN
5
pF
DIGITAL OUTPUTS (D9AD0A, D9BD0B)
Output Voltage Low
V
OL
I
SINK
= 200A
0.2
V
Output Voltage High
V
OH
I
SOURCE
= 200A
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 Range
V
DD
2.7
3.0
3.6
V
Output Supply Voltage Range
OV
DD
1.7
2.5
3.6
V
Operating, f
INA or B
= 20MHz at -0.5dB FS
82
97
Sleep mode
2.8
mA
Analog Supply Current
I
VDD
Shutdown, clock idle, PD = OE = OV
DD
1
15
A
Operating, C
L
= 15pF , f
INA or B
= 20MHz at
-0.5dB FS
13
mA
Sleep mode
100
A
Output Supply Current
I
OVDD
Shutdown, clock idle, PD = OE = OV
DD
2
10
A
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V, OV
DD
= +2.5V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through
a 10k
resistor, V
IN
= 2V
p-p
(differential w.r.t. COM), C
L
= 10pF at digital outputs (Note 5), f
CLK
= 83.333MHz (50% duty cycle), T
A
=
T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
MAX1181
Dual 10-Bit, 80Msps, +3V, Low-Power ADC with
Internal Reference and Parallel Outputs
_______________________________________________________________________________________
5
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
0
10
15
5
20
25
30
35
40
FFT PLOT CHA (8192-POINT RECORD,
DIFFERENTIAL INPUT)
MAX1181 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
INA
= 6.0449MHz
f
INB
= 7.5099MHz
f
CLK
= 80.000568MHz
AINA = -0.46dB FS
CHA
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
0
10
15
5
20
25
30
35
40
FFT PLOT CHB (8192-POINT RECORD,
DIFFERENTIAL INPUT)
MAX1181 toc02
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
INA
= 6.0449MHz
f
INB
= 7.5099MHz
f
CLK
= 80.000568MHz
AINB = -0.52dB FS
CHB
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
0
10
15
5
20
25
30
35
40
FFT PLOT CHA (8192-POINT RECORD,
DIFFERENTIAL INPUT)
MAX1181 toc03
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
INA
= 19.9123MHz
f
INB
= 24.9123MHz
f
CLK
= 80.000568MHz
AINA = -0.52 dB FS
CHA
Typical Operating Characteristics
(V
DD
= +3V, OV
DD
= +2.5V, internal reference, differential input at -0.5dB FS, f
CLK
= 80.0005678MHz, C
L
10pF. T
A
= +25C,
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating, f
INA or B
= 20MHz at -0.5dB FS
246
291
mW
Sleep mode
8.4
Power Dissipation
PDISS
Shutdown, clock idle, PD = OE = OV
DD
3
45
W
Offset
0.2
mV/V
Power Supply Rejection
PSRR
Gain
0.1
%/V
TIMING CHARACTERISTICS
CLK Rise to Output Data Valid
t
DO
Figure 3 (Note 3)
5
8
ns
Output Enable Time
t
ENABLE
Figure 4
10
ns
Output Disable Time
t
DISABLE
Figure 4
1.5
ns
CLK Pulse Width High
t
CH
Figure 3 clock period: 12ns
6
1
ns
CLK Pulse Width Low
t
CL
Figure 3 clock period: 12ns
6
1
ns
Wakeup from sleep mode (Note 4)
0.28
Wake-Up Time
t
WAKE
Wakeup from shutdown (Note 4)
1.5
s
CHANNEL-TO-CHANNEL MATCHING
Crosstalk
f
INA or B
= 20MHz at -0.5dB FS
-70
dB
Gain Matching
f
INA or B
= 20MHz at -0.5dB FS
0.02
0.2
dB
Phase Matching
f
INA or B
= 20MHz at -0.5dB FS
0.25
degrees
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V, OV
DD
= +2.5V; 0.1F and 1.0F capacitors from REFP, REFN, and COM to GND; REFOUT connected to REFIN through
a 10k
resistor, V
IN
= 2V
p-p
(differential w.r.t. COM), C
L
= 10pF at digital outputs (Note 5), f
CLK
= 83.333MHz (50% duty cycle), 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 or better, if referenced to the two-tone envelope.
Note 3: Digital outputs settle to V
IH
, V
IL
. Parameter guaranteed by design.
Note 4: With REFIN driven externally, REFP, COM, and REFN are left floating while powered down.
Note 5: Equivalent dynamic performance is obtainable over full OV
DD
range with reduced C
L
.
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