Rainbow Electronics MAX1124 User Manual
General Description
The MAX1124 is a monolithic 10-bit, 250Msps analogto-digital converter (ADC) optimized for outstanding
dynamic performance at high IF frequencies up to
500MHz. The product operates with conversion rates of
up to 250Msps while consuming only 477mW.
At 250Msps and an input frequency of 100MHz, the
MAX1124 achieves a spurious-free dynamic range
(SFDR) of 71dBc. Its excellent signal-to-noise ratio
(SNR) of 57.1dB at 10MHz remains flat (within 1dB) for
input tones up to 500MHz. This makes the MAX1124
ideal for wideband applications such as digital predistortion in cellular base-station transceiver systems.
The MAX1124 requires a single 1.8V supply. The analog input is designed for either differential or singleended operation and can be AC- or DC-coupled. The
ADC also features a selectable on-chip divide-by-2
clock circuit, which allows the user to apply clock frequencies as high as 500MHz. This helps to reduce the
phase noise of the input clock source. A differential
LVDS sampling clock is recommended for best performance. The converter’s digital outputs are LVDS compatible, and the data format can be selected to be
either two’s complement or offset binary.
The MAX1124 is available in a 68-pin QFN with
exposed paddle (EP) and is specified over the industrial (-40°C to +85°C) temperature range.
For pin-compatible, lower speed versions of the
MAX1124, refer to the MAX1122 (170Msps) and the
MAX1123 (210Msps) data sheets. For a pin-compatible
8-bit version of the MAX1124, refer to the MAX1121
data sheet.
Applications
Wireless and Wired Broadband Communication
Cable-Head End Systems
Digital Predistortion Receivers
Communications Test Equipment
Radar and Satellite Subsystems Antenna Array
Processing
Features
♦ 250Msps Conversion Rate
♦ SNR = 56.8dB/55.5dB at fIN= 100MHz/500MHz
♦ SFDR = 71dBc/63.8dBc at f
IN
= 100MHz/500MHz
♦ NPR = 54.8dB at f
NOTCH
= 28.8MHz
♦ Single 1.8V Supply
♦ 477mW Power Dissipation at 250Msps
♦ On-Chip Track-and-Hold and Internal Reference
♦ On-Chip Selectable Divide-by-2 Clock Input
♦ LVDS Digital Outputs with Data Clock Output
♦ Evaluation Kit Available (Order MAX1124EVKIT)
MAX1124
1.8V, 10-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
________________________________________________________________ Maxim Integrated Products 1
5859606162 5455565763
38
39
40
41
42
43
44
45
46
47
AV
CC
AGND
AV
CC
TOP VIEW
AVCCOGND
OVCCORP
ORN
D9P
D9N
D8P
D8N
5253
D7P
D7N
AGND
AGND
AV
CC
CLKN
CLKP
AV
CC
AGND
OV
CC
OGND
N.C.
OV
CC
N.C.
N.C.
N.C.
D4P
D4N
OGND
OV
CC
DCLKP
DCLKN
OV
CC
D3P
D3N
D2P
35
36
37
D2N
D1P
D1N
AGND
INN
INP
AGND
AV
CC
AGND
AGND
AV
CC
AV
CC
AV
CC
AGND
REFADJ
REFIO
AGND
48 D5N
AV
CC
64
AGND
656667
AGND
AGND
AV
CC
68
T/B
2322212019 2726252418 2928 323130
D0N
D0P
3433
49
50
D6N
D5P
51 D6P
11
10
9
8
7
6
5
4
3
2
16
15
14
13
12
1
CLKDIV 17
MAX1124
EP
Pin Configuration
Ordering Information
19-3029; Rev 1; 2/04
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
MAX1124EGK -40°C to +85°C 68 QFN-EP*
*EP = Exposed paddle.
MAX1124
1.8V, 10-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
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.
AVCCto AGND ......................................................-0.3V to +2.1V
OV
CC
to OGND .....................................................-0.3V to +2.1V
AV
CC
to OVCC.......................................................-0.3V to +2.1V
AGND to OGND ....................................................-0.3V to +0.3V
Analog Inputs to AGND ...........................-0.3V to (AV
CC
+ 0.3V)
Digital Inputs to AGND.............................-0.3V to (AV
CC
+ 0.3V)
REF, REFADJ to AGND............................-0.3V to (AV
CC
+ 0.3V)
Digital Outputs to OGND.........................-0.3V to (OV
CC
+ 0.3V)
ESD on All Pins (Human Body Model).............................±2000V
Continuous Power Dissipation (TA= +70°C)
68-Pin QFN (derate 41.7mW/°C above +70°C) .........3333mW
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
Maximum Current into Any Pin............................................50mA
ELECTRICAL CHARACTERISTICS
(AVCC= OVCC= 1.8V, AGND = OGND = 0, f
SAMPLE
= 250MHz, differential sine-wave clock input drive, 0.1µF capacitor on REFIO,
internal reference, digital output pins differential R
L
= 100Ω ±1%, CL= 5pF, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥25°C guar-
anteed 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
DC ACCURACY
Resolution 10 Bits
Integral Nonlinearity INL (Note 1) -2.4
LSB
Differential Nonlinearity DNL No missing codes (Note 1) -1.0
LSB
TA ≥ +25°C -25 +25
Transfer Curve Offset V
OS
(Note 1)
(Note 2) -37 +37
LSB
Offset Temperature Drift ±20
µV/°C
ANALOG INPUTS (INP, INN)
Full-Scale Input Voltage Range V
FS
(Note 1)
mV
P-P
Full-Scale Range Temperature
Drift
130
ppm/°C
Common-Mode Input Range V
CM
V
Input Capacitance C
IN
3pF
Differential Input Resistance R
IN
4.3
kΩ
Full-Power Analog Bandwidth FPBW Figure 8 600
MHz
REFERENCE (REFIO, REFADJ)
Reference Output Voltage V
REFIO
V
Reference Temperature Drift 90
ppm/°C
REFADJ Input High Voltage
Used to disable the internal reference
AV
CC
-
0.3
V
SAMPLING CHARACTERISTICS
Maximum Sampling Rate
250
MHz
Minimum Sampling Rate
20
MHz
±0.8 +2.4
±0.5 +1.5
1100 1250 1375
V
REFADJ
f
SAMPLE
f
SAMPLE
1.38
±0.18
3.00
1.18 1.24 1.30
6.25
MAX1124
1.8V, 10-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(AVCC= OVCC= 1.8V, AGND = OGND = 0, f
SAMPLE
= 250MHz, differential sine-wave clock input drive, 0.1µF capacitor on REFIO,
internal reference, digital output pins differential R
L
= 100Ω ±1%, CL= 5pF, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥25°C guar-
anteed by production test, <25°C guaranteed by design and characterization. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS MIN
UNITS
Clock Duty Cycle Set by clock management circuit
%
Aperture Delay t
AD
350 ps
Aperture Jitter t
AJ
0.2
ps
RMS
CLOCK INPUTS (CLKP, CLKN)
Differential Clock Input Amplitude
(Note 2) 200 500
mV
P-P
Clock Input Common-Mode
Voltage Range
1.15
V
Clock Differential Input
Resistance
R
CLK
11 ±
kΩ
Clock Differential Input
Capacitance
C
CLK
5pF
DYNAMIC CHARACTERISTICS (at -0.5dBFS)
fIN = 10MHz, TA ≥ +25°C
fIN = 100MHz, TA ≥ +25°C54
fIN = 180MHz
Signal-to-Noise Ratio SNR
f
IN
= 500MHz
dB
fIN = 10MHz, TA ≥ +25°C5457
fIN = 100MHz, TA ≥ +25°C
fIN = 180MHz 56
Signal-to-Noise
and Distortion
SINAD
f
IN
= 500MHz 55
dB
fIN = 10MHz, TA ≥ +25°C
75
fIN = 100MHz, TA ≥ +25°C6271
fIN = 180MHz
Spurious-Free
Dynamic Range
SFDR
f
IN
= 500MHz
dBc
fIN = 10MHz -75
fIN = 100MHz -71
fIN = 180MHz
Worst Harmonics
(HD2 or HD3)
f
IN
= 500MHz
dBc
IMD
100
f
IN1
= 99MHz at -7dBFS,
f
IN2
= 101MHz at -7dBFS
-65
Two-Tone Intermodulation
Distortion
IMD
500
f
IN1
= 498.5MHz at -7dBFS,
f
IN2
= 502.5MHz at -7dBFS
-56
dBc
LVDS DIGITAL OUTPUTS (D0P/N–D9P/N, DCLKP/N)
Differential Output Voltage |VOD| 250 400 mV
SYMBOL
54.3 57.1
53.5 56.5
62.6
TYP MAX
40 to 60
±0.25
25%
56.8
56.3
55.5
68.3
63.8
-68.3
-63.8
MAX1124
1.8V, 10-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(AVCC= OVCC= 1.8V, AGND = OGND = 0, f
SAMPLE
= 250MHz, differential sine-wave clock input drive, 0.1µF capacitor on REFIO,
internal reference, digital output pins differential R
L
= 100Ω ±1%, CL= 5pF, TA= T
MIN
to T
MAX
, unless otherwise noted. ≥25°C guar-
anteed by production test, <25°C guaranteed by design and characterization. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS
UNITS
Output Offset Voltage OV
OS
V
LVCMOS DIGITAL INPUTS (CLKDIV, T/B)
Digital Input Voltage Low V
IL
0.2 x
V
Digital Input Voltage High V
IH
0.8 x
V
TIMING CHARACTERISTICS
CLK to Data Propagation Delay t
PDL
Figure 4 1.5 ns
CLK to DCLK Propagation Delay
t
CPDL
Figure 4
ns
Data Valid to DCLK Rising Edge
t
CPDL
-
t
PDL
Figure 4 (Note 2)
ns
LVDS Output Rise-Time t
RISE
20% to 80%, CL = 5pF
ps
LVDS Output Fall-Time t
FALL
20% to 80%, CL = 5pF
ps
Output Data Pipeline Delay
8
Clock
cycles
POWER REQUIREMENTS
Analog Supply Voltage Range AV
CC
1.7 1.8 1.9 V
Digital Supply Voltage Range OV
CC
1.7 1.8 1.9 V
Analog Supply
I
AVCCfIN
= 100MHz
mA
Digital Supply Current I
OVCCfIN
= 100MHz 45 75 mA
Analog Power Dissipation P
DISSfIN
= 100MHz
mW
Offset 1.6
mV/V
Power-Supply Rejection Ratio
(Note 3)
PSRR
Gain 1.9
%FS/V
Note 1: Static linearity and offset parameters are computed from a best-fit straight line through the code transition points. The full-
scale range is defined as 1023 x slope of the line.
Note 2: Parameter guaranteed by design and characterization; T
A
= T
MIN
to T
MAX
.
Note 3: PSRR is measured with both analog and digital supplies connected to the same potential.
SYMBOL
MIN TYP MAX
1.125 1.310
t
LATENCY
AV
CC
AV
CC
2.85
0.92 1.35 1.86
460
460
220 290
477 657
MAX1124
1.8V, 10-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
_______________________________________________________________________________________ 5
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1124 toc01
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
f
SAMPLE
= 250.0057MHz
f
IN
= 11.5054MHz
A
IN
= -0.4795dBFS
SNR = 56.5dB
SFDR = 73.5dBc
HD2 = -82.4dBc
HD3 = -73.5dBc
HD2
HD3
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1124 toc02
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
f
SAMPLE
= 250.0057MHz
f
IN
= 60.0294MHz
A
IN
= -0.4885dBFS
SNR = 56.4dB
SFDR = 74.6dBc
HD2 = -82.1dBc
HD3 = -75.6dBc
HD2
HD3
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
040608020 100 140120
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1124 toc03
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
f
SAMPLE
= 250.0057MHz
f
IN
= 183.5064MHz
A
IN
= -0.5335dBFS
SNR = 56dB
SFDR = 68.7dBc
HD2 = -78.1dBc
HD3 = -68.7dBc
HD2
HD3
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
FFT PLOT (8192-POINT DATA RECORD,
COHERENT SAMPLING)
MAX1124 toc04
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
HD3
HD2
f
SAMPLE
= 250.0057MHz
f
IN
= 500.516MHz
A
IN
= -0.5155dBFS
SNR = 55.4dB
SFDR = 64.8dBc
HD2 = -69.9dBc
HD3 = -64.8dBc
FUNDAMENTAL
SNR vs. ANALOG INPUT FREQUENCY
(f
SAMPLE
= 250.0057MHz, AIN = -0.5dBFS)
MAX1124 toc05
f
IN
(MHz)
SNR (dB)
400300200100
51
52
55
53
57
54
56
58
50
0500
SFDR vs. ANALOG INPUT FREQUENCY
(f
SAMPLE
= 250.0057MHz, AIN = -0.5dBFS)
MAX1124 toc06
f
IN
(MHz)
SFDR (dBc)
400300200100
45
50
65
55
60
35
40
70
75
80
30
0500
HD2/HD3 vs. ANALOG INPUT FREQUENCY
(f
SAMPLE
= 250.0057MHz, AIN = -0.5dBFS)
MAX1124 toc07
f
IN
(MHz)
HD2/HD3 (dBc)
400300200100
-90
-80
-70
-60
-50
-100
0500
HD2
HD3
27
37
32
52
47
42
57
62
-28 -16 -12-24 -20 -8 -4 0
SNR vs. ANALOG INPUT AMPLITUDE
(f
SAMPLE
= 250.0057MHz, fIN = 60.0294MHz)
MAX1124 toc08
ANALOG INPUT AMPLITUDE (dBFS)
SNR (dB)
40
60
50
55
45
70
65
75
80
-28 -16 -12-24 -20 -8 -4 0
SFDR vs. ANALOG INPUT AMPLITUDE
(f
SAMPLE
= 250.0057MHz, fIN = 60.0294MHz)
MAX1124 toc09
ANALOG INPUT AMPLITUDE (dBFS)
SFDR (dBc)
Typical Operating Characteristics
(AVCC= OVCC= 1.8V, AGND = OGND = 0, f
SAMPLE
= 250.0057MHz, -0.5dBFS; see TOCs for detailed information on test conditions, differential input drive, differential sine-wave clock input drive, 0.1µF capacitor on REFIO, internal reference, digital output pins
differential RL= 100Ω, TA= +25°C.)
MAX1124
1.8V, 10-Bit, 250Msps Analog-to-Digital Converter
with LVDS Outputs for Wideband Applications
6 _______________________________________________________________________________________
-90
-75
-80
-85
-60
-65
-70
-50
-55
-45
-40
-28 -16 -12-24 -20 -8 -4 0
HD2/HD3 vs. ANALOG INPUT AMPLITUDE
(f
SAMPLE
= 250.0057MHz, fIN = 60.0294MHz)
MAX1124 toc10
ANALOG INPUT AMPLITUDE (dBFS)
HD2/HD3 (dBc)
HD3
HD2
SNR vs. f
SAMPLE
(fIN = 60.0294MHz, AIN = -0.5dBFS)
MAX1124 toc11
f
SAMPLE
(MHz)
SNR (dB)
50
52
51
54
53
56
55
57
58
50
10 25017013090 210
SFDR vs. f
SAMPLE
(fIN = 60.0294MHz, AIN = -0.5dBFS)
MAX1124 toc12
f
SAMPLE
(MHz)
SFDR (dBc)
2101309050
50
60
70
80
90
40
10 250170
HD2/HD3 vs. f
SAMPLE
(fIN = 60.03294MHz, AIN = -0.5dBFS)
MAX1124 toc13
f
SAMPLE
(MHz)
HD2/HD3 (dBc)
2101701309050
-95
-85
-75
-65
-90
-80
-70
-60
-100
10 250
HD2
HD3
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
TWO-TONE IMD PLOT (8192-POINT
DATA RECORD, COHERENT SAMPLING)
MAX1124 toc14
ANALOG INPUT FREQUENCY (MHz)
AMPLITUDE (dB)
040608020 100 140120
f
SAMPLE
= 250.0057MHz
f
IN1
= 99.0317MHz
f
IN2
= 101.0459MHz
A
IN1
= A
IN2
= -7dBFS
IMD = -65dBc
2f
IN1
- f
IN2
2f
IN2
-
f
IN1
f
IN1
f
IN2
-1.0
-0.6
-0.8
-0.2
-0.4
0.2
0
0.4
0.8
0.6
1.0
256 3841280512640 768 896 1024
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1124 toc15
DIGITAL OUTPUT CODE
INL (LSB)
-0.6
-0.4
-0.2
0
0.4
0.2
0.6
256 3841280 512 640 768 896 1024
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1124 toc16
DIGITAL OUTPUT CODE
DNL (LSB)
2
0
-2
-4
-6
-8
-10
-12
10 100 1000
GAIN BANDWIDTH PLOT
(f
SAMPLE
= 250.0057MHz, AIN = -0.5dBFS)
MAX1124 toc17
ANALOG INPUT FREQUENCY (MHz)
GAIN (dB)
SNR vs. TEMPERATURE (fIN = 65.0344MHz,
f
SAMPLE
= 250.0057MHz, AIN = -0.5dBFS)
MAX1124 toc18
TEMPERATURE (°C)
SNR (dB)
603510-15
52
51
54
53
56
55
58
57
60
59
50
-40 85
Typical Operating Characteristics (continued)
(AVCC= OVCC= 1.8V, AGND = OGND = 0, f
SAMPLE
= 250.0057MHz, -0.5dBFS; see TOCs for detailed information on test conditions, differential input drive, differential sine-wave clock input drive, 0.1µF capacitor on REFIO, internal reference, digital output pins
differential RL= 100Ω, TA= +25°C.)
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