Rainbow-electronics MAX1121 User Manual

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General Description
The MAX1121 is a monolithic 8-bit, 250Msps analog-to-
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
MAX1121 achieves a spurious-free dynamic range
(SFDR) of 68dBc. Its excellent signal-to-noise ratio
(SNR) of 48.9dB at 10MHz remains flat (within 0.5dB)
for input tones up to 500MHz. This makes the MAX1121
ideal for wideband applications such as digital predis-
tortion in cellular base-station transceiver systems.
The MAX1121 requires a single 1.8V supply. The ana-
log input is designed for either differential or single-
ended 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 fre-
quencies 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 perfor-
mance. The converter’s digital outputs are LVDS com-
patible, and the data format can be selected to be
either two’s complement or offset binary.
The MAX1121 is available in a 68-pin QFN with
exposed paddle (EP) and is specified over the industri-
al (-40°C to +85°C) temperature range.
For pin-compatible, higher resolution versions of the
MAX1121, refer to the MAX1122 (170Msps), the
MAX1123 (210Msps), and the MAX1124 (250Msps)
data sheets.
Applications
Wireless and Wired Broadband Communication
Digital Oscilloscopes
Digital Predistortion Receivers
Communications Test Equipment
Radar and Satellite Subsystems Antenna Array
Processing
Instrumentation
Features
250Msps Conversion Rate
SNR = 48.8dB/48.7dB at f
IN
= 100MHz/500MHz
SFDR = 68dBc/63.8dBc at f
IN
= 100MHz/500MHz
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)
MAX1121
1.8V, 8-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
AV
CC
OGND
OV
CC
ORP
ORN
D7P
D7N
D6P
D6N
5253
D5P
D5N
AGND
AGND
AV
CC
CLKN
CLKP
AV
CC
AGND
OV
CC
OGND
N.C.
OV
CC
N.C.
N.C.
N.C.
D2P
D2N
OGND
OV
CC
DCLKP
DCLKN
OV
CC
D1P
D1N
D0P
35
36
37
D0N
N.C.
N.C.
AGND
INN
INP
AGND
AV
CC
AGND
AGND
AV
CC
AV
CC
AV
CC
AGND
REFADJ
REFIO
AGND
48 D3N
AV
CC
64
AGND
656667
AGND
AGND
AV
CC
68
T/B
2322212019 2726252418 2928 323130
N.C.
N.C.
3433
49
50
D4N
D3P
51 D4P
11
10
9
8
7
6
5
4
3
2
16
15
14
13
12
1
CLKDIV 17
MAX1121
EP
Pin Configuration
Ordering Information
19-3077; 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
MAX1121EGK -40°C to +85°C 68 QFN-EP*
*EP = Exposed paddle.
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Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX1121 is a monolithic 8-bit, 250Msps analog-to-digital converter (ADC) optimized for outstandingdynamic performance at high I

Page 2 - ELECTRICAL CHARACTERISTICS

MAX1121Detailed Description— Theory of OperationThe MAX1121 uses a fully differential, pipelined archi-tecture that allows for high-speed conversion,

Page 3

and are usually driven in AC-coupled configuration.See the Differential, AC-Coupled Clock Input in theApplications Information section for more circui

Page 4

MAX1121Divide-by-2 Clock Control (CLKDIV)The MAX1121 offers a clock control line (CLKDIV),which supports the reduction of clock jitter in a system.Con

Page 5

Applications InformationFull-Scale Range Adjustments Using theInternal Bandgap ReferenceThe MAX1121 supports a full-scale adjustment range of10% (±5%)

Page 6

MAX1121Differential, AC-Coupled Analog InputAn RF transformer provides an excellent solution toconvert a single-ended source signal to a fully differe

Page 7

Multilayer boards with separated ground and powerplanes produce the highest level of signal integrity.Consider the use of a split ground plane arrange

Page 8 - Pin Description

MAX1121Static Parameter DefinitionsIntegral Nonlinearity (INL)Integral nonlinearity is the deviation of the values on anactual transfer function from

Page 9 - Pin Description (continued)

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband ApplicationsMaxim cannot assume responsibility for use of any ci

Page 10 - Theory of Operation

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications2 __________________________________________________

Page 11 - Clock Outputs (DCLKP, DCLKN)

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications____________________________________________________

Page 12 - System Timing Requirements

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications4 __________________________________________________

Page 13 - Applications Information

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications____________________________________________________

Page 14 - Layout Considerations

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications6 __________________________________________________

Page 15

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications____________________________________________________

Page 16 - Resolution Versions

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications8 __________________________________________________

Page 17 - Package Information

MAX11211.8V, 8-Bit, 250Msps Analog-to-Digital Converterwith LVDS Outputs for Wideband Applications____________________________________________________

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